S-91381A717 5/8"-11 x 3/4" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior holding power with Class 3A thread fit ensuring precise, vibration-resistant connections in demanding applications
• Enhanced surface durability from black-oxide coating providing corrosion resistance and reduced galling during installation
• Secure component protection with integrated brass soft tip that prevents damage to shafts and mating surfaces while maintaining grip
• High-strength performance through alloy steel construction with Rockwell C28 hardness for reliable load-bearing capacity
• Optimized installation efficiency with 5/16" hex drive design allowing high torque application in confined spaces
• Industry-standard compatibility through UNC coarse thread profile ensuring interchangeability with existing equipment
• Reduced maintenance requirements with headless configuration minimizing snag points and accumulation in moving assemblies

Professional Applications & Engineering Value

Engineered for precision positioning and permanent fastening in industrial machinery, this black-oxide alloy steel set screw addresses critical challenges in high-vibration environments. The UNC coarse thread profile with Class 3A fit maintains clamping force under dynamic loads, while the brass soft tip eliminates marring on precision shafts and rotating components. Particularly valuable in power transmission systems, the headless design with 5/16" hex drive enables flush mounting in pulleys, gears, and collars where protruding fasteners would cause interference. The combination of Rockwell C28 hardness and corrosion-resistant surface treatment ensures long-term reliability in manufacturing equipment, automotive assemblies, and heavy machinery where disassembly frequency is low but failure consequences are high.

Specification Summary & Compliance

This 5/8"-11 UNC set screw maintains precision Class 3A thread fit tolerances with coarse thread spacing for optimal engagement. Manufacturing conforms to ASME B18.3 specifications governing dimensional requirements and mechanical properties. The product is verified RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting current environmental regulations for industrial components. Thread diameter maintains 0.625" nominal dimension with 3/4" length providing sufficient engagement depth for secure fastening applications.