S-91670A146 6-32 x 3/8" 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 under high-stress conditions, reducing the risk of fastener failure.
• Superior corrosion resistance from the black-oxide finish on alloy steel, extending service life in harsh industrial environments.
• Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant connections in critical assemblies.
• Left-hand UNC coarse threading offers reliable fastening in reverse-thread applications, preventing loosening from counter-clockwise motion.
• Fully threaded design allows for maximum grip and adjustability across the entire length, enhancing versatility in various setups.
• Hex socket drive enables easy installation and removal with standard tools, minimizing assembly time and effort.
• Compliance with ASTM A574, RoHS 3, and REACH ensures material consistency, environmental safety, and suitability for regulated industries.

Professional Applications & Engineering Value

This 6-32 UNC left-hand thread socket head cap screw is engineered to address common challenges in reverse-thread mechanisms, such as those in rotating equipment, where standard right-hand threads may loosen under specific directional forces. The black-oxide alloy steel construction, combined with a Rockwell C37 hardness rating, provides excellent durability and resistance to wear and corrosion, making it ideal for demanding environments like automotive, aerospace, and heavy machinery. The coarse thread and Class 3A fit ensure quick assembly and reliable clamping force, reducing maintenance needs and downtime. Its fully threaded design offers consistent holding power, while the hex drive allows for secure tool engagement, preventing stripping and ensuring efficient installation in confined spaces.

Specification Summary & Compliance

This screw adheres to precise dimensional standards, including a Class 3A thread fit for superior accuracy and UNC coarse threads for robust engagement. It meets ASTM A574 specifications for high-strength alloy steel socket head cap screws, ensuring consistent material and mechanical properties. Additionally, it is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), confirming its safety for use in environments with strict environmental and health regulations.