S-94688A310 1/4"-20 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 tensile strength of 150,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure
- Superior corrosion resistance from zinc yellow-chromate plating extends service life in demanding industrial environments
- Precision Class 3A thread fit provides consistent engagement and vibration resistance in critical assemblies
- External square drive design offers superior torque transmission and prevents tool slippage during installation
- Fully threaded construction allows for maximum grip length and uniform load distribution across the entire fastener
- Heavy-duty SAE Grade 8 rating guarantees consistent mechanical properties for demanding industrial applications
- Coarse UNC thread pattern enables quick assembly and disassembly while resisting cross-threading issues
Professional Applications & Engineering Value
This SAE Grade 8 square head screw delivers exceptional engineering value through its robust steel construction and zinc yellow-chromate plating, specifically engineered to withstand harsh industrial conditions where corrosion resistance and high tensile strength are critical. The 1/4"-20 UNC coarse thread configuration combined with external square drive provides superior torque transmission for heavy machinery, construction equipment, and structural applications where vibration resistance and reliable fastening are paramount. The fully threaded design ensures maximum engagement in thick materials, while the Class 3A thread fit maintains precision in high-vibration environments, making these square head screws ideal for maintenance, repair, and OEM applications requiring dependable, high-strength fastening solutions.
Specification Summary & Compliance
This fastener features 1/4"-20 UNC coarse threads with Unified Standard Class 3A precision fit, 3/4" length, and complies with ASME B18.2.1 manufacturing specifications. The zinc yellow-chromate plating provides corrosion protection while maintaining dimensional accuracy. Manufactured to inch system standards with right-hand threading and external square drive configuration, this SAE Grade 8 screw delivers consistent performance meeting industrial quality requirements for heavy-duty applications.
