S-92327A817 5/16"-18 x 1 1/4" ASME B18.2.1, SAE J429 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
- Enhanced corrosion resistance with zinc yellow-chromate plating for longer service life in harsh industrial environments
- High tensile strength of 120,000 PSI ensures reliable performance under medium to high stress applications
- Rockwell C25 hardness provides excellent durability and resistance to wear and deformation
- Easy installation and removal with external square drive design for secure tool engagement
- Quick assembly efficiency thanks to UNC coarse threading that reduces cross-threading risks
- Precise thread fit with Unified Standard Class 3A ensuring consistent engagement and vibration resistance
- Full threading along the 1 1/4" length offers maximum grip and adjustment flexibility in various material thicknesses
Professional Applications & Engineering Value
These SAE Grade 5 square head screws are engineered to address critical fastening challenges in industrial machinery, construction equipment, and heavy-duty assemblies. The zinc yellow-chromate plated steel construction delivers superior corrosion protection, extending component life in environments exposed to moisture and chemicals. The UNC coarse thread design facilitates faster installation in tough materials while reducing operator fatigue. With fully threaded configuration and external square drive, these screws provide exceptional clamping force distribution and reliable torque transmission, making them ideal for applications requiring repeated maintenance access. Their medium strength rating and precise Class 3A thread fit ensure vibration-resistant connections in structural frameworks, agricultural equipment, and transportation systems where joint integrity is paramount.
Specification Summary & Compliance
Manufactured to exact inch system dimensions with 5/16"-18 UNC coarse threading and Unified Standard Class 3A thread fit for precision engagement. Complies with ASME B18.2.1 dimensional specifications and SAE J429 standard for Grade 5 mechanical properties. The zinc yellow-chromate plating meets industry corrosion protection requirements while the Rockwell C25 hardness and 120,000 PSI tensile strength validate consistent performance across production batches.
