S-91247A118 5/16"-24 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
- Exceptional load-bearing capability with Grade 5 classification and 120,000 psi tensile strength for reliable performance in demanding applications.
- Superior corrosion resistance due to zinc plating, extending service life in various industrial environments.
- Precise and secure fastening ensured by UNF fine threads and Class 2A thread fit, minimizing loosening under vibration.
- Optimized partial threading allows for focused grip strength where needed, ideal for components requiring specific clamping zones.
- Easy installation and removal with external hex drive and standard 1/2" head width, compatible with common tools.
- High durability and wear resistance from Rockwell C25 hardness, maintaining integrity under repeated stress.
- Compliance with major industry standards including ASME B18.2.1 and SAE J429, ensuring consistent quality and interoperability.
Professional Applications & Engineering Value
This 5/16"-24 UNF hex head screw is engineered to address critical fastening challenges in heavy-duty industrial applications. The Grade 5 steel construction, combined with a zinc plated finish, provides robust resistance to corrosion and mechanical stress, making it suitable for machinery, automotive assemblies, and structural frameworks where reliability is paramount. The partially threaded design concentrates clamping force effectively, preventing joint failure in dynamic environments. With fine UNF threads and Class 2A fit, it ensures tight, vibration-resistant connections, reducing maintenance needs and enhancing operational safety. These screws are ideal for engineers seeking high-strength, standards-compliant fasteners that deliver long-term performance in rigorous conditions.
Specification Summary & Compliance
This screw features precise Class 2A thread fit and adheres to UNF fine thread standards with a size of 5/16"-24. It is manufactured in compliance with ASME B18.2.1 and SAE J429 Grade 5 specifications, ensuring dimensional accuracy and mechanical properties. The product is also RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for global industrial use.
