S-91268A215 1 1/4"-7 x 3" 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 from Rockwell C33 hardness for extended service life in demanding environments
- Reliable fastening performance through Class 2A thread fit ensuring precise engagement and vibration resistance
- Optimized installation efficiency with external hex drive design providing maximum torque transfer
- Enhanced material integrity from Grade 8 steel construction meeting rigorous industrial standards
- Versatile coarse threading (UNC 1¼"-7) for quick assembly in various materials and conditions
- Full regulatory compliance with RoHS 3 and REACH environmental standards for global supply chain compatibility
Professional Applications & Engineering Value
These Grade 8 hex head screws deliver critical performance in heavy machinery, structural steel connections, and industrial equipment where high tensile strength and vibration resistance are paramount. The fully threaded UNC coarse pattern ensures maximum grip length in both metallic and composite materials, while the external hex drive accommodates high-torque installation without stripping. Manufactured from hardened steel with Rockwell C33 hardness, these fasteners resist deformation under extreme loads, making them ideal for construction, automotive, and manufacturing applications where ASME B18.2.1 compliance is required for quality assurance and safety standards.
Specification Summary & Compliance
This 1¼"-7 UNC hex head screw features Class 2A thread fit tolerances for precise engagement, 3" length with full threading, and meets ASME B18.2.1 specifications (SAE J429). The fastener maintains compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring suitability for international industrial supply chains while delivering consistent performance in inch-system applications.
