S-94688A320 3/8"-16 x 1 1/2" ASME B18.2.1 Square Head Screws
Square 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 with 150,000 PSI rating ensures reliable performance in high-stress industrial environments.
- Superior corrosion resistance from zinc yellow-chromate plating extends service life in harsh or outdoor conditions.
- Coarse UNC threading provides faster installation and reduced cross-threading risk compared to fine threads.
- External square drive design allows for high-torque application with standard tools, minimizing slippage.
- Fully threaded shank offers consistent grip along the entire length for uniform clamping force.
- Precision Class 3A thread fit guarantees secure fastening with minimal tolerance deviations.
- Heavy-duty SAE Grade 8 classification confirms suitability for critical machinery and structural applications.
Professional Applications & Engineering Value
Engineered for demanding scenarios, this Square Head Screw combines SAE Grade 8 steel and UNC coarse threading to address common industrial challenges like vibration loosening and assembly speed. The zinc yellow-chromate finish provides a durable barrier against moisture and chemicals, making it ideal for construction equipment, agricultural machinery, and automotive assemblies where corrosion resistance is critical. Its external square drive enables efficient installation with standard wrenches, reducing labor time while the fully threaded design ensures even load distribution. By meeting ASME B18.2.1 specifications, it delivers consistent quality for heavy-duty fastening in structural frameworks and high-torque connections.
Specification Summary & Compliance
This screw adheres to Unified Standard Class 3A thread fit for precise engagement, with 3/8"-16 UNC coarse threads and a length of 1-1/2". Manufactured in compliance with ASME B18.2.1 standards, it ensures dimensional accuracy and reliability. The zinc yellow-chromate plating offers environmental protection, aligning with common industry requirements for corrosion resistance in industrial components.
