S-92949A558 1/4"-20 x 4" 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 environments and long-term reliability.
• High tensile strength of 70,000 PSI ensures dependable performance under heavy loads and mechanical stress.
• Precise Class 3A thread fit provides secure, vibration-resistant assemblies with minimal risk of loosening.
• Easy installation and removal using a standard 5/32" hex drive, reducing assembly time and tool wear.
• Fully threaded design offers consistent clamping force along the entire 4" length for uniform load distribution.
• Rounded (button) head style delivers a low-profile, finished appearance while reducing snagging risks.
• Compliance with ASME B18.3, RoHS, and REACH guarantees quality, safety, and environmental standards for industrial use.

Professional Applications & Engineering Value

This 1/4"-20 UNC coarse thread screw is engineered to address critical challenges in industrial fastening, such as vibration-induced loosening and corrosion in demanding settings. The 18-8 Stainless Steel construction, enhanced by a passivated finish, provides exceptional resistance to rust and chemical exposure, making it suitable for outdoor machinery, marine equipment, and food processing applications. The rounded head with hex drive ensures easy access in confined spaces, while the Class 3A thread fit maintains tight tolerances for secure connections in high-stress assemblies. Its fully threaded 4" length allows for adjustable grip in structural frameworks, conveyor systems, and heavy-duty manufacturing, delivering reliable performance where durability and precision are paramount.

Specification Summary & Compliance

This screw features a 1/4"-20 UNC coarse thread with Class 3A fit for precise dimensional accuracy, ensuring consistent engagement and load distribution. It adheres to ASME B18.3 manufacturing specifications, providing reliable mechanical properties including a tensile strength of 70,000 psi and Rockwell B55 hardness. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, supporting safe and sustainable industrial use.