S-92327A812 1/4"-20 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
- Exceptional load-bearing capacity with 120,000 psi tensile strength for reliable performance in demanding applications
- Superior corrosion resistance through zinc yellow-chromate plating that extends service life in harsh environments
- Optimized thread engagement with UNC coarse threading that provides faster assembly and reduced cross-threading risk
- Enhanced drive stability featuring an external square head design for secure tool engagement and torque transmission
- Consistent mechanical properties with Rockwell C25 hardness ensuring dimensional stability under stress
- Precision manufacturing to Unified Standard Class 3A thread fit for reliable mating with compatible nuts
- Full-threaded design offering maximum grip length and uniform stress distribution along the entire fastener
Professional Applications & Engineering Value
These Grade 5 square head screws deliver critical performance in heavy machinery, structural steel connections, and industrial equipment where vibration resistance and high tensile strength are paramount. The zinc yellow-chromate plating provides essential corrosion protection for outdoor applications or environments with moisture exposure. The UNC coarse thread configuration ensures rapid installation in thick materials while maintaining Class 3A thread fit precision. The external square drive design prevents cam-out during high-torque applications, making these fully threaded fasteners ideal for construction, manufacturing, and maintenance operations requiring dependable, long-lasting connections.
Specification Summary & Compliance
Manufactured to exacting Unified Standard Class 3A thread tolerances with 1/4"-20 UNC coarse threading and right-hand thread direction. Complies with ASME B18.2.1 dimensional specifications and SAE J429 Grade 5 mechanical requirements, ensuring consistent quality and interchangeability. The 1 1/4" length provides optimal engagement depth for medium to heavy-duty applications. Meets industry standards for material composition and mechanical properties, delivering reliable performance across industrial and construction sectors.
