S-91268A333 3/8"-16 x 5 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 load-bearing capacity with 150,000 psi tensile strength for reliable performance in high-stress applications
- Superior wear resistance due to Rockwell C33 hardness, ensuring extended service life under demanding conditions
- Optimized thread engagement with Class 2A thread fit and UNC coarse threads for faster assembly and vibration resistance
- Secure torque transmission through external hex drive design, compatible with standard wrenches and sockets
- Partial threading design provides unthreaded shank section for enhanced shear strength in structural connections
- Full regulatory compliance with ASME B18.2.1 and SAE J429 standards, ensuring consistent quality and performance
- Environmentally responsible manufacturing with RoHS 3 and REACH compliance for global market acceptance
Professional Applications & Engineering Value
These Grade 8 hex head screws deliver critical performance in heavy machinery, construction equipment, and industrial assembly where high tensile strength and vibration resistance are paramount. The 3/8"-16 UNC coarse thread configuration ensures rapid installation while maintaining secure fastening in materials where fine threads might strip. The partially threaded design provides an unthreaded bearing surface that significantly enhances shear strength, making these steel fasteners ideal for structural applications and machinery subjected to dynamic loads. With Rockwell C33 hardness, these screws resist deformation under extreme pressure, while the external hex drive allows for high torque application without slippage, ensuring reliable connections in critical industrial environments.
Specification Summary & Compliance
This 5 1/2" length hex head screw features precise Class 2A thread fit tolerance per ASME standards, ensuring consistent engagement and reliability. Manufactured to ASME B18.2.1 and SAE J429 specifications for dimensional accuracy and mechanical properties. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming environmental responsibility and chemical safety for global industrial applications.
