S-95235A530 1/4"-20 x 5/16" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Vibration-resistant locking with permanent nylon patch thread locker that maintains integrity up to 250°F
• Exceptional holding power through extended tip design (0.156" diameter) for superior grip in mating components
• Precise thread engagement with Class 3A external thread fit ensuring reliable assembly and reduced cross-threading risk
• Durable alloy steel construction with Rockwell C45 hardness for long-term performance in demanding applications
• Easy installation and removal with hex drive (1/8") design allowing secure tool engagement in confined spaces
• Industry-standard compatibility with UNC coarse threads (1/4"-20) meeting common assembly requirements
• Headless configuration enabling flush mounting where protruding fasteners are not feasible

Professional Applications & Engineering Value

This alloy steel set screw with nylon patch thread locker addresses critical vibration-induced loosening challenges in industrial machinery, automotive components, and precision equipment. The extended tip design (0.156" diameter) creates positive engagement with shaft collars, pulleys, and gears, preventing rotational slippage under dynamic loads. The Class 3A thread fit ensures precise mating with corresponding internal threads, reducing installation torque variations and improving assembly consistency. With its headless configuration and hex drive, this fastener provides reliable clamping force in space-constrained applications where traditional bolt heads would interfere. The UNC coarse threading offers rapid installation while maintaining strong holding power in both metallic and composite materials.

Specification Summary & Compliance

This 1/4"-20 UNC set screw features Class 3A external thread fit per ASME standards with coarse thread spacing for optimal engagement. Manufacturing conforms to ASME B18.3 specifications where applicable per ASTM F912. The extended tip maintains dimensional precision with tip diameter of 0.156" (-0.007" to 0 tolerance) and tip length of 0.067" (-0.008" to 0 tolerance). Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations ensures suitability for global industrial applications.