S-91236A803 5/8"-11 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 protection 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 and deformation
- Coarse UNC thread design enables faster installation and better performance in softer materials
- Class 2A thread fit guarantees consistent, reliable connections with standard nuts
- Partially threaded shank allows for precise clamping force distribution in assembled components
- External hex drive design facilitates easy installation with standard wrenching tools
Professional Applications & Engineering Value
This 5/8"-11 UNC hex head screw delivers exceptional engineering value for heavy-duty industrial applications where reliability is critical. The steel construction with zinc plating provides robust corrosion resistance, making it ideal for outdoor equipment, structural assemblies, and machinery exposed to harsh environments. The coarse thread pattern ensures secure fastening in wood, soft metals, and composite materials, while the partially threaded design prevents joint loosening under dynamic loads. With its external hex drive and standardized dimensions, this fastener enables quick installation and maintenance, reducing assembly time and labor costs in manufacturing, construction, and equipment maintenance operations.
Specification Summary & Compliance
This hex head screw features Class 2A thread fit tolerance ensuring compatibility with standard nuts and threaded components. Manufactured to ASME B18.2.1 specifications with ASTM A307 material standards, it guarantees dimensional accuracy and mechanical 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 requiring strict regulatory adherence.
