S-91670A624 3/8"-16 x 1" ASTM A574 Left-Hand Threaded Alloy Steel Socket Head Screws
Left-Hand Threaded Alloy Steel Socket Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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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.
- Left-hand thread design provides secure fastening in applications where right-hand rotation could cause loosening, such as rotating machinery components.
- Black-oxide coating on alloy steel offers corrosion resistance and a durable finish that withstands harsh industrial environments.
- Class 3A thread fit delivers precise, tight tolerances for superior engagement and vibration resistance in critical assemblies.
- Fully threaded body maximizes holding power and allows for adjustable positioning along the entire length.
- Hex socket drive enables high-torque installation with standard tools, preventing cam-out and ensuring efficient assembly.
- Rockwell C37 hardness maintains structural integrity under heavy loads, extending service life in demanding conditions.
Professional Applications & Engineering Value
This left-hand thread socket head cap screw is engineered to address critical challenges in industrial settings where reverse-threading prevents unintended loosening from rotational forces. Made from black-oxide alloy steel, it combines high tensile strength with corrosion resistance, ideal for machinery, automotive, and aerospace applications. The 3/8"-16 UNC coarse thread with Class 3A fit ensures quick assembly and reliable performance in high-vibration environments. Its fully threaded design provides uniform stress distribution, reducing the risk of shear failure. This screw meets rigorous standards, making it a trusted choice for engineers seeking durability and precision in industrial fasteners.
Specification Summary & Compliance
This screw adheres to precise dimensional standards with a Class 3A thread fit and UNC coarse threads for consistent performance. It complies with ASTM A574 specifications for high-strength bolts, ensuring material and manufacturing quality. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for global industrial use.
