S-91247A124 5/16"-24 x 3 1/4" 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 tensile strength rated at 120,000 PSI for reliable performance in demanding applications
- Superior corrosion resistance with zinc plating that protects against rust and extends service life
- Precise UNF fine threading ensures secure, vibration-resistant connections in critical assemblies
- Rockwell C25 hardness provides excellent wear resistance and maintains thread integrity under load
- Optimized partial threading allows for better clamping force distribution and easier installation
- Class 2A thread fit guarantees consistent, reliable engagement with standard UNF nuts
- External hex drive design enables high-torque installation with common tools for efficient assembly
Professional Applications & Engineering Value
This Grade 5 hex head screw delivers exceptional engineering value through its zinc plated steel construction and UNF fine threading, specifically designed to address common industrial fastening challenges. The combination of 120,000 PSI tensile strength and Rockwell C25 hardness ensures reliable performance in heavy machinery, automotive assemblies, and structural applications where vibration resistance and load-bearing capacity are critical. The partially threaded design provides optimal stress distribution while the external hex drive allows for high-torque installation without stripping. These industrial hex screws maintain dimensional stability in demanding environments, making them ideal for OEM manufacturing, equipment maintenance, and construction projects requiring inch system compatibility and long-term durability.
Specification Summary & Compliance
Manufactured to exacting Class 2A thread fit tolerances with 5/16"-24 UNF fine threading and 3 1/4" length. Complies with ASME B18.2.1 and SAE J429 standards for dimensional accuracy and mechanical properties. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements. The Grade 5 classification ensures consistent performance with 120,000 PSI tensile strength and proper Rockwell C25 hardness verification.
