S-91286A193 5/16"-24 x 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 with zinc-flake coating extends service life in harsh industrial environments, minimizing maintenance needs.
- High hardness rating (Rockwell C33) provides excellent wear resistance and durability under repetitive loads.
- Fine UNF threading offers improved vibration resistance and secure fastening in precision assemblies.
- Class 2A thread fit ensures consistent, easy installation while maintaining tight tolerances for reliable connections.
- Partially threaded design allows for controlled clamping force and prevents over-tightening in critical joints.
- External hex drive enables high torque application with standard tools, facilitating quick installation and removal.
Professional Applications & Engineering Value
Engineered for demanding industrial applications, these Grade 8 hex head screws deliver exceptional performance where reliability is critical. The UNF fine threading provides superior resistance to vibration loosening in machinery, automotive, and heavy equipment assemblies. The zinc-flake coating offers comprehensive corrosion protection, making these fasteners ideal for outdoor equipment, marine applications, and environments exposed to chemicals or moisture. With 150,000 psi tensile strength and Rockwell C33 hardness, these screws maintain integrity under extreme loads and repetitive stress cycles. The partially threaded configuration ensures precise clamping force distribution, preventing joint failure in structural applications while the external hex drive accommodates high-torque installation requirements common in industrial maintenance and manufacturing.
Specification Summary & Compliance
These 5/16"-24 hex head screws feature Class 2A thread fit per UNF standards with precise dimensional accuracy. Manufacturing complies with ASME B18.2.1 and SAE J429 Grade 8 specifications, ensuring consistent quality and performance. The products are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making them suitable for global industrial applications requiring strict chemical substance control.
