S-92991A535 1/4"-20 x 3/8" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with brass construction, ideal for harsh environments and extended service life
• Exceptional thread engagement with Class 3A fit for reliable, vibration-resistant fastening in precision assemblies
• High durability from Rockwell B55 hardness, maintaining structural integrity under repeated adjustments
• Secure, non-slip installation using the 1/8" hex drive, allowing for high torque application without tool slippage
• Firm component locking with the cup point tip that bites into surfaces to prevent loosening
• Broad compatibility with UNC coarse threads for quick assembly and disassembly in various industrial applications
• Regulatory compliance assurance meeting ASME B18.3, RoHS 3, and REACH standards for safe, global usage

Professional Applications & Engineering Value

This 1/4-20 UNC Class 3A brass set screw is engineered to address critical challenges in industrial settings, such as component slippage and corrosion-induced failure. The brass material provides inherent resistance to rust and galvanic corrosion, making it suitable for electrical components, marine equipment, and plumbing systems where moisture exposure is common. Its hex drive design and cup point tip ensure maximum torque transmission and secure gripping on shafts or collars, preventing rotational movement in machinery. With a coarse thread profile, it offers faster installation and reduced cross-threading risks, enhancing assembly efficiency in automotive, aerospace, and manufacturing applications. The headless construction allows for flush mounting in confined spaces, supporting compact design requirements without compromising on holding strength.

Specification Summary & Compliance

This set screw adheres to Class 3A thread tolerance for precise fit and UNC thread standards ensuring interchangeability. Manufactured in compliance with ASME B18.3 specifications, it guarantees dimensional accuracy and performance reliability. The product is confirmed RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, meeting environmental and safety regulations for hazardous substance restrictions.