S-91286A471 3/4"-10 x 4" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws
High-Strength Grade 8 Steel Hex Head Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Maximum load-bearing capacity with Grade 8 classification and 150,000 psi tensile strength for critical structural applications
- Superior corrosion protection through zinc-flake coating that withstands harsh industrial environments
- Optimized thread engagement with UNC coarse threading and Class 2A fit for faster assembly and reliable performance
- Enhanced torque transmission via external hex drive design that prevents tool slippage during installation
- Precise load distribution through partially threaded shank design that concentrates strength where needed most
- Exceptional durability with Rockwell C33 hardness that maintains integrity under repeated stress cycles
- Industry-standard compatibility meeting ASME B18.2.1 and SAE J429 specifications for reliable interchangeability
Professional Applications & Engineering Value
This Grade 8 hex head screw delivers critical performance where high tensile strength and corrosion resistance are paramount. The 3/4"-10 UNC coarse threading provides superior engagement in structural steel applications, while the zinc-flake coating offers exceptional protection against environmental degradation in industrial settings. The partially threaded design ensures optimal clamp load distribution, making it ideal for heavy machinery, construction equipment, and structural frameworks where vibration resistance and long-term reliability are essential. With external hex drive compatibility, installation torque is efficiently transferred without cam-out concerns, reducing assembly time and improving workplace safety.
Specification Summary & Compliance
Manufactured to precise Class 2A thread fit tolerances with UNC coarse threading standards. Complies with ASME B18.2.1 and SAE J429 specifications for dimensional accuracy and mechanical properties. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards, ensuring safe use across regulated industries. The 4" length with 1 3/4" minimum thread length provides consistent engagement depth for reliable fastening performance.
