S-91309A541 1/4"-20 x 7/8" ASME B18.2.1, ASTM A307 Low-Strength Steel Hex Head Screws
Low-Strength Steel Hex 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 corrosion resistance with zinc plating that protects against rust in demanding industrial environments
- Superior tensile strength rated at 60,000 psi for reliable performance in high-stress applications
- Optimized thread engagement with Class 2A UNC coarse threads ensuring secure fastening and vibration resistance
- Enhanced durability from Rockwell B69 hardness steel that maintains integrity under repeated loading
- Efficient installation through external hex drive design allowing quick assembly with standard tools
- Full threading coverage along the 7/8" length providing maximum grip strength across the entire fastener
- Regulatory compliance meeting ASME B18.2.1, RoHS 3, and REACH standards for global industrial acceptance
Professional Applications & Engineering Value
This 1/4"-20 UNC hex head screw delivers critical engineering solutions for industrial assembly challenges. The zinc plated steel construction provides essential corrosion protection in manufacturing environments where moisture and chemicals are present. The coarse UNC threading with Class 2A fit ensures rapid installation while maintaining secure connections in vibrating machinery and structural applications. With full threading along the 7/8" length, this fastener distributes clamping force evenly, preventing joint failure in heavy equipment, machinery frames, and structural steel connections. The external hex drive enables high-torque installation without stripping, making it ideal for production lines requiring efficient, reliable fastening solutions.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Class 2A thread fit and UNC coarse threading (1/4"-20) in the inch system. Complies with ASME B18.2.1 specifications where identified with ASTM A307 material standards. Meets RoHS 3 (2015/863/EU) compliance for restricted substances and REACH (EC 1907/2006) environmental regulations. Features include right-hand thread direction, external hex drive, 7/16" head width, and full threading across the 7/8" length.
