S-91309A580 5/16"-18 x 5/8" 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, extending service life in harsh 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
- Class 2A thread fit offers consistent, reliable engagement for secure fastening
- Fully threaded design allows for maximum grip and holding power along the entire length
- External hex drive enables easy installation with standard tools and high torque application
- Compliance with multiple standards including ASME B18.2.1, RoHS 3, and REACH ensures quality and environmental responsibility
Professional Applications & Engineering Value
These 5/16"-18 UNC hex head screws deliver exceptional engineering value for demanding industrial applications. The steel construction with zinc plating provides superior protection against corrosion, making them ideal for outdoor equipment, machinery, and structural assemblies exposed to environmental elements. The coarse UNC thread pattern ensures quick installation and reliable performance in materials where fine threads might strip or fail. With full threading along the entire 5/8" length, these fasteners distribute clamping force evenly, preventing joint loosening under vibration and dynamic loads. The external hex drive design allows for high torque application, ensuring secure fastening in critical assemblies where reliability is paramount for operational safety and longevity.
Specification Summary & Compliance
Manufactured to precise Class 2A thread fit tolerances with UNC coarse threading (5/16"-18), these screws meet ASME B18.2.1 specifications and ASTM A307 grade requirements. The inch system measurements ensure compatibility with North American equipment and standards. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming these fasteners are free from restricted substances and suitable for global industrial applications.
