S-90273A552 1/4"-20 x 2 1/2" ASME B18.6.3 Steel Phillips Flat Head Screws
Steel Phillips Flat 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
- Superior corrosion resistance with zinc-plated steel construction, extending service life in demanding industrial environments
- Exceptional holding power with 60,000 psi tensile strength and Rockwell B70 hardness for reliable performance under heavy loads
- Precision alignment and flush mounting thanks to the 82° countersink angle and standard flat head profile
- Quick installation and secure drive engagement with Phillips No. 3 drive and coarse UNC threading
- Consistent thread quality with Class 2A thread fit ensuring proper engagement and reduced cross-threading risks
- Versatile partial threading design providing optimal grip in materials requiring both clamping and unthreaded shank benefits
- Full regulatory compliance meeting ASME B18.6.3 specifications and environmental standards including RoHS 3 and REACH
Professional Applications & Engineering Value
This 1/4"-20 UNC flat head Phillips screw delivers critical engineering solutions for industrial assembly applications where flush surface mounting is essential. The zinc-plated steel construction provides reliable corrosion protection in manufacturing environments, while the 60,000 psi tensile strength ensures structural integrity under vibration and load stress. The partially threaded design offers superior clamping force for materials that benefit from both threaded engagement and smooth shank support. With its 82° countersink angle and Phillips No. 3 drive, installation efficiency is maximized in metal fabrication, machinery assembly, and equipment maintenance applications where speed and reliability are paramount.
Specification Summary & Compliance
This fastener maintains Class 2A thread fit tolerance with 1/4"-20 UNC coarse thread spacing and partial threading up to 1½" minimum thread length. Manufactured to ASME B18.6.3 specifications with full compliance to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The screw features standard dimensional accuracy with 0.477" head diameter, 0.153" head height, and 2½" overall length for consistent performance across industrial applications.
