Product Description
Milwaukee 14-20 NS Straight Flute Plug Tap
Model Number: 49-57-5133
The Milwaukee 49-57-5133 is a 14-20 NS Straight Flute Plug Tap, precision machined for creating or repairing clean, accurate internal threads. A tap cuts female threads into a drilled hole, and this plug tap is the most common general-purpose style, with a short tapered chamfer of a few threads at the tip that starts the tap square in the hole before it transitions to full-form threads, which makes it a natural fit for through-hole threading. The 14-20 NS designation identifies a number 14 machine screw diameter with 20 threads per inch in the National Special series. The number 14 size sits between the smaller numbered machine screws and the fractional-inch sizes, with a major diameter of about 0.242 in., just under a quarter inch, and because NS is a special thread rather than a standard coarse or fine pitch, this tap fills the need for the specific 14-20 thread that standard taps will not cut. Keeping the correct specialty tap on hand is exactly what saves the day when a 14-20 NS thread comes up. The straight flute geometry gives the tap the versatility to handle general threading across common metals.
The tap is built for durability and lasting identification. High carbon steel construction holds a sharp cutting edge through the common metal applications it is designed for, and a protective black oxide coating resists corrosion while helping to reduce friction as the tap cuts. Milwaukee marks these taps with long-lasting laser-etched sizing rather than stamped markings, so the size stays clearly legible over the life of the tool. The square shank is compatible with all standard tap handles and tap wrenches, and the tap measures 2.5 in. in overall length with a 1 in. thread length and a 0.25 in. shank.
This plug tap is designed for cutting threads in the most common metal applications, including brass, aluminum, mild steel, and more, which makes it a go-to for machinists, fabricators, and maintenance crews who need to create or restore a 14-20 NS thread. It handles both tapping a fresh hole and chasing or repairing an existing damaged thread. For the cleanest finish, easiest cutting, and longest tap life, use the tap with cutting fluid to keep heat and friction down as it works.
Features
- Genuine Milwaukee 14-20 NS Straight Flute Plug Tap
- Cuts clean, accurate internal threads in the specialty 14-20 NS thread size
- Plug tap style with a starting chamfer for square, easy starts
- Designed for through-hole threading
- Number 14 diameter, about 0.242 in., just under a quarter inch
- NS National Special thread that standard coarse and fine taps will not cut
- High carbon steel construction for durability
- Protective black oxide coating for corrosion resistance
- Long-lasting laser-etched sizing for the clearest identification
- Square shank fits all standard tap handles and tap wrenches
- 2.5 in. overall length, 1 in. thread length, 0.25 in. shank
- Threads brass, aluminum, mild steel, and other common metals, best used with cutting fluid
Specifications
- Manufacturer: Milwaukee Tool
- Part Number: 49-57-5133
- Type: Straight Flute Plug Tap
- Thread Size: 14-20
- Thread Series: NS (National Special)
- Threads Per Inch: 20
- Tap Style: Plug, for through-hole threading
- Flutes: Four, straight
- Material: High carbon steel
- Finish: Black oxide
- Overall Length: 2.5 in.
- Thread Length: 1 in.
- Shank Size: 0.25 in., square, fits standard tap handles and wrenches
- Materials Threaded: Brass, aluminum, mild steel, and other common metals
- Part Type: Genuine Milwaukee Accessory
Includes
- (1) Milwaukee 49-57-5133 14-20 NS Straight Flute Plug Tap
