S-91375A561 1/4"-28 x 3/4" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Superior holding power with Class 3A thread fit for precise, vibration-resistant fastening in demanding applications.
• Enhanced corrosion resistance from the Black-Oxide finish on alloy steel, extending service life in various industrial environments.
• High-strength durability with a Rockwell C45 hardness, ensuring the set screw maintains its form and function under high stress.
• Secure, flush installation thanks to the headless and cup tip design, preventing snagging and providing a positive grip on the shaft.
• Easy installation and removal with a 1/8" hex drive, allowing for efficient assembly and maintenance with standard tools.
• Reliable fine thread engagement from the 1/4"-28 UNF thread, offering improved adjustment precision and load distribution.
• Confidence in compliance by meeting ASME B18.3, RoHS 3, and REACH standards, ensuring quality and environmental safety.

Professional Applications & Engineering Value

This 1/4"-28 UNF Class 3A set screw is engineered to address critical challenges in precision machinery and industrial assemblies where slippage and loosening can lead to equipment failure. Crafted from Black-Oxide alloy steel, it combats corrosion and wear, while the Rockwell C45 hardness ensures it withstands high torque and repetitive stresses. The headless design with a cup tip and fine thread spacing provides a secure, flush fit that minimizes protrusion and maximizes grip on shafts and collars, ideal for applications in automotive, aerospace, and manufacturing equipment. Its hex drive facilitates quick installation, reducing downtime and enhancing operational efficiency in right-hand thread configurations.

Specification Summary & Compliance

This set screw adheres to Class 3A thread fit for high precision and UNF fine thread standards, with a diameter of 0.25" and length of 3/4". It meets ASME B18.3 specifications for dimensional accuracy and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring it is free from hazardous substances and suitable for global industrial use.