S-91670A544 1/4"-20 x 1 1/4" ASTM A574 Left-Hand Threaded Alloy Steel Socket Head Screws
Left-Hand Threaded Alloy Steel Socket Head Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
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 provided by the black-oxide finish on alloy steel, extending service life in demanding industrial environments.
- Precise Class 3A thread fit guarantees secure, vibration-resistant connections, minimizing loosening in critical assemblies.
- Left-hand UNC coarse threading offers specialized fastening solutions for applications requiring reverse-thread security.
- High hardness rating (Rockwell C37) enhances wear resistance and durability, maintaining integrity through repeated use.
- Full-threaded design allows for consistent engagement along the entire length, providing uniform clamping force.
- Compliance with ASTM A574 and environmental standards ensures material quality and adherence to RoHS 3 and REACH regulations for safe usage.
Professional Applications & Engineering Value
Engineered for high-performance industrial settings, this black-oxide alloy steel socket head cap screw addresses common challenges like vibration-induced loosening and corrosion. The left-hand UNC thread is ideal for specialized machinery where reverse threading prevents unintended disassembly, while the coarse thread facilitates quick installation in tough materials. With a 170,000 psi tensile strength and Rockwell C37 hardness, it withstands extreme loads and abrasion, making it suitable for heavy-duty equipment, automotive systems, and aerospace components. The socket head design with a 3/16" hex drive allows for easy access in confined spaces, enhancing assembly efficiency without compromising on durability or compliance.
Specification Summary & Compliance
This screw features a 1/4"-20 UNC left-hand thread with Class 3A fit, ensuring precise dimensional accuracy and reliable performance. It is manufactured in accordance with ASTM A574 specifications and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental safety and material integrity for industrial use.
