Century Drill Tool Co Inc 95112 Plug Tap 1/2-20 Nf

Product Description

The CENTURY DRILL TOOL CO INC 95112 is a 1/2-20 NF plug-style fractional tap designed for hand cutting applications. It cuts National Fine threads at 1/2-inch diameter with 20 threads per inch, producing clean, consistent internal threads in metal workpieces. The tap is heat treated and tempered to achieve hard, durable cutting edges that hold up through repeated use. Precision-formed flutes guide the tap true, reducing the chance of thread distortion or tap breakage during manual threading operations. This is a standard hand-tap tool used by machinists, plumbers, electricians, and HVAC technicians when threading tapped holes in ferrous and non-ferrous materials.

This plug tap is suited for general-purpose threading tasks in both shop and field environments. The plug chamfer — typically 3 to 5 threads of taper — allows the tap to start easily in a drilled hole while still reaching threads close to the bottom of a through-hole or moderately deep blind hole. It is appropriate for repair work, new fabrication, and re-threading damaged fastener holes. Sold in a package of 2, it is a practical stocking item for service vans and toolboxes. The tap is intended for hand operation with a standard tap wrench and is not designed for machine tapping.

Key Features

• 1/2-20 NF thread specification for National Fine pitch applications
• Plug chamfer style for easy starting and versatile through-hole or shallow blind-hole threading
• Heat treated and tempered construction for hard, long-lasting cutting edges
• Precision-cut, accurately formed threads for consistent, repeatable results
• Designed for hand cutting with a tap wrench — not for CNC or drill-press use
• Package quantity of 2 for convenient stocking

Compatibility

Designed for hand threading 1/2-20 NF (National Fine) internal threads in drilled holes sized to the appropriate tap-drill diameter for 1/2-20 thread form.

Installation Notes

Installation is performed by hand using a tap wrench; secure the workpiece firmly in a vise before beginning. Always use cutting oil or tapping fluid appropriate to the material being threaded to extend tap life and improve thread quality. Back the tap off periodically to break chips and prevent binding, especially in deeper holes. Do not force the tap if resistance increases sharply — back out, clear chips, and re-lubricate before continuing.