S-91375A820 5/8"-18 x 1 1/2" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating, extending service life in harsh industrial environments
• Precise Class 3A thread fit ensures tight, secure fastening with minimal backlash in critical assemblies
• Exceptional hardness (Rockwell C45) provides excellent wear resistance and maintains clamping force under vibration
• Headless design with 5/16" hex drive allows flush mounting in confined spaces while enabling high torque application
• Cup tip configuration creates positive locking action and prevents damage to shaft surfaces during installation
• Fine UNF thread spacing delivers superior resistance to loosening under dynamic loads and vibrations
• Full regulatory compliance including RoHS 3 and REACH ensures environmental safety and global market acceptance

Professional Applications & Engineering Value

This black-oxide alloy steel set screw with 5/8"-18 UNF Class 3A fine threads addresses critical engineering challenges in industrial machinery, automotive components, and precision equipment. The headless design combined with 5/16" hex drive provides optimal solutions for space-constrained applications where protruding fasteners are impractical. The cup tip ensures maximum gripping power on shafts and rotating components, preventing slippage in high-torque environments. Engineered with Rockwell C45 hardness, these set screws maintain dimensional stability under heavy loads and repeated adjustments. The black-oxide surface treatment offers reliable corrosion protection, making them ideal for manufacturing equipment, power transmission systems, and assembly lines exposed to oils, moisture, and industrial chemicals.

Specification Summary & Compliance

Manufactured to ASME B18.3 specifications and ASTM F912 standards, this set screw features precision Class 3A thread fit with 5/8"-18 UNF fine threads and right-hand thread direction. The 1 1/2" length and 0.625" thread diameter maintain strict dimensional tolerances for consistent performance. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental responsibility and chemical safety in industrial applications worldwide.