S-91257A658 3/8"-24 x 1 3/4" 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 strength for demanding applications with Grade 8 classification and 150,000 psi tensile strength
- Superior corrosion resistance provided by zinc yellow-chromate plating for extended service life
- Precise thread engagement with Class 2A thread fit ensuring reliable fastening performance
- Optimal torque transmission through external hex drive design for secure installation
- Enhanced vibration resistance from UNF fine thread spacing in right-hand configuration
- Reduced weight without compromising strength through partial threading design
- Industry 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 exceptional engineering value in heavy-duty industrial applications where reliability is paramount. The 3/8"-24 UNF fine thread configuration provides superior vibration resistance in machinery, automotive assemblies, and structural frameworks. The zinc yellow-chromate plating offers robust corrosion protection in challenging environments, while the Rockwell C33 hardness ensures maintained integrity under extreme loads. The external hex drive facilitates high-torque installation, making it ideal for construction equipment, manufacturing machinery, and transportation systems where 150,000 psi tensile strength is critical for safety and performance. The partial threading design optimizes weight distribution while maintaining full strength in the engaged section.
Specification Summary & Compliance
This Grade 8 hex head screw features precise Class 2A thread fit with 3/8"-24 UNF fine thread spacing and right-hand orientation. Manufacturing complies with ASME B18.2.1 and SAE J429 specifications, ensuring dimensional accuracy and performance reliability. The fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making it suitable for global industrial applications requiring strict regulatory adherence.
