S-91257A652 3/8"-16 x 8" 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
- Maximum load-bearing capacity with 150,000 psi tensile strength and Grade 8 classification for demanding industrial applications
- Superior corrosion protection through zinc yellow-chromate plating that withstands harsh environmental conditions
- Optimized clamping performance with partially threaded 3/8"-16 UNC coarse thread design for secure fastening in heavy machinery
- Exceptional durability backed by Rockwell C33 hardness rating that resists wear and deformation under stress
- Precise thread engagement with Class 2A thread fit ensuring consistent installation and reliable performance
- Easy installation and removal using standard tools thanks to the external hex drive and 9/16" head width
- Regulatory compliance assurance meeting ASME B18.2.1, SAE J429 standards plus RoHS 3 and REACH environmental directives
Professional Applications & Engineering Value
This Grade 8 hex head screw delivers critical engineering solutions for heavy-duty assembly where vibration resistance and structural integrity are paramount. The 3/8"-16 UNC coarse thread configuration provides superior grip in steel frameworks, construction equipment, and industrial machinery, while the partial threading design concentrates clamping force where needed most. The zinc yellow-chromate plating creates a protective barrier against corrosion in outdoor applications or harsh manufacturing environments. With 150,000 psi tensile strength and Rockwell C33 hardness, these industrial hex screws maintain fastener integrity under extreme loads, preventing joint failure in critical applications from structural steel connections to heavy equipment maintenance.
Specification Summary & Compliance
Manufactured to precise Class 2A thread fit tolerances with 3/8"-16 UNC coarse thread specifications. Complies with ASME B18.2.1 and SAE J429 standards for dimensional accuracy and mechanical properties. Meets environmental regulations including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) requirements. The 8" length with 1 1/4" minimum thread length ensures proper engagement in various material thicknesses.
