S-91257A882 3/4"-16 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
- Exceptional load-bearing capacity with 150,000 psi tensile strength, ideal for high-stress industrial environments
- Superior corrosion resistance provided by zinc yellow-chromate plating, extending service life in harsh conditions
- Reliable thread engagement with Class 2A thread fit ensuring precise assembly and vibration resistance
- Optimized torque transmission through external hex drive design for secure installation with standard tools
- Enhanced fatigue resistance from Rockwell C33 hardness, maintaining integrity under dynamic loads
- Controlled thread engagement with partial UNF fine threading for balanced clamping force distribution
- Regulatory compliance assurance meeting ASME B18.2.1, SAE J429, RoHS 3, and REACH standards
Professional Applications & Engineering Value
This Grade 8 hex head screw delivers critical performance in demanding applications where failure is not an option. The steel construction combined with 150,000 psi tensile strength provides exceptional resistance to elongation and shear forces in heavy machinery, structural steel connections, and industrial equipment assembly. The UNF fine threading offers superior vibration resistance compared to coarse threads, making it ideal for dynamic load environments. Zinc yellow-chromate plating creates a robust barrier against corrosion in outdoor or chemically aggressive settings. The partial threading design allows for precise clamp load control while the external hex drive ensures reliable torque application during installation. These industrial hex bolts solve common fastening challenges including joint relaxation, corrosion-induced failure, and installation inconsistency.
Specification Summary & Compliance
Manufactured to ASME B18.2.1 and SAE J429 Grade 8 specifications with Class 2A thread fit tolerance ensuring dimensional accuracy. Features 3/4"-16 UNF fine threads with minimum 1 3/4" thread length on a 5" overall length. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, containing no restricted substances. The Rockwell C33 hardness and 150,000 psi tensile strength verify consistent mechanical properties across production batches.
