S-94688A312 1/4"-20 x 1 1/4" 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 capability with 150,000 PSI tensile strength, ideal for high-stress industrial assemblies
- Superior corrosion resistance provided by zinc yellow-chromate plating, extending service life in harsh environments
- Maximum thread engagement through fully threaded UNC coarse pattern design for enhanced holding power
- Precise torque application enabled by external square drive design, preventing tool slippage during installation
- Guaranteed interchangeability with Unified Standard Class 3A thread fit, ensuring consistent performance across applications
- Heavy-duty construction meeting SAE Grade 8 specifications for reliable performance in critical applications
- Industry-standard compliance with ASME B18.2.1 specifications for quality assurance in industrial fastening
Professional Applications & Engineering Value
Engineered for demanding industrial applications, these SAE Grade 8 square head screws deliver exceptional performance where failure is not an option. The 150,000 PSI tensile strength provides critical load-bearing capacity for heavy machinery, structural steel connections, and high-vibration equipment. The zinc yellow-chromate plating offers superior protection against corrosion in outdoor or chemically aggressive environments, while the UNC coarse thread pattern ensures rapid installation and maximum resistance to loosening under dynamic loads. The external square drive design allows for high-torque application without cam-out, making these square head bolts ideal for construction, manufacturing, and maintenance applications requiring reliable, high-strength fastening solutions.
Specification Summary & Compliance
These 1/4"-20 square head screws feature Unified Standard Class 3A thread fit for precision engagement and are manufactured to ASME B18.2.1 specifications. The fully threaded design with UNC coarse thread spacing provides consistent performance across the entire 1 1/4" length. The SAE Grade 8 classification ensures mechanical properties including the specified 150,000 PSI tensile strength, making these fasteners suitable for critical industrial applications requiring verified performance standards and reliable mechanical properties.
