S-91257A985 1"-8 x 10" 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 industrial applications, reducing the risk of fastener failure.
- Superior corrosion resistance from zinc yellow-chromate plating extends service life in harsh environments, minimizing maintenance needs.
- High hardness (Rockwell C33) provides excellent wear resistance and durability under repetitive loads and vibrations.
- Partially threaded design allows for secure clamping in assemblies where unthreaded shank strength is critical.
- Coarse UNC thread with Class 2A fit enables quick assembly and disassembly, saving time in maintenance and repair operations.
- External hex drive and hex head offer easy installation with standard tools, improving efficiency on the job site.
- Compliance with ASME B18.2.1, RoHS 3, and REACH ensures product reliability and environmental safety for global industrial use.
Professional Applications & Engineering Value
This Grade 8 hex head screw is engineered to address critical challenges in heavy machinery, construction, and automotive sectors where high tensile strength and corrosion resistance are paramount. The steel material and zinc yellow-chromate plating work synergistically to combat rust and degradation in outdoor or chemically exposed settings, while the 1"-8 UNC coarse thread and partial threading provide optimal grip and shear resistance in structural connections. By integrating Rockwell C33 hardness and 150,000 psi tensile capacity, it minimizes deformation under load, ensuring long-term stability in industrial fastening applications such as equipment frames, bolted joints, and load-bearing assemblies, thereby enhancing operational safety and reducing downtime.
Specification Summary & Compliance
This fastener adheres to precise dimensional standards, including Class 2A thread fit for consistent engagement and UNC thread type with coarse spacing. It meets ASME B18.2.1 specifications for hex head bolts and complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for international industrial markets.
