S-91236A560 1/4"-20 x 4 1/2" 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 load-bearing capacity with 60,000 psi tensile strength for reliable performance in demanding applications
- Enhanced corrosion resistance through zinc plating, extending service life in various industrial environments
- Optimized thread engagement with UNC coarse threads and Class 2A fit for faster assembly and vibration resistance
- Robust material properties featuring Rockwell B69 hardness steel for excellent durability and wear resistance
- Secure external hex drive design for high-torque installation using standard tools without stripping
- Strategic partial threading providing both gripping strength and clearance where needed along the 4½" length
- Regulatory compliance assurance meeting ASME B18.2.1, ASTM A307, RoHS 3 and REACH standards
Professional Applications & Engineering Value
This heavy-duty hex head screw delivers exceptional engineering value across industrial applications where vibration resistance and structural integrity are paramount. The steel construction with Rockwell B69 hardness provides reliable performance in machinery assembly, structural frameworks, and equipment manufacturing. The zinc plated finish offers crucial corrosion protection in environments exposed to moisture or chemicals, while the 1/4"-20 UNC coarse thread configuration ensures rapid installation and maintains clamping force under dynamic loads. The external hex drive accommodates high torque applications without cam-out, and the partial threading design allows for precise load distribution. These industrial hex bolts solve critical fastening challenges by combining strength, corrosion resistance, and compliance with major industry standards.
Specification Summary & Compliance
This fastener maintains Class 2A thread fit per UNC standards with precise dimensional accuracy. Manufacturing follows ASME B18.2.1 specifications and ASTM A307 material requirements. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory acceptance for industrial use worldwide.
