S-91375A734 1/2"-20 x 1" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating, extending service life in demanding industrial environments.
• Exceptional holding power provided by the Class 3A thread fit, ensuring precise, vibration-resistant fastening for critical assemblies.
• High-strength durability from Rockwell C45 hardened alloy steel, resisting wear and deformation under heavy loads.
• Secure, flush installation with a headless, hex drive design, ideal for confined spaces and preventing snagging.
• Enhanced grip and minimal surface damage due to the cup tip, which concentrates force for reliable component positioning.
• Broad compliance with ASME B18.3, RoHS 3, and REACH, guaranteeing quality and environmental safety for global supply chains.
• Fine thread spacing for improved adjustment accuracy and superior resistance to loosening in high-vibration applications.

Professional Applications & Engineering Value

This Black-Oxide Alloy Steel Set Screw is engineered to address common industrial challenges such as component slippage, corrosion, and assembly space constraints. The 1/2"-20 UNF fine thread and Class 3A fit deliver tight tolerances and reliable clamping force, crucial for precision machinery, automotive components, and permanent fixturing where vibration resistance is paramount. The headless design with a 1/4" hex drive allows for easy installation in recessed or tight spaces, while the cup tip minimizes damage to shafts and gears, preserving the integrity of aligned parts. Made from hardened alloy steel, it withstands repetitive stress and harsh conditions, making it a trusted solution for OEMs and maintenance teams requiring durable, compliant fasteners.

Specification Summary & Compliance

This set screw features a 1/2"-20 UNF fine thread with a Class 3A thread fit for high precision and strength. It adheres to ASME B18.3 manufacturing specifications, ensuring consistent quality and performance. The product is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), supporting safe and environmentally responsible industrial use. Dimensions include a 1" length and 1/4" hex drive, designed for inch-system applications.