S-91257A726 1/2"-13 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 high-stress applications, reducing the risk of fastener failure.
- Superior corrosion resistance from zinc yellow-chromate plating extends service life in harsh industrial environments, minimizing maintenance needs.
- High hardness rating (Rockwell C33) provides excellent wear resistance and durability under repetitive loading conditions.
- Coarse UNC threads offer faster installation and better performance in materials prone to vibration loosening.
- Partial threading design allows for precise clamping force distribution, ideal for applications requiring specific grip lengths.
- External hex drive enables high-torque installation with common tools, ensuring secure fastening in confined spaces.
- Grade 8 certification guarantees consistent quality and mechanical properties for critical engineering applications.
Professional Applications & Engineering Value
This Grade 8 hex head screw delivers critical engineering solutions where failure is not an option. The zinc yellow-chromate plated steel construction provides superior corrosion protection in demanding environments like outdoor machinery, construction equipment, and automotive assemblies. The 1/2"-13 UNC coarse thread configuration ensures rapid installation and maintains integrity in vibrating applications, while the partial threading allows engineers to precisely control clamping force distribution. With 150,000 psi tensile strength and Rockwell C33 hardness, this heavy-duty bolt withstands extreme mechanical stresses in structural connections, industrial machinery, and heavy equipment manufacturing, providing reliable performance where standard fasteners would fail.
Specification Summary & Compliance
Manufactured to exacting standards with Class 2A thread fit for consistent engagement and proper clearance. Complies with ASME B18.2.1 and SAE J429 specifications for dimensional accuracy and mechanical properties. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements, ensuring safe use across regulated industries.
