S-91286A237 3/8"-16 x 6 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
- Maximum Load-Bearing Capacity – Grade 8 classification and 150,000 psi tensile strength ensure reliable performance in high-stress industrial environments.
- Superior Corrosion Protection – Zinc-flake coating provides excellent resistance to rust and environmental degradation, extending service life.
- Precise Thread Engagement – UNC coarse thread with Class 2A fit offers quick assembly and secure fastening, reducing installation time.
- Enhanced Durability – Rockwell C33 hardness and steel construction resist wear, deformation, and fatigue under heavy loads.
- Optimized for High-Torque Applications – External hex drive and hex head design allow for easy tightening with standard tools, preventing stripping.
- Versatile Partial Threading – Combines threaded grip with unthreaded shank for improved shear strength and alignment in structural connections.
- Compliance with Industry Standards – Meets ASME B18.2.1 and SAE J429 specifications, ensuring consistent quality and interchangeability.
Professional Applications & Engineering Value
This Grade 8 hex head screw is engineered to address critical challenges in heavy machinery, construction, and automotive assemblies where high tensile strength and vibration resistance are paramount. The zinc-flake coated finish provides long-term corrosion protection, even in harsh environments, reducing maintenance costs and downtime. With a partially threaded design and UNC coarse thread, it ensures rapid installation and reliable clamping force in steel frameworks, equipment mounts, and structural joints. The external hex drive facilitates high-torque application, making it ideal for bolted connections that demand both durability and ease of assembly.
Specification Summary & Compliance
This fastener adheres to Class 2A thread fit tolerances and UNC coarse thread specifications (3/8"-16), ensuring precise dimensional accuracy. It complies with ASME B18.2.1 and SAE J429 Grade 8 standards for mechanical properties and manufacturing consistency. The product is also RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for industrial use.
