4-40 x 1 Cup Point Alloy Steel Socket Set Screw with Nylon Insert is a headless internal-hex fastener for controlled shaft, collar, and hub retention. The internal hex drive keeps installation compact while the pellet adds resistance during installation and removal.

Heavy shaft-mounted components in the 1/2 through 3/4 range are part of the deep-size lane for this alloy family. Confirm thread size, length, hex key size, cup point geometry, pellet diameter, and pellet location before substituting another set screw.

Cold Headers can help quote the requested cup point alloy size without substituting a different point geometry or head style. In-house pellet installation supports exact-size set screw sourcing when the catalog size must include the locking feature. Cone, flat, oval, and half dog point alloy socket set screws with nylon insert use the same locking concept with different point geometry.

Technical Highlights

• Point: Cup (approximately 0.55-0.62 x nominal diameter)
• Material: Alloy Steel
• Thread Size: 4-40
• Length: 1 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.