S-91247A587 5/16"-18 x 1 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 for reliable performance in demanding applications
- Superior corrosion resistance through zinc plating, extending service life in harsh industrial environments
- Optimized thread engagement with Class 2A UNC coarse threads ensuring secure fastening and vibration resistance
- Enhanced durability from Grade 5 steel construction with Rockwell C25 hardness for repeated use
- Efficient installation using standard external hex drive tools for quick assembly and maintenance
- Versatile partial threading design providing both clamping force and alignment flexibility
- Regulatory compliance meeting ASME B18.2.1, RoHS 3, and REACH standards for global industrial applications
Professional Applications & Engineering Value
This Grade 5 steel hex head screw delivers critical engineering solutions where high tensile strength and corrosion resistance are paramount. The zinc plated finish protects against environmental degradation in outdoor equipment, machinery assemblies, and structural frameworks. With its UNC coarse thread pattern and Class 2A thread fit, it maintains secure connections in high-vibration environments common in automotive, construction, and heavy equipment applications. The partially threaded design allows for precise clamping force distribution while the external hex drive enables efficient installation with standard tools, reducing assembly time and labor costs in industrial maintenance and manufacturing operations.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Class 2A thread fit and UNC thread form ensuring consistent performance. Complies with ASME B18.2.1 and SAE J429 specifications for hex head screws, with full adherence to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The 1½" length with 7/8" minimum thread length provides optimal engagement for various material thicknesses in industrial fastening applications.
