S-91257A659 3/8"-24 x 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 for demanding applications
- Superior corrosion resistance through zinc yellow-chromate plating, extending service life in harsh environments
- Reliable thread engagement with Class 2A thread fit ensuring precise assembly and vibration resistance
- Optimized torque transmission via external hex drive design for secure fastening with standard tools
- Enhanced fatigue resistance from Rockwell C33 hardness, maintaining integrity under repeated stress
- Versatile partial threading allowing unthreaded shank sections for shear strength in structural connections
- Regulatory compliance assurance meeting ASME B18.2.1, SAE J429, RoHS 3, and REACH standards
Professional Applications & Engineering Value
This Grade 8 hex head screw delivers critical performance in heavy machinery, construction equipment, and automotive assemblies where high tensile strength and corrosion resistance are paramount. The 3/8"-24 UNF fine thread configuration provides superior clamping force distribution while the zinc yellow-chromate plating creates a sacrificial barrier against oxidation and chemical exposure. Engineers specify this partially threaded fastener for applications requiring both threaded engagement strength and unthreaded shank shear resistance. The external hex drive design ensures reliable torque application in confined spaces, making it ideal for structural connections, engine components, and industrial equipment requiring ASME B18.2.1 compliance and long-term durability.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Class 2A thread fit tolerance and UNF fine thread profile (3/8"-24). This 2" length hex head screw features partial threading with minimum 1" thread length. Complies with ASME B18.2.1 and SAE J429 specifications for Grade 8 fasteners, alongside environmental regulations including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance for restricted substance control.
