S-91375A724 1/2"-13 x 3" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Exceptional holding power with Class 3A thread fit for secure, vibration-resistant fastening in demanding applications
• Superior corrosion resistance from the black-oxide finish, extending service life in harsh industrial environments
• High-strength durability provided by alloy steel with Rockwell C45 hardness, resisting deformation under heavy loads
• Easy installation and removal with the 1/4" hex drive, allowing high torque application without head interference
• Enhanced grip and alignment from the cup tip design, minimizing component slippage and damage
• Reliable coarse threading with UNC 1/2"-13 specification for quick assembly and strong engagement in various materials
• Full regulatory compliance meeting ASME B18.3, RoHS 3, and REACH standards for safe, quality-assured industrial use

Professional Applications & Engineering Value

This black-oxide alloy steel set screw delivers critical performance where vibration resistance and permanent positioning are paramount. The headless design with hex drive enables flush mounting in confined spaces while accommodating high installation torque. Its UNC coarse threads provide rapid engagement and superior holding strength in pulleys, gears, and collars, preventing rotational slip in power transmission systems. The cup tip concentrates pressure on a small contact area, creating positive locking without marring shaft surfaces. Engineered for industrial machinery, automotive assemblies, and heavy equipment, this fastener solves alignment and security challenges in high-stress applications where reliability cannot be compromised.

Specification Summary & Compliance

Manufactured to precise Class 3A thread fit tolerances ensuring consistent engagement and optimal clamping force. The 1/2"-13 UNC coarse thread specification guarantees compatibility with standard components. Full compliance with ASME B18.3 manufacturing standards, RoHS 3 (2015/863/EU) for restricted substance control, and REACH (EC 1907/2006) regulations ensures environmental responsibility and workplace safety. The 3" length provides sufficient engagement depth for secure fastening in various material thicknesses.