S-91375A908 1"-8 x 1 1/2" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Exceptional holding power with Class 3A thread fit for precise, vibration-resistant fastening in demanding applications
• Superior corrosion resistance provided by the black-oxide finish, extending service life in industrial environments
• High-strength durability from Rockwell C45 hardened alloy steel, preventing deformation under heavy loads
• Secure, flush installation with headless design and cup tip for permanent positioning without protrusion
• Easy installation and removal using the standard 9/16" hex drive, compatible with common tools
• Reliable coarse threading (1"-8 UNC) for quick assembly and reduced cross-threading risk
• Full regulatory compliance meeting ASME, ASTM, RoHS 3, and REACH standards for safe global use

Professional Applications & Engineering Value

This black-oxide alloy steel set screw delivers critical performance where permanent component positioning is essential. The Rockwell C45 hardness ensures the cup tip maintains its form under extreme vibrational forces, preventing loosening in machinery, pulleys, and gears. The 1"-8 UNC coarse thread with Class 3A fit provides superior engagement in softer materials or when rapid assembly is required, while the headless design allows for flush mounting in space-constrained applications. Engineered to ASME B18.3 specifications, it solves common industrial challenges of component slippage and fastener failure in high-stress environments.

Specification Summary & Compliance

Manufactured to precise Class 3A thread fit tolerances per UNC standards with 1"-8 coarse threading. Complies with ASME B18.3 and ASTM F912 manufacturing specifications. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements for hazardous substance restrictions.