S-91236A721 1/2"-13 x 2 1/4" 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 demanding 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 during installation and use
- Class 2A thread fit offers optimal assembly clearance for faster installation while maintaining secure fastening
- External hex drive with 3/4" head width allows for high torque application using standard tools
- Coarse UNC threading enables quick engagement and reduced cross-threading risk in various materials
- Partial threading design provides unthreaded shank for enhanced shear strength in structural applications
Professional Applications & Engineering Value
This 1/2"-13 UNC hex head screw delivers exceptional engineering value for industrial fastening applications where reliability is critical. The zinc plated steel construction provides essential corrosion protection for machinery, structural steel connections, and equipment assembly in manufacturing facilities. The coarse thread design ensures rapid installation in steel frames, construction projects, and heavy equipment maintenance while minimizing thread stripping. With 2-1/4" length and partial threading, this fastener offers optimal clamp load distribution for joining multiple material thicknesses. The external hex drive accommodates high torque requirements in confined spaces, making it ideal for maintenance operations and production line applications where speed and reliability are paramount.
Specification Summary & Compliance
This hex head screw features Class 2A thread fit per UNC standards with 1/2"-13 coarse thread specification and 2-1/4" length. Manufactured to ASME B18.2.1 dimensional requirements and ASTM A307 material specifications, ensuring consistent quality and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making it suitable for global industrial applications with strict compliance requirements.
