3/8-16 x 2 1/2 18-8 Stainless Steel Flat Head Cap Screw with Nylon Insert pairs ordinary moisture resistance with a nylon pellet for thread-friction locking. When installed in the correct countersink, the flat head leaves little exposed hardware for covers, panels, or moving material to catch. Overall-length measurement matters on countersunk joints because the head occupies part of the thickness stack.
For bracket faces, panel-mounted hardware, or smooth machine surfaces, confirm countersink geometry, thread engagement, and whether the nylon insert suits the service conditions. 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 can help verify the exact 18-8 flat head nylon-insert configuration before quoting pricing and availability.
Technical Highlights
- Material: 18-8 Stainless Steel
- Thread Size: 3/8-16
- Length (overall - includes head): 2 1/2 in.
- Head Style: 82° Countersunk Flat
- Drive Type: Internal Hex
- Locking Feature: Nylon insert providing prevailing torque
- Nylon Insert Diameter (P): 9/64 in.
- Nylon Insert Location (N): 7/32 in. +/-1/2 pitch
- Head Dimensions: ASME B18.3
Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.
