What are M30 Screws?

M30 screws are heavy-duty metric fasteners with a 30mm thread diameter, available in both coarse (3.5mm) and fine (1.5mm) thread pitches. At this scale, the M30 bolt is firmly in the territory of structural and industrial-grade fastening, specified where significant clamping force and load transfer are fundamental to the integrity of the assembly.

In large-scale steel portal frame construction, M30 bolts and nuts connect moment-resisting base plates to foundation anchor assemblies, bearing the full structural load of the building above. The M30 screw represents the upper end of the standard precision fastener range, delivering the mechanical authority that heavyweight engineering projects demand.

How M30 Size Screws Work

M30 screws serve the most demanding sectors of heavy industry, including power generation, petrochemical processing, structural steelwork and large-scale mechanical assemblies. Their 30mm diameter provides one of the largest standard tensile stress areas available, enabling substantial preload values in bolted connections.

In pressure vessel flange assemblies, M30 bolts maintain gasket compression against high internal pressures and thermal cycling. The fine pitch option is often preferred in these applications, where its greater tensile stress area and resistance to self-loosening are critical to maintaining seal integrity. In heavy press and stamping machinery, M30 bolts resist the repeated shock loading inherent to forming operations. M30 bolt lengths can be selected across a range to suit varying grip thicknesses and joint configurations.

Materials M30 Screws Are Made From

Our M30 screws are crafted from high-quality materials to support a variety of operational requirements:

• High-Tensile Steel: Provides exceptional strength and durability, the standard for structural bolting and heavy-load applications.
• Stainless Steel Grades A2 and A4: A2 is a versatile option for general use, while A4 offers superior resistance to corrosion, perfect for marine and chemical environments.
• A4-80 Stainless Steel: Combines the corrosion resistance of A4 with enhanced tensile strength for demanding installations.
• BUMAX Stainless Steel: High-strength stainless steel fasteners combining corrosion resistance with mechanical properties comparable to high-tensile steel.
• Brass: Offers excellent resistance to corrosion and is easy to machine, making it suitable for decorative and electrical applications.
• Aluminium: Lightweight with good corrosion resistance, suited to applications where weight reduction is a priority.
• Nylon and PEEK: Lightweight thermoplastics offering excellent chemical resistance and high thermal stability, used in specialist engineering projects.

Sizes and Types of M30 Screws Available

M30 screws come in a wide range of configurations to meet various project specifications:

• Lengths: Available in lengths ranging from 30mm to 300mm.
• Head Types: Cap head and hexagon profiles are available to suit different installation and clearance requirements.
• Thread Types: Fully threaded, partially threaded and specialised options like captive screws provide flexibility for different fastening requirements.
• Drive Types: Choose from Hex Socket and External Hex drive styles to suit your tooling preferences.
• Finishes: Options such as AccuLock thread locking prevent loosening under vibration, while AccuBlack chemical blackening delivers a sleek, dark aesthetic.

FAQs

Q: What is the thread pitch of an M30 screw?

 A: M30 screws are available in coarse (3.5mm) and fine (1.5mm) thread pitches. The coarse pitch provides deep, robust thread engagement suited to general heavy-duty applications, while the fine pitch offers a greater tensile stress area and enhanced resistance to self-loosening under vibration or thermal cycling.

Q: What M30 bolt lengths are available?

 A: M30 bolt lengths vary by head type. Hexagon bolts (DIN 933) are available in lengths from short through to 200mm as standard, while socket cap head screws offer an extended length range. Non-standard lengths are available through Accu's custom manufacturing service.

Q: What spanner size fits an M30 hex bolt?

 A: An M30 hexagon bolt has a standard across-flats dimension of 46mm, requiring a 46mm spanner or socket for installation.

Q: Are M30 bolts and nuts available together?

 A: Yes. M30 bolts and nuts are available across matching materials, including high-tensile steel and stainless steel grades, in both coarse and fine pitch. Pairing with hardened washers is recommended for optimal load distribution and to protect mating surfaces.

Q: What industries commonly use M30 fasteners?

 A: M30 fasteners are widely used in structural steelwork, power generation, petrochemical processing, pressure vessel construction, heavy plant machinery and large-scale mechanical assemblies.

Bespoke M30 Screws Manufacture.

High precision, bespoke manufacture of M30 Screws to customer specification. State of the art facilities specialising in both small batch prototyping and large scale manufacture.