S-91309A727 1/2"-13 x 3 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 stress
- Rockwell B69 hardness provides excellent durability and resistance to wear and deformation
- Class 2A thread fit with UNC coarse threads enables quick assembly and secure fastening
- External hex drive design allows for easy installation and removal with standard tools
- Full threading along the 3 3/4" length offers maximum grip and uniform load distribution
- Compliance with ASME B18.2.1 and ASTM A307 standards guarantees consistent quality and engineering reliability
Professional Applications & Engineering Value
This heavy-duty hex head screw is engineered to address critical challenges in industrial and construction settings, where vibration, high stress, and environmental exposure can compromise fastener integrity. The steel material combined with zinc plating provides robust corrosion resistance, making it ideal for outdoor machinery, structural assemblies, and equipment subjected to moisture or chemicals. The UNC coarse thread and Class 2A fit ensure quick, reliable installation with reduced risk of cross-threading, while the external hex drive facilitates efficient torque application. With a 60,000 psi tensile strength and full threading, it delivers secure, long-lasting performance in demanding applications like heavy equipment manufacturing, infrastructure projects, and industrial maintenance, minimizing downtime and replacement costs.
Specification Summary & Compliance
This fastener features precise Class 2A thread fit with UNC coarse threads (1/2"-13 size) and adheres to ASME B18.2.1 and ASTM A307 manufacturing standards for dimensional accuracy and performance. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and suitability for global industrial use.
