S-91375A621 3/8"-16 x 5/8" 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 harsh environments.
• High-strength durability from Rockwell C45 hardness, ensuring the set screw maintains integrity under heavy loads.
• Easy installation and removal with the hex drive design, allowing for efficient tool engagement and torque application.
• Reliable positioning thanks to the cup tip, which digs into surfaces to prevent component slippage.
• Broad industry compliance with ASME B18.3, RoHS 3, and REACH standards, ensuring safety and regulatory acceptance.
• Optimized for coarse threads (UNC) for quicker assembly and reduced cross-threading risks in industrial settings.

Professional Applications & Engineering Value

This 3/8"-16 UNC set screw is engineered to address common industrial challenges like loosening under vibration and corrosion in machinery. Constructed from black-oxide alloy steel, it offers enhanced protection against rust, making it ideal for automotive, aerospace, and heavy equipment applications where environmental exposure is a concern. The headless design and hex drive facilitate flush mounting and easy access in confined spaces, while the Class 3A thread fit ensures precise engagement for maximum clamping force. Its cup tip provides a firm grip on shafts and collars, preventing rotational movement and improving assembly reliability in precision fastening tasks.

Specification Summary & Compliance

This set screw adheres to Class 3A thread fit tolerances for high precision, with UNC coarse threads (3/8"-16) and a length of 5/8". It meets ASME B18.3 specifications for dimensional accuracy and is compliant with RoHS 3 and REACH regulations, ensuring it is free from hazardous substances and suitable for global industrial use.