S-91247A933 1"-8 x 8 1/2" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws
Medium-Strength Grade 5 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 120,000 psi tensile strength and Rockwell C25 hardness for reliable performance in demanding applications
- Superior corrosion resistance through zinc plating, extending service life in harsh industrial environments
- Optimized torque transmission with external hex drive design ensuring secure installation and removal
- Enhanced grip and vibration resistance with coarse UNC threading that maintains holding power under stress
- Precision thread fit meeting Class 2A standards for consistent engagement and reduced cross-threading risks
- Versatile partial threading providing both gripping strength and clearance where needed
- Regulatory compliance assurance with RoHS 3 and REACH standards for global industrial use
Professional Applications & Engineering Value
This Grade 5 hex head screw delivers critical engineering advantages for heavy machinery, structural steel connections, and industrial equipment assembly. The zinc plated steel construction provides essential corrosion protection in manufacturing facilities and outdoor applications, while the 1"-8 UNC coarse thread design ensures rapid installation and superior resistance to vibrational loosening. The external hex drive accommodates high torque requirements without stripping, and the partial threading configuration allows for both secure clamping and clearance in complex assemblies. Meeting ASME B18.2.1 and SAE J429 specifications, this fastener provides predictable performance in critical joints where failure is not an option.
Specification Summary & Compliance
Manufactured to precise Class 2A thread fit tolerances with 1"-8 UNC coarse thread specifications. Complies with ASME B18.2.1 dimensional standards and SAE J429 material requirements for Grade 5 fasteners. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards. The inch system measurement ensures compatibility with North American industrial equipment and specifications.
