S-91268A190 1/4"-20 x 1 3/4" 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 with 150,000 psi tensile strength for critical structural applications
- Superior torque transmission through external hex drive design for secure installation and removal
- Enhanced durability with Rockwell C33 hardness to resist wear and deformation under heavy loads
- Reliable thread engagement with Class 2A UNC coarse threads for quick assembly and vibration resistance
- Full-length threading provides consistent clamping force along the entire 1 3/4" length
- Heavy-duty construction meeting Grade 8 standards for the most demanding industrial environments
- Regulatory compliance ensures material safety and environmental responsibility in global markets
Professional Applications & Engineering Value
This Grade 8 hex head screw delivers exceptional engineering value in heavy machinery, structural steel connections, and industrial equipment assembly. The steel construction combined with 150,000 psi tensile strength addresses critical failure points in high-stress applications, preventing joint separation under extreme loads. The UNC coarse thread design ensures rapid installation in thick materials while maintaining vibration resistance, significantly reducing maintenance cycles. External hex drive compatibility with standard tools provides superior torque application without stripping, making it ideal for construction, automotive, and manufacturing applications where reliability is paramount. The fully threaded design offers uniform stress distribution, eliminating weak points in the fastener assembly.
Specification Summary & Compliance
Manufactured to exacting Class 2A thread fit tolerances with 1/4"-20 UNC coarse threads for precision engagement. Complies with ASME B18.2.1 dimensional standards and SAE J429 material specifications for Grade 8 fasteners. Meets environmental regulations including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) standards for restricted substances. The fastener maintains dimensional accuracy per inch system requirements with proper head width (7/16") and head height (11/64") specifications for consistent tool engagement.
