S-91257A700 7/16"-20 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 load-bearing capacity with 150,000 PSI tensile strength for reliable performance in high-stress applications
- Superior corrosion resistance provided by zinc yellow-chromate plating, extending service life in demanding environments
- Optimized torque transmission through the external hex drive design, ensuring secure installation and removal
- Precise thread engagement with Class 2A thread fit and UNF fine threading for vibration resistance and secure fastening
- Enhanced durability from Rockwell C33 hardness, maintaining structural integrity under repeated loads
- Versatile partial threading allowing for both clamping and alignment functions in assembly applications
- Regulatory compliance assurance meeting ASME B18.2.1 standards for consistent quality and performance
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, this Grade 8 hex head screw delivers exceptional reliability in construction equipment, machinery assembly, and structural frameworks where high tensile strength is critical. The zinc yellow-chromate plated steel construction provides superior corrosion protection, significantly extending service life in harsh environments. The 7/16"-20 UNF fine threading ensures precise thread engagement and superior vibration resistance, while the external hex drive facilitates efficient installation with standard tools. The partial threading design offers optimal clamping force distribution, making it ideal for applications requiring both secure fastening and alignment capabilities. These industrial hex bolts are specifically designed to withstand extreme mechanical stresses while maintaining dimensional stability.
Specification Summary & Compliance
This inch system fastener features precise Class 2A thread fit with 7/16"-20 UNF fine threading and partial threading up to 1 1/8" minimum thread length. Manufactured to ASME B18.2.1 specifications SAE J429, ensuring dimensional accuracy and performance consistency. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant (01/17/2023 233 SVHC), meeting international environmental and safety standards for industrial use.
