S-91236A593 5/16"-18 x 2 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 corrosion resistance with zinc plating for extended service life in demanding industrial environments
- High tensile strength of 60,000 psi ensures reliable performance in heavy-duty applications
- Rockwell B69 hardness provides excellent durability and resistance to wear
- External hex drive design allows for easy installation with standard tools and high torque application
- UNC coarse threading enables faster assembly and better performance in softer materials
- Class 2A thread fit ensures consistent, reliable engagement while maintaining installation efficiency
- Partial threading provides optimal grip length while reducing material usage and weight
Professional Applications & Engineering Value
This 5/16"-18 UNC hex head screw delivers exceptional engineering value through its steel construction and zinc plating, specifically designed to address common industrial fastening challenges. The combination of 60,000 psi tensile strength and Rockwell B69 hardness ensures reliable performance in structural applications, machinery assembly, and heavy equipment where vibration resistance is critical. The coarse UNC threading provides superior holding power in various materials while resisting loosening under dynamic loads. The external hex drive configuration allows for high torque application, making it ideal for maintenance operations and production lines where installation speed and reliability are paramount. This fastener solves durability concerns while maintaining compliance with industry standards for quality-conscious engineering teams.
Specification Summary & Compliance
This hex head screw maintains precise Class 2A thread fit tolerances according to UNC standards, ensuring consistent performance across applications. Manufactured to meet ASME B18.2.1 specifications with material compliance to ASTM A307. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming environmental responsibility and safety standards. Critical dimensions include 2-1/2" length with 7/8" minimum thread engagement, providing optimal fastening capability while maintaining structural integrity.
