S-91257A989 1"-14 x 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 critical structural applications
- Superior corrosion resistance through zinc yellow-chromate plating that withstands harsh industrial environments
- Precise thread engagement with Class 2A fit and extra fine threading for vibration-resistant connections
- Maximum torque transmission via external hex drive and substantial 1 1/2" head width
- Optimized weight distribution through partial threading design that maintains strength while reducing material usage
- Guarded against material failure with Rockwell C33 hardness ensuring dimensional stability under stress
- Simplified compliance management meeting ASME B18.2.1, SAE J429, RoHS 3, and REACH regulations
Professional Applications & Engineering Value
These Grade 8 hex head screws deliver engineering excellence where failure is not an option. The 1"-14 extra fine thread configuration provides superior resistance to vibrational loosening in heavy machinery, automotive assemblies, and structural steel connections. The zinc yellow-chromate plating creates a robust barrier against corrosion in demanding environments, while the external hex drive ensures maximum torque application without stripping. With partial threading, these fasteners optimize clamping force distribution, making them ideal for applications requiring precise load management. The combination of 150,000 psi tensile strength and Rockwell C33 hardness guarantees performance in high-stress industrial applications where reliability is paramount.
Specification Summary & Compliance
Manufactured to exacting Class 2A thread fit tolerances with UNS extra fine threading (1"-14) and compliant with ASME B18.2.1 and SAE J429 specifications. These inch-system fasteners feature 4" length with 2 1/4" minimum thread length and are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for global industrial use.
