S-91309A726 1/2"-13 x 3 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 that protects against rust and extends service life in demanding environments
- High tensile strength of 60,000 psi ensures reliable performance under heavy loads and vibration
- Class 2A thread fit provides consistent, easy assembly while maintaining secure fastening integrity
- Full threading along the entire 3 1/2" length allows for maximum adjustability and grip in various material thicknesses
- External hex drive design enables high-torque installation with standard tools for efficient assembly
- Rockwell B69 hardness delivers excellent durability and resistance to wear during repeated use
- Industry compliance with ASME B18.2.1, RoHS 3, and REACH standards ensures quality and environmental responsibility
Professional Applications & Engineering Value
These 1/2"-13 UNC hex head screws deliver exceptional engineering value across industrial applications where reliability is paramount. The steel construction with zinc plating addresses common corrosion challenges in manufacturing facilities, outdoor equipment, and structural assemblies. The coarse UNC thread pattern provides superior holding power in various materials while resisting vibration-induced loosening. With full threading along the entire 3 1/2" length, these fasteners accommodate varying material thicknesses without compromising clamping force. The external hex drive design allows for high-torque installation, making them ideal for heavy machinery, construction projects, and industrial equipment where access may be limited but secure fastening is critical.
Specification Summary & Compliance
This hex head screw features precise Class 2A thread fit tolerance per UNC standards, ensuring consistent engagement and reliable performance. Manufactured to ASME B18.2.1 specifications with material compliance to ASTM A307, these fasteners meet rigorous industrial requirements. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, confirming responsible manufacturing practices and material safety for global industrial applications.
