S-90273A540 1/4"-20 x 3/4" 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, ensuring long-term reliability in harsh industrial environments
- Exceptional holding power with 60,000 psi tensile strength and Rockwell B70 hardness for demanding applications
- Precise Class 2A thread fit provides smooth installation and secure fastening with reduced cross-threading risk
- Standard 82° countersink angle enables flush mounting for clean, professional finishes
- Full threading design maximizes grip length and load distribution across the entire fastener
- Phillips No. 3 drive offers familiar, efficient installation with standard tools
- Comprehensive compliance with ASME B18.6.3, RoHS 3, and REACH standards for quality assurance and environmental safety
Professional Applications & Engineering Value
These zinc-plated steel flat head screws with 1/4"-20 UNC coarse threading deliver exceptional performance in industrial assembly where vibration resistance and corrosion protection are critical. The fully threaded design ensures maximum engagement in metal fabrication, machinery, and equipment manufacturing, while the standard 82° countersink creates seamless surface finishes. The Phillips drive system enables rapid installation in high-volume production environments, and the Class 2A thread fit maintains precision across repeated disassembly cycles. Engineered to withstand demanding conditions, these screws provide reliable fastening solutions for automotive, construction, and industrial maintenance applications where ASME B18.6.3 compliance and environmental regulations are mandatory.
Specification Summary & Compliance
This 1/4"-20 x 3/4" flat head screw features Class 2A thread fit with UNC coarse threading and right-hand orientation. Manufactured to ASME B18.6.3 specifications with full compliance to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards. The zinc-plated steel construction ensures consistent performance with 60,000 psi tensile strength and Rockwell B70 hardness for industrial-grade applications.
