SS Allen Hex Socket Button Head Screw:M3 x 4 - ISO 7380/A2/Full Thread

This fastener is a button head screw manufactured from A2 grade stainless steel, conforming to the ISO 7380 standard. It features an M3 nominal diameter with a full thread extending along the 4 mm nominal length. The design incorporates an Allen hex socket drive, which allows for secure tightening with a standard hex key while maintaining a low-profile head that sits flush or close to the material surface. Buyers select this specific grade for its balance of corrosion resistance and mechanical strength, making it suitable for environments where mild to moderate exposure to moisture or chemicals is expected. To choose the appropriate specification, confirm that the M3 diameter matches your pre-drilled holes and verify that the 4 mm length provides sufficient engagement for the intended substrate without protruding excessively. The full thread ensures maximum gripping power across the entire shaft length, which is critical for thinner materials or where the fastener passes through non-threaded sections.