5/16-18 x 3/8 Cup Point Alloy Steel Socket Set Screw with Nylon Insert is specified when the drawing calls for alloy steel, a cup point, and a nylon locking pellet. Use the nylon-insert version when a plain cup point needs added thread friction after seating.

Rebuilt conveyor and mixer shafts may call for alloy cup point hardware when the application favors seating force over stainless material. Confirm thread size, length, hex key size, cup point geometry, pellet diameter, and pellet location before substituting another set screw.

Use Cold Headers when the requirement is specific: alloy steel body, cup point, internal hex drive, and nylon insert. For wet or washdown service, the related 18-8 stainless cup point set screw with nylon insert is the corrosion-focused catalog choice.

Technical Highlights

• Point: Cup (approximately 0.55-0.62 x nominal diameter)
• Material: Alloy Steel
• Thread Size: 5/16-18
• Length: 3/8 in.
• Drive: Internal Hex
• Hex Key Size: 5/32 in.
• Locking Feature: Nylon insert providing prevailing torque
• Nylon Insert Diameter (P): 1/8 in.
• Nylon Insert Location (N): 7/32 in., +/-1/2 pitch
• Dimensional Standard: ASME B18.3

Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.