S-91247A521 7/8"-14 x 10" 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
- Superior load-bearing capacity with 120,000 psi tensile strength for demanding structural applications
- Enhanced corrosion resistance through zinc plating, extending service life in harsh environments
- Precise thread engagement with UNF fine threading and Class 2A fit for vibration-resistant connections
- Optimized torque transmission via external hex drive and substantial 1 5/16" head width
- Reliable mechanical properties backed by Grade 5 certification and Rockwell C25 hardness
- Versatile partial threading allowing both clamping and clearance functions in single fastener
- Regulatory compliance assurance meeting ASME B18.2.1 standards and environmental directives
Professional Applications & Engineering Value
This Grade 5 hex head screw delivers exceptional engineering value for heavy machinery, structural steel connections, and industrial equipment assembly. The 7/8"-14 UNF fine threading provides superior resistance to vibrational loosening compared to coarse threads, while the partial threading design allows the unthreaded shank to bear shear loads without compromising thread integrity. The zinc-plated steel construction offers balanced corrosion protection for indoor industrial environments and temporary outdoor exposure. With its external hex drive and substantial head dimensions, the fastener enables high-torque installation in confined spaces common in construction and manufacturing applications where reliable, high-strength connections are critical.
Specification Summary & Compliance
Manufactured to ASME B18.2.1 dimensional standards and SAE J429 Grade 5 mechanical requirements, this hex head screw features Class 2A thread fit tolerance for consistent assembly performance. The 10" length with 2 1/4" minimum thread length provides versatile fastening capabilities. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring suitability for regulated industrial markets and international supply chains.
