S-91247A441 5/8"-18 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 of 120,000 PSI ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
- Superior corrosion resistance provided by zinc plating extends service life in harsh industrial environments, minimizing maintenance needs.
- Precise Class 2A thread fit guarantees smooth assembly and secure fastening, improving installation efficiency and joint integrity.
- Partially threaded design allows for controlled clamping force and vibration resistance, ideal for dynamic load conditions.
- High hardness rating (Rockwell C25) enhances wear resistance and durability, supporting long-term operational reliability.
- Compliance with ASME B18.2.1 and SAE J429 standards ensures consistent quality and interoperability in mechanical assemblies.
- RoHS 3 and REACH environmental compliance meets global regulatory requirements, facilitating use in eco-conscious supply chains.
Professional Applications & Engineering Value
This Grade 5 hex head screw is engineered to address critical challenges in heavy-duty industrial settings, such as machinery assembly, structural frameworks, and automotive components. The zinc plated steel construction combats corrosion, while the fine UNF thread and external hex drive enable precise torque application and high clamping force. The partially threaded shank design minimizes stress concentration, enhancing fatigue resistance in vibrating environments. By integrating high tensile strength and standardized dimensions, this fastener delivers reliable performance in demanding applications, reducing downtime and maintenance costs for engineers and procurement specialists.
Specification Summary & Compliance
This fastener adheres to Class 2A thread fit tolerances per UNF standards, ensuring dimensional accuracy for consistent assembly. It meets ASME B18.2.1 and SAE J429 specifications for hex head screws, with material properties including Rockwell C25 hardness and 120,000 PSI tensile strength. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmentally responsible manufacturing and usage.
