S-91257A707 7/16"-20 x 5" 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 with Grade 8 classification and 150,000 psi tensile strength for critical structural applications
- Superior corrosion protection through zinc yellow-chromate plating that withstands harsh industrial environments
- Precise torque application enabled by external hex drive design and 5/8" head width for secure fastening
- Enhanced thread engagement with UNF fine threading and Class 2A fit ensuring vibration resistance
- Optimized strength-to-weight ratio through Rockwell C33 hardness and partial threading design
- Reliable performance in high-stress applications with 5" length providing ample clamping surface
- Industry compliance assurance meeting ASME, SAE, RoHS 3, and REACH standards for quality and safety
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these Grade 8 hex head screws deliver exceptional performance in construction, machinery assembly, and structural frameworks where high tensile strength is paramount. The UNF fine threading provides superior resistance to vibration loosening, while the zinc yellow-chromate plating offers robust protection against corrosion in demanding environments. The external hex drive design ensures maximum torque transmission without stripping, and the partial threading concentrates strength where needed most. These steel fasteners are specifically designed to withstand extreme mechanical stresses while maintaining thread integrity and clamping force in critical assemblies.
Specification Summary & Compliance
Manufactured to precision standards with Class 2A thread fit and UNF fine thread specifications ensuring dimensional accuracy. Complies with ASME B18.2.1 and SAE J429 manufacturing standards for consistent quality and performance. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements, ensuring safe use across various industrial sectors.
