S-91309A544 1/4"-20 x 1 1/4" ASME B18.2.1, ASTM A307 Low-Strength Steel Hex Head Screws
Low-Strength Steel Hex 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
- Superior corrosion resistance with zinc plating that protects against rust and extends service life in harsh environments
- High tensile strength of 60,000 psi ensures reliable, durable fastening for demanding industrial applications
- Coarse UNC threads with Class 2A fit provide quick, easy assembly and excellent grip in various materials
- Fully threaded design offers maximum holding power along the entire screw length for secure connections
- External hex drive and hex head enable high-torque installation with standard tools, reducing assembly time
- Rockwell B69 hardness maintains structural integrity under stress, preventing deformation during tightening
- Compliance with RoHS 3 and REACH ensures environmental safety and meets international regulatory standards
Professional Applications & Engineering Value
This 1/4"-20 x 1-1/4" hex head screw is engineered to address critical fastening challenges in industrial settings. The steel construction combined with zinc plating provides excellent corrosion resistance, making it ideal for outdoor equipment, machinery, and structural assemblies exposed to moisture. The UNC coarse thread design ensures rapid installation and superior pull-out resistance in wood, metal, and composite materials, reducing labor costs and minimizing thread stripping. With its fully threaded body and external hex drive, it delivers consistent clamping force and allows for high-torque applications in automotive, construction, and manufacturing sectors where vibration resistance and long-term reliability are paramount.
Specification Summary & Compliance
This screw features precise Class 2A thread fit per UNC standards, ensuring consistent engagement and interchangeability. Manufactured to ASME B18.2.1 specifications with material meeting ASTM A307, it guarantees dimensional accuracy and performance reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming adherence to environmental and safety standards for global industrial use.
