S-91236A888 7/8"-9 x 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 resistance with zinc plating, extending service life in demanding industrial environments
- High-strength steel construction with 60,000 psi tensile strength for reliable load-bearing in heavy-duty applications
- Rockwell B69 hardness ensures excellent wear resistance and durability under mechanical stress
- Coarse UNC threading provides faster assembly and reduced cross-threading risk in coarse materials
- Class 2A thread fit offers consistent, reliable engagement with standard nuts and threaded holes
- External hex drive design allows for high-torque installation using common wrench tools
- Partial threading optimizes grip length while maintaining unthreaded shank strength
Professional Applications & Engineering Value
This heavy-duty hex head screw delivers exceptional performance in structural applications where vibration resistance and mechanical stability are critical. The combination of high-strength steel and zinc plating addresses common industrial challenges including corrosion in outdoor or humid environments, while maintaining the 60,000 psi tensile strength required for structural connections. The 7/8"-9 UNC coarse thread configuration ensures rapid installation in steel frameworks, construction equipment, and machinery assemblies, with the external hex drive accommodating standard tools for efficient maintenance and disassembly. The partially threaded design concentrates thread engagement where needed most, preventing stress concentration in the threaded portion while providing maximum unthreaded shank strength for shear load applications.
Specification Summary & Compliance
This 4" length hex head screw features precise Class 2A thread fit per UNC standards with 2" minimum thread length. Manufactured to ASME B18.2.1 dimensional specifications using ASTM A307 grade steel. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors.
