S-91268A193 5/16"-18 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
- Exceptional load-bearing capability with 150,000 psi tensile strength for reliable performance in high-stress environments
- Superior wear and deformation resistance due to Rockwell C33 hardness, extending service life in demanding applications
- Secure and precise fastening ensured by Class 2A thread fit and UNC coarse threading for quick assembly and vibration resistance
- Optimized mechanical strength from Grade 8 steel construction, ideal for heavy-duty industrial and construction uses
- Easy installation and removal with external hex drive and standard 1/2" head width, compatible with common tools
- Enhanced design flexibility through partial threading, allowing for controlled clamping force and unthreaded shank benefits
- Compliance with rigorous industry standards including ASME B18.2.1 and SAE J429, guaranteeing consistent quality and interoperability
Professional Applications & Engineering Value
Engineered for demanding industrial and construction environments, this Grade 8 hex head screw addresses critical challenges such as joint failure under extreme loads and corrosion-induced degradation. The high-strength steel composition, combined with a Rockwell C33 hardness rating, ensures durability against abrasion and fatigue, making it suitable for heavy machinery, structural frameworks, and automotive assemblies. The 5/16"-18 UNC coarse thread design facilitates rapid installation and provides excellent grip in various materials, while the partial threading allows for precise tension control. By meeting ASME B18.2.1 and SAE J429 standards, it offers reliability in applications where safety and performance are paramount, reducing downtime and maintenance costs.
Specification Summary & Compliance
This fastener adheres to precise Class 2A thread fit tolerances and UNC coarse thread specifications, ensuring consistent dimensional accuracy. It conforms to ASME B18.2.1 and SAE J429 manufacturing standards, with full compliance to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmentally responsible and safe usage in global markets.
