S-90471A425 2-56 x 1/8" 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
- High tensile strength of 60,000 psi ensures reliable fastening under mechanical stress and vibration
- Rockwell B70 hardness provides excellent wear resistance and maintains thread integrity during repeated installations
- Class 2A thread fit offers optimal assembly clearance while maintaining secure engagement with mating components
- 100° countersink angle enables flush mounting for streamlined surfaces and improved aerodynamics
- Fully threaded design maximizes grip length and load distribution across the entire fastener
- Phillips No. 1 drive facilitates efficient installation with standard industrial tools
Professional Applications & Engineering Value
These 2-56 UNC flat head screws deliver critical engineering solutions where space constraints and surface finish matter. The zinc-plated steel construction provides essential corrosion protection for electrical enclosures, machinery panels, and automotive assemblies exposed to humidity or chemical agents. With coarse thread spacing and Class 2A thread fit, these fasteners resist vibration loosening while allowing for rapid installation in production environments. The flat head profile with 100° countersink creates seamless transitions in precision equipment, aerospace components, and electronic housings where protrusions would interfere with function. The combination of 60,000 psi tensile strength and Rockwell B70 hardness ensures these screws maintain clamp force in high-stress applications without thread stripping or head deformation.
Specification Summary & Compliance
Manufactured to ASME B18.6.3 specifications with Class 2A thread tolerances for consistent fit and performance. Features UNC coarse threads with right-hand direction and 1/8" length. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for restricted substance control.
