S-90058A199 8-32 x 1" Tamper-Resistant Tri-Groove-Drive Steel Round Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with zinc-plated steel construction, ensuring long-term reliability in harsh industrial environments
• Superior tensile strength of 80,000 psi provides reliable fastening under high-stress conditions without failure
• Precision Class 3A thread fit guarantees consistent engagement and vibration resistance in critical assemblies
• Efficient No. 6 Tri-Groove drive system enables quick installation with reduced cam-out risk for improved productivity
• Fully threaded UNC coarse spacing design delivers maximum holding power across the entire 1" length
• Optimized rounded head profile with 0.28" diameter provides secure seating while minimizing surface protrusion
• Rockwell C28 hardness rating maintains thread integrity through repeated installation cycles

Professional Applications & Engineering Value

Engineered for demanding industrial fastening applications, these zinc-plated steel rounded head screws solve critical vibration and corrosion challenges in machinery assembly, metal fabrication, and construction projects. The Class 3A UNC thread precision combined with coarse thread spacing ensures rapid installation while maintaining exceptional clamp load retention. The Tri-Groove drive system provides superior torque transmission compared to conventional drives, reducing fastener damage during high-torque applications. With 80,000 psi tensile strength and complete threading, these 8-32 screws deliver consistent performance in structural connections, equipment mounting, and heavy-duty assemblies where reliability is paramount.

Specification Summary & Compliance

Manufactured to exacting standards with UNC thread form and Class 3A fit tolerance for precision engagement. The 1" length features fully threaded coarse spacing (0.164" major diameter) with right-hand thread direction. Complies with industry standards for zinc-plated steel fasteners and meets material specifications for industrial applications. The 0.28" head diameter and high rounded profile provide optimal bearing surface for secure fastening operations.