S-90299A537 1/4"-20 x 1/2" ASME B18.3, ASTM A574 Brass-Tip Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 180,000 psi ensures reliable performance under high-stress conditions, reducing the risk of fastener failure.
• Non-marring brass tip protects sensitive surfaces from scratches and damage during installation and use, ideal for finished products.
• Precise Class 3A thread fit provides superior engagement and vibration resistance, minimizing loosening in dynamic applications.
• Black-oxide finish on alloy steel offers enhanced corrosion resistance and a durable, low-reflectivity surface for harsh environments.
• Hex socket drive design allows for high torque application and easy installation in confined spaces with standard tools.
• Full threading ensures consistent clamping force along the entire length, improving load distribution.
• Compliance with ASME B18.3, RoHS 3, and REACH guarantees adherence to industry standards and environmental regulations for safe, global use.

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw is engineered to address critical industrial fastening challenges, such as maintaining integrity under extreme loads and preventing surface marring on assembled components. The 1/4"-20 UNC coarse thread and Class 3A fit deliver excellent holding power and resistance to vibration, making it suitable for machinery, automotive, and aerospace applications where reliability is paramount. The non-marring brass tip is particularly valuable in electronics and precision equipment assembly, eliminating damage to delicate parts. With a Rockwell C39 hardness and robust alloy steel construction, it withstands repetitive stress and harsh conditions, reducing maintenance needs and downtime.

Specification Summary & Compliance

This screw features a 1/4"-20 UNC thread with Class 3A precision tolerances for optimal fit. It is manufactured in accordance with ASME B18.3 specifications and meets ASTM A574 material standards. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free of hazardous substances and safe for various industrial and international markets.