S-90273A537 1/4"-20 x 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 for extended service life in demanding environments
- Exceptional holding power with 60,000 psi tensile strength and Rockwell B70 hardness for reliable fastening in heavy-duty applications
- Optimized installation efficiency through Phillips No. 3 drive design that prevents cam-out and ensures secure driver engagement
- Perfect flush mounting with standard 82° countersink angle that seats cleanly in prepared holes for smooth surface finishes
- Reliable thread engagement with fully threaded UNC coarse spacing and Class 2A fit for quick assembly and vibration resistance
- Industry-standard compatibility with 1/4"-20 thread size meeting common equipment and component specifications
- Regulatory compliance assurance with RoHS 3 and REACH compliance for global market acceptance and environmental responsibility
Professional Applications & Engineering Value
These zinc-plated steel flat head screws deliver critical performance advantages in industrial assembly where surface flushness and corrosion protection are paramount. The combination of 60,000 psi tensile strength and Rockwell B70 hardness ensures reliable fastening in machinery, equipment frames, and structural components subjected to vibration and load stresses. The fully threaded UNC coarse spacing with Class 2A fit provides excellent engagement in both metals and plastics, while the 82° countersink angle creates seamless surface integration. Particularly valuable in electrical enclosures, automotive assemblies, and manufacturing equipment, these Phillips drive screws offer installation efficiency with their standardized drive system that reduces tool slippage and production downtime.
Specification Summary & Compliance
This 1/4"-20 flat head screw features precise Class 2A thread fit with UNC coarse thread spacing and right-hand threading. Manufactured to ASME B18.6.3 dimensional standards with Rockwell B70 hardness and 60,000 psi tensile strength. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for safe use in industrial applications worldwide.
