S-91257A206 3/4"-10 x 10 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
- Superior corrosion resistance with zinc yellow-chromate plating, extending service life in harsh industrial environments.
- Exceptional tensile strength of 150,000 psi ensures reliable performance under extreme mechanical loads.
- High hardness rating (Rockwell C33) provides excellent wear resistance and prevents thread deformation.
- Coarse UNC threading allows for faster installation and better performance in materials prone to stripping.
- Partial threading design offers optimal grip and clamping force for heavy-duty assembly applications.
- Precision Class 2A thread fit guarantees consistent engagement and vibration resistance in dynamic applications.
- Industry-standard compliance with ASME B18.2.1 and SAE J429 ensures interchangeability and reliability.
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these Grade 8 hex head screws deliver unmatched reliability in construction, machinery, and structural assemblies. The 3/4"-10 UNC coarse thread configuration provides superior pull-out resistance in soft materials while the zinc yellow-chromate plating creates a durable barrier against corrosion, significantly reducing maintenance costs. The partially threaded design concentrates clamping force precisely where needed, preventing joint loosening under vibration. With 150,000 psi tensile strength and Rockwell C33 hardness, these fasteners maintain integrity in high-stress environments where failure is not an option, making them ideal for critical connections in manufacturing equipment, transportation systems, and infrastructure projects.
Specification Summary & Compliance
These hex head screws feature precision Class 2A thread fit with 3/4"-10 UNC coarse threads and partial threading over a minimum 2" length. Manufactured from high-strength steel with zinc yellow-chromate plating finish, they comply with ASME B18.2.1 and SAE J429 Grade 8 specifications, ensuring consistent dimensional accuracy and mechanical properties. The fasteners meet industry standards for heavy-duty applications and conform to RoHS and REACH environmental regulations.
