S-90058A552 1/4"-20 x 2 1/2" Tamper-Resistant Tri-Groove-Drive Steel Round Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction for extended service life in harsh industrial environments
• Exceptional load-bearing capacity with 80,000 psi tensile strength to withstand high-stress applications
• Precision thread engagement with Class 3A fit ensuring reliable, vibration-resistant connections
• Optimized drive efficiency through Tri-Groove design providing superior torque transmission and reduced cam-out
• Enhanced material durability with Rockwell C28 hardness maintaining structural integrity under repeated use
• Versatile partial threading allowing secure clamping while accommodating material thickness variations
• Industry-standard compatibility with UNC coarse threads facilitating easy installation and replacement

Professional Applications & Engineering Value

These 1/4-20 UNC zinc-plated steel screws deliver critical performance advantages in demanding industrial settings. The rounded head profile with Tri-Groove drive system ensures secure installation while minimizing surface damage, making them ideal for assembly lines requiring consistent torque application. The coarse thread design provides rapid installation in various materials, while the partial threading enables precise clamping force distribution. Engineered with Class 3A thread fit, these fasteners maintain connection integrity in vibration-prone equipment, manufacturing machinery, and structural frameworks where reliability is paramount. The zinc-plated surface treatment offers essential protection against environmental corrosion, extending maintenance intervals in outdoor or high-humidity applications.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 3A thread fit tolerance and UNC thread form specifications. The 2-1/2" length with 1-1/2" minimum thread length ensures consistent engagement depth. Complies with industry mechanical standards for 80,000 psi tensile strength and Rockwell C28 hardness requirements. Surface treatment meets corrosion protection specifications for industrial applications.