S-91257A959 1"-8 x 3 1/2" 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 the most demanding heavy-duty applications, reducing the risk of fastener failure.
- Superior corrosion resistance provided by the zinc yellow-chromate plating extends service life and maintains integrity in harsh industrial environments.
- High hardness rating (Rockwell C33) offers excellent wear resistance and durability, minimizing deformation under high stress.
- Coarse UNC thread design allows for faster installation and easier alignment, saving valuable assembly time in industrial settings.
- Partial threading provides an unthreaded shank for precise clamping and shear strength, ideal for structural connections.
- Class 2A thread fit ensures consistent, reliable engagement with nuts for secure fastening without binding.
- External hex drive enables high-torque application with standard tools, facilitating quick and secure installations.
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, this Grade 8 hex head screw delivers critical reliability where failure is not an option. The 1"-8 UNC coarse thread configuration resists vibration loosening while the zinc yellow-chromate plating provides robust protection against corrosion in demanding environments like construction equipment, machinery frames, and structural assemblies. The partially threaded design concentrates strength at the shear plane, preventing joint slippage under extreme loads. Manufactured to ASME B18.2.1 specifications with 150,000 psi tensile strength, these screws solve engineering challenges requiring predictable performance and long-term durability in critical connections.
Specification Summary & Compliance
This 3 1/2" length hex head screw features Class 2A thread fit tolerance and 1"-8 UNC coarse thread specifications per ASME B18.2.1/SAE J429 standards. The fastener meets Grade 8 strength requirements with 150,000 psi tensile strength and Rockwell C33 hardness. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations for environmental safety and restricted substances.
