S-91381A575 5/16"-18 x 5/16" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Secure component positioning with precision Class 3A thread fit ensuring minimal backlash and reliable fastening in demanding applications
• Enhanced corrosion resistance through black-oxide coating on alloy steel, providing durable protection in industrial environments
• Non-marring surface protection with integrated brass soft tip that prevents damage to sensitive components during installation
• Superior torque transmission via 5/32" hex drive design, allowing for high tightening forces without head deformation
• Optimized for high-vibration applications featuring coarse UNC threads that maintain grip under dynamic loading conditions
• Consistent mechanical performance with Rockwell C28 hardness ensuring dimensional stability and wear resistance
• Space-saving installation through headless design ideal for confined spaces and flush-mount applications

Professional Applications & Engineering Value

This black-oxide alloy steel set screw delivers exceptional engineering value in precision assembly applications where component security and surface protection are paramount. The 5/16"-18 UNC coarse thread configuration provides superior holding power in soft materials and high-vibration environments, while the Class 3A thread fit ensures precise engagement with mating components. The integrated brass soft tip (0.188" diameter) eliminates galling and surface damage on shafts, collars, and precision machinery components, making it ideal for adjustable assemblies requiring repeated positioning. The headless design with 5/32" hex drive enables flush installation in confined spaces while maintaining high torque capability. These features collectively address critical industrial challenges including component slippage, surface degradation, and space constraints in machinery, automotive, and precision equipment applications.

Specification Summary & Compliance

This set screw maintains Class 3A thread fit tolerances per UNC standards with precise 5/16"-18 coarse thread specifications. Manufacturing complies with ASME B18.3 standards for dimensional accuracy and performance. The product meets RoHS 3 (2015/863/EU) compliance for hazardous substance restrictions and REACH (EC 1907/2006) regulations for chemical safety. Material certification includes Rockwell C28 hardness verification for consistent mechanical properties across production batches.