Product Description
Milwaukee 1/8 in.-28 BSP Straight Flute Taper Tap
Model Number: 49-57-5190
The Milwaukee 49-57-5190 is a 1/8 in.-28 BSP Straight Flute Taper Tap, precision machined for creating or repairing clean, accurate internal threads. Two things set this tap apart from a standard machine-screw tap. First, it is a taper tap: rather than the short chamfer of a plug tap, it has a longer, more gradual tapered lead of several threads that eases the tap into the hole for aligned, gradual starts, reducing the risk of cross-threading on the initial cut. Second, it cuts a BSP thread. BSP stands for British Standard Pipe, a pipe thread used to join pipe and fittings and seal fluid and gas connections to the British standard, and it is important to understand that BSP is not the same as NPT. The two use different thread forms, BSP the 55 degree Whitworth form and NPT the 60 degree form, and even at the 1/8 in. size the pitch differs, with BSP at 28 threads per inch and NPT at 27, so a BSP fitting requires a BSP tap and the two cannot be interchanged. The 1/8 in. designation is the nominal pipe size, not the physical diameter, and the straight flute geometry clears chips as it cuts 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 and improves surface lubricity for a longer service life in the harsh environments where pipe threading happens. 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 taper chamfer eases the tap into the work for a controlled, aligned start.
This taper tap is designed for cutting BSP pipe threads in the most common metal applications, including brass, aluminum, mild steel, and more, which makes it a go-to for machinists, maintenance crews, and technicians threading ports and fittings for 1/8 in. BSP connections, work that comes up most often on imported equipment, hydraulic and pneumatic systems, and anything built to British or metric standards. It handles both tapping fresh holes and chasing or repairing an existing damaged 1/8 in.-28 BSP thread. Before ordering, confirm your fitting is BSP and not NPT, since the two look similar but are not compatible. Because BSP taper is a sealing thread, the depth to which the tap is run controls the final fit, and a thread sealant or tape is typically used on the assembled joint. 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 1/8 in.-28 BSP Straight Flute Taper Tap
- Cuts a tapered BSP pipe thread for sealed fluid and gas connections
- Taper tap with a long, gradual chamfer for aligned, gradual starts
- Reduces the risk of cross-threading on the initial cut
- BSP is the British Standard Pipe thread, not interchangeable with NPT
- Different thread form and pitch from NPT, so confirm your fitting is BSP
- The 1/8 in. is the nominal pipe size, not the physical diameter
- 28 threads per inch
- High carbon steel construction for durability
- Black oxide coating for corrosion resistance and improved lubricity
- Long-lasting laser-etched sizing and a square shank for standard handles
- Best used with cutting fluid for a clean finish and longer tap life
Specifications
- Manufacturer: Milwaukee Tool
- Part Number: 49-57-5190
- Type: Straight Flute Taper Tap
- Thread Size: 1/8 in. BSP (nominal pipe size)
- Thread Type: BSP (British Standard Pipe)
- Threads Per Inch: 28
- Chamfer: Taper, for gradual starts
- Flutes: Straight
- Material: High carbon steel
- Finish: Black oxide
- Shank: Square, fits standard tap handles and wrenches
- Part Type: Genuine Milwaukee Accessory
Includes
- (1) Milwaukee 49-57-5190 1/8 in.-28 BSP Straight Flute Taper Tap
