S-94688A315 5/16"-18 x 1" 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 load-bearing capability with 150,000 psi tensile strength for reliable performance in high-stress applications
- Superior corrosion resistance through zinc yellow-chromate plating, extending service life in harsh environments
- Precise Class 3A thread fit ensures secure mating and vibration resistance in assembled components
- Optimized torque transmission via external square drive design for efficient installation and removal
- Coarse UNC threading provides rapid assembly and reduced cross-threading risk in industrial settings
- Full threading along 1" length offers maximum grip range and adjustment flexibility
- Standardized dimensions per ASME B18.2.1 guarantee interchangeability and consistent performance
Professional Applications & Engineering Value
This SAE Grade 8 square head screw delivers critical engineering solutions where high tensile strength and corrosion resistance are paramount. The zinc yellow-chromate plating creates a protective barrier against oxidation and chemical exposure, making it ideal for outdoor equipment, machinery frames, and structural assemblies. The coarse UNC threading maintains holding power in vibrating environments while allowing quick installation in production lines. With its external square drive design, technicians can apply higher torque without slippage compared to standard hex heads, reducing installation time and tool wear. These fully threaded fasteners ensure uniform stress distribution across the entire engagement length, preventing joint failure in heavy-duty applications from construction to industrial manufacturing.
Specification Summary & Compliance
Manufactured to Unified Standard Class 3A thread tolerances for precision fit, this 5/16"-18 UNC screw maintains exact dimensional accuracy per ASME B18.2.1 specifications. The coarse thread spacing and right-hand threading comply with industrial standards for compatibility with existing components. Constructed from high-grade steel and finished with zinc yellow-chromate plating, this fastener meets industry requirements for mechanical performance and environmental protection in demanding applications.
