S-91381A622 3/8"-16 x 3/4" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Secure Component Positioning: The brass soft tip prevents surface damage to shafts and hubs while maintaining firm contact, ideal for precision assemblies.
• Exceptional Thread Reliability: Class 3A thread fit ensures tighter tolerances and superior engagement in high-vibration environments.
• Enhanced Durability & Corrosion Resistance: Black-oxide alloy steel construction with Rockwell C28 hardness offers long-lasting strength and moderate corrosion protection.
• Optimized Installation Efficiency: Hex drive (3/16") and headless design allow easy access in confined spaces with standard tools.
• Robust Coarse Thread Performance: 3/8"-16 UNC coarse threads provide quick assembly and higher resistance to loosening under dynamic loads.
• Broad Industrial Compliance: Meets ASME B18.3 specifications and environmental standards (RoHS 3 & REACH) for global supply chain compatibility.
• Damage-Free Fastening Solution: Combined soft tip and right-hand thread enables repeated adjustments without marring critical components.

Professional Applications & Engineering Value

Engineered for demanding industrial settings, this 3/8"-16 UNC set screw addresses common challenges in machinery alignment and rotational component fixation. The black-oxide alloy steel body delivers consistent Rockwell C28 hardness, resisting wear in high-torque applications like motor couplings and gear assemblies. Its brass soft tip (0.188" diameter) distributes pressure evenly, eliminating galling on precision shafts while the Class 3A thread fit maintains positional accuracy under cyclic stresses. Ideal for CNC equipment, automotive drivetrains, and conveyor systems, it combines coarse thread quick-installation benefits with headless hex drive accessibility for maintenance-heavy environments.

Specification Summary & Compliance

This set screw adheres to UNC coarse thread standards with Class 3A thread fit for precision dimensional control (thread diameter: 0.375"). Manufacturing follows ASME B18.3 specifications, ensuring interchangeability and performance consistency. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing safe use in regulated industries. Critical dimensions include 3/4" length, 0.094" tip length, and 3/16" hex drive size for standardized tooling compatibility.