S-91268A495 1/2"-13 x 3 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
- Exceptional load-bearing capacity with 150,000 psi tensile strength for critical structural applications
- Superior wear resistance due to Rockwell C33 hardness, extending service life in demanding environments
- Reliable coarse UNC threading provides faster assembly and reduced cross-threading risk in industrial settings
- Precision Class 2A thread fit ensures consistent engagement and vibration resistance
- Heavy-duty Grade 8 certification guarantees consistent mechanical properties for safety-critical connections
- External hex drive design delivers maximum torque transmission with standard tools
- Partial threading configuration optimizes clamping force distribution across joint surfaces
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these Grade 8 hex head screws address critical challenges in machinery assembly, structural steel connections, and high-vibration environments. The 1/2"-13 UNC coarse thread configuration maintains holding power under dynamic loads while enabling rapid installation in thick materials. Manufactured from high-strength steel with Rockwell C33 hardness, these partially threaded fasteners provide optimal stress distribution between threaded and unthreaded sections, preventing joint failure in construction equipment, automotive frames, and industrial machinery. The external hex drive accommodates high torque requirements without stripping, making them ideal for maintenance-critical applications where disassembly and reassembly are frequent.
Specification Summary & Compliance
This 3 1/2" length hex head screw features precision Class 2A thread fit with 1 1/4" minimum thread length and right-hand thread direction. Manufactured to ASME B18.2.1 and SAE J429 Grade 8 specifications, ensuring dimensional accuracy and mechanical performance. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for use in regulated industries.
