S-91677A122 3/8"-16 x 3/4" Set Screws

Key Features & Benefits at a Glance

• Superior holding power with Rockwell C60 hardened ball tip that bites into shafts for secure, vibration-resistant locking
• Easy installation and removal with 3/16" hex drive design that provides excellent torque transmission without stripping
• Reliable thread engagement through Class 2A UNC coarse threads ensuring consistent fastening performance
• Enhanced corrosion resistance with black-oxide finish protecting against rust in demanding industrial environments
• Maximum material durability from alloy steel construction with Rockwell C32 hardness for long service life
• Environmental compliance assurance meeting RoHS 3 and REACH regulations for safe industrial use
• Precision ball tip design creating concentrated contact pressure for superior grip on rotating components

Professional Applications & Engineering Value

These black-oxide alloy steel set screws deliver exceptional performance in demanding mechanical applications where vibration resistance and secure positioning are critical. The Rockwell C60 hardened ball tip concentrates force on a small contact area, preventing slippage in pulleys, gears, and collars while minimizing surface damage. The 3/8"-16 UNC coarse thread configuration with Class 2A fit ensures rapid installation and reliable engagement in various materials. Headless design allows for flush mounting in confined spaces, while the black-oxide surface treatment provides corrosion protection without dimensional changes. Ideal for precision machinery, automotive components, and industrial equipment requiring repeatable positioning accuracy and long-term fastening integrity.

Specification Summary & Compliance

This set screw features 3/8"-16 UNC coarse threads with Class 2A thread fit per ASME B1.1 standards, ensuring proper clearance for reliable assembly. The 0.375" thread diameter and 3/4" length provide standardized dimensions for interchangeability. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming environmental safety and restricted substance compliance. The alloy steel construction maintains dimensional stability under load, while the ball tip diameter of 0.275" ensures precise contact geometry for optimal clamping force distribution.