S-91268A183 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
- Exceptional Load-Bearing Capacity - Grade 8 classification and 150,000 PSI tensile strength ensure reliable performance in high-stress applications, reducing failure risks.
- Superior Wear Resistance - Rockwell C33 hardness provides excellent durability against abrasion and deformation, extending service life.
- Optimized Thread Engagement - Fully threaded 5/16"-18 UNC coarse design delivers maximum grip and vibration resistance in various materials.
- Precise Assembly Control - External hex drive and 1/2" head width allow for secure tool engagement and efficient torque application.
- Consistent Thread Quality - Class 2A thread fit guarantees smooth installation and interchangeability with standard nuts.
- Rigorous Compliance Assurance - Meets ASME B18.2.1 and SAE J429 standards, ensuring engineering reliability and safety.
- Environmental Responsibility - RoHS 3 and REACH compliance supports sustainable manufacturing and regulatory adherence.
Professional Applications & Engineering Value
Engineered for demanding industrial environments, this Grade 8 hex head screw combines high-strength steel with a fully threaded UNC coarse design to address critical challenges like joint loosening under dynamic loads. The external hex drive facilitates quick installation in confined spaces, while the Rockwell C33 hardness resists wear in machinery, construction, and automotive assemblies. Its 150,000 PSI tensile strength and coarse threads provide superior clamping force in soft or brittle materials, minimizing stripping and ensuring long-term structural integrity. Ideal for heavy-duty fastening, it enhances reliability in equipment where vibration and high tension are concerns.
Specification Summary & Compliance
This fastener adheres to Class 2A thread fit tolerances per UNC standards, with precise dimensions including 5/16"-18 thread size and 3/4" length. Manufactured under ASME B18.2.1 and SAE J429 Grade 8 specifications, it ensures consistent quality. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) for environmental safety.
