High carbon steel fractional plug tap for creating or repairing 5/16-18 NC internal threads. Plug taps have 3 to 5 chamfered threads at the tip for easy starting in pre-drilled or previously tapped holes.

• 5/16-18 NC thread specification
• High carbon steel construction
• Plug style with 3-5 chamfered lead threads
• 4 straight flutes for rapid chip removal
• Produces Class 2B thread tolerance
• Designed for hand threading, maintenance, and repair work

Tip: Use cutting oil and back off periodically to clear chips for cleaner threads.