S-91247A331 7/16"-20 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
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Exceptional tensile strength of 120,000 PSI ensures reliable performance in high-stress industrial applications, reducing the risk of fastener failure.
- Superior corrosion resistance with zinc plating protects against rust and extends service life in harsh environments.
- High hardness rating (Rockwell C25) provides excellent wear resistance and durability under repetitive loads.
- Fine UNF thread design offers better vibration resistance and secure fastening in precision assemblies.
- Partially threaded shank allows for unthreaded grip length, ideal for applications requiring clamping force without thread engagement.
- External hex drive and hex head enable easy installation and high torque application with standard tools.
- Compliance with major standards (ASME B18.2.1, SAE J429) ensures consistent quality and interchangeability.
Professional Applications & Engineering Value
This Grade 5 hex head screw is engineered for demanding industrial settings where reliability is critical. The zinc plated steel construction combats corrosion in outdoor or humid conditions, while the 7/16"-20 UNF fine thread provides superior holding power in machinery, automotive, and structural applications. Its partially threaded design ensures that the unthreaded portion bears shear loads effectively, minimizing thread damage during disassembly. With a Rockwell C25 hardness and 120,000 PSI tensile strength, it withstands heavy vibrations and dynamic stresses, making it a trusted choice for assembly lines, construction equipment, and OEM manufacturing where ASME B18.2.1 compliance is required for safety and performance.
Specification Summary & Compliance
This fastener features a Class 2A thread fit for consistent assembly and meets ASME B18.2.1 and SAE J429 specifications. It is manufactured in the inch system with a length of 3 1/4", thread size of 7/16"-20 UNF, and partial threading. The product is fully RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, ensuring environmental safety and regulatory adherence for global industrial use.
