S-90058A540 1/4"-20 x 3/4" Tamper-Resistant Tri-Groove-Drive Steel Round Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with zinc-plated steel construction, ideal for harsh industrial environments
• High tensile strength of 80,000 psi ensures reliable, long-lasting fastening under heavy loads
• Precise Class 3A thread fit provides superior engagement and vibration resistance in assemblies
• Tri-Groove drive system offers excellent torque transmission and reduced cam-out risk
• Rockwell C28 hardness maintains structural integrity and prevents stripping during installation
• Fully threaded design allows for maximum grip length and uniform stress distribution
• Rounded head profile creates a finished appearance while minimizing surface protrusion

Professional Applications & Engineering Value

Engineered for demanding industrial applications, this zinc-plated steel rounded head screw combines material durability with precision threading to solve critical fastening challenges. The Class 3A UNC coarse thread ensures rapid installation and secure holding power in metal assemblies, machinery, and equipment where vibration resistance is paramount. The Tri-Groove drive system provides superior torque transfer compared to conventional drives, reducing installation time and tool wear. With its 80,000 psi tensile strength and corrosion-resistant zinc plating, this fastener delivers reliable performance in manufacturing, automotive, and construction applications where both structural integrity and environmental protection are essential.

Specification Summary & Compliance

This 1/4"-20 x 3/4" rounded head screw features Class 3A thread fit per UNC standards with coarse thread spacing, ensuring precision compatibility with industry-standard components. Manufactured from zinc-plated steel with Rockwell C28 hardness and full threading, it meets rigorous industrial requirements for dimensional accuracy and mechanical performance. The product complies with relevant industry specifications for heavy-duty fasteners and is suitable for applications requiring reliable right-hand thread engagement and corrosion protection.