S-90275A554 1/4"-20 x 3" ASME B18.6.3 Steel Slotted Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction, ensuring long-term reliability in harsh industrial environments
• High tensile strength of 60,000 psi provides exceptional load-bearing capacity for demanding applications
• Rockwell B70 hardness rating delivers excellent durability and resistance to wear and deformation
• Class 2A thread fit ensures smooth installation and reliable fastening performance
• Standard 82° countersink angle allows for flush mounting and clean finished appearance
• Fully threaded UNC coarse thread design enables maximum grip length and faster installation
• Slotted drive style offers compatibility with standard tools for easy maintenance and assembly

Professional Applications & Engineering Value

This 1/4-20 UNC flat head screw is engineered to solve critical fastening challenges in industrial settings where corrosion resistance and high tensile strength are paramount. The zinc-plated steel construction provides essential protection against environmental factors, while the fully threaded coarse design ensures maximum holding power in materials like metal, wood, and composite assemblies. The standard 82° countersink angle allows for seamless flush mounting in predrilled holes, eliminating protrusions that could interfere with machinery operation or product function. Ideal for manufacturing equipment, structural frameworks, and heavy-duty machinery applications, this slotted flat head screw combines reliable performance with straightforward installation and maintenance accessibility.

Specification Summary & Compliance

This fastener features Class 2A thread fit per UNC standards with 3" length and 1/4-20 coarse thread spacing. Manufactured in compliance with ASME B18.6.3 specifications for dimensional accuracy and performance requirements. The product meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards, ensuring safe use across various industrial sectors while maintaining consistent quality and reliability.