ISO Standard Charts for Engineering Fasteners & Components.
Fastener ISO Standards are globally recognised guidelines developed by the International Organisation for Standardisation to ensure the safety, reliability and interchangeability of mechanical components. Engineers and manufacturers depend on ISO standards to deliver consistent performance across global supply chains. By adhering to ISO requirements, components from different suppliers can fit and function together seamlessly, reducing the risk of failure in high-stress environments.
Our helpful ISO reference tables contain at-a-glance information on the why, what and how these codes impact and relate to the performance and suitability of your components.
Note: This page contains multiple large tables, we strongly advise using the quick navigation links to find what you are looking for!
Quick Navigation:
- Hexagon Head Products (Hex Bolts & Screws).
- Hex Socket (Allen) Head Bolts & Screws.
- Machine Screws (Slotted, Cross-Recess, Torx, Pozi, Phillips).
- Nuts (Hex, Wing, Flange).
- Washers (Helical, Square, Conical).
- Set Screws (Grub Screws).
- Pins, Circlips and Other Retaining Products.
- Rivets (Blind,Structural, Drive).
- Thread Forms & Tolerances.
- Fastener Mechanical & Material Properties.
- Fastener Surface Treatments & Coatings ISO Codes.
- Springs, O‑Rings, Bearings and Linear Systems.
- Quality, Environmental & Management System Standards.
Hexagon Head Products (Hex Bolts & Screws).
|
ISO Standard |
Title / Description |
Typical Product(s) |
Mechanical / Dimensional Scope |
Application Environment / Use Case |
|
ISO 4014 Partial Thread 2022 |
Hex bolts with shank (partial thread); product grades from A & B with lengths of M1 to M64. |
Metric Standard hex bolts |
Metric threads, partial threading, defined head and shank dimensions |
General engineering, automotive assemblies |
|
ISO 4017 |
Hex screws (fully threaded) |
Metric threads, full threading, grades typically 8.8–12.9 |
General assembly, machinery frames, structural joints |
|
|
ISO 4018 |
Hex screws, older version (dimensions similar to ISO 4017) |
Coarse thread, non-preferred standard, full threading |
Legacy equipment, interchangeable with ISO 4017 |
|
|
ISO 8765 |
Hex head screws with metric fine pitch threads |
Fine thread pitch, improved vibration resistance |
Automotive, aerospace, vibration-prone assemblies |
|
|
ISO 8676 |
Hex socket head screws with metric fine pitch threads |
Internal hex drive, fine pitch, tight tolerance fit |
Aerospace, instrumentation, fine assembly tolerances |
|
|
ISO 4162 |
Hex head screws – fully threaded, with specific mechanical requirements |
Variant of hex screws with specs included |
Includes defined mechanical class, full thread length |
Machinery, high-stress applications needing full engagement |
|
ISO 4775 |
Hex bolts with metric fine pitch threads (less common) |
Fine Pitch Full Thread Hexagon Bolts (Similar to 8765) |
Fine pitch external thread, partial shank |
Precision bolting, specialist engineering |
|
ISO 15071 |
Hex bolts for high-strength structural bolting (large diameters) |
High tensile grades, large diameter, designed for preloading |
Bridges, steel frameworks, critical load-bearing structures |
Note: Always check the product specification sheet for component suitability prior to purchase.
Hexagon Head Products - ISO Answers.
Q: What is the difference between ISO 4014 and ISO 4017?
A: ISO 4014 defines partially threaded hex bolts, while ISO 4017 specifies fully threaded hex screws. Both share similar head geometry and thread profiles but differ in shank length. ISO 4014 bolts are better for shear applications; ISO 4017 screws suit full-thread engagement.
Q: Are ISO 4017 and ISO 4018 bolts interchangeable?
A: ISO 4018 is an older, coarse-threaded variant similar to ISO 4017, but it is a non-preferred standard. While dimensions are close, they are not fully interchangeable in high-spec environments.
Q: Are there ISO standards for coarse & fine thread bolts?
A: Yes. ISO 4014, 4017, and 4018 are coarse thread types, while ISO 8765, 8676, and 4775 define fine thread variants. Fine threads offer better vibration resistance but are more prone to damage during installation.
Hex Socket (Allen) Head Bolts & Screws.
|
ISO Standard |
Title / Description |
Typical Product(s) |
Mechanical / Dimensional Scope |
Application Environment / Use Case |
|
ISO 4762 |
Hexagon socket head cap screws (cylindrical head) |
Cylindrical head, deep internal hex socket, high tensile strength |
Machinery, robotics, tooling—requires flush surface and torque |
|
|
ISO 10642 |
Hexagon socket countersunk head screws |
Flat head with internal hex, angled under-head for flush mounting |
Panels, electronics, where a smooth surface finish is necessary |
|
|
ISO 7380‑1 |
Button head socket screws (standard head) |
Rounded low-profile head, internal hex socket, moderate tensile properties |
Consumer products, light-duty frames, aesthetic finishes |
|
|
ISO 7380‑2 |
Button head socket screws (reduced head – “low head”) |
Lower head height than standard, reduced load-bearing capacity |
Tight clearance or aesthetic design spaces |
|
|
ISO 14579 |
Torx Socket pan head screws (Hexoglobular) |
Rounded top, larger bearing surface than button heads |
Electrical casings, enclosures, sheet metal assemblies |
|
|
ISO 14580 |
Torx/Hex socket cheese head screws (cylindrical cheese head with hex drive) |
Metric Socket Cheese Head Screws |
Tall cylindrical head, deep hex socket, narrow footprint |
Lab equipment, precise torque control in limited width designs |
|
ISO 14583 |
Hexalobular socket pan head screws (Torx drive, pan head) |
Torx drive (6-lobe), pan-style head, improved cam-out resistance |
Electronics, automotive interiors, tamper-resistant assemblies |
|
|
ISO 14584 |
Hexalobular socket countersunk head screws (Torx drive, countersunk) |
Torx drive, countersunk head with clean surface finish |
Electronic device frames, aesthetic panels |
|
|
ISO 14582 |
Hex socket countersunk screws with small head diameter (specialised use) |
Reduced head diameter for minimal visibility or tight countersinking |
Aerospace, fine assemblies, space-limited fastenings |
Note: Torx‑based screws sometimes also reference “ISO 10664” for the drive type.
Hex Socket Head Screws & Bolts - ISO Answers.
Q: What is the ISO standard for Torx socket screws?
A: ISO 14579, 14583, 14584, and 14582 define different Torx socket screws (also known as hexalobular). These improve torque transfer and reduce cam-out, often used in electronics, enclosures, and tamper-resistant designs.
Q: Are ISO 4762 screws stronger than ISO 7380 screws?
A: Yes. ISO 4762 screws typically come in high tensile grades (e.g. 12.9), and their deeper internal socket allows greater tightening torque. ISO 7380 button heads are lower profile and less suited to high-stress environments.
Q: Are ISO socket screws interchangeable with DIN standards?
A: Many ISO screws were derived from DIN standards for example ISO 4762 is equivalent to DIN 912. However, ISO may differ in tolerances or dimensional updates to the standard, so always check the specification for your project.
Machine Screws (Slotted, Cross-Recess, Torx, Pozi, Phillips).
|
ISO Standard |
Title / Description |
Typical Product(s) |
Mechanical / Dimensional Scope |
Application Environment / Use Case |
|
ISO 1207 |
Slotted cheese head screws |
Cylindrical head, flat top, slotted drive |
Legacy equipment, general use where torque demands are minimal |
|
|
ISO 1580 |
Slotted pan head screws |
Wide head diameter, slotted recess, low-profile design |
Electronics casings, basic mechanical assemblies |
|
|
ISO 7045 |
Pan head screws with cross recess (Phillips or Pozidriv) |
ISO metric thread, cross recess, domed top |
General-purpose fastening in consumer and industrial products |
|
|
ISO 7046 |
Countersunk head screws with cross recess |
Flat countersunk head with cross recess (PZ/PH types) |
Flush-fit applications, light-duty structural joints |
|
|
ISO 7047 |
Raised countersunk head screws with cross recess |
Oval head combining aesthetic curve with countersink fit |
Decorative finishes, interior hardware, control panels |
|
|
ISO 14581 |
Hexoglobular countersunk head (variant of ISO 10642 with specific head geometry) |
6-lobe drive, Flatter or steeper countersink angle than ISO 10642 |
Mechanical systems requiring flush finish and high torque |
|
|
ISO 14583 |
Pan head screws with hexalobular (Torx) recess |
6-lobe drive, rounded pan head, higher torque capacity |
Automotive trim, electronics, tamper-resistant applications |
|
|
ISO 1481 |
Tapping screws with slotted countersunk head |
Slotted head, sharp threads, designed to cut own mating thread |
Sheet metal, timber, light-duty industrial fixings |
|
|
ISO 1482 |
Tapping screws with slotted pan head |
Wide pan head with slot, coarse thread |
Panel mounting, consumer electronics, light construction |
|
|
ISO 2702 |
Heat-treated steel tapping screws |
Hardened Steel Self-Tapping Screws |
Hardened steel body, self-forming thread, increased tensile and shear strength |
High-strength sheet metal joints, machinery frames |
|
ISO 7049 |
Cross recessed tapping screws (pan head) |
Cross recess, sharp threading, designed for forming internal threads during use |
Plastics, sheet metal, quick assembly production lines |
|
|
ISO 7050 |
Cross recessed tapping screws (countersunk head) |
Flat countersunk head, cross recess, designed for clean flush mounting |
Domestic appliances, control panels, enclosures |
Note: Always check the product specification sheet for component suitability prior to purchase.
Machine Screws - ISO Answers.
Q: What is ISO 14583 and where is it applied?
A: ISO 14583 specifies hexalobular (Torx) socket pan head screws with thread sizes from M2 to M10. These screws offer improved torque transmission and reduced cam-out, making them ideal for electronics and automotive applications.
Q: Are ISO 2009 screws interchangeable with DIN 963?
A: ISO 2009 has largely replaced DIN 963. While dimensions are similar, ISO 2009 includes updated tolerances and specifications. It's advisable to verify compatibility in critical applications.
Q: How does ISO 14583 differ from ISO 14584?
A: While ISO 14583 defines pan head screws, ISO 14584 specifies countersunk head screws, both with hexalobular (Torx) drives. The choice depends on whether a flush surface (ISO 14584) or a protruding head (ISO 14583) is desired.
Nuts (Hex, Wing, Flange).
|
ISO Standard |
Title / Description |
Typical Product(s) |
Mechanical / Dimensional Scope |
Application Environment / Use Case |
|
ISO 4032 |
Hex nuts – Style 1 (standard height) |
Standard height, coarse thread, commonly available in grades 8, 10, and 12 (A2/A4) |
General engineering, machinery, equipment fastening |
|
|
ISO 4033 |
Hex nuts – Style 2 (taller form) 6.5mm or greater thickness. |
Taller profile than ISO 4032, increased thread engagement |
High-strength applications requiring greater clamping force |
|
|
ISO 4034 |
Hex nuts – Low type |
Lower profile, reduced thread depth |
Low-clearance or aesthetic assemblies, light-duty applications |
|
|
ISO 4161 |
Hex jam nuts (thin type) |
Thin form, used for secondary locking |
Locking assemblies, paired with a standard nut to prevent loosening |
|
|
ISO 7042 |
Hex nuts with all-metal prevailing torque feature |
Distorted threads or top locking element, no plastic insert |
High-temperature or vibration-prone settings |
|
|
ISO 10511 |
Hex nuts with non-metallic insert (nylon) |
Plastic ring deforms on installation to resist loosening |
Consumer products, automotive, moderate temperature zones |
|
|
ISO 10512 |
Hex flange nuts with non-metallic insert lock |
Non-Serrated Flanged Nylon Locking Nuts. |
Flanged base for load distribution, nylon locking ring |
Assembly lines, soft materials, vibration resistance |
|
ISO 2320 |
Prevailing torque steel nuts – Mechanical and performance requirements |
Defines testing requirements for torque retention and reuse |
Quality assurance and specification reference for torque-type nuts |
|
|
ISO 7719 |
Wing nuts (several forms exist, but less commonly stocked) |
Designed for hand tightening, winged sides |
Tool-less applications, furniture, light-duty hardware |
|
|
ISO 7043/7044 |
Hex nuts with flange (all-metal locking, various heights) |
Integrated flange, metal locking features, height variations |
Structural bolting, automotive, where flange aids load spread |
Note: Always check the product specification sheet for component suitability prior to purchase.
Engineering Nut Standards - ISO Answers.
Q: What is the difference between ISO 4032 and ISO 4033 nuts?
A: ISO 4032 defines standard height hex nuts (Style 1) used in most general engineering applications. For example, an M10 ISO 4032 nut has a typical height of 8.4mm. ISO 4033 defines taller hex nuts (Style 2), offering greater thread engagement and higher clamping force for demanding assemblies. The same M10 size under ISO 4033 has a minimum height of 10mm, providing around 20% more height and thus thread engagement.
Q: Can I replace ISO 4032 nuts with DIN equivalents?
A: ISO 4032 replaced DIN 934, and they are functionally interchangeable in most cases. However, for critical or certified applications, always refer to the current ISO specification.
Q: What’s the difference between ISO 7042 and ISO 10511 locking nuts?
A: ISO 7042 nuts use an all-metal locking design, suitable for high temperatures and reuse. ISO 10511 uses a non-metallic nylon insert, ideal for moderate temperatures and single-use locking.
Washers (Helical, Square, Conical).
|
ISO Standard |
Title / Description |
Typical Product(s) |
Mechanical / Dimensional Scope |
Application Environment / Use Case |
|
ISO 7089 |
Plain washers, Normal series (formerly DIN 125-A) |
Standard OD and ID, flat profile, no chamfer |
General engineering, load distribution beneath nuts and bolts |
|
|
ISO 7090 |
Plain washers, Normal series, chamfered (formerly DIN 125-B) |
Similar to ISO 7089, with chamfer on hole edge for improved contact with fasteners |
Precision assemblies, where chamfer helps centring or clearance |
|
|
ISO 7091 |
Plain washers, Normal series |
Lower dimensional accuracy, often used in structural or non-critical applications |
Heavy machinery, large-scale infrastructure |
|
|
ISO 7092 |
Plain washers, Small series |
Smaller outside diameter for tight spaces |
Compact assemblies, electronics, reduced footprint applications |
|
|
ISO 7093 |
Plain washers, Large series |
Larger outside diameter than ISO 7089, more surface coverage |
Distributing loads on soft or thin materials |
|
|
ISO 7094 |
Plain washers, Extra-large series |
Significantly increased OD, suitable for covering oversized holes |
Timber framing, soft substrates, oversized hole compensation |
|
|
ISO 8738 |
Square washers |
Square outer profile, often with round hole |
Structural steel, anchor plates, masonry applications |
|
|
ISO 10673 |
Conical spring washers (Belleville washers/Springs) for general engineering applications |
Conical shape, creates axial preload when compressed |
Vibration damping, dynamic assemblies, electrical contact setups |
|
|
ISO 10510 |
Helical spring lock washers (single coil) |
Spiral shape, moderate locking action via tension |
Anti-loosening in light-duty vibration-prone environments |
|
|
ISO 10511 |
Helical spring lock washers – heavy series |
Thicker cross-section, higher preload and locking torque |
Industrial equipment, railway, heavy vibration and shock |
Note: Wave washers and circlips frequently still reference DIN/EN standards (e.g. DIN 137, DIN 6796, DIN 471/472). Some have ISO equivalents, but they are less commonly cited commercially.
Engineering Washers - ISO Answers.
Q: What is the difference between ISO 7089 and ISO 7090 flat washers?
A: ISO 7089 defines standard flat washers (Form A) with no chamfer, used for general load distribution. ISO 7090 adds a chamfered hole edge for better seating on high-precision fasteners, commonly used in tighter tolerance assemblies.
Q: What’s the benefit of using an ISO 7093 or ISO 7094 washer?
A: ISO 7093 and ISO 7094 provide larger outer diameters to spread load more effectively. ISO 7094 washers are the extra-large series, ideal for timber or oversized hole compensation.
Q: What is the difference between ISO 10510 and ISO 10511 spring washers?
A: ISO 10511 washers are the heavy-duty version of ISO 10510, with a thicker cross-section. They deliver more preload and are suitable for heavy vibration conditions like railways or industrial machinery.
Set Screws (Grub Screws).
|
ISO Standard |
Title / Description |
Typical Product(s) |
Mechanical / Dimensional Scope |
Application Environment / Use Case |
|
ISO 4026 |
Hex socket set screws with flat point |
Flat end, internal hex drive, no surface penetration |
Temporary fixings, shaft collars, light-pressure positioning |
|
|
ISO 4027 |
Hex socket set screws with cone point |
Sharp cone tip, concentrates pressure at a point |
Permanent fixation, anti-rotation in soft shafts or materials |
|
|
ISO 4028 |
Hex socket set screws with dog point |
Cylindrical tip (unthreaded), aligns into pre-drilled hole |
Precision alignment, axial locking in shafts |
|
|
ISO 4029 |
Hex socket set screws with cup point |
Hollowed-out tip for edge biting, widely used form |
General-purpose securing, moderate holding power |
|
|
ISO 4766 |
Slotted set screws with flat point |
Flat point, slot drive, typically low-profile |
Simple or legacy assemblies, light-duty fastenings |
Note: Always check the product specification sheet for component suitability prior to purchase.
Set/Grub Screws - ISO Answers.
Q: What is the difference between ISO 4026 and ISO 4029 set screws?
A: ISO 4026 defines flat point set screws, which rest against surfaces without digging in,ideal for temporary or light-pressure fixings whereas ISO 4029 defines cup point set screws, the most common type, featuring a concave tip that bites into the surface for better holding power.
Q: What tool is used for ISO 4766 slotted set screws?
A: ISO 4766 screws use a flat-head screwdriver due to the slotted drive. They’re easier to strip and less torque-resistant than hex socket versions.
Q: Can ISO Set/Grub screws be used in high-vibration environments?
A: Yes, particularly ISO 4027 (cone point) and ISO 4029 (cup point) types. For even better vibration resistance, use in conjunction with thread-locking compounds or locking inserts.
Pins, Circlips and Other Retaining Products.
|
ISO Standard |
Title / Description |
Typical Product(s) |
Mechanical / Dimensional Scope |
Application Environment / Use Case |
|
ISO 2338 |
Parallel pins, hardened/unhardened |
Cylindrical, chamfered ends, optional hardness grades |
General alignment in engineering assemblies |
|
|
ISO 8733 |
Parallel pins with internal thread or tapped hole |
Tapped axial hole allows extraction with a screw |
Removable alignment, high-precision or serviceable assemblies |
|
|
ISO 8734 |
Dowel pins, hardened and ground |
Tight tolerance, hardened steel, precise alignment control |
Tooling, machinery, critical registration points |
|
|
ISO 8750 |
Spring-type straight pins (slotted spring pins) |
Hollow pin with axial slot for compression |
Moderate retention, shock absorption, self-locking properties |
|
|
ISO 8752 |
Coiled spring pins |
Coiled steel layers, better fatigue resistance and flexibility |
Automotive, mechanical linkages, cyclic loading environments |
|
|
ISO 13337 |
Taper pins, metric |
Gradual taper, used with matching tapered holes |
Semi-permanent locking, pulleys, collars, precision assemblies |
|
|
ISO 8749 |
Grooved pins (grooves along diameter for retention) |
Full Length Taper Grooved Pins. |
Axial grooves allow pin to deform for press-fit retention |
Positioning or locking in thin-walled or soft materials |
|
ISO 464 |
Split pins (cotter pins) |
Bent wire design, used to secure slotted nuts or shafts |
Securing castle nuts, clevis pins, traditional locking methods |
|
|
ISO 1234 |
Split pins, form B (variation of design) |
Another form of cotter pin (custom spec) |
Similar function with slight variation in end shape or leg design |
Alternate design for regional or industry-specific fitment |
Note: Most circlips in the market are still labeled by DIN 471 (external) or DIN 472 (internal). The ISO equivalents exist but see less daily usage in some industries, Be sure to check your components for any of these codes or ask our customer agents for help!
Pins, Circlips and Retaining Products - ISO Answers.
Q: What is the difference between ISO 2338 and ISO 8734 Dowel Pins?
A: ISO 2338 defines standard cylindrical pins that can be either hardened or unhardened, used for general positioning. ISO 8734 specifies precision hardened and ground dowel pins with tighter tolerances, suited for tooling and high-accuracy alignment.
Q: How do ISO 8750 and ISO 8752 spring pins differ?
A: ISO 8750 covers slotted spring pins with a single axial slot. ISO 8752 defines coiled spring pins, made from layered coils of steel, offering better fatigue resistance and higher flexibility under cyclic loading.
Q: Which ISO pin is best for removable alignment in machinery?
A: ISO 8733 pins are ideal, they offer precise alignment with the added benefit of a tapped hole, making them easy to extract for maintenance or disassembly.
Rivets (Blind,Structural, Drive).
|
ISO Standard |
Title / Description |
Typical Product(s) |
Mechanical / Dimensional Scope |
Application Environment / Use Case |
|
ISO 15977 |
Blind rivets – General requirements |
Defines dimensions, head types, materials, and basic installation requirements |
Sheet metal, enclosures, consumer electronics |
|
|
ISO 14589 |
Blind rivets – Mechanical testing / acceptance |
Blind rivet performance spec (Non-Product Specific) |
Specifies tensile, shear, and mandrel retention testing procedures |
Quality-controlled or safety-critical installations |
|
ISO 16582 |
Structural blind rivets (heavy-duty, load-bearing) |
Larger diameters, increased shear/tensile strength, often with locking mandrel design |
Automotive, HVAC, heavy equipment, load-bearing blind joints |
|
|
ISO 8735 |
Drive rivets (special type of rivets with drive pin) |
Solid rivet body with protruding pin driven to expand body into hole |
Signage, light-duty structural fixes, tamper-resistant assemblies |
Note: Always check the product specification sheet for component suitability prior to purchase.
Rivets (Blind/Dome/Structural) - ISO Answers.
Q: How does ISO 14589 differ from ISO 15977?
A: ISO 14589 does not define rivet geometry, it sets mechanical testing standards for blind rivets. This includes tensile strength, shear strength, and mandrel retention tests, critical for quality-controlled or load-bearing applications.
Q: Are ISO rivets compatible with standard blind rivet guns?
A: Yes. Rivets specified under ISO 15977 and ISO 16582 are designed for manual and pneumatic rivet tools using standard mandrel pulling mechanisms.
Q: Are drive rivets vibration-resistant?
A: ISO 8735 drive rivets offer basic retention, but they’re not designed for high-vibration applications. For such conditions, use ISO 16582 structural rivets or locking bolts.
Thread Forms & Tolerances.
This table refers to ISO codes describing specific metric thread profiles, for a detailed overview and a helpful downloadable chart on this topic see our help page here.
If you're looking for specific thread tolerance data check out our helpful visual guide here.
|
ISO Standard |
Title / Description |
Scope / Relevance |
Mechanical / Dimensional Scope |
Application Environment / Use Case |
|
ISO 68 |
Basic profiles for screw threads – Metric series |
Core geometry of the thread |
Defines the V-profile, thread angle (60°), crest/root shape of ISO metric threads |
Foundational reference for all ISO metric screw thread forms |
|
ISO 261 |
General purpose metric screw threads – General plan |
Preferred diameters & pitches |
Establishes standard combinations of diameters and pitch used in manufacturing |
Baseline for selecting thread types in general engineering |
|
ISO 724 |
Metric threads – Basic dimensions |
Specifies fundamental dimension references |
Determines nominal diameter, pitch diameter, minor diameter for external/internal threads |
Reference for calculating thread depth and fit tolerance |
|
ISO 965 (series) |
Metric screw threads – Tolerances (Parts 1–5) |
Defines thread tolerance classes (6g, 6H, etc.) |
Covers pitch, flank, and major/minor diameter tolerances for thread fit |
Controls thread fit and interchangeability in precision components |
|
ISO 262 |
Selected screw thread sizes for general-purpose metric screws |
Standard “preferred” size list |
Subset of ISO 261, provides commonly used combinations |
Efficient inventory and manufacturing practices |
|
ISO 965‑4 |
Limits of sizes for hot-dip galvanized external threads (coarse series) |
For galvanized, thicker coatings |
Adjusted tolerance ranges to compensate for thick coating layers |
Construction, outdoor, or corrosive environments where HDG is applied |
Note: While not referencing any individual products, these ISO codes are included for materials/other reference when seleting your components.
Fastener Mechanical & Material Properties.
|
ISO Standard |
Title / Description |
Scope / Relevance |
Mechanical / Dimensional Scope |
Application Environment / Use Case |
|
ISO 898‑1 |
Mechanical properties of fasteners made of carbon steel and alloy steel – Bolts/screws/studs |
Defines property classes (4.6, 8.8, 10.9, 12.9, etc.) |
Specifies tensile strength, proof load, elongation, and hardness for bolts and screws |
High-stress joints, structural assemblies, safety-critical bolting |
|
ISO 898‑2 |
Nuts made of carbon steel or alloy steel – Mechanical properties |
Defines property classes for nuts (Grades 5, 8, 10, 12) |
Establishes minimum proof load values and compatibility with ISO 898‑1 bolts |
Engineering and automotive applications requiring matched strength |
|
ISO 898‑5 |
Set screws and other threaded fasteners not under tensile stress |
Mechanical properties for set screws |
Torsional strength, hardness limits for non-load-bearing threaded fasteners |
Grub screw applications, locking components |
|
ISO 3506 (series) |
Mechanical properties of corrosion-resistant stainless steel fasteners (A1, A2, A4, etc.) |
Includes property classes 50, 70, 80, 100 for stainless steels |
Defines strength and corrosion resistance levels for stainless bolts, nuts, screws |
Marine, medical, and food-safe engineering environments |
|
ISO 2702 |
Heat-treated steel tapping screws |
Hardness, torque requirements |
Covers torsional strength, surface hardness, and drive performance for self-tapping screws |
Sheet metal and frame construction with enhanced thread formation |
|
ISO 3269 |
Fasteners – Acceptance inspection |
Sampling and inspection requirements |
Outlines lot-based acceptance levels, defect criteria, and quality assurance steps |
Quality-controlled manufacturing and sourcing |
|
ISO 6157 (series) |
Fasteners – Surface discontinuities for bolts, screws, studs & nuts |
Defines permissible surface flaws |
Specifies limits for cracks, seams, laps, inclusions, and burrs |
Used in visual and microscopic inspection stages |
Note: While not referencing any individual products, these ISO codes are included for materials/other reference when seleting your components.
Fastener Surface Treatments & Coatings.
|
ISO Standard |
Title / Description |
Scope / Relevance |
Mechanical / Dimensional Scope |
Application Environment / Use Case |
|
ISO 4042 |
Fasteners – Electroplated coatings |
Requirements for electroplating thickness, hydrogen embrittlement, etc. |
Specifies coating thickness, adhesion, corrosion resistance, hydrogen embrittlement prevention |
Automotive, aerospace, and structural fasteners with plated finishes |
|
ISO 10683 |
Fasteners – Non-electrolytically applied zinc flake coatings |
Zinc flake (e.g. Geomet®, Dacromet®) for corrosion resistance |
Defines performance of non-electrolytic coatings with low risk of hydrogen embrittlement |
Marine, offshore, and heavy-duty industries needing high corrosion protection |
|
ISO 1456 |
Metallic coatings – Electroplated coatings of nickel, chromium |
Broad plating standard for nickel/chrome finishes |
Thickness, adhesion, appearance, and corrosion resistance of decorative or functional coatings |
Decorative metal components, consumer goods, medical instruments |
|
ISO 2081 |
Metallic coatings – Electroplated zinc coatings with passivation |
Another zinc plating reference for specified application methods |
Covers zinc thickness, clear/yellow passivation, corrosion test performance |
General-use fasteners, automotive, appliances requiring bright or corrosion-resistant finishes |
Note: While not referencing any individual products, these ISO codes are included for materials/other reference when seleting your components.
Springs, O‑Rings, Bearings and Linear Systems.
While not always under the same ISO families as fasteners, these related component ISO codes are useful to have on hand when working on your projects, helping you decide quickly which components are project compliant.
Springs.
|
ISO Standard |
Title / Description |
Scope / Relevance |
Mechanical / Dimensional Scope |
Application Environment / Use Case |
|
ISO 2162 (series) |
Technical drawings – Springs (compression springs, etc.) |
Design/measurement guidance for spring parameters |
Covers measurement symbols, tolerances, and representation in technical drawings |
Custom spring design, CAD specifications, technical drawings |
O‑Rings.
|
ISO Standard |
Title / Description |
Scope / Relevance |
Mechanical / Dimensional Scope |
Application Environment / Use Case |
|
ISO 3601 |
Fluid power systems – O-rings |
Standard sizes, tolerances, cross-section specs |
Specifies inside diameter, cross-sectional dimensions, and precision classes |
Hydraulic/pneumatic sealing, mechanical sealing applications |
|
ISO 4633 |
Rubber seals for water supply, drainage, sewerage pipelines |
Larger diameter sealing systems (non-engineering use) |
Focused on pipe sealing, includes shape tolerances and elastomeric performance |
Civil engineering, water infrastructure |
Bearings.
|
ISO Standard |
Title / Description |
Scope / Relevance |
Mechanical / Dimensional Scope |
Application Environment / Use Case |
|
ISO 15 |
Rolling bearings – Boundary dimensions |
Outer diameter, width, bore dimensions for bearings |
Defines fitting dimensions for ball, roller, and needle bearings |
Bearing selection and housing design |
|
ISO 281 |
Rolling bearings – Dynamic load ratings, rating life |
Calculating bearing life under dynamic load |
Provides L10 life formulas and load rating equations |
Predicting service life, load planning |
|
ISO 5753 |
Rolling bearings – Radial internal clearances |
Defines play between rolling elements and raceways |
Specifies radial clearance classes (C2 to C5) |
Vibration control, thermal expansion allowance |
|
ISO 76 |
Rolling bearings – Static load ratings |
Resistance to deformation under static load |
Limits for permanent deformation under load |
Non-rotating or slow-starting machinery |
|
ISO 3290 |
Rolling bearings – Balls |
Standardises ball sizes and grades for ball bearings |
Specifies diameter tolerances, surface finish, roundness |
Used in ball bearing manufacturing or repair |
Linear Motion & Machine Elements.
|
ISO Standard |
Title / Description |
Scope / Relevance |
Mechanical / Dimensional Scope |
Application Environment / Use Case |
|
ISO 3408 |
Ball screws |
Accuracy classes, lead error, dimensional standards |
Defines tolerances, preload classes, axial/lateral play limits |
CNC machinery, automation, robotics |
|
ISO 12090 |
Needle roller bearings |
Size, load capacity, structural properties |
Details dimensions, clearance, rolling element properties |
High-load, compact rotational components |
Quality, Environmental & Management System Standards.
Manufacturers typically hold these certifications at the organizational level rather than referencing them for a single product; however it is worth ensuring that your fasteners come from a reputable retailer supplying certificates of conformity (C of C) like Accu!
|
ISO Standard |
Title / Description |
System Coverage / Certification Scope |
Application Environment / Use Case |
|
ISO 9001 |
Quality Management Systems – Requirements |
Specifies framework for consistent product/service quality, continual improvement |
Manufacturing, supply chains, and product reliability assurance |
|
ISO 14001 |
Environmental Management Systems |
Focuses on environmental aspects, compliance, pollution prevention, and resource use |
Operations involving materials, emissions, or waste generation |
|
ISO 45001 |
Occupational Health & Safety Management Systems |
Establishes policies and controls for health, safety, and risk reduction |
Engineering workshops, production lines, facilities management |
|
ISO/IEC 17025 |
Competence of Testing and Calibration Laboratories |
Assesses technical competence, test method validity, and lab management |
Calibration, materials testing, quality validation laboratories |
|
ISO 50001 |
Energy Management Systems |
Enables systematic energy performance improvements and cost savings |
Facilities with high power usage, energy audits, sustainable design |
Note: While not referencing any individual products, these ISO codes are included for materials/other reference when seleting your components.
Terminology and Generic Fastener Engineering ISO Standards.
Think of this section as the dictionary and rulebook of the fastener world. ISO 1891 gives us the language - like what to call that hex head or countersunk drive, while ISO 8991 sets the ground rules behind the for the components physical properties- helping keep everything in spec.
- ISO 1891: Fasteners – Terminology
A fundamental vocabulary standard for describing fasteners and their elements (heads, drives, etc.). - ISO 8991: Fasteners – General requirements for bolts, screws, studs and nuts
Overarching specification that references many dimensional and mechanical property standards. Not usually seen on individual fasteners, rather a general manufacturing standard.
Key Take Aways:
Not All ISO Codes Are Equally Common
Many of these standards are overshadowed in everyday use by the most universal references (ISO 4762 for socket caps, ISO 4032 for nuts, ISO 7089 for washers, etc.).
It is worth keeping this in mind when selecting components as you may need to check product spec sheets for the full picture on a parts ISO compliance or check for an alternate DIN/EN Code.
Still confused about what component best fits your needs?
Not to worry Accu will happily help you select the perfect components for your project.
ISO vs DIN: Why It Matters and When to Choose.
Ever wonder why some bolts look nearly identical but just won’t quite fit? That’s the ISO vs DIN dilemma. ISO standards are the global gold standard, designed for universal compatibility and adopted pretty much everywhere. DIN, on the other hand, is the German original and is still widely used across Europe and in older specs.
The differences might seem tiny but in precision assemblies, tiny matters. If you’re sourcing internationally or building to modern spec sheets, go ISO.
Working with legacy machinery or European tooling? DIN might still be the right fit. Know what you need before you torque.
Quality / Compliance.
- ISO 9001 or ISO 14001 are about how the supplier’s processes are managed, not the geometry of the fasteners themselves. However, these standards are essential if you need evidence of consistent quality or environmental responsibility - Accu provides a certificate of conformity with every order!
- Mechanical property standards like ISO 898‑1 or ISO 3506 are critical when specifying performance, strength class and usage environment (e.g., stainless steels), ensure you understand your project requirements and select components with the corresponding ISO code to guarantee suitability.
Continuously Evolving
ISO occasionally updates or merges standards across all sectors. For instance, some older DIN standards have official ISO equivalents that might not be widely adopted comemrcially yet. Always confirm the latest version with ISO or ask our customer service team if you need absolute surety on a component's suitability for your project.