S-91247A438 5/8"-18 x 2 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
- Superior corrosion resistance with zinc plating, extending service life in demanding environments
- High tensile strength of 120,000 psi ensures reliable performance under heavy loads and vibration
- Fine UNF threading (5/8"-18) provides superior vibration resistance and precise clamping force
- Grade 5 strength classification guarantees consistent mechanical properties for critical applications
- External hex drive design allows for high torque application with standard tools
- Class 2A thread fit ensures smooth assembly and interchangeability with standard components
- Partially threaded shank offers optimal grip range and prevents thread damage during installation
Professional Applications & Engineering Value
This Grade 5 hex head screw delivers exceptional engineering value for industrial assembly applications where vibration resistance and corrosion protection are critical. The zinc plated steel construction provides durable surface protection against environmental factors, while the fine UNF threading maintains clamping force in high-vibration environments such as machinery, automotive systems, and structural frameworks. The external hex drive enables efficient installation with common tools, and the partially threaded design ensures proper engagement without compromising structural integrity. With Rockwell C25 hardness and 120,000 psi tensile strength, this fastener withstands substantial mechanical stress while maintaining dimensional stability.
Specification Summary & Compliance
This 5/8"-18 UNF hex head screw features Class 2A thread fit for precise dimensional accuracy and interchangeability. Manufactured to ASME B18.2.1 and SAE J429 Grade 5 specifications, ensuring consistent quality and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, meeting the latest industry standards for hazardous substance restrictions.
