S-91247A221 3/8"-24 x 1 3/4" 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 strength and durability with Grade 5 steel construction, providing reliable performance for demanding applications.
- Superior corrosion resistance from zinc plating, extending the fastener's service life in various environments.
- High tensile strength of 120,000 psi ensures the screw can withstand significant loads without failure.
- Precise Class 2A thread fit guarantees smooth assembly and secure fastening with minimal play.
- External hex drive design allows for easy installation and removal with standard tools, improving efficiency.
- Partially threaded shank provides optimal grip and clamping force where needed, reducing the risk of loosening.
- Compliance with major standards including ASME B18.2.1 and SAE J429, ensuring quality and interoperability.
Professional Applications & Engineering Value
This 3/8"-24 UNF hex head screw is engineered to address critical industrial challenges, such as vibration-induced loosening and environmental corrosion. Made from Grade 5 steel with a zinc-plated finish, it offers robust protection against rust and wear, making it ideal for machinery, automotive assemblies, and structural frameworks. The fine UNF threads and Class 2A fit provide precise engagement, reducing the risk of cross-threading and ensuring consistent clamping force in high-stress applications. Its partially threaded design concentrates strength where needed, enhancing reliability in dynamic loads. By meeting ASME B18.2.1 and other standards, this fastener delivers predictable performance, minimizing downtime and maintenance costs in industrial hex screw setups.
Specification Summary & Compliance
This fastener adheres to Class 2A thread fit tolerances per UNF standards, ensuring dimensional accuracy. It complies with ASME B18.2.1 and SAE J429 specifications for consistent manufacturing quality. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for hazardous substances.
