High carbon steel machine screw plug tap for cutting standard National Coarse (UNC) 12-24 NC threads by hand. The plug-style chamfer (3-5 threads) starts smoothly in a pre-drilled hole and produces a Class 2B fit, suitable for routine maintenance, repair work, re-threading and general production tapping.

• Size: 12-24 NC
• Thread series: National Coarse (UNC)
• Chamfer style: plug (3-5 thread taper)
• Thread class produced: 2B
• Material: high carbon steel
• 4 precision ground straight flutes for rapid chip removal
• Tap size and recommended drill bit size are etched on the tool
• Designed for hand threading work

Tip: Use the matching tap drill (#16 (0.1770") for 12-24 NC) and apply cutting fluid to extend tap life and produce cleaner threads. For blind holes that need full threads near the bottom, follow the plug tap with a bottoming tap.