S-92620A331 1 1/4"-7 x 6 1/2" 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
- Maximum Load-Bearing Capacity: Grade 8 classification and 150,000 psi tensile strength ensure reliable performance in high-stress industrial and construction applications.
- Superior Corrosion Resistance: Zinc Yellow-Chromate plating provides excellent protection against rust and environmental degradation, extending service life in harsh conditions.
- Optimized Thread Engagement: Coarse UNC thread profile and Class 2A fit guarantee secure fastening with reduced risk of cross-threading during installation.
- Enhanced Torque Transmission: External hex drive and large 1 7/8" head width allow for high-torque application using standard tools without slippage.
- Controlled Thread Distribution: Partial threading design concentrates strength where needed while minimizing weight and material usage.
- Industry Compliance Assurance: Meets ASME B18.2.1 and SAE J429 specifications for dimensional accuracy and mechanical properties.
- Environmental Responsibility: RoHS 3 and REACH compliance ensures safe use without restricted hazardous substances.
Professional Applications & Engineering Value
These Grade 8 hex head screws deliver critical performance where structural integrity cannot be compromised. The 1 1/4"-7 UNC coarse thread provides superior holding power in wood, metal, and composite materials, while the zinc yellow-chromate plated finish withstands corrosive environments in construction, heavy machinery, and infrastructure projects. The partially threaded design prevents joint loosening under vibration, making them ideal for structural steel connections, equipment frames, and load-bearing assemblies. With Rockwell C33 hardness and 150,000 psi tensile strength, these industrial screws maintain clamp force under extreme loads, eliminating the need for frequent retightening and reducing maintenance costs in demanding applications.
Specification Summary & Compliance
Manufactured to Class 2A thread fit tolerances with 1 1/4"-7 UNC coarse threads and 3" minimum thread length. Complies with ASME B18.2.1 dimensional standards and SAE J429 mechanical properties for Grade 8 fasteners. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements.
