S-91257A602 5/16"-18 x 6" 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, preventing fastener failure.
- Superior corrosion resistance from the zinc yellow-chromate plating extends service life in harsh or outdoor environments.
- High hardness (Rockwell C33) provides excellent wear resistance and maintains thread integrity during repeated use.
- Coarse UNC threading allows for faster installation and reduced risk of cross-threading in rugged assembly conditions.
- Partial threading design offers optimal grip and clamping force where a non-threaded shank is required for precise alignment.
- Class 2A thread fit ensures consistent, easy assembly while maintaining secure fastening without binding.
- External hex drive and hex head facilitate straightforward installation and removal with common tools, improving maintenance efficiency.
Professional Applications & Engineering Value
This Grade 8 hex head screw is engineered for demanding applications where high tensile strength and durability are critical. The steel construction combined with a zinc yellow-chromate plating provides robust protection against corrosion, making it ideal for machinery, structural assemblies, and outdoor equipment. The coarse UNC thread and partial threading ensure quick, secure fastening in materials prone to vibration or thermal expansion, reducing assembly time and enhancing joint reliability. By meeting ASME B18.2.1 and SAE J429 standards, this fastener delivers consistent performance in heavy-duty industrial and automotive settings, minimizing downtime and maintenance costs.
Specification Summary & Compliance
This fastener adheres to precise dimensional standards with a Class 2A thread fit and UNC coarse thread spacing, ensuring compatibility and ease of use. It conforms to ASME B18.2.1 and SAE J429 specifications for Grade 8 hex head screws, guaranteeing mechanical properties and reliability. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for hazardous substances.
