S-91286A190 5/16"-24 x 1 3/4" 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 protection through zinc-flake coating, extending service life in harsh industrial environments
- Precise thread engagement with Class 2A UNF fine threads ensuring secure fastening and vibration resistance
- Optimized torque transmission via external hex head design allowing for high tightening forces without stripping
- Reduced weight and material usage through partial threading while maintaining full strength in critical engagement areas
- Consistent hardness performance with Rockwell C33 rating providing excellent wear resistance and durability
- Industry-standard compatibility meeting ASME B18.2.1 specifications for reliable interchangeability
Professional Applications & Engineering Value
This Grade 8 hex head screw delivers critical engineering solutions for heavy machinery, structural assemblies, and high-vibration equipment where failure is not an option. The 5/16"-24 UNF fine thread configuration provides superior resistance to loosening under dynamic loads, while the zinc-flake coating offers exceptional protection against corrosion in demanding environments. The partially threaded design concentrates strength where needed most, making it ideal for applications requiring precise clamp load distribution. Engineered to ASME B18.2.1 standards, this fastener ensures reliable performance in automotive, construction, and industrial equipment where consistent quality and 150,000 psi tensile strength are paramount for safety and longevity.
Specification Summary & Compliance
This inch system fastener features precise Class 2A thread fit tolerances with UNF fine threading (5/16"-24) and partial threading up to 7/8" minimum thread length. Manufactured to ASME B18.2.1 specifications and SAE J429 Grade 8 requirements, it ensures dimensional accuracy and mechanical performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making it suitable for global industrial applications requiring strict regulatory adherence.
