5-40 x 5/16 18-8 Stainless Steel Button Head Socket Cap Screw is used when a button-head profile, socket engagement, and everyday corrosion resistance are important to the design. This head style is distinct from flat head, low head, pan head, and standard socket head cap screw geometry. The internal hex drive supports socket-key installation where external wrenching space is limited.
Typical applications include machine covers and equipment housings, where internal hex access supports installation where external wrench clearance is limited. It can also serve instrumentation and commercial equipment, where the stainless material provides a clean look for visible or frequently handled hardware. The rounded head profile is useful on visible or frequently handled assemblies.
For routine washdown or cleaning applications, 18-8 stainless can provide a practical balance of appearance and corrosion resistance. For the 5-40 thread and 5/16 in. length, the reference head diameter is 0.226-0.238 in. and the head height is 0.058-0.066 in.
Reference dimensions may vary slightly by manufacturer.
Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.
