🎬 Watch the installation demo:
Copper Tube Expander Swaging Tool Bit Set — Drill-Powered Pipe Expansion for HVAC & Plumbing
Struggling to get a tight, leak-free joint when connecting copper refrigerant lines? Whether you're installing a mini-split system, repairing an A/C line set, or joining copper plumbing pipe, this 7-piece swaging tool bit set gives you the right size for every standard copper tube diameter — without switching tools mid-job.
The kit combines a 5-in-1 step expander bit (covering 1/4 in / 6 mm, 3/8 in / 9 mm, 1/2 in / 12 mm, 5/8 in / 16 mm, and 3/4 in / 19 mm) with 6 individual swaging heads (S3/8, S1/2, S5/8, S3/4, S7/8, and one additional size). All bits are machined from bearing steel and feature an upgraded hexagonal shank that locks securely into standard drill chucks — no slipping, no rolling off the workbench. The high-temperature expansion method forms a precise bell-mouth socket that prevents cracks and leaks at the joint.
Ideal for HVAC technicians installing split-system and mini-split air conditioners, plumbers joining copper water lines, and vehicle A/C repair specialists extending refrigerant tubing.
✅ Compatible with standard copper tubing used in residential & light-commercial HVAC split systems, mini-splits, vehicle A/C units, and plumbing — covering 1/4 in (6 mm) to 3/4 in (19 mm) inner diameter.
Key Features
- 🔧 7-piece complete kit — includes one 5-in-1 step expander bit and six individual swaging heads, covering all standard residential copper tube sizes from 1/4 in (6 mm) to 3/4 in (19 mm)
- 🏗️ Bearing steel construction — each bit is machined from bearing steel for durability and dimensional accuracy across repeated use on copper tubing
- ⬡ Upgraded hexagonal shank — the hex shank design adapts to more drill interfaces, bites and fixes securely, and does not roll or slip compared to round-shank alternatives
- 🌡️ High-temperature expansion method — the thermal expansion process forms a tight bell-mouth socket that prevents cracks and refrigerant or water leaks at the joint
- ⚡ Drill & air tool compatible — fits standard power drills and pneumatic tools; faster and more convenient than manual expanders
- 🎬 Step-by-step operation guide — 4-step process: choose the right size → attach to drill → expand the tube → operation complete. Watch the demo: Watch Demo
What's in the Box
- 1 × 5-in-1 step expander bit (1/4 in / 6 mm, 3/8 in / 9 mm, 1/2 in / 12 mm, 5/8 in / 16 mm, 3/4 in / 19 mm)
- 6 × Individual swaging heads: S3/8, S1/2, S5/8, S3/4, S7/8, and one additional size
Who Is This For
🔧 HVAC Technicians & Refrigeration Engineers — Professionals installing or repairing split-system air conditioners and mini-splits who need reliable, repeatable copper tube expansion with a standard power drill on the job site.
🏠 DIY Homeowners Installing Mini-Splits — Homeowners running their own line sets for ductless mini-split systems who want a complete expander kit compatible with their existing cordless drill.
🚗 Vehicle A/C Repair Specialists — Mechanics repairing or extending copper refrigerant lines in vehicle air conditioning systems where a precise, leak-free expansion is critical.
🪛 Plumbers & Pipefitters — Trade professionals joining copper water lines who need a fast, drill-powered expansion method as an alternative to manual expanders.
Technical Specifications
| Number of Pieces |
7 (1 × 5-in-1 step bit + 6 × individual swaging heads) |
| Material |
Bearing Steel |
| Shank Type |
Upgraded Hexagonal (Hex) Shank |
| Expansion Method |
High-temperature thermal expansion |
| Step Bit Sizes |
1/4 in (6 mm), 3/8 in (9 mm), 1/2 in (12 mm), 5/8 in (16 mm), 3/4 in (19 mm) |
| Individual Head Sizes |
S3/8, S1/2, S5/8, S3/4, S7/8 (+ 1 additional) |
| Compatible Tubing Material |
Copper |
| Compatible Systems |
HVAC split A/C, mini-split, vehicle A/C, residential plumbing |
| Weight |
230 g (approx. 8.1 oz) |
Frequently Asked Questions
What sizes does this set cover?
The 5-in-1 step bit covers 1/4 in (6 mm), 3/8 in (9 mm), 1/2 in (12 mm), 5/8 in (16 mm), and 3/4 in (19 mm). The 6 individual swaging heads cover S3/8, S1/2, S5/8, S3/4, and S7/8 (plus one additional size). Together the kit covers all standard residential copper tubing diameters.
What material are the bits made from?
All bits are machined from bearing steel, which provides the hardness and durability needed for repeated copper tube expansion without losing dimensional accuracy.
Why is the hex shank better than a round shank?
The upgraded hexagonal shank adapts to more drill chuck interfaces, bites and fixes more securely during operation, and does not roll off surfaces — unlike round-shank expanders which can slip in the chuck and are harder to control.
Will these bits work with my standard cordless drill?
Yes. The hex shank fits standard drill chucks and pneumatic (air) tools. A variable-speed drill is recommended for better control during expansion.
Is it safe to touch the copper pipe immediately after expanding?
No. The high-temperature expansion process causes the pipe to heat up significantly. Always wear gloves during operation and wait for the pipe to cool down completely before touching it.
How do I use the tool correctly?
Step 1: Choose the right-size head based on the inner diameter of the copper pipe. Step 2: Attach the bit to your electric drill. Step 3: Drill into the copper pipe mouth that needs expanding (thermal expansion of the pipe mouth is normal). Step 4: Twist until the handle cover of the expander head exits — expansion is complete. See the demo video for a visual walkthrough.
Can I use this on aluminium or steel tubing?
This set is designed and optimised for copper tubing. Using the bits on aluminium or steel is not recommended, as it may damage the bits or produce an inaccurate expansion.
Ready to expand copper pipe the fast, drill-powered way? Add the 7-Piece Copper Tube Expander Swaging Tool Bit Set to your cart and get the right fit for every HVAC and plumbing job.
