S-91257A883 3/4"-16 x 6" 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 for reliable performance in high-stress applications
- Superior corrosion resistance provided by zinc yellow-chromate plating, extending service life in harsh environments
- Precise thread engagement with Class 2A thread fit and UNF fine threading for secure fastening and vibration resistance
- Heavy-duty construction featuring Grade 8 steel with Rockwell C33 hardness for maximum durability
- Easy installation and removal with external hex drive and 1 1/8" head width for standard tool compatibility
- Optimized thread design with partial threading for controlled clamping force distribution
- Regulatory compliance assurance meeting ASME B18.2.1, SAE J429, RoHS 3, and REACH standards
Professional Applications & Engineering Value
These Grade 8 hex head screws deliver critical engineering solutions for industrial applications requiring maximum tensile strength and corrosion resistance. The 3/4"-16 UNF fine threading provides superior vibration resistance in heavy machinery, construction equipment, and structural assemblies where loosening under dynamic loads is a concern. The zinc yellow-chromate plating creates a protective barrier against environmental factors, making these steel fasteners ideal for outdoor applications and harsh operating conditions. With partial threading design, these screws offer precise clamping force control while the external hex drive ensures straightforward installation with standard tools, reducing assembly time in manufacturing and maintenance operations.
Specification Summary & Compliance
Manufactured to precise Class 2A thread fit tolerances with UNF fine thread spacing (3/4"-16), these hex head screws comply with ASME B18.2.1 and SAE J429 specifications for dimensional accuracy and performance. The fasteners meet RoHS 3 (2015/863/EU) compliance for hazardous substance restrictions and REACH (EC 1907/2006) standards for chemical safety. With 6" length and 1 3/4" minimum thread length, these components are engineered for demanding industrial applications requiring verified quality and regulatory conformity.
