5-40 x 1 1/4 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. Compared with taller cylindrical head styles, the button head offers a smoother exposed shape and lower head projection. 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.

The material is useful for indoor and outdoor general-service applications where routine moisture exposure is part of the design environment. For the 5-40 thread and 1 1/4 in. length, the reference head diameter is 0.226-0.238 in. and the head height is 0.058-0.066 in.

Technical Highlights

• Material: 18-8 Stainless Steel
• Thread Size: 5-40
• Length: 1 1/4 in.
• Nominal Body Diameter: #5 (.125 in.)
• Head Diameter: 0.226-0.238 in.
• Head Height: 0.058-0.066 in.
• Hex-Key Size: 5/64 in.
• Drive Type: Internal Hex

Reference dimensions may vary slightly by manufacturer.

Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.