S-91309A553 1/4"-20 x 2 3/4" 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 demanding environments
- High tensile strength of 60,000 psi ensures reliable performance under heavy loads and vibration, reducing failure risks
- Rockwell B69 hardness provides excellent durability and resistance to wear during installation and use
- Coarse UNC threads with Class 2A fit offer faster assembly and easier alignment, saving time in industrial applications
- External hex drive design allows for high torque application with standard tools, ensuring secure fastening
- Full threading along the 2 3/4" length enables consistent grip and adjustability across the entire fastener
- Compliance with ASME B18.2.1 and ASTM A307 guarantees consistent quality and interoperability in mechanical systems
Professional Applications & Engineering Value
This 1/4"-20 UNC hex head screw is engineered to address common industrial challenges such as joint integrity and environmental exposure. Constructed from steel and finished with zinc plating, it combats corrosion in humid or outdoor settings, making it ideal for machinery, structural frames, and equipment assembly. The coarse thread design resists loosening under vibration, while the external hex drive facilitates quick installation with standard wrenches, reducing labor time. Fully threaded for uniform load distribution, it meets rigorous standards like ASME B18.2.1, ensuring reliability in heavy-duty applications where safety and durability are paramount.
Specification Summary & Compliance
This screw features a 1/4"-20 UNC coarse thread with Class 2A thread fit for standard tolerance and easy assembly. It complies with ASME B18.2.1 and ASTM A307 specifications, ensuring dimensional accuracy and mechanical properties. Additionally, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, supporting sustainable and safe usage in global markets.
