S-91375A122 3-48 x 3/8" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Superior vibration resistance with Class 3A thread fit ensuring tight, secure fastening in demanding applications
• Enhanced corrosion protection from black-oxide coating on alloy steel, extending service life in industrial environments
• High-strength performance with Rockwell C45 hardness providing reliable load-bearing capacity
• Precise component positioning using the cup tip design that creates consistent indentation on shafts
• Space-saving installation with headless design ideal for confined spaces and flush mounting requirements
• Quick installation and removal with 0.050" hex drive allowing efficient maintenance access
• Reliable coarse threading with UNC 3-48 specification for faster assembly in various materials

Professional Applications & Engineering Value

This black-oxide alloy steel set screw delivers exceptional engineering value in precision assembly applications where space constraints and vibration resistance are critical concerns. The headless design with hex drive enables flush mounting in pulleys, gears, and collars while maintaining accessibility for service adjustments. The cup tip configuration provides superior gripping action on shafts, preventing rotational slippage under high torque conditions. Manufactured to ASME B18.3 specifications with Class 3A thread fit, this 3-48 UNC set screw ensures precise dimensional accuracy for consistent performance in automotive, aerospace, and industrial machinery applications where reliable component positioning is essential for operational safety and longevity.

Specification Summary & Compliance

This precision set screw features 3-48 UNC coarse threads with Class 3A thread fit for superior tolerance control. The 0.099" diameter x 3/8" length configuration with right-hand thread direction meets exacting dimensional requirements. Manufacturing compliance includes ASME B18.3 standards (ASTM F912) ensuring consistent quality and performance. Environmental certifications include RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant status, confirming adherence to international hazardous substance restrictions for global industrial applications.