S-90920A542 1/4"-20 x 1" ASME B18.6.3 Alloy Steel Torx Flat Head Screws

Key Features & Benefits at a Glance

• Superior torque transmission with T27 Torx drive design, reducing cam-out and tool wear during installation
• Enhanced corrosion resistance through zinc-plated steel construction for extended service life in demanding environments
• High-strength performance with 60,000 psi tensile strength, ensuring reliable fastening in heavy-duty applications
• Precision countersinking with 82° flat head profile for flush mounting and improved aesthetic finish
• Consistent thread engagement through Class 2A thread fit and UNC coarse threading, facilitating quick assembly
• Full-threaded design providing maximum grip length and uniform stress distribution along the entire fastener
• Regulatory compliance assurance meeting ASME B18.6.3 specifications and international environmental standards

Professional Applications & Engineering Value

This 1/4-20 UNC flat head screw delivers exceptional engineering value through its optimized material and design characteristics. The zinc-plated steel construction provides reliable corrosion protection for industrial equipment, machinery, and outdoor applications where environmental exposure is a concern. The T27 Torx drive system addresses common installation challenges by preventing screw head damage and enabling higher torque application compared to traditional drive types. With its fully threaded configuration and coarse UNC threading, this fastener ensures rapid installation and secure holding power in various materials including metals, plastics, and composites. The 82° countersink angle creates a clean, flush surface finish that eliminates protrusions in precision assemblies. These features make it particularly valuable for manufacturing, automotive, and construction applications where reliable fastening solutions with consistent performance are critical.

Specification Summary & Compliance

This fastener maintains Class 2A thread fit tolerances according to UNC standards, ensuring consistent threading performance and interchangeability. Manufacturing specifications comply with ASME B18.6.3 for dimensional accuracy and mechanical properties. The product meets RoHS 3 (2015/863/EU) compliance for restricted hazardous substances and REACH (EC 1907/2006) regulations for chemical safety, confirming its suitability for global industrial markets and environmentally conscious applications.