S-91375A078 2-56 x 5/16" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Exceptional holding power with Class 3A thread fit for secure, vibration-resistant fastening in demanding applications
• Superior corrosion resistance provided by the black-oxide finish on alloy steel, extending service life in industrial environments
• High mechanical strength from Rockwell C45 hardness, ensuring reliable performance under heavy loads and stress
• Easy installation and removal with the 0.035" hex drive, allowing for efficient maintenance and adjustments
• Secure component positioning thanks to the cup tip design, which minimizes surface damage and improves grip
• Broad compatibility with UNC coarse threads, making it suitable for a wide range of machinery and equipment
• Regulatory compliance assurance meeting ASME B18.3, RoHS 3, and REACH standards for safe, global industrial use

Professional Applications & Engineering Value

This 2-56 UNC set screw is engineered to address critical challenges in precision assembly and machinery maintenance. The black-oxide alloy steel construction offers enhanced durability and resistance to wear, while the Class 3A thread fit ensures tight tolerances for minimal backlash in high-vibration environments. Its headless design with hex drive allows for flush mounting in confined spaces, ideal for securing collars, gears, and pulleys without protruding components. The cup tip concentrates force effectively, reducing the risk of workpiece marring. Commonly used in automotive, aerospace, and industrial equipment, this screw provides reliable torque transmission and long-term performance, backed by ASME B18.3 specifications for consistent quality.

Specification Summary & Compliance

This set screw features precise UNC coarse threads with a Class 3A fit for superior thread engagement and dimensional accuracy. It adheres to ASME B18.3 manufacturing standards, ensuring reliable performance in mechanical systems. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of hazardous substances for safe industrial use. Additional specifications include a right-hand thread direction, 5/16" length, and 0.035" hex drive size, all designed to meet rigorous engineering requirements.