S-91670A148 6-32 x 1/2" ASTM A574 Left-Hand Threaded Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
• Precise Class 3A thread fit provides superior engagement and vibration resistance, minimizing loosening in dynamic environments.
• Black-oxide coating on alloy steel offers enhanced corrosion resistance, extending service life in demanding industrial conditions.
• Left-hand thread design allows for specialized applications where reverse threading is required to prevent unintended loosening.
• Fully threaded body ensures consistent clamping force along the entire length, improving joint integrity.
• Hex socket drive (7/64") enables high-torque installation with standard tools, facilitating efficient assembly and maintenance.
• Rockwell C37 hardness provides excellent wear resistance, maintaining thread integrity through repeated use.

Professional Applications & Engineering Value

This 6-32 UNC left-hand thread socket head cap screw is engineered to address critical challenges in machinery, automotive, and aerospace applications where reverse-threading requirements and high vibration environments are common. The black-oxide alloy steel construction combined with Class 3A thread fit ensures secure fastening in assemblies subject to rotational forces that would cause standard right-hand threads to loosen. The coarse UNC thread pattern provides rapid installation while maintaining holding power, and the fully threaded design distributes clamping force evenly across the entire engagement length. These socket head cap screws deliver reliable performance in precision equipment, manufacturing fixtures, and maintenance applications where access space is limited and high-strength fasteners are essential.

Specification Summary & Compliance

Manufactured to ASTM A574 specifications with Class 3A thread fit tolerance for precision engagement. Features UNC coarse threads in left-hand direction with 6-32 thread size and 1/2" length. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors.