Milwaukee Tool 49-57-5149 M9x1.25 Straight Flute Tap

Product Description

The MILWAUKEE TOOL 49-57-5149 is a straight flute tap designed to cut M9x1.25 metric internal threads in through-holes and shallow blind holes. Built from high-carbon steel with a black oxide finish, this tap delivers consistent thread quality in ferrous metals and softer materials. The plug chamfer — typically 3 to 5 threads of lead — makes it suitable for starting threads partway down a hole, offering a balance between bottoming taps and taper taps. With 4 flutes and a right-hand thread direction, it produces clean chip evacuation in standard tapping conditions. Licensed machinists, millwrights, and maintenance technicians install this tap by hand or with a machine tapper on production and repair work.

This tap is suited for threading M9x1.25 holes in general metalworking, MRO maintenance, and light manufacturing applications. It fits residential and commercial shop environments where metric fastener repair or fabrication is required. The straight flute design is best applied to through-holes or shallow blind holes in materials such as mild steel, cast iron, and aluminum where chip evacuation flows back out of the hole. It is sold individually and is intended for use with a standard tap wrench or tapping head that accepts the corresponding shank diameter.

Key Features

• M9x1.25 metric thread size with right-hand thread direction and Class 2B fit tolerance
• High-carbon steel construction provides hardness suitable for threading mild steel and non-ferrous materials
• Black oxide finish reduces friction and provides light corrosion resistance during storage and use
• Plug chamfer with 4 flutes for reliable thread starting in through-holes and shallow blind holes
• 31.75 mm thread length accommodates standard metric bolt engagement depths
• No coolant-through design — compatible with hand tapping and standard machine tapping setups

Compatibility

Designed as an OEM-style replacement tap for use in standard tap wrenches, tapping heads, and CNC tapping attachments that accept the corresponding shank size for M9x1.25 metric thread applications.

Installation Notes

This tap is installed by licensed machinists or maintenance technicians using a tap wrench or powered tapping head. Always ensure the workpiece is securely fixtured before tapping, and apply cutting fluid appropriate for the workpiece material to extend tap life and improve thread finish. Back the tap out periodically to break chips when working in blind holes. Inspect the tap for wear or chipping before each use — a damaged tap can seize in the hole or produce out-of-tolerance threads.