S-91257A737 1/2"-13 x 6 1/2" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws
High-Strength Grade 8 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
- Exceptional load-bearing capability with 150,000 psi tensile strength, ideal for high-stress structural connections
- Superior corrosion protection through zinc yellow-chromate plating, extending service life in harsh environments
- Optimized torque transmission with external hex drive and 3/4" head width for secure installation
- Reliable thread engagement with Class 2A fit and coarse UNC threading, preventing cross-threading in industrial assemblies
- Controlled thread distribution through partial threading, providing enhanced grip in critical joint sections
- Consistent mechanical performance with Rockwell C33 hardness, maintaining dimensional stability under heavy loads
- Industry-standard compatibility meeting ASME B18.2.1 and SAE J429 specifications for engineering applications
Professional Applications & Engineering Value
Engineered for demanding industrial applications, these Grade 8 hex head screws deliver critical performance where structural integrity is paramount. The 1/2"-13 UNC coarse thread configuration ensures rapid installation and superior resistance to vibration loosening in heavy machinery, construction equipment, and transportation systems. The zinc yellow-chromate plating creates a protective barrier against chemical exposure and atmospheric corrosion, significantly reducing maintenance intervals in manufacturing plants and outdoor installations. With partial threading optimizing stress distribution along the shank, these steel fasteners prevent joint failure in high-vibration environments while the external hex drive accommodates high-torque applications common in industrial maintenance and assembly operations.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Class 2A thread fit tolerance and 1/2"-13 UNC coarse thread specifications. Complies with ASME B18.2.1 and SAE J429 mechanical requirements for Grade 8 fasteners. Meets environmental regulations including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance standards for industrial use.
