S-94688A333 5/8"-11 x 2 1/2" 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 high-stress industrial applications
- Superior corrosion resistance from zinc yellow-chromate plating, extending service life in harsh environments
- Reliable coarse thread engagement with 5/8"-11 UNC threading for faster installation and reduced cross-threading risk
- High-torque drive compatibility thanks to the external square head design, preventing tool slippage during tightening
- Precision thread fit meeting Unified Standard Class 3A for consistent, vibration-resistant connections
- Full threading along the 2 1/2" length provides flexible positioning and maximum grip in varied material thicknesses
- Industrial standard compliance with ASME B18.2.1, ensuring interchangeability and reliability in machinery and structural assemblies
Professional Applications & Engineering Value
Engineered for heavy-duty fastening in demanding sectors, this SAE Grade 8 square head screw delivers exceptional performance where failure is not an option. The zinc yellow-chromate plated steel construction combats oxidation in outdoor or humid settings, while the 5/8"-11 UNC coarse thread ensures quick, secure engagement in structural steel, heavy machinery, and construction projects. Its external square drive allows high torque application with standard tools, reducing installation time and preventing head stripping. Fully threaded for uniform stress distribution, it solves common issues of joint loosening under dynamic loads, making it a trusted choice for industrial assembly, equipment manufacturing, and infrastructure builds requiring high-strength, durable fasteners.
Specification Summary & Compliance
This screw features a Unified Standard Class 3A thread fit for precise tolerance and a coarse thread series (UNC) optimized for quick assembly. Manufactured from high-strength steel with a zinc yellow-chromate finish, it meets ASME B18.2.1 specifications for dimensional accuracy and performance. The product conforms to industry standards for SAE Grade 8 mechanical properties, including a minimum tensile strength of 150,000 psi, and is suitable for applications requiring reliable, standardized square head screws in industrial and construction settings.
