S-94688A329 1/2"-13 x 3" 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
- Maximum load-bearing capability with 150,000 PSI tensile strength, ideal for heavy-duty structural and machinery applications
- Superior corrosion resistance through zinc yellow-chromate plating, extending service life in harsh industrial environments
- Precise Class 3A thread fit ensures reliable engagement and vibration resistance in critical assemblies
- External square drive design provides secure tool grip and high torque transmission without cam-out
- Full threading along 3" length offers consistent clamping force and adjustment flexibility
- Coarse UNC thread profile enables quick installation and reduced cross-threading risk
- SAE Grade 8 certification guarantees consistent mechanical properties for high-stress applications
Professional Applications & Engineering Value
Engineered for demanding industrial applications, this square head screw combines SAE Grade 8 steel construction with Class 3A UNC coarse threads to deliver exceptional performance in heavy machinery, structural steel connections, and construction frameworks. The zinc yellow-chromate plating provides robust protection against oxidation and chemical exposure, significantly reducing maintenance frequency in corrosive environments. Its external square drive allows for high-torque installation using standard industrial wrenches, preventing tool slippage during critical assembly operations. The 1/2"-13 UNC thread configuration ensures compatibility with standard nuts and tapped holes while the 150,000 PSI tensile rating provides a safety margin for dynamic load conditions, making it an optimal choice for vibration-prone equipment and structural applications requiring reliable long-term performance.
Specification Summary & Compliance
This square head screw features precision Class 3A thread fit with 1/2"-13 UNC coarse thread specifications and complies with ASME B18.2.1 dimensional standards. The fastener maintains Unified Standard thread system tolerances and is manufactured from SAE Grade 8 steel with zinc yellow-chromate plating surface treatment. Product conforms to industry standards for high-strength fasteners with verified 150,000 PSI tensile strength rating suitable for critical engineering applications.
