S-91283A278 1 1/4"-7 x 9" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws
Medium-Strength Grade 5 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 100,000 psi tensile strength for reliable performance in high-stress applications
- Superior durability achieved through Rockwell C19 hardness and Grade 5 steel construction
- Secure fastening engagement with Class 2A thread fit and coarse UNC threading for vibration resistance
- Easy installation and removal using standard tools with the external hex drive design
- Optimized thread distribution through partial threading for balanced strength and weight efficiency
- Industry-standard compliance with ASME B18.2.1 specifications for consistent quality and interchangeability
- Environmental responsibility with RoHS 3 and REACH compliance for sustainable industrial use
Professional Applications & Engineering Value
This Grade 5 steel hex head screw delivers critical performance in demanding industrial environments where structural integrity and vibration resistance are paramount. The 1 1/4"-7 UNC coarse threading with Class 2A fit ensures rapid assembly while maintaining secure fastening in heavy machinery, construction equipment, and structural steel applications. The partially threaded design provides optimal stress distribution, preventing thread damage during installation while the external hex drive allows for high-torque application with standard tools. Manufactured from high-strength steel with Rockwell C19 hardness, these industrial hex screws withstand extreme mechanical loads and environmental challenges, making them ideal for critical joints in manufacturing, infrastructure, and heavy equipment assembly where failure is not an option.
Specification Summary & Compliance
This 9" length hex head screw features precise 1 1/4"-7 UNC coarse threading with Class 2A thread fit per inch system standards. The fastener meets ASME B18.2.1 manufacturing specifications and SAE J429 Grade 5 strength requirements, ensuring dimensional accuracy and mechanical performance. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations confirms environmental responsibility and safe industrial use across global markets.
