S-91257A877 3/4"-16 x 3" 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 tensile strength of 150,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
- Superior corrosion resistance from zinc yellow-chromate plating extends service life in harsh or outdoor environments, minimizing maintenance needs.
- High hardness rating (Rockwell C33) provides excellent wear resistance and durability under repetitive loading conditions.
- Precise Class 2A thread fit allows for smooth assembly and secure fastening, improving installation efficiency and joint integrity.
- Heavy-duty Grade 8 classification guarantees consistent quality and strength for demanding industrial applications.
- External hex drive design offers straightforward installation with standard tools, reducing labor time and complexity.
- Compliance with ASME, RoHS 3, and REACH standards ensures product reliability and environmental safety for global supply chains.
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, this Grade 8 hex head screw addresses critical challenges in machinery assembly, structural frameworks, and equipment manufacturing. The 3/4"-16 UNF fine thread and Class 2A thread fit provide superior vibration resistance and clamping force in dynamic environments, preventing loosening under stress. Made from high-strength steel and finished with zinc yellow-chromate plating, it combats corrosion in demanding settings like construction, automotive, and marine industries. The partially threaded design optimizes grip in thick materials, while the external hex drive ensures compatibility with common tools, streamlining maintenance and reducing downtime.
Specification Summary & Compliance
This fastener meets ASME B18.2.1 specifications and SAE J429 standards for dimensional accuracy and mechanical properties. Threads conform to UNF fine thread standards with Class 2A fit for precise tolerances. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring adherence to environmental and safety regulations without hazardous substances.
