S-91283A248 1 1/4"-7 x 4 1/2" 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
- High tensile strength of 100,000 PSI ensures reliable performance in demanding industrial applications, reducing the risk of fastener failure
- Grade 5 steel construction with Rockwell C19 hardness provides excellent durability and resistance to wear in high-stress environments
- Coarse UNC threading with Class 2A fit offers faster installation and superior resistance to vibration loosening compared to fine threads
- Partial threading design allows for precise clamping force control and prevents thread damage in blind holes
- External hex drive with 1-7/8" head width delivers maximum torque transmission and compatibility with standard tools
- Full compliance with ASME B18.2.1 and SAE J429 standards guarantees dimensional accuracy and interchangeability
- RoHS 3 and REACH compliance ensures environmental responsibility and regulatory acceptance in global markets
Professional Applications & Engineering Value
This Grade 5 hex head screw delivers exceptional engineering value for heavy-duty industrial applications where vibration resistance and structural integrity are critical. The 1-1/4"-7 UNC coarse thread configuration provides superior holding power in softer materials and faster installation in production environments. Manufactured from high-strength steel with precise Class 2A thread fit, this fastener eliminates play and maintains clamping force under dynamic loads. The partially threaded design concentrates stress away from the threaded portion, preventing shear failure in structural connections. Ideal for machinery assembly, construction equipment, and transportation applications, this ASME B18.2.1 compliant screw ensures reliable performance in the most demanding fastening scenarios while meeting international environmental standards.
Specification Summary & Compliance
This hex head screw features precise Class 2A thread fit with 1-1/4"-7 UNC coarse threading and 4-1/2" length. Manufactured to ASME B18.2.1 and SAE J429 Grade 5 specifications, ensuring dimensional accuracy and mechanical properties. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations for environmental safety and substance restrictions.
