5/16-18 x 1 18-8 Stainless Steel Flat Head Cap Screw with Nylon Insert supports flush stainless fastening where vibration can work on the threaded joint. The inch-series flat head angle is 82 degrees; metric flat heads are commonly 90 degrees, so the countersink angle should be checked before substitution. A buyer moving from socket head cap screws should remember that flat heads are not measured from under the head.

In electronics enclosures, flush cabinet faces, or control panels, the internal hex drive supports top-side installation after the countersink is prepared. 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. Cold Headers helps industrial buyers confirm hard-to-find countersunk socket fastener sizes for maintenance and production work.

Technical Highlights

• Material: 18-8 Stainless Steel
• Thread Size: 5/16-18
• Length (overall - includes head): 1 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.