S-91257A546 1/4"-20 x 1 1/2" 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 structural applications
- Superior corrosion protection through zinc yellow-chromate plating that withstands harsh industrial environments
- Optimized thread engagement with Class 2A UNC coarse threads ensuring reliable fastening in various materials
- Enhanced installation efficiency featuring external hex drive design for secure tool grip and torque application
- Precision engineering compliance meeting ASME B18.2.1 and SAE J429 specifications for consistent performance
- Durable material construction with Rockwell C33 hardness providing exceptional wear resistance
- Environmental regulation compliance adhering to RoHS 3 and REACH standards for safe industrial use
Professional Applications & Engineering Value
These Grade 8 hex head screws deliver exceptional engineering value in demanding industrial applications where failure is not an option. The steel construction with Rockwell C33 hardness ensures remarkable durability against vibration and shock loads, while the zinc yellow-chromate plating provides superior corrosion resistance in challenging environments. The 1/4"-20 UNC coarse threads with Class 2A fit offer excellent engagement in various materials, reducing the risk of cross-threading and ensuring reliable connections. The external hex drive design allows for high torque application, making these partially threaded screws ideal for heavy machinery, structural steel connections, and automotive assemblies where 150,000 psi tensile strength is critical for safety and performance.
Specification Summary & Compliance
These hex head screws feature precision Class 2A thread fit with UNC coarse threading (1/4"-20) and partial threading with minimum 3/4" thread length. Manufactured to exacting ASME B18.2.1 and SAE J429 specifications, ensuring dimensional accuracy and performance reliability. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making them suitable for global industrial applications requiring strict chemical substance control.
