S-91257A653 3/8"-16 x 8 1/2" 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
- 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, extending service life in demanding environments
- Optimal hardness and durability with Rockwell C33 rating, maintaining structural integrity under heavy loads
- Precise thread engagement with Class 2A fit and UNC coarse threading for secure fastening and easy installation
- Heavy-duty Grade 8 classification ensuring consistent quality and performance in industrial applications
- Convenient external hex drive design allowing for straightforward installation with standard tools
- Partial threading configuration providing both threaded and unthreaded sections for versatile clamping applications
Professional Applications & Engineering Value
This Grade 8 hex head screw delivers exceptional engineering value for heavy machinery, structural assemblies, and industrial equipment where failure is not an option. The combination of 150,000 PSI tensile strength and Rockwell C33 hardness ensures reliable performance under extreme vibration and load conditions. The zinc yellow-chromate plating provides superior corrosion protection in harsh environments, while the 3/8"-16 UNC coarse threading with Class 2A fit guarantees precise engagement and resistance to loosening. The partially threaded design allows for optimal clamping force distribution, making it ideal for applications requiring both shear strength and tension control in construction, automotive, and manufacturing sectors.
Specification Summary & Compliance
This heavy-duty fastener features Class 2A thread fit tolerance with UNC coarse threading (3/8"-16) and partial threading configuration. Manufactured to exacting standards, it complies with ASME B18.2.1 and SAE J429 specifications for dimensional accuracy and mechanical properties. The 8 1/2" length with 1 1/4" minimum thread length provides versatile application capabilities while maintaining the structural integrity required for industrial fastening solutions.
