S-91268A402 1 1/2"-6 x 8 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 reliable performance in high-stress applications
- Superior wear resistance due to Rockwell C33 hardness, extending service life in demanding environments
- Secure fastening in coarse materials enabled by 1½"-6 UNC coarse threading with Class 2A fit for vibration resistance
- Optimized torque transmission through the 2¼" external hex head design for efficient installation
- Reduced material costs through partial threading while maintaining full strength in critical engagement areas
- Industry-standard compatibility meeting ASME B18.2.1 and SAE J429 specifications for reliable interchangeability
- Environmental compliance assurance with RoHS 3 and REACH compliance for global industrial applications
Professional Applications & Engineering Value
This Grade 8 hex head screw delivers critical engineering solutions for heavy machinery, structural steel connections, and industrial equipment assembly. The 1½"-6 UNC coarse thread configuration provides superior holding power in softer materials and faster installation in production environments. With 150,000 psi tensile strength and Rockwell C33 hardness, this fastener withstands extreme vibrational forces and dynamic loads that would compromise lower-grade alternatives. The partially threaded design concentrates strength where needed while the external hex drive ensures reliable torque application during installation. Ideal for construction equipment, mining machinery, and heavy vehicle applications where failure is not an option.
Specification Summary & Compliance
Manufactured to precise Class 2A thread fit tolerances with 1½"-6 UNC coarse thread specifications. Complies with ASME B18.2.1 dimensional standards and SAE J429 Grade 8 mechanical properties. Meets environmental regulations including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance. Features 8½" overall length with 3½" minimum thread length and right-hand thread direction for standard industrial applications.
