7x Swaging Tube Expander Tool Drill Bit Set Air Conditioner Copper Tube Expander

The set is designed to cover the most common copper tube outer diameters, typically ranging from 1/4 in to 3/4 in (approximately 6 mm to 19 mm). Each of the 7 bits corresponds to one standard OD size. Check the individual bit markings against your tube OD before use to confirm the correct match.

Yes. The hex shank design is compatible with standard 3/8 in and 1/2 in drill chucks found on most cordless and corded electric drills. The bits also work with pneumatic air drills. Use a low-to-medium drill speed setting for best results when expanding copper tube.

This set is engineered specifically for copper tubing (Type K, L, and M). While the hardened steel bits are durable, using them on aluminum or stainless steel tubing is not recommended, as it may damage the bit profile and produce an inaccurate socket. Use tube-type-specific tooling for non-copper materials.

The bell-mouth socket profile produced by these bits is primarily intended for soldering or brazing, which is the standard method for permanent copper tube joints in HVAC and plumbing. The socket can also serve as a slip-fit alignment aid during assembly, but for pressure-rated systems, always complete the joint with solder or braze filler per applicable codes.

Match the bit size to the outer diameter (OD) of your copper tube, not the nominal pipe size. For example, 1/2 in nominal Type L copper has an OD of approximately 5/8 in (15.9 mm). Measure your tube OD with calipers and select the corresponding bit. Each bit in the set is marked with its target OD for easy identification.

Yes. Swaging is a standard technique for joining copper line-set tubing in split-system and mini-split air conditioner installations. The set covers the 1/4 in and 3/8 in sizes commonly used for suction and liquid lines in residential AC systems, as well as larger sizes for light-commercial applications. Always pressure-test joints after brazing before charging the system.

After each use, wipe the bits clean of copper shavings and any flux residue with a dry cloth. Store them in a dry location to prevent surface oxidation. Avoid dropping the bits on hard surfaces, as impact can chip the machined profile. Inspect the socket-forming tip before each use; replace any bit that shows visible deformation or chipping.