S-90275A537 1/4"-20 x 1/2" ASME B18.6.3 Steel Slotted Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc plating for extended service life in demanding industrial environments
• High tensile strength of 60,000 psi ensures reliable fastening under substantial mechanical loads
• Rockwell B70 hardness provides excellent durability and resistance to wear during installation and use
• Class 2A thread fit offers optimal assembly clearance for faster, smoother installation while maintaining secure connections
• 82° countersink angle allows for flush mounting in standard countersunk holes, creating clean, professional finishes
• Fully threaded design maximizes grip length and provides consistent holding power along the entire fastener
• Compliance with major standards including ASME B18.6.3 ensures dimensional accuracy and interchangeability

Professional Applications & Engineering Value

This 1/4"-20 UNC flat head screw delivers exceptional engineering value through its zinc-plated steel construction and precision manufacturing. The combination of 60,000 psi tensile strength and Rockwell B70 hardness addresses common industrial challenges of fastener failure under stress and wear resistance during repeated assembly cycles. The coarse thread spacing and Class 2A thread fit significantly reduce cross-threading risks while speeding up installation in production environments. The 82° countersink angle and slotted drive style make these screws ideal for machinery assembly, electrical enclosures, and metal fabrication where flush mounting and tool accessibility are critical. These industrial screws maintain dimensional consistency across applications, ensuring reliable performance in automotive, manufacturing, and construction sectors.

Specification Summary & Compliance

This fastener maintains precise Class 2A thread fit tolerances according to UNC thread standards with a 1/4"-20 thread size in the inch measurement system. Manufacturing specifications strictly adhere to ASME B18.6.3 dimensional requirements, ensuring interchangeability and reliability. The product is fully compliant with RoHS 3 (2015/863/EU) regulations and REACH (EC 1907/2006) standards, meeting current environmental and safety requirements for industrial components.