Milwaukee Tool 49-57-5166 Straight Flute Tap Metric

Product Description

The MILWAUKEE TOOL 49-57-5166 is a straight flute tap designed for cutting metric internal threads in through-holes and shallow blind holes. Built from high-carbon steel with a black oxide finish, this tap delivers reliable performance in ferrous and non-ferrous materials. The plug chamfer style provides a gradual lead-in over several threads, reducing the force required to start the cut. With four flutes and a right-hand thread direction, it produces clean, consistent metric threads to a Class 2B fit. Overall length is 3.25 inches, and the thread length is 0.375 inches. Machinists, pipefitters, and maintenance technicians rely on this tap for production and repair tapping applications.

This tap is suited for general-purpose metric thread cutting in shops, field maintenance, and fabrication environments. The plug chamfer makes it a practical choice for through-hole tapping where alignment and controlled thread engagement are priorities. The 0.375-inch shank diameter and compact 3.25-inch overall length fit standard tap handles and driver chucks used in both bench and portable setups. It is sold individually, making it an efficient replacement or addition to an existing tap set.

Key Features

• Straight flute design suited for through-hole and shallow blind-hole metric tapping
• Plug chamfer provides gradual thread lead-in for controlled starts
• High-carbon steel construction for durability in general-purpose materials
• Black oxide coating reduces friction and provides corrosion resistance
• 4-flute configuration produces consistent Class 2B metric thread fit
• Right-hand thread direction for standard tapping operations

Compatibility

Designed as an OEM-style straight flute tap for use with standard tap handles, T-handle wrenches, and drill press or CNC tap driver chucks accepting a 0.375-inch shank diameter.

Installation Notes

Tapping operations should be performed by a qualified machinist or maintenance technician familiar with proper tap alignment and cutting fluid application. Always secure the workpiece before tapping and use an appropriate cutting fluid for the base material to extend tap life and improve thread quality. Back the tap out periodically to clear chips and reduce the risk of binding or breakage. Inspect the tap for wear or damage before each use and replace if flutes show chipping or dull edges.