S-91410A746 1/4"-20 x 3" ASME B18.6.2 Set Screws

Key Features & Benefits at a Glance

• Superior holding power with coarse UNC threads and Class 2A fit for reliable, vibration-resistant fastening in demanding applications
• Exceptional durability provided by Rockwell B80 hardness steel, ensuring long service life under high-stress conditions
• Easy installation and removal with external square drive and square head design, allowing for high torque application without stripping
• Secure component positioning thanks to the cup tip design that creates positive engagement and prevents slippage
• Full regulatory compliance with ASME B18.6.2 standards, RoHS 3, and REACH for worry-free use in regulated industries
• Versatile 3-inch length accommodates various material thicknesses while maintaining consistent clamping force
• Precision manufacturing ensures consistent thread geometry and dimensional accuracy for repeatable performance

Professional Applications & Engineering Value

This 1/4"-20 UNC steel set screw delivers exceptional engineering value in industrial applications where vibration resistance and permanent positioning are critical. The coarse thread spacing provides superior holding power in softer materials and withstands dynamic loads better than fine-thread alternatives. Manufactured from high-strength steel with Rockwell B80 hardness, this fastener maintains its structural integrity under constant stress, making it ideal for machinery, automotive components, and heavy equipment assemblies. The square head design with external drive allows for high-torque installation without cam-out, while the cup tip creates a positive bite into shaft materials, preventing rotational slippage in pulley systems, gears, and collars. This combination of features solves common industrial challenges of component creep and loosening under operational vibrations.

Specification Summary & Compliance

This set screw features Class 2A thread fit per UNC standards, ensuring proper clearance and engagement for industrial applications. The dimensional specifications conform to ASME B18.6.2 manufacturing standards, guaranteeing interchangeability and reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, containing no restricted substances above threshold limits. With precise 1/4"-20 UNC coarse threads and consistent 3-inch length, this fastener delivers repeatable performance across production runs while meeting international quality and environmental standards.