S-91286A207 3/8"-16 x 1 5/8" 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 prolongs service life in harsh industrial environments, minimizing maintenance needs.
- High hardness rating (Rockwell C33) provides excellent wear resistance and durability under repetitive loading conditions.
- Coarse UNC threading with Class 2A fit enables quick installation and secure fastening in various materials.
- External hex drive design allows for high torque application using standard tools, improving assembly efficiency.
- Partial threading offers optimal grip length control for precise clamping in structural applications.
- Compliance with major standards including ASME B18.2.1 and SAE J429 ensures consistent quality and interchangeability.
Professional Applications & Engineering Value
These Grade 8 hex head screws deliver critical engineering value in demanding applications where failure is not an option. The zinc-flake coated steel construction provides superior protection against corrosion in outdoor, marine, and chemical exposure environments, addressing common industrial pain points of premature fastener degradation. The 3/8"-16 UNC coarse thread configuration ensures reliable engagement in both metallic and non-metallic materials, while the external hex drive facilitates high-torque installation in confined spaces. With partial threading and precise Class 2A thread fit, these screws provide optimal clamping force distribution in heavy machinery, structural steel connections, and automotive assemblies, preventing joint loosening under vibration and dynamic loads.
Specification Summary & Compliance
This Grade 8 hex head screw features precise Class 2A thread fit with 3/8"-16 UNC coarse threading and right-hand direction. Manufacturing complies with ASME B18.2.1 and SAE J429 specifications for dimensional accuracy and mechanical properties. The fastener meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance requirements, ensuring environmental responsibility and material safety in industrial applications.
