S-91257A784 9/16"-18 x 3" 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
- Precise thread engagement with Class 2A fit and UNF fine threading for secure fastening and vibration resistance
- Optimal torque transmission through external hex drive design and 13/16" head width for easy installation
- Enhanced durability from Rockwell C33 hardness Grade 8 steel construction
- Versatile partial threading allowing for both clamping and alignment functions in assembly operations
- Regulatory compliance assurance meeting ASME, SAE, RoHS 3, and REACH standards for quality and safety
Professional Applications & Engineering Value
These Grade 8 hex head screws deliver critical engineering solutions for heavy machinery, structural assemblies, and industrial equipment where high tensile strength and vibration resistance are paramount. The 9/16"-18 UNF fine threading with Class 2A fit ensures precise engagement in tapped holes, reducing the risk of thread stripping under dynamic loads. The zinc yellow-chromate plating provides superior corrosion protection in demanding environments, while the partially threaded design offers optimal clamping force distribution. These industrial hex screws are engineered to maintain integrity in applications requiring 150,000 psi tensile strength, from construction equipment to manufacturing systems where failure is not an option.
Specification Summary & Compliance
Manufactured to exact inch system dimensions with 3" length and 9/16"-18 UNF fine threads meeting Class 2A thread fit tolerances. Complies with ASME B18.2.1 and SAE J429 specifications for Grade 8 fasteners. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards. Features right-hand threading, external hex drive, and 23/64" head height for standardized tool compatibility.
