S-91286A154 5/16"-18 x 3/4" 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
- Maximum Load-Bearing Capacity: Grade 8 classification and 150,000 psi tensile strength ensure reliable performance in high-stress industrial applications.
- Superior Corrosion Protection: Zinc-flake coating provides excellent resistance to rust and environmental degradation, extending service life.
- Precision Thread Engagement: Class 2A UNC coarse threads offer quick assembly and secure fastening with reduced cross-threading risk.
- High-Torque Installation Capability: External hex drive and 1/2" head width allow for easy application with standard tools and high tightening forces.
- Enhanced Durability: Rockwell C33 hardness and full threading provide consistent strength along the entire fastener length.
- Regulatory Compliance: Meets ASME B18.2.1 and SAE J429 specifications, ensuring interchangeability and quality assurance.
- Environmental Safety: RoHS 3 and REACH compliance guarantees safe use in regulated industries and global markets.
Professional Applications & Engineering Value
Engineered for demanding industrial applications, these Grade 8 hex head screws deliver exceptional reliability in heavy machinery, construction equipment, and automotive assemblies. The zinc-flake coated steel construction addresses critical corrosion challenges in harsh environments, while the UNC coarse thread design ensures rapid installation and vibration resistance. With 150,000 psi tensile strength and Rockwell C33 hardness, these fully threaded fasteners maintain structural integrity under extreme loads, preventing joint failure in critical connections. The external hex drive facilitates high-torque applications using standard wrenching tools, streamlining maintenance and assembly processes across manufacturing and infrastructure projects.
Specification Summary & Compliance
This 5/16"-18 x 3/4" hex head screw features Class 2A thread fit tolerances per UNC standards, ensuring precise dimensional accuracy. Manufacturing complies with ASME B18.2.1 and SAE J429 specifications for Grade 8 fasteners. The product is certified RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting international environmental and safety regulations for industrial components.
