S-91236A642 3/8"-16 x 4 1/2" ASME B18.2.1, ASTM A307 Low-Strength Steel Hex Head Screws
Low-Strength 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
- Superior tensile strength of 60,000 psi ensures reliable performance in demanding applications, reducing the risk of fastener failure.
- Enhanced corrosion resistance from zinc plating extends service life in harsh industrial environments, lowering maintenance costs.
- High hardness rating (Rockwell B69) provides excellent wear resistance and durability under repetitive stress.
- Coarse UNC threads with Class 2A fit offer quick assembly and secure fastening, minimizing cross-threading issues.
- External hex drive design allows for high torque application with standard tools, speeding up installation and removal.
- Partial threading enables precise clamping force distribution, ideal for materials requiring vibration resistance.
- Compliance with ASME B18.2.1 and environmental standards guarantees consistent quality and safe use across regulated industries.
Professional Applications & Engineering Value
This 3/8"-16 UNC hex head screw is engineered for heavy-duty industrial applications where reliability is critical. The steel construction with zinc plating combats corrosion in outdoor or humid settings, while the coarse thread design ensures rapid installation in structural steel, machinery, and construction projects. Its partial threading concentrates clamping force near the head, reducing loosening from vibrations in equipment assembly. With a tensile strength of 60,000 psi and Rockwell B69 hardness, it withstands high loads and impacts, making it a cost-effective solution for industrial hex screws in manufacturing, automotive, and infrastructure sectors.
Specification Summary & Compliance
This screw features a Class 2A thread fit per UNC standards, ensuring precise dimensional accuracy for consistent performance. It meets ASME B18.2.1 manufacturing specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free from hazardous substances for safe industrial use.
