S-91257A418 1/4"-20 x 10" 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 corrosion resistance provided by zinc yellow-chromate plating, extending service life in harsh environments
- Optimized torque transmission through external hex drive design for secure installation and removal
- Enhanced durability with Rockwell C33 hardness rating, maintaining structural integrity under repeated stress
- Precise thread engagement with UNC coarse threading and Class 2A fit for consistent fastening performance
- Versatile partial threading allowing for both clamping and alignment functions in assembly operations
- Industry-standard compliance meeting ASME B18.2.1 and SAE J429 specifications for quality assurance
Professional Applications & Engineering Value
This Grade 8 hex head screw delivers critical engineering solutions for industrial applications demanding both high tensile strength and corrosion protection. The zinc yellow-chromate plated steel construction provides superior defense against environmental degradation, while the UNC coarse threading ensures rapid installation and reliable performance in vibration-prone environments. The partially threaded design offers precise clamping control, making it ideal for machinery assembly, structural frameworks, and heavy equipment where 150,000 psi tensile strength is essential for maintaining joint integrity under extreme loads. The external hex drive facilitates efficient installation with standard tools, reducing assembly time in manufacturing and maintenance operations.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Class 2A thread fit and UNC coarse threading (1/4"-20) ensuring consistent performance across applications. This 10-inch hex head screw complies with ASME B18.2.1 and SAE J429 specifications, guaranteeing dimensional accuracy and mechanical properties. The Grade 8 classification verifies the fastener meets rigorous quality standards for industrial use, while the zinc yellow-chromate plating provides RoHS-compliant corrosion protection suitable for various operating environments.
