S-92949A344 1/4"-20 x 5" ASME B18.3 Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel and passivated finish, ideal for harsh industrial environments.
• Exceptional holding power from Class 3A thread fit and fully threaded design, ensuring reliable, vibration-resistant assemblies.
• High tensile strength of 70,000 psi and Rockwell B55 hardness for demanding applications requiring durability.
• Easy installation and removal with a 5/32" hex drive and rounded button head, reducing tool slippage and assembly time.
• Wide compatibility due to UNC coarse 1/4"-20 threading, fitting standard nuts and tapped holes efficiently.
• Regulatory compliance with ASME B18.3, RoHS 3, and REACH, ensuring safety and environmental standards are met.
• Consistent performance in right-hand thread direction, providing predictable and secure fastening in various setups.

Professional Applications & Engineering Value

This 1/4"-20 x 5" rounded head hex screw is engineered to address common industrial challenges such as corrosion, vibration loosening, and high-stress demands. Constructed from 18-8 Stainless Steel with a passivated finish, it offers excellent resistance to rust and chemicals, making it suitable for outdoor, marine, and chemical processing equipment. The UNC coarse threading and Class 3A fit ensure tight, precise engagements that minimize the risk of thread stripping under heavy loads. With full threading along its 5-inch length, it provides uniform clamping force in thick materials, while the hex drive and rounded button head facilitate quick assembly in confined spaces, reducing labor costs and enhancing project efficiency in machinery, construction, and automotive sectors.

Specification Summary & Compliance

This screw adheres to precise dimensional standards, including Class 3A thread fit for tight tolerances and UNC coarse threading (1/4"-20) as per ASME B18.3. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances. The manufacturing process meets industry specifications for Rockwell B55 hardness and 70,000 psi tensile strength, guaranteeing reliability in high-performance applications.