4-40 x 5/8 18-8 Stainless Steel Button Head Socket Cap Screw supports compact fastening where external wrench clearance is limited and a clean exposed head is preferred. The relatively broad head can be helpful on covers, guards, and panels where the fastener remains visible. The internal hex drive supports socket-key installation where external wrenching space is limited.

Typical applications include packaging machinery and material-handling systems, where 18-8 stainless steel is often selected for clean appearance and moisture resistance. It can also serve packaging machinery and material-handling systems, where 18-8 stainless steel is often selected for clean appearance and moisture resistance. The rounded head profile is useful on visible or frequently handled assemblies.

The stainless construction supports high-humidity industrial service, control equipment, and general machinery without overstating the material's corrosion performance. For the 4-40 thread and 5/8 in. length, the reference head diameter is 0.201-0.213 in. and the head height is 0.051-0.059 in.

Technical Highlights

• Material: 18-8 Stainless Steel
• Thread Size: 4-40
• Length: 5/8 in.
• Nominal Body Diameter: #4 (.112 in.)
• Head Diameter: 0.201-0.213 in.
• Head Height: 0.051-0.059 in.
• Hex-Key Size: 1/16 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.