S-91375A480 7/8"-9 x 1 1/4" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Exceptional holding power with Class 3A thread fit for secure, vibration-resistant fastening in high-stress environments
• Superior corrosion resistance from Black-Oxide coating, extending service life in harsh industrial conditions
• High-strength durability with Rockwell C45 hardness alloy steel, resisting deformation under heavy loads
• Reliable installation torque via 1/2" hex drive, preventing tool slippage and ensuring consistent tightening
• Optimized thread engagement with coarse UNC threads for faster assembly and reduced cross-threading risks
• Secure component positioning using cup tip design that creates positive locking without damaging shafts
• Space-saving headless construction allowing flush mounting where clearance is limited

Professional Applications & Engineering Value

This Black-Oxide Alloy Steel set screw delivers critical performance in demanding industrial applications where vibration resistance and positional security are paramount. The 7/8"-9 UNC coarse threads with Class 3A fit provide superior grip strength for securing gears, pulleys, and collars on rotating shafts. The Rockwell C45 hardness ensures the cup tip maintains its form under repeated adjustments, while the 1/2" hex drive accommodates high torque installation without stripping. Engineered for machinery, automotive, and heavy equipment applications, this headless set screw solves alignment challenges in confined spaces while offering reliable, long-term fastening solutions.

Specification Summary & Compliance

Manufactured to ASME B18.3 and ASTM F912 specifications with Class 3A thread fit precision. Features right-hand 7/8"-9 UNC coarse threads with 1-1/4" length and 1/2" hex drive. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for industrial use.