304 - Stainless steel - Hexagon socket button head screw

Why Choose 304 Button Head Screws?

In many applications, a standard cap screw is too tall or looks too "industrial." The 304 button head screw solves this by offering a smoother, more aerodynamic profile. While it uses a slightly smaller hex key than a cap screw, it provides sufficient torque for securing covers, electronic casings, and non-structural components. The A2 stainless steel ensures that the fastener remains visually appealing without plating that could peel off.

Material Specifications: A2-70

Our 304 button head screws are manufactured to the A2-70 strength class, balancing ductility with tensile strength:

Chemical Composition (18/8 Steel)

Grade 304 contains 18% Chromium and 8% Nickel. This chemistry forms a passive surface film that self-heals if scratched. It is the ideal choice for environments where the screw is exposed to damp air or occasional water splashes.

Tensile Strength (700 MPa)

A2-70 indicates a minimum tensile strength of 700 N/mm². While this material is strong, engineers must remember that due to the head design of ISO 7380, button head screws are not intended for high-stress critical loads like cylindrical cap screws are.

Temperature Tolerance

304 stainless steel maintains its mechanical properties across a wide temperature range, resisting oxidation better than carbon steel in high-heat environments (up to 870°C for intermittent service).

Quality Assurance

Product consistency is key to our service. We can provide an EN 10204 3.1 Material Certificate upon request, verifying the chemical composition and mechanical properties of the stainless steel batch. Please note that third-party inspection services require an additional fee.

Typical Applications

304 button head screws are widely used where aesthetics and function meet:

• Automotive Interiors: Securing dashboard panels and door trims.
• Signage and Displays: Fastening acrylic or metal sheets where the head is visible to the public.
• Furniture Manufacturing: Assembly of metal-framed furniture where a smooth head prevents clothing snags.
• 3D Printing Rigs: Frame assembly for aluminum extrusions.

Frequently Asked Questions

Are 304 button head screws suitable for load-bearing structures?

Generally, no. While the A2-70 material is strong, the ISO 7380 button head design has a smaller shear area in the head compared to a standard DIN 912 cap screw. For critical structural loads or heavy lifting, we recommend using a standard Cylinder Head Cap Screw (DIN 912) instead.

Can I use thread locking fluid (e.g., Loctite) on these screws?

Yes, and it is often recommended. Since button head screws have lower torque limits (due to the smaller hex drive), they can't be tightened as aggressively as other bolts. Using a medium-strength thread locker helps prevent them from vibrating loose over time without needing to over-torque the head.

What size hole should I drill for these screws?

Button head screws are typically used in clearance holes. For a standard fit (Series medium), the clearance hole should be slightly larger than the thread diameter. For example, for an M6 screw, a 6.4mm or 6.6mm hole is standard. Avoid tight tolerance holes unless you are tapping a thread directly into the material.