S-91301A035 5/8"-11 x 5/16" Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance through black-oxide coating that protects against rust and extends service life in demanding environments
• Maximum thread engagement reliability with Class 3A fit ensuring precise, vibration-resistant connections in critical assemblies
• Exceptional mechanical strength from Rockwell C45 hardened alloy steel that withstands high torque and heavy loads
• Secure installation and removal with 5/16" hex drive design providing positive tool engagement without stripping
• Optimized for high-vibration applications featuring coarse UNC threads that maintain grip under dynamic loading conditions
• Space-saving headless design allowing flush mounting where clearance is limited while maintaining full fastening strength
• Compliance with global environmental standards including RoHS 3 and REACH for use in regulated industries worldwide

Professional Applications & Engineering Value

This 5/8"-11 UNC Class 3A set screw delivers critical performance in industrial applications where vibration resistance and precise positioning are paramount. The black-oxide alloy steel construction provides excellent corrosion protection while maintaining the Rockwell C45 hardness needed for repeated tightening cycles. The coarse thread configuration ensures rapid installation and superior holding power in soft materials or where vibration loosening is a concern. As a headless set screw with hex drive, it offers flush mounting capabilities for machinery, automotive components, and precision equipment where protruding fasteners are unacceptable. The right-hand thread direction follows industry standards for straightforward installation, making it ideal for production environments requiring efficiency and reliability.

Specification Summary & Compliance

This set screw features 5/8"-11 UNC coarse threads with Class 3A thread fit for precision engagement and vibration resistance. Manufactured from alloy steel with black-oxide surface treatment and heat-treated to Rockwell C45 hardness. The fastener is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting international environmental regulations for industrial use. Standard thread direction is right-hand with hex drive size of 5/16" and overall length of 5/16".