S-91257A660 3/8"-24 x 2 1/4" 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 tensile strength of 150,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
- Superior corrosion resistance from zinc yellow-chromate plating extends service life in harsh industrial environments.
- High hardness rating (Rockwell C33) provides excellent wear resistance and durability under repetitive loads.
- Precise Class 2A thread fit with UNF fine threading offers secure, vibration-resistant connections in critical assemblies.
- Partially threaded design allows for optimal clamping force distribution and prevents thread damage during installation.
- External hex drive enables easy installation and removal with standard tools, improving maintenance efficiency.
- Full regulatory compliance with ASME, SAE, RoHS 3, and REACH standards ensures safety and environmental responsibility.
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, this Grade 8 hex head screw delivers critical performance where reliability is non-negotiable. The steel construction combined with zinc yellow-chromate plating provides robust protection against corrosion in demanding environments like machinery, construction equipment, and automotive assemblies. The 3/8"-24 UNF fine thread configuration ensures superior resistance to loosening under vibration, while the partial threading design concentrates clamping force precisely where needed. These industrial fasteners solve common engineering challenges by maintaining integrity under extreme loads, meeting rigorous ASME B18.2.1 specifications for dimensional accuracy and performance consistency.
Specification Summary & Compliance
This fastener features Class 2A thread fit tolerance with UNF fine threading (3/8"-24) in right-hand direction, manufactured to ASME B18.2.1 and SAE J429 standards. The 2-1/4" length with 1" minimum thread length provides versatile fastening capability. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global markets.
