S-91375A956 1 1/2"-6 x 1 1/4" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide finish for extended service life in harsh industrial environments
• Exceptional holding power from Rockwell C45 hardness and Class 3A thread fit for vibration-resistant fastening
• High-torque installation capability with 3/4" hex drive for secure tightening without stripping
• Reliable positioning through cup point design that creates permanent seating in shafts and collars
• Quick installation with coarse UNC threads that reduce assembly time and prevent cross-threading
• Space-saving design as a headless set screw for applications with limited clearance
• Industry-standard compatibility meeting ASME B18.3 and ASTM F912 specifications for consistent performance

Professional Applications & Engineering Value

This black-oxide alloy steel set screw delivers critical engineering solutions for industrial machinery and equipment assembly. The 1 1/2"-6 UNC coarse threads with Class 3A fit provide superior resistance to vibrational loosening in high-stress applications such as power transmission systems, gear assemblies, and rotating components. The cup point tip creates permanent indentation in mating surfaces, preventing slippage in shaft collars, pulleys, and couplings. The 3/4" hex drive accommodates high torque requirements while the headless design maximizes space efficiency. The black-oxide surface treatment offers enhanced corrosion protection, making these set screws ideal for manufacturing environments where moisture and chemicals are present.

Specification Summary & Compliance

Manufactured to precise inch system dimensions with 1 1/2"-6 UNC Class 3A threads and coarse thread spacing for optimal engagement. This set screw features a 1 1/4" length and Rockwell C45 hardness rating for consistent mechanical properties. Fully compliant with ASME B18.3 and ASTM F912 manufacturing specifications, ensuring dimensional accuracy and performance reliability. Meets environmental standards including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance for restricted substance control.