Description
Button Head Hex Socket Screw M4 x 8 A2 Stainless Steel Full Thread ISO 7380-1 — BOLTON SKU 53355.
About the Button Head Hex Socket Screw M4
ISO 7380-1 defines button head screws with a low, domed head and an internal hexagon drive. This Button Head Hex Socket Screw M4 variant carries the standard metric coarse thread for M4 (0.7 mm pitch), is 8 mm long and is fully threaded to the head, allowing clamping in thin or short-grip joints. It is driven with a 2.5 mm hexagon key, the socket size ISO 7380-1 assigns to the M4 size. The material is A2 austenitic stainless steel (304-type), giving good resistance to atmospheric corrosion without plating. The wide, low-profile dome head spreads bearing load over a larger area than a cylindrical cap head of the same thread size while protruding less above the surface. Button heads are intended for light- to medium-duty clamping; where maximum preload matters, a deeper-socket cap head screw is normally preferred — a known trade-off of the button head form.
Key specifications
| Thread | M4 × 0.7 (metric coarse) |
|---|---|
| Length | 8 mm, full thread |
| Head style | Button (dome) head, low profile |
| Drive | 2.5 mm internal hexagon socket |
| Material | A2 austenitic stainless steel |
| Standard | ISO 7380-1 |
Typical applications
This short, fully threaded M4 size suits fastening thin panels, covers, guards and small brackets where a low, snag-free head is preferred over a protruding cap screw. The A2 stainless finish makes it a common choice on enclosures and fixtures exposed to humid or unconditioned environments.
Supplied by BOLTON Technical Equipment Supplies against request for quotation. Add this item to your RFQ basket to request pricing, lead time and documentation requirements (e.g. CoC, datasheets or test reports where applicable).
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