S-91247A481 3/4"-16 x 3 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
- Enhanced corrosion resistance with zinc plating for longer service life in demanding environments
- High tensile strength of 120,000 PSI ensures reliable performance in heavy-duty applications
- Fine UNF threading provides superior vibration resistance and secure fastening
- Class 2A thread fit guarantees precise installation and consistent torque performance
- Grade 5 strength classification delivers optimal balance of strength and ductility
- External hex drive design enables easy installation with standard tools
- Partially threaded configuration allows for precise clamping force control
Professional Applications & Engineering Value
This Grade 5 hex head screw with 3/4"-16 UNF fine threading is engineered to solve critical fastening challenges in industrial settings. The zinc plated steel construction provides essential corrosion protection for machinery, structural assemblies, and equipment exposed to harsh conditions. The partially threaded design ensures optimal grip length while preventing thread damage during installation. With 120,000 PSI tensile strength and Rockwell C25 hardness, this fastener maintains integrity under extreme loads and vibration, making it ideal for heavy machinery, construction equipment, and automotive applications where failure is not an option. The external hex drive facilitates quick installation and removal with standard tools, reducing maintenance downtime.
Specification Summary & Compliance
This hex head screw features precise Class 2A thread fit tolerances and complies with ASME B18.2.1 and SAE J429 Grade 5 manufacturing specifications. The fastener meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards, ensuring safe use across various industrial sectors. Manufactured in the inch system with 3/4"-16 UNF fine threads and 3 1/2" length, this screw delivers consistent dimensional accuracy for reliable performance in critical applications.
