S-90273A539 1/4"-20 x 5/8" ASME B18.6.3 Steel Phillips Flat Head Screws
Steel Phillips Flat Head Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Superior corrosion resistance with zinc-plated steel construction for extended service life in demanding environments
- High tensile strength rating of 60,000 psi ensures reliable performance under significant mechanical stress
- Rockwell B70 hardness provides excellent durability and resistance to wear during installation and use
- Class 2A thread fit with UNC coarse threading enables faster assembly and reduced cross-threading risks
- 82° countersink angle with standard flat head profile creates flush surface finishes for streamlined applications
- Full threading along the 5/8" length maximizes grip strength and load distribution across the entire fastener
- Phillips No. 3 drive design offers secure tool engagement and efficient installation with common drivers
Professional Applications & Engineering Value
This zinc-plated steel flat head screw delivers exceptional engineering value across industrial applications where flush mounting and corrosion resistance are critical. The combination of 60,000 psi tensile strength and Rockwell B70 hardness ensures reliable performance in machinery assembly, electrical enclosures, and structural frameworks where vibration resistance and long-term integrity are paramount. The UNC coarse thread pattern with Class 2A fit provides excellent engagement in various materials while reducing installation time. The 82° countersink angle seamlessly integrates with standard chamfered holes, creating smooth surfaces that prevent snagging in automated systems and improve aesthetic finishes in visible applications.
Specification Summary & Compliance
This 1/4"-20 x 5/8" flat head screw maintains precise Class 2A thread fit tolerances with UNC coarse threading and full compliance with ASME B18.6.3 manufacturing specifications. The fastener meets stringent regulatory requirements including RoHS 3 (2015/863/EU) compliance for hazardous substance restrictions and REACH (EC 1907/2006) compliance for chemical safety, ensuring suitability for global industrial markets and environmentally conscious manufacturing operations.
