S-94495A251 1/4"-28 x 1/4" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Permanent vibration resistance with integrated nylon patch thread locker that maintains secure locking without requiring separate adhesives
• Superior corrosion protection through black-oxide coating on alloy steel, extending service life in demanding environments
• Precision thread engagement with Class 3A fit ensuring consistent, reliable fastening in critical applications
• High-temperature performance with thread locker effective from -70° to 250°F for stable operation in thermal cycling conditions
• Optimized torque transmission through 1/8" hex drive design that prevents cam-out and tool slippage
• Enhanced material strength with Rockwell C45 hardness providing excellent durability under mechanical stress
• Space-saving installation with headless design allowing flush mounting where clearance is limited

Professional Applications & Engineering Value

These 1/4"-28 UNF Class 3A set screws with nylon patch locking technology address critical challenges in precision assemblies where vibration-induced loosening compromises system integrity. The black-oxide alloy steel construction provides superior corrosion resistance while maintaining the structural strength needed for demanding industrial applications. The fine thread configuration ensures maximum engagement in softer materials and delicate components, while the headless hex drive design enables installation in confined spaces where traditional fasteners cannot be used. Engineered to ASME B18.3 specifications, these set screws deliver reliable performance in machinery, automotive, and aerospace applications where thermal cycling and mechanical stress are constant concerns.

Specification Summary & Compliance

This precision fastener features 1/4"-28 UNF fine threads with Class 3A tolerance for superior fit and consistent performance. Manufacturing complies with ASME B18.3 specifications where applicable under ASTM F912. The product is certified RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting current environmental regulations for industrial use. The nylon patch thread locker maintains effectiveness across the specified temperature range of -70° to 250°F, while the Rockwell C45 hardness ensures dimensional stability under load.