S-91257A703 7/16"-20 x 2 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 load-bearing capacity with 150,000 psi tensile strength for reliable performance in high-stress applications
- Superior corrosion resistance through zinc yellow-chromate plating that protects against harsh industrial environments
- Precise thread engagement with UNF fine threading and Class 2A fit ensuring secure fastening and vibration resistance
- Optimized strength-to-weight ratio featuring Grade 8 steel construction with Rockwell C33 hardness for maximum durability
- Enhanced installation efficiency with external hex drive design allowing for high torque application and easy installation
- Strategic material distribution through partially threaded design that concentrates strength where needed most
- Industry compliance assurance meeting ASME B18.2.1 and SAE J429 specifications for guaranteed performance standards
Professional Applications & Engineering Value
These Grade 8 hex head screws deliver critical engineering solutions for heavy machinery, structural assemblies, and industrial equipment where failure is not an option. The 7/16"-20 UNF fine threading provides superior resistance to vibrational loosening in dynamic applications, while the zinc yellow-chromate plating creates a robust barrier against corrosion in demanding environments. The partially threaded design concentrates the high 150,000 psi tensile strength precisely where shear forces are greatest, making these industrial fasteners ideal for critical joints in construction equipment, automotive systems, and manufacturing machinery. The external hex drive accommodates high torque requirements during installation, ensuring proper clamping force without stripping.
Specification Summary & Compliance
Manufactured to precise Class 2A thread fit tolerances with 7/16"-20 UNF fine threading in accordance with ASME B18.2.1 and SAE J429 specifications. These inch system screws feature a length of 2 3/4" with minimum thread length of 1 1/8". Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations ensures safe use across global markets.
