S-91375A067 1-72 x 5/16" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with Black-Oxide Alloy Steel construction, extending service life in demanding environments.
• Exceptional holding power and vibration resistance due to the fine UNF thread spacing and Class 3A fit for secure, precise fastening.
• High-strength durability with a Rockwell C45 hardness rating, preventing stripping and deformation under load.
• Secure, flush installation with a headless design and hex drive, ideal for applications where a protruding head is not permissible.
• Reliable, non-slip engagement provided by the cup tip, which bites into the contact surface for a firm grip.
• Broad industrial compliance meeting ASME B18.3 standards, ensuring dimensional accuracy and interchangeability.
• Environmentally responsible manufacturing with RoHS 3 and REACH compliance, safe for use in regulated industries.

Professional Applications & Engineering Value

This 1-72 UNF set screw is engineered to solve critical challenges in precision assembly and machinery. The Black-Oxide Alloy Steel material provides a robust barrier against rust and corrosion, essential for components exposed to moisture or harsh chemicals. Its fine thread spacing and Class 3A thread fit deliver a tighter, more reliable clamp force than coarse threads, significantly reducing the risk of loosening from vibration in motors, gearboxes, and precision instruments. The headless design and hex drive allow for installation in confined spaces, making it a top choice for securing collars, pulleys, and knobs on shafts without interfering with adjacent parts. This combination of a cup tip and high Rockwell C45 hardness ensures the screw maintains its grip and structural integrity, providing long-term reliability in demanding industrial applications.

Specification Summary & Compliance

This set screw features a 1-72 UNF thread with a precision Class 3A fit for superior thread engagement. It is manufactured in accordance with the ASME B18.3 standard, ensuring dimensional accuracy and performance reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free of restricted hazardous substances and safe for industrial use.