S-91286A373 1/2"-20 x 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 tensile strength of 150,000 psi ensures reliable performance in high-stress industrial applications
- Superior corrosion resistance from zinc-flake coating extends service life in harsh environments
- Precise Class 2A thread fit provides consistent engagement and reduces installation issues
- Grade 8 strength classification guarantees maximum durability for heavy-duty fastening requirements
- External hex drive design enables high-torque installation with standard tools
- Partially threaded configuration allows for optimal clamping force distribution
- UNF fine threading delivers superior vibration resistance compared to coarse threads
Professional Applications & Engineering Value
Engineered for demanding industrial environments, these Grade 8 hex head screws combine high-strength steel construction with advanced zinc-flake coating to address critical engineering challenges. The 1/2"-20 UNF fine thread configuration provides enhanced vibration resistance in machinery, automotive assemblies, and structural applications where loosening under dynamic loads is a concern. The partially threaded design ensures maximum clamping force concentration while the external hex drive facilitates high-torque installation without stripping. These heavy-duty fasteners are specifically designed to maintain integrity under extreme mechanical stress, making them ideal for construction equipment, industrial machinery, and automotive frameworks where failure is not an option.
Specification Summary & Compliance
Manufactured to exacting Class 2A thread fit tolerances with UNF thread form specifications. Complies with ASME B18.2.1 and SAE J429 standards for dimensional accuracy and mechanical properties. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements. The Grade 8 classification ensures consistent performance with 150,000 psi tensile strength and Rockwell C33 hardness verification throughout production.
