S-91375A633 3/8"-16 x 2 1/4" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating that protects against rust in demanding industrial environments
• Exceptional holding power from Class 3A thread fit ensuring precise, vibration-resistant fastening in critical applications
• Maximum torque transmission through 3/16" hex drive design that prevents tool slippage and damage during installation
• Enhanced material strength with Rockwell C45 hardness providing reliable performance under heavy loads and stress
• Secure component positioning via cup point tip that creates permanent dimples for non-slip mechanical joints
• Optimized for high-volume assembly with UNC coarse threads enabling faster installation and reduced cross-threading risks
• Space-saving design as a headless set screw ideal for confined spaces where protruding fasteners aren't feasible

Professional Applications & Engineering Value

This black-oxide alloy steel set screw delivers critical engineering solutions for industrial equipment maintenance and manufacturing operations. The UNC coarse thread configuration combined with Class 3A thread fit ensures rapid installation while maintaining precise alignment in pulleys, gears, and collars. The cup point tip mechanically bites into shaft materials, creating permanent positioning that withstands vibration and rotational forces in power transmission systems. Engineered with Rockwell C45 hardness, this fastener maintains its structural integrity under continuous mechanical stress, while the black-oxide surface treatment provides essential corrosion protection in industrial environments containing moisture or chemicals. The headless design with hex drive allows installation in space-constrained applications where traditional fasteners would interfere with adjacent components.

Specification Summary & Compliance

Manufactured to ASME B18.3 specifications with precise 3/8"-16 UNC coarse threads meeting Class 3A tolerance standards for superior fit and function. This set screw maintains compliance with RoHS 3 (2015/863/EU) environmental directives and REACH (EC 1907/2006) regulations, ensuring safe use across various industrial sectors. The 2-1/4" length and 0.375" thread diameter provide consistent dimensional accuracy for reliable performance in precision assemblies.