4-40 x 5/16 Cup Point Alloy Steel Socket Set Screw with Nylon Insert gives shaft-mounted parts two forms of holding action: point contact and nylon pellet drag. The nylon pellet works in the thread path, so it is different from a nylon tip that is intended to contact the shaft surface.
Pulley and sheave shafts can use this style when an internal hex drive and locking thread feature are both specified. Confirm thread size, length, hex key size, cup point geometry, pellet diameter, and pellet location before substituting another set screw.
For unusual lengths or deeper alloy sizes, Cold Headers keeps the part defined by thread, length, point style, drive, and locking feature. A nylon tip protects the shaft surface; a nylon insert locks the screw in its thread, so nylon and brass tip set screws solve a different problem.
Technical Highlights
- Point: Cup (approximately 0.55-0.62 x nominal diameter)
- Material: Alloy Steel
- Thread Size: 4-40
- Length: 5/16 in.
- Drive: Internal Hex
- Hex Key Size: 0.050 in.
- Locking Feature: Nylon insert providing prevailing torque
- Nylon Insert Diameter (P): 1/16 in.
- Nylon Insert Location (N): 3/32 in., +/-1/2 pitch
- Dimensional Standard: ASME B18.3
Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.
