S-91286A289 7/16"-14 x 4 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 tensile strength of 150,000 psi provides reliable performance in high-stress applications, reducing the risk of fastener failure.
- Superior corrosion resistance from the zinc-flake coating extends service life in harsh industrial environments, minimizing maintenance needs.
- High hardness (Rockwell C33) ensures excellent wear resistance and durability under repetitive loading conditions.
- Coarse UNC threading allows for quicker installation and better performance in materials prone to vibration or thermal expansion.
- Class 2A thread fit offers consistent, reliable engagement with standard nuts, streamlining assembly processes.
- External hex drive design enables high torque application with common tools, facilitating efficient installation and removal.
- Partial threading provides optimal grip length for joint integrity while allowing unthreaded shank strength in shear applications.
Professional Applications & Engineering Value
This Grade 8 hex head screw delivers critical engineering solutions for heavy machinery, structural steel connections, and industrial equipment assembly. The zinc-flake coated steel construction provides superior corrosion protection that outperforms standard zinc plating in demanding environments, while the 7/16"-14 UNC coarse thread configuration maintains secure fastening in vibrating applications. The combination of 150,000 psi tensile strength and Rockwell C33 hardness ensures these fasteners withstand extreme mechanical stresses without deformation, making them ideal for critical load-bearing applications in construction, manufacturing, and transportation equipment where joint integrity is paramount.
Specification Summary & Compliance
Manufactured to ASME B18.2.1 and SAE J429 Grade 8 specifications with Class 2A thread fit tolerance for consistent performance. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Features 7/16"-14 UNC coarse threading with 4 1/2" length and partial threading configuration for optimal application performance.
