S-90920A556 1/4"-20 x 3" ASME B18.6.3 Alloy Steel Torx Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction for extended service life in harsh industrial environments
• Enhanced torque transmission through T27 Torx drive design, reducing cam-out and tool slippage during installation
• Precise flush mounting with standard 82° countersink angle and flat head profile for seamless surface integration
• Reliable thread engagement with Class 3A UNC coarse threads ensuring secure fastening in demanding applications
• Exceptional mechanical strength delivering 60,000 psi tensile strength and Rockwell B70 hardness for heavy-duty use
• Full-threaded design providing maximum grip length and consistent holding power across the entire fastener
• Regulatory compliance assurance meeting ASME B18.6.3 standards and environmental regulations for global industrial use

Professional Applications & Engineering Value

These zinc-plated steel flat head screws with T27 Torx drive are engineered to address critical industrial fastening challenges. The combination of 60,000 psi tensile strength and Rockwell B70 hardness ensures reliable performance in structural applications where vibration resistance and load-bearing capacity are paramount. The UNC coarse threading with Class 3A fit provides superior engagement in various materials while resisting loosening under dynamic loads. The 82° countersink angle and flat head design enable flush installation in machinery, automotive assemblies, and metal fabrication projects, eliminating protrusions that could interfere with moving components. These fully threaded screws maintain consistent clamping force across their entire 3-inch length, making them ideal for thick-section assemblies in construction equipment, industrial machinery, and transportation applications where reliability cannot be compromised.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 3A thread fit for superior tolerance control and consistent performance. These flat head screws feature UNC coarse threading (1/4"-20) in right-hand direction with complete compliance to ASME B18.6.3 specifications. The manufacturing process ensures adherence to strict quality standards while meeting RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements for safe industrial use worldwide.