S-91251A916 1"-8 x 3" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi ensures reliable performance in high-stress industrial applications.
• Superior corrosion resistance from the black-oxide finish, extending service life in demanding environments.
• Precise Class 3A thread fit guarantees secure, vibration-resistant connections with minimal risk of loosening.
• High torque capability with the 3/4" hex drive, allowing for easy installation and removal with standard tools.
• Durable alloy steel construction with Rockwell C37 hardness provides excellent wear resistance and long-term reliability.
• Full threading along the 3" length offers versatile fastening depth and uniform load distribution.
• Compliance with ASTM A574, RoHS 3, and REACH ensures quality, safety, and environmental standards are met.

Professional Applications & Engineering Value

This socket head cap screw is engineered to address critical challenges in heavy machinery, automotive assembly, and construction equipment, where high-strength fastening is essential. The black-oxide alloy steel material combats rust and wear, while the Class 3A UNRC coarse thread ensures quick assembly and robust hold in coarse-grained materials. Its fully threaded design and 170,000 psi tensile strength provide consistent clamping force, reducing the risk of joint failure under dynamic loads. Ideal for applications requiring reliable, industrial-grade screws, this fastener delivers durability and precision in environments prone to vibration and high stress.

Specification Summary & Compliance

This product features a 1"-8 UNRC coarse thread with Class 3A fit for precise tolerance, and is manufactured to meet ASTM A574 specifications. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring adherence to environmental and safety standards for industrial use.