S-94688A314 5/16"-18 x 3/4" 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 capacity with 150,000 PSI tensile strength, ideal for high-stress structural and machinery applications.
- Superior corrosion resistance provided by zinc yellow-chromate plating, extending service life in harsh or outdoor environments.
- Reliable, precise fit due to Unified Standard Class 3A thread fit, ensuring secure fastening and vibration resistance.
- Easy installation and removal with the external square drive and square head design, allowing for high-torque application with standard tools.
- Optimized for coarse UNC threading, enabling quick assembly and reduced cross-threading risks in industrial settings.
- Full threading along the 3/4" length offers versatile grip range and consistent holding power across various material thicknesses.
- Compliance with ASME B18.2.1 specifications guarantees dimensional accuracy and interchangeability in professional assemblies.
Professional Applications & Engineering Value
This SAE Grade 8 square head screw is engineered to address critical challenges in heavy machinery, construction, and automotive sectors where high tensile strength and durability are non-negotiable. The coarse UNC thread and fully threaded design ensure rapid installation and robust clamping force, minimizing downtime in production lines. The zinc yellow-chromate plating effectively combats rust and corrosion, making it suitable for outdoor equipment or humid operational environments. With its external square drive and Class 3A thread fit, this fastener delivers reliable performance in vibrating systems, preventing loosening and maintaining structural integrity under dynamic loads.
Specification Summary & Compliance
This square head screw adheres to Unified Standard Class 3A thread fit and ASME B18.2.1 dimensional standards, ensuring precise thread engagement and interchangeability. It features a 5/16"-18 UNC coarse thread with a 3/4" length and is manufactured from high-strength steel to meet SAE Grade 8 requirements, including a tensile strength of 150,000 PSI. The zinc yellow-chromate plating offers enhanced corrosion protection, and the product complies with industry-recognized specifications for reliable use in demanding industrial applications.
