S-91286A111 1/4"-20 x 1" 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 heavy-duty applications
- Superior corrosion protection through zinc-flake coating, extending service life in harsh industrial environments
- Precise thread engagement with Class 2A UNC coarse threads ensuring reliable installation and vibration resistance
- High hardness rating of Rockwell C33 provides excellent wear resistance and prevents thread deformation
- Full threading design offers consistent clamping force along the entire 1" length for uniform stress distribution
- Standard-compliant manufacturing meeting ASME B18.2.1 and SAE J429 specifications for guaranteed interchangeability
- Environmental compliance with RoHS 3 and REACH regulations for safe use in regulated industries
Professional Applications & Engineering Value
These Grade 8 hex head screws deliver exceptional engineering value in demanding applications where failure is not an option. The zinc-flake coated steel construction addresses corrosion concerns in manufacturing facilities, outdoor equipment, and automotive assemblies, while the UNC coarse thread design prevents cross-threading during high-volume installation. The external hex drive provides superior torque transmission for secure fastening in heavy machinery, structural steel connections, and industrial equipment maintenance. With 150,000 psi tensile strength, these fasteners solve critical challenges in load-bearing assemblies where vibration resistance and long-term reliability are paramount, making them ideal for construction equipment, truck frames, and high-stress mechanical systems.
Specification Summary & Compliance
This 1/4"-20 x 1" hex head screw features precision Class 2A thread fit with UNC coarse thread spacing, manufactured to exacting ASME B18.2.1 and SAE J429 standards. The fastener maintains full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring suitability for global industrial applications requiring strict material restrictions.
