S-91381A535 1/4"-20 x 3/8" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Enhanced Corrosion Resistance: Black-oxide finish on alloy steel provides superior protection against rust and wear in harsh industrial environments.
• Precise Thread Engagement: Class 3A thread fit ensures tight, reliable fastening with minimal backlash for vibration-resistant assemblies.
• Secure Component Protection: Brass soft tip prevents damage to shafts and components, ideal for repeated adjustments without marring surfaces.
• High Torque Application: Hex drive design allows for easy installation with standard tools, supporting heavy-duty fastening needs.
• Optimized for High-Stress Use: Rockwell C28 hardness and alloy steel construction deliver excellent strength and durability under load.
• Broad Compatibility: UNC coarse threads and 1/4"-20 size enable quick assembly and disassembly in various machinery and equipment.
• Space-Saving Design: Headless configuration fits flush in tight spaces, maximizing assembly efficiency.

Professional Applications & Engineering Value

This 1/4"-20 UNC set screw is engineered to address common industrial challenges, such as component slippage and surface damage in precision assemblies. The black-oxide alloy steel body, combined with a Rockwell C28 hardness, ensures long-term reliability in high-vibration applications like motor shafts, pulleys, and gear systems. The brass soft tip provides a secure, non-marring grip, protecting expensive components during adjustments. With its hex drive and coarse threads, it simplifies maintenance in automotive, aerospace, and manufacturing setups, reducing downtime and enhancing operational safety.

Specification Summary & Compliance

This set screw adheres to Class 3A thread fit tolerances for precise engagement, meeting ASME B18.3 standards for dimensional accuracy. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity in global supply chains.