5/16-18 x 1 1/4 18-8 Stainless Steel Flat Head Cap Screw with Nylon Insert keeps the top surface clear when a matching inch-series countersink is prepared. When installed in the correct countersink, the flat head leaves little exposed hardware for covers, panels, or moving material to catch.

This size is often reviewed for conveyor transfer plates, guide covers, and moving product areas when stainless material, a flush head, and locking friction are all specified. Plain 18-8 Stainless Flat Head Socket Cap Screws may fit torque-once joints where a nylon insert is not required.

Because the locking element is nylon, confirm the service temperature separately from the stainless screw selection; this listing does not state a limit. Since 1962, Cold Headers has helped distributors, repair teams, and OEM sourcing projects locate specialty socket products.

Technical Highlights

• Material: 18-8 Stainless Steel
• Thread Size: 5/16-18
• Length (overall - includes head): 1 1/4 in.
• Head Style: 82° Countersunk Flat
• Drive Type: Internal Hex
• Locking Feature: Nylon insert providing prevailing torque
• Nylon Insert Diameter (P): 1/8 in.
• Nylon Insert Location (N): 13/64 in. +/-1/2 pitch
• Head Dimensions: ASME B18.3

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