S-91375A737 1/4"-28 x 1 1/2" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating, extending service life in harsh industrial environments.
• Exceptional thread precision with Class 3A fit, ensuring reliable, vibration-resistant fastening and minimal backlash.
• High-strength durability from Rockwell C45 hardened alloy steel, capable of withstanding heavy loads and repetitive stress.
• Secure, flush installation thanks to the headless design and hex drive, ideal for confined spaces and smooth surfaces.
• Enhanced grip and alignment with the cup tip, providing concentrated holding force on shafts and components.
• Wide compatibility with UNF fine threads (1/4"-28), offering precise engagement in machinery and equipment.
• Regulatory peace of mind by meeting ASME B18.3, RoHS 3, and REACH standards for safe, compliant use.

Professional Applications & Engineering Value

This black-oxide alloy steel set screw is engineered to address critical challenges in precision assembly and machinery. The Class 3A thread fit and UNF fine threads deliver tight tolerances, reducing the risk of loosening under vibration in motors, gears, and rotating shafts. The headless design with hex drive allows for flush mounting in tight spaces, while the cup tip ensures firm contact without damaging components. With Rockwell C45 hardness, it resists wear and deformation in high-stress applications like automotive, aerospace, and industrial equipment, providing long-term reliability and reduced maintenance costs.

Specification Summary & Compliance

This set screw features a 1/4"-28 UNF fine thread with Class 3A fit for high precision, a length of 1 1/2", and a 1/8" hex drive. It complies with ASME B18.3 specifications and is RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, ensuring environmental safety and adherence to industry standards.