Ultimate Screw Buying Guide: Types & Materials

Selecting the right screws for your project can sometimes seem a daunting task, with thousands of different combinations of screw types and materials.

This helpful screw buying guide simplifies the process by categorising screws based on the materials you're working with as well as offering some key considerations for their use. Whether you're fastening wood, metal, plastic, or masonry, you'll find tailored recommendations to ensure optimal performance.

As well as this we cover some of the essential fastener knowledge you might want to elevate your purchasing decisions to the next level, no fluff just the direct engineering knowledge you need to fasten it right the first time. 

Contents:

• How Do Screws Work and What Are They Used For?

• Some Key Factors in Choosing the Right Screw For the Job.
• What About Screw Corrosion Resistance?
• The different types of Screw Available.

Screws By Type, Quick Reference Tables: 

 

How Do Screws Work and What Are They Used For?

Screws turn rotational force (torque) into straight-line pulling force. As you drive a screw, its spiral threads cut or grip into the material and draw the screw forward, clamping the pieces you are fastening together.
Picture an inclined plane or ramp wrapped around a cylinder: each turn pushes the screw a little deeper while locking it firmly in place. This simple idea lets screws join timber, metal, plastic, and more with strong, reliable hold using only a screwdriver or drill.

Screw Anatomy.

To understand how screws achieve this holding power, it helps to know their key parts. A typical screw has four primary components – the Head, Shank, Thread and Point. Understanding these elements and the role they play can help improve your screw purchasing decisions.
You can learn more about these specific features in our How To Measure A Screw Guide.

Some Key Factors in Choosing the Right Screw For the Job.

We recommend you choose screws that are specifically designed for the materials you are joining or the task you are looking to complete. Using a screw intended for the wrong material can lead to weak joints, difficulty during installation or even outright failure of the fastener or surrounding material.

Below we have some top-level tips and considerations for fastener selection by material, later on in this screw buying guide you will find detailed tables with material recommendations along side each fastener type and its options. 

Wood (Softwood vs Hardwood):

Opt for wood screws with deep, coarse threads that bite into softwoods. Harder woods often require drilling a pilot hole first to avoid splitting when using larger screws. General-purpose wood screws work for most timber but always check the individual fastener for suitability in your material.

Composites (MDF/Chipboard and similar):

Engineered boards combine glue and wood fibres or veneers, so they don’t behave like solid timber. They can crumble (chipboard), split at the edges (MDF), or delaminate (plywood). Screws for composites thus require coarse deep threads with sharp self-starting points to help them prevent these issues.

Metal (Sheet vs Thick):

For thin sheet metal, use self-tapping sheet metal screws or self-drilling screws that can cut threads into the metal. These often have sharp or drill-point tips (pointed for thin sheets, blunt for thicker sheets).
For thicker metal sections, a normal screw can’t cut its own threads - you’ll need to drill and tap a hole or use a machine screw with a matching sized nut.

Masonry:

Standard screws won’t bite into concrete or brick. Use special masonry anchors or concrete screws with large, aggressive threads designed for stone and concrete. Typically, you drill a pilot hole in the masonry, then either insert a wall plug (for regular screws) or drive in a concrete screw.

Plastics: 

Some screws are specifically made for plastic (e.g. Polyfix Screws for Plastics) which cut into plastic without cracking it. Always start gently to avoid overtightening – plastic can be soft or brittle. If the assembly will be taken apart repeatedly, consider using threaded inserts in the plastic and fastening with a machine screw, since plastic threads wear out with frequent reuse.

What About Screw Corrosion Resistance?

You should always consider the screw’s main material and coating in relation to the environment it will be used in. The right choice will help prevent rust and degradation of the fastener over time whereas the wrong one can lead to poor performance outcomes or even outright failure.
Indoor screws in dry conditions can be basic steel, but outdoor, marine, or chemically exposed applications demand corrosion-resistant materials or coatings.

Here you can find some top-level tips when considering corrosion resistance, if your project has specific requirements we do advise speaking with a member of our team for absolute certainty in product compliance.

Indoor Vs Outdoor Corrosion & Screws:

Environmental exposure is a key factor when choosing your screw materials.
A2 stainless steel (304) is a popular all-round choice that resists rust in moist or mildly corrosive settings. It’s suitable for both indoor use and general outdoor use under normal conditions (e.g. kitchen fixtures or patio furniture).

A4 stainless steel (316), often called marine grade, contains extra alloying elements for superior corrosion resistance. A4 screws perform better in aggressive environments like coastal areas or chemical facilities, where A2 might eventually tarnish.

In contrast, plain untreated steel or tool steel screws have no inherent corrosion protection – unalloyed steel will begin to rust readily when exposed to air and moisture.
For these reasons, uncoated steel fasteners should be reserved for dry, indoor conditions or low-risk applications to avoid rapid corrosion. 

You can learn more on this topic in our great guide: Does Stainless Steel Rust? 

Specialist Corrosion Resistance Screws:

For highly corrosive or sensitive environments consider specialized plastic screws. 

Screws made from advanced polymers such as PEEK and POM (Acetal) are inherently immune to rust. These plastic fasteners are non-conductive, chemically inert, and moisture-resistant, so they excel where metal screws might fail.

For example, PEEK screws tolerate harsh chemicals and high temperatures, finding use in medical devices and aerospace equipment. Because they won’t corrode or carry electrical charge, polymer screws are valuable in chemical processing, electronics, or any sensitive assembly where metal contamination, conductivity, or magnetism must be avoided.

Custom Coatings & Thread Lockers:

You can further enhance screw performance with specialist coatings like AccuBlack and pre-applied thread locker patches. These upgrades are optional and can be fitted to any of the specified combinations of screw in the tables below where they appear.

The different types of screw available.

This section of our screw buying guide is aimed at helping you quickly select the correct fastener for the job.

We start by breaking down material suitability so you can quickly and easily find a fastener type that fits, before moving on to outline the material and functional specifics of each type of screw as well as any other finishing options or extras. All the information you could ever need is here!

 

 

Machine Screws Explored.

Machine screws are designed to securely join metal or plastic components together. Characterised by uniform shafts and blunt ends, machine screws are ideal for applications requiring consistent and reliable fastening.
Their range of head styles, including countersunk, pan and button heads offers versatility, accommodating flush mounting or easy torque application.

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Machine Screw Material Suitability table:

Materials and Sizes of Machine Screw Available:

Machine Screw Tips:

• Choose head type carefully: Countersunk heads provide flush mounting; pan and hex heads offer easier torque application and load distribution.

• Match materials to environment: Use A2/A4 stainless steel for outdoor or marine exposure, brass for decorative or electrical applications and titanium for weight-critical, high-performance scenarios.

• Include washers: Using washers helps distribute pressure evenly, preventing pull-through or material damage.

 

Wood Screws Explored.

Wood screws (as the name suggests!) are specialised tapping fasteners made for joining wood.
They have sharp, pointed tips and coarse, helical threads that cut into timber, providing a tight, durable hold. Because they bite into the wood grain, wood screws create a far more secure joint than nails.

They see wide use across woodworking and construction: for example, small-diameter screws give precise, clean fastening in cabinetry and fine furniture, while heavy coach (lag) screws join large timbers or decking planks in outdoor builds.

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Wood Screws Material Suitability table:

 

Materials and Sizes of Wood Screws Available:

Wood Screws Tips:

• Pre-drill hardwoods: Pilot holes reduce splitting risk, especially important in dense timber.

• Choose correct material: Opt for stainless steel (A2/A4) screws outdoors to resist corrosion.

• Use appropriate drive type: Matching screwdriver bits (Torx, Pozi, Square) prevent damage and cam-out.

• Include washers in soft wood: Washers help distribute load, preventing pull-through in softer timber.

 

 

Decking Screws Explored.

Decking screws are specifically designed to secure decking boards to subframes and timbers.
They feature sharp, aggressive threads and typically feature self-tapping tips that bite into timber or composite materials, preventing board lifting and warping. Typically, their heads sit flush or slightly recessed to deliver a clean, snag-free finish.

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Decking Screws Material Suitability table:

 

Materials and Sizes of Decking Screws Available:

Decking Screws Tips:

• Select the right diameter and length: Use 4.5–4.8 mm screws for soft timbers or composites; use 5.2 mm for hardwood. Use enough length (board + 20 mm into joist) for secure fixing.

• Opt for A4 stainless in coastal areas: Provides superior corrosion resistance compared to A2, essential in high-salt environments.

• Use the correct drive system: Square or Torx drives reduce cam-out and allow more torque, speeding up installation.

• Look for composite-specific screws: Composite decking requires screws with back-cutting threads and cheese-head design to avoid material raise-up and splitting.

• Avoid over-tightening: Screws should sit flush but not overdrive. Over-tightening can deform board tops or strip threads.

 

 

Landscaping Timber Screws Explored.

Landscaping timber screws are heavy-duty wood fasteners designed for outdoor construction. They are specifically engineered for securing timber elements in garden and landscaping projects.
These screws have aggressive, deep threads and very sharp points that drive easily through wood, creating a firm, lasting grip in the timber fibers and helping to prevent splitting during insertion.

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Screws

 

 

 

Landscaping Timber Screws Material Suitability table:

 

Materials and Sizes of Landscaping Timber Screws Available:

Landscaping Timber Screws Tips:

• Use the sharp point: The very sharp, self-tapping point means these screws normally drive into soft wood easily and help minimise splitting. For very hard or dense timbers, drill a small pilot hole first to guide the screw and avoid stressing the wood or the screw.

• Choose the right driver: Always use a matching Torx or Pozi driver bit. Torx (star) drives are preferred for these screws because they give better grip on the head, allowing higher torque and greatly reducing the chance of cam‑out. This makes installation faster and avoids stripping the screw head.

• Pick the weatherproof finish: For outdoor use, select screws with the green anti-corrosion coating. The coated finish protects the steel from rust and blends with treated timber. This is especially important when fixing decking, garden sleepers or any timber exposed to weather or preservatives.

• Set the screw flush: If using countersunk screws, pre-countersink the hole slightly so the screw head sits flush with the wood surface. Alternatively, use a pan-head screw when a raised head is acceptable. In all cases, drive the screw in until snug – avoid over-tightening, which can strip the wood or the screw head.

 

 

Stainless Steel Screws Explored.

Stainless steel screws are ubiquitous fasteners renowned for excellent corrosion resistance and strength at an attractive cost/performance standard.
Constructed mainly from A2 (304) or marine-grade A4 (316) stainless steel, they’re suited to a truly huge number of applications depending on your project requirements, there is a combination of stainless steel screw for almost any application.

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Stainless Steel Screws Material Suitability table:

 

Materials and Sizes of Stainless Steel Screws Available:

Stainless Steel Screws Tips:

• Pick the head and drive wisely: Countersunk heads give a flush finish, while Torx/hex drives reduce cam‑out and enable higher torque.

• Include thread-lock on vibrating fits: Select screws with pre-applied AccuLock, or use Anu-Lok/Precote 80, to prevent fastener loosening.

• Use washers for load distribution: For soft materials or thin sheet assemblies, add washers to avoid pull‑through and improve bearing.
  
  

 

 

 

Roofing Screws Explored.

Roofing screws are application specific fasteners designed to secure roofing materials, such as metal sheets, corrugated iron, polycarbonate panels and wood - while resisting wind loads and aiding in water shedding through a seal under each screw head.
The rubber or EPDM washer compresses against surface contours and remains flexible over time, making these screws ideal for long-lasting outdoor structures like sheds, canopies and industrial roofing systems.

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Roofing Screws Material Suitability table:

 

Materials and Sizes of Roofing Screws Available:

Roofing Screws Tips:

• Match length to substrate thickness: For thin metal or polycarbonate roofing, choose shorter screws (30–50 mm); for thicker timber or panels, use longer screws up to 300 mm to secure both layers firmly.

• Opt for A4 stainless in harsh environments: Use A2 standard-grade screws for general roofing; for coastal or industrial zones, A4 stainless resists salt spray and chemical exposure.

• Ensure a smooth sealing surface: Clean and press the washer fully against the roofing sheet; avoid over-torquing, which can damage the washer seal and lead to leakage.

• Pre-drill thick or coated sheets: Though these screws Self-drill, pilot holes in thick or coated sheets (especially polycarbonate) help maintain thread quality and avoid cracking or coating damage.

 

 

Drilling & Tapping Fasteners Explored.

Drilling & tapping fasteners are specialised screws designed to either drill their own hole (self-drilling) or cut their own threads (self-tapping) in metal or plastic assemblies.
They save time and reduce component installation time as no separate drill and tap operation is required. These fasteners are essential in precision engineering, sheet metal fabrication, HVAC, electronics and construction where efficiency, secure hold and repeatable performance are critical.

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Fasteners

 

 

 

 

Drilling & Tapping Fasteners Material Suitability table:

 

Materials and Sizes of Drilling & Tapping Fasteners Available:

A Comparison: Self-Tapping vs Self-Drilling Screws & Bolts

• Self-Tapping Screws (Pozi, Torx, Phillips, Slotted, Hexagon): create threads in pre-drilled holes. Easy alignment but a slightly longer installation time.

• Self-Drilling Screws: integrated drill point, no pilot hole needed however more care is needed during installation to keep alignment, faster installation times.

• Self-Tapping/Drilling Bolts: flange or hex ends for spanner/socket use are ideal for thicker materials and require pilot/no pilot as per their screw counterparts above. 

 

 

Electrical Socket Screws Explored.

Electrical socket screws are standard components designed for secure fastening within electrical enclosures, junction boxes, switchgear and other electrical fittings.
These screws typically feature a button‑head with an internal socket drive (hex or Torx), ensuring a flush, compact appearance while providing safe, vibration-resistant retention.

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Screws

 

 

 

Electrical Socket Screw Material Suitability table:

 

Materials and Sizes of Electrical Socket Screws Available:

Electrical Socket Screws Tips: 

• Frequently service electrical assemblies: Use captive screws to reduce the risk of losing screws during maintenance.

• Ensure safe electrical performance: Select PEEK screws when electrical insulation or non-conductivity is required.

• Select anti-tamper variants when needed: Use security socket screws in sensitive or public installations to discourage tampering.

 

 

 

Concrete Screws Explored.

Concrete screws are self-tapping fasteners engineered to secure into concrete, brick or stone without plugs. These screws feature notched threads cut directly into a pre-drilled hole, forming an interference fit that offers high load resistance and durability with minimal installation steps.

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Concrete Screws Material Suitability table:

 

Materials and Sizes of Concrete Screws Available:

Concrete Screws Tips:

• Choose the head for your application:
  - Flanged hexagon heads offer greater pull-out resistance for heavy loads.
  - Torx countersunk heads provide flush installs in masonry substrates.

• Use high-quality drive: Torx or hex drives deliver higher torque with lower slip and improved installation accuracy.

• Mind the coating/environment: For external or coastal zones, prefer galvanised finish over zinc-plated for improved longevity.

 

 

 

Chipboard Screws Explored.

Chipboard screws are specialised fasteners designed for particleboard, MDF and similar composite wood panels.. They feature a sharp, coarse thread and point that bite easily into the soft, brittle chipboard material, giving excellent grip while minimising splitting.

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Chipboard Screws Material Suitability table:

 

Materials and Sizes of Chipboard Screws Available:

Chipboard Screws Tips:

• Avoid splitting and crumbling: Pre-drill pilot holes when working near edges or use cutting-tip chipboard screws to reduce stress in brittle boards.

• Use fully-threaded screws for subfloors: These offer maximum grip across both boards and reduce movement over time.

• Select drive type for torque control: Torx or Pozi drives reduce cam-out and maintain a clean finish, especially important for visible joinery

• Match finish to environment: Use stainless steel screws in outdoor or damp areas; blackened finishes for aesthetic appeal in exposed installations.

 

 

MDF Screws Explored.

MDF screws are specialised wood fasteners made for joining medium-density fibreboard. They feature deep, self-tapping threads that bite into MDF without splitting it, helping to distribute the load evenly so joints remain strong and crack-free.The flat (countersunk) head sits flush in the board for a smooth, professional finish.
These screws typically use a Pozi (PZ2) drive for positive bit engagement and easy installation, giving high holding power in furniture, shelving and cabinetry applications and helping prevent cam-out during installation.

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MDF Screws Material Suitability table:

Materials and Sizes of MDF Screws Available:

MDF Screws Tips: 

• Pre-drill pilot holes: to reduce the risk of splitting, especially near edges or in thinner panels.

• Countersink properly: for a flush finish, ideal for visible joinery or where laminate surfaces are involved.

• Use the correct Pozi driver bit (PZ2): to prevent cam-out and ensure consistent torque application

• Avoid overtightening: MDF can compress, drive screws just below the surface to avoid surface distortion.
  

 

Masonry Anchors Explored.

Masonry anchors are specialist self-tapping screws designed for fixing directly into solid masonry (concrete, brick, block or stone) without the need for wall plugs or resin.
For example, Thunderbolt™ anchors cut their own thread into the substrate during installation. This all-metal, non-expanding design means the masonry itself acts as the “nut”, yielding very high pull-out resistance.
 
In practice, these anchors provide simple, secure heavy-duty fixings in concrete or brickwork. They are widely used where strong, permanent anchorage is required and compatibility across concrete, brick and natural stone is needed.

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Masonry Anchors Material Suitability table:

 

Materials and Sizes of Masonry Anchors Available:

Masonry Anchors Tips:

• Select head type to match the job: Use hex or flanged hex heads for heavy-duty loads; choose pan or countersunk heads where a flush or low-profile finish is needed.

• Use the correct bit: Match your driver to the screw head—T25 or T30 Torx for pan/countersunk types and a wrench or socket for hex-heads.

• Avoid overtightening: Stop tightening once the head seats flush. Excess torque can damage the masonry or strip the thread.

• Ensure proper embedment: Choose a screw length that allows full engagement into solid material. Partial embedment can compromise holding strength.

 

 

Flooring Screws Explored.

Flooring screws are designed specifically for tongue‑and‑groove floorboards. They feature a low‑profile, 53° countersunk head that sits discreetly within the joint, providing a professional finish without wedging the boards apart .
These flooring screws use Torx drives as standard for secure, high‑torque installation and tri‑lock self‑tapping threads that offer strong hold in both soft and hardwood flooring.

 

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Flooring Screws Material Suitability table:

 

Materials and Sizes of Flooring Screws Available:

Flooring screws Tips:

• Use the correct length and spacing: Choose screw length based on floorboard thickness; spaced typically every 300–400 mm along board lengths to prevent squeaks and gaps.

• Ensure flush appearance: Stick to Torx drives and included T10 bit to seat the head neatly in the groove; avoid over-tightening to preserve board alignment.

• Self-tapping thread matters: The tri-lock thread profile reduces splitting and lifts by securely locking into the board fibres while eliminating need for pre-drilling.

• Use on both hardwood and softwood: These screws perform well in dense hardwoods and softer woods; always apply steady torque

• Match finish to environment: Yellow chromium plating is suitable for indoor flooring; for areas with moisture, consider stainless steel flooring screws.

 

 

Shoulder Screws Explored.

Shoulder screws (also known as stripper bolts or precision shoulder screws) feature a precision-ground, unthreaded shoulder beneath the head.This shoulder acts as a guide or pivot-ideal in sliding, rotating or load-bearing assemblies, while the threaded end secures the fastener in place.
They are engineered to exacting tolerances (±0.025 mm), ensuring accurate alignment and smooth mechanical movement and are commonly used with bearings, pulleys or in precision machinery.

 

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Shoulder Screws Material Suitability table:

 

Materials and Sizes of Shoulder Screws Available:

Shoulder Screw Tips:

• Match shoulder sizes to guide bores: Choose screws with shoulders that match closely to your bore size for precise alignment and low friction rotational motion.

• Select suitable material: Use stainless (A2/A4) in corrosive or hygienic environments; choose hardened steel for load-bearing shafts.

• Use the correct drive type: Hex socket drives offer precise torque control-choose knurled or slotted heads for manual adjustment needs.

• Apply thread-lock if vibration is present: For moving machinery, consider thread-lock options like AccuLock or Precote 80 to prevent self-loosening while allowing dismantling

• Specify head height and profile: Low-profile or ultra-low heads provide a flush appearance; knurled heads support frequent assembly/disassembly by hand.

 

 

 

Grub Screws Explored.

Grub screws (also known as set screws) are headless fasteners designed to sit flush or below the surface of the material they’re installed into. Used primarily to secure one component to another, they are a staple in mechanical assemblies where space is limited or a clean finish is required.
Common applications include locking pulleys, gears or collars to shafts.

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Need more info? Couldent find what you're looking for? Discover our complete guide to grub screws.

 

 

 

Grub Screws Material Suitability table:

Materials and Sizes of Grub Screws Available:

Each screw point type serves a distinct purpose: 

• Cup points provide a strong and secure grip when tightening the screw against other materials.

• Cone points centre precisely in pre-drilled holes.

• Flat points offer a broad, non-damaging contact surface.

• Dog points feature a locating pin for precise axial positioning.

• Knurled cup points offer enhanced grip under vibration.

• Brass and nylon tips protect softer or polished surfaces.

 

 

 

Screws For Plastics Explored.

Polyfix screws are self-tapping fasteners designed specifically for use in plastic materials. They form their own threads in pre‑drilled or modeled holes, with a sharper thread profile that reduces driving effort while increasing pull‑out resistance.
These screws are ideal for plastic housings and lightweight mechanical assemblies, offering secure hold without damaging delicate plastic components.

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Plastics

 

 

 

 

Screws for Plastics Material Suitability table:

 

Materials and Sizes of Screws for Plastics Available:

Polyfix screws are available in two thread types: 30° thread angle – for soft or low-density plastics or 45° thread angle – for medium-density plastics and more brittle resins.

 

Screws for Plastics Tips: 

• Match thread type to plastic density: Use 30° for softer plastics (e.g. LDPE, PP); use 45° for tougher materials like ABS or PC.

• Pre-drill accurately: For best results, drill a pilot hole to suit the screw diameter and depth. Avoid excessive interference that may crack the surrounding material.

• Pick your head type based on load distribution: Flanged button and pan heads distribute clamping force more evenly than countersunk designs.

• Use Torx drive for better torque control: Minimises cam-out and reduces wear during high-volume installations.

• Consider chemical blackening: Ideal for aesthetic applications where a low-reflectivity or uniform black finish is preferred.