S-91375A439 10-32 x 5/16" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Superior holding power with fine UNF thread spacing and Class 3A fit for vibration resistance in demanding applications
• Enhanced corrosion protection from black-oxide coating on alloy steel, extending service life in harsh environments
• High-strength durability with Rockwell C45 hardness, maintaining integrity under heavy mechanical stress
• Secure, non-slip installation using 3/32" hex drive for reliable torque transmission without head protrusion
• Precise component positioning with cup tip design that minimizes surface damage while providing firm contact
• Right-hand thread compatibility for standard assembly processes and easy integration with existing UNF components
• Regulatory peace of mind meeting ASME B18.3, ASTM F912, RoHS 3, and REACH compliance for global industrial use

Professional Applications & Engineering Value

This 10-32 UNF Class 3A set screw delivers exceptional performance in precision assemblies where space constraints and vibration resistance are critical. The black-oxide alloy steel construction provides superior corrosion resistance compared to standard finishes, making it ideal for automotive, aerospace, and machinery applications exposed to moisture or chemicals. The headless design with hex drive allows flush mounting in tight spaces while maintaining high torque capability. With fine thread spacing and Class 3A thread fit, it ensures minimal backlash and secure positioning of gears, pulleys, and collars on shafts. The cup tip concentrates clamping force without damaging precision surfaces, solving common slippage issues in high-torque applications while meeting rigorous industry standards.

Specification Summary & Compliance

This set screw maintains Class 3A thread tolerance for precision fit and consistent performance. Manufactured to ASME B18.3 specifications and ASTM F912 material standards, it ensures dimensional accuracy and mechanical reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, containing no restricted substances. With 10-32 UNF fine threads, 5/16" length, and Rockwell C45 hardness, it delivers consistent performance across industrial applications requiring reliable, long-term fastening solutions.