S-91309A540 1/4"-20 x 3/4" 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
- Superior corrosion resistance with zinc plating, extending service life in harsh industrial environments
- High tensile strength of 60,000 psi ensures reliable performance under heavy loads and vibration
- Rockwell B69 hardness provides excellent durability and resistance to wear and deformation
- Coarse UNC threading with Class 2A fit enables quick installation and secure fastening in various materials
- External hex drive design allows for high torque application using standard tools
- Full threading along the 3/4" length maximizes grip strength and load distribution
- Compliance with major regulations including RoHS 3 and REACH ensures environmental and safety standards are met
Professional Applications & Engineering Value
This 1/4"-20 hex head screw delivers exceptional engineering value across industrial applications where reliability is critical. The steel construction with zinc plating provides robust protection against corrosion in manufacturing, construction, and machinery assembly environments. The coarse UNC thread design ensures superior performance in softer materials and applications requiring frequent disassembly, while the external hex drive enables efficient installation with common tools. With its fully threaded configuration and 60,000 psi tensile strength, this fastener maintains structural integrity in high-stress applications, from equipment frames to structural connections, reducing maintenance needs and downtime.
Specification Summary & Compliance
This hex head screw features precision UNC coarse threading with Class 2A fit for consistent engagement and reliable performance. Manufactured to ASME B18.2.1 specifications using ASTM A307 grade steel, ensuring dimensional accuracy and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting current environmental and safety standards for industrial components.
