1/4-28 x 5/16 Cup Point 18-8 Stainless Steel Socket Set Screw with Nylon Insert combines cup-point bite, internal hex drive access, and nylon prevailing torque. The cup point may leave a witness mark depending on shaft material and installation conditions, while the insert works in the threaded engagement. Use 18-8 stainless where the drawing calls for stainless material in indoor machinery, washdown-adjacent equipment, or humid service.
Typical uses include outdoor equipment linkages, adjustable stops, and service hardware, where the set screw must hold position without an external head. If shaft protection matters more than cup-point bite, Nylon and Brass Tip 18-8 Socket Set Screws solve a different problem than nylon inserts.
Cold Headers brings long-running socket fastener knowledge to cup point set screw quoting and cross-checking. Review the thread size, length, hex key size, point style, and set-screw pellet location before matching the part to a service record or drawing.
Technical Highlights
- Point: Cup point, approx. 0.55-0.62 x nominal dia.
- Material: 18-8 Stainless Steel
- Thread Size: 1/4-28
- Length: 5/16 in.
- Drive: Internal Hex
- Hex Key Size: 1/8 in.
- Locking Feature: Nylon insert providing prevailing torque
- Nylon Insert Diameter (P): 7/64 in.
- Nylon Insert Location (N): 3/16 in. +/-1/2 pitch
- Dimensional Standard: ASME B18.3
Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.
