S-91257A441 5/16"-24 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
- Maximum Load-Bearing Capacity: Grade 8 classification and 150,000 PSI tensile strength ensure reliable performance in high-stress industrial applications.
- Superior Corrosion Resistance: Zinc yellow-chromate plating provides excellent protection against rust and environmental degradation.
- Enhanced Thread Engagement: Class 2A thread fit and 5/16"-24 UNF fine thread design offer precise, vibration-resistant connections.
- Optimized Torque Application: External hex drive and 1/2" head width allow for secure tightening with standard tools.
- Controlled Fastener Placement: Partially threaded design with 7/8" minimum thread length prevents over-tightening in deep applications.
- Long-Term Durability: Rockwell C33 hardness maintains structural integrity under repeated mechanical stress.
- Regulatory Compliance: Meets ASME B18.2.1, SAE J429, RoHS 3, and REACH standards for quality and environmental safety.
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these Grade 8 hex head screws address critical challenges in machinery assembly, structural framing, and equipment manufacturing. The zinc yellow-chromate plated steel construction combats corrosion in harsh environments, while the 5/16"-24 UNF fine thread and Class 2A thread fit ensure precise alignment and resistance to loosening under vibration. The partially threaded shank design provides controlled clamping force, preventing joint failure in high-tension scenarios. Ideal for construction, automotive, and aerospace sectors where 150,000 PSI tensile strength and compliance with ASME B18.2.1 standards are non-negotiable for safety and performance.
Specification Summary & Compliance
This 4" length hex head screw features a Class 2A thread fit with 5/16"-24 UNF fine threading and 7/8" minimum thread length. Manufactured to ASME B18.2.1 and SAE J429 specifications, it complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring both dimensional accuracy and material safety for global industrial use.
