S-91309A728 1/2"-13 x 4" ASME B18.2.1, ASTM A307 Low-Strength Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 60,000 psi tensile strength for reliable performance in demanding applications
• Superior corrosion resistance provided by zinc plating, extending service life in harsh industrial environments
• Easy installation and removal with standard external hex drive and 3/4" head width for common tool compatibility
• Optimal thread engagement through UNC coarse threading and Class 2A fit, ensuring secure fastening in various materials
• Full-length threading allows for maximum adjustability and consistent clamping force along the entire 4" length
• Enhanced durability from Rockwell B69 hardness, providing excellent resistance to wear and deformation
• Regulatory compliance assurance meeting ASME B18.2.1, ASTM A307, RoHS 3, and REACH standards for quality and safety

Professional Applications & Engineering Value

This heavy-duty hex head screw delivers critical engineering solutions for industrial applications requiring robust fastening performance. The combination of steel construction with zinc plating provides essential corrosion protection in manufacturing environments, construction projects, and machinery assembly. The UNC coarse thread design ensures rapid installation and superior holding power in wood, metal, and composite materials, while the external hex drive accommodates standard wrenches for efficient assembly and maintenance operations. With full threading along its 4" length, this fastener offers versatile positioning capabilities and consistent clamping force distribution, making it ideal for structural connections, equipment mounting, and heavy fabrications where vibration resistance and long-term reliability are paramount.

Specification Summary & Compliance

This 1/2"-13 hex head screw features precision Class 2A thread fit according to UNC standards, ensuring proper engagement and interchangeability. Manufactured to ASME B18.2.1 dimensional specifications and ASTM A307 material requirements, the fastener delivers consistent quality and performance. The product maintains compliance with RoHS 3 (2015/863/EU) for restricted substance control and REACH (EC 1907/2006) regulations, confirming environmental responsibility and workplace safety standards for industrial procurement.