How To Connect Galvanized Pipe Without Threads: A Comprehensive Guide

How To Connect Galvanized Pipe Without Threads


To Connect galvanized pipe without threads can be challenging due to their rough surfaces and zinc coating. However, it is not impossible. This guide provides step-by-step instructions and various methods to connect galvanized pipe without threads, ensuring a reliable and leak-free connection.

Tools Required:

1. Hacksaw
2. Tape measure
3. Putty blade
4. Wrench

Step-by-Step Instructions:

Step 1: Determine Pipe Diameter

Use a tape measure to determine the outer diameter of each unthreaded galvanized pipe. Choose a standard coupling for similar diameters or a stepped coupling for different diameters.

Step 2: Examine Smoothness

Check the galvanized coating’s surface for roughness. Select a coupling that matches the surface texture for an optimal connection.

Step 3: Check Squareness

Verify the squareness of the non-threaded galvanized pipe using a level. If needed, use a hacksaw to achieve a flat end and a metal grinder to smooth any rough edges.

Step 4: Clean the Pipe

Clean the non-threaded galvanized pipes with water-based degreasers to remove dirt and grime. Mark the coupling placement on each pipe with a pencil.

Step 5: Install Pipes

Insert one end of the pipes into the coupler, aligning with the marked lines. Tighten fastening bolts evenly using a torque wrench until the coupler is securely attached.

Various Thread less Connection Methods:

1. Welded Processes:

– Fusion welding
– Pressure welding

2. Non-Welded Processes:

– Couplings
– Flange joints
– Pull joints
– Geb fittings

Considerations for Non-Threaded Connections:

1. Pipe Dimensions:

– Use standard couplers for similar pipe diameters.
– Employ stepped couplings for varying diameters.

2. Galvanized Surface Texture:

– Match coupling texture with the pipe surface.

3. Pipe End Squareness:

– Ensure right angles for seamless joint connections.

4. Connection Method:

– Choose between welding or non-welding techniques based on the situation.


Connect galvanized pipe without threads is achievable using various methods. This guide emphasizes the importance of considering pipe dimensions, surface texture, end squareness, and the chosen connection method for a successful and lasting connection.


1. How to connect a galvanized water pipe?
– Use galvanized pipe fittings or plastic/metal caps for temporary or permanent plugging. Soldering provides a long-lasting solution.

2. How to repair a rusted galvanized pipe?
– Replace the damaged part of the pipe, connecting the two ends securely.

3. Can compression fittings be used on galvanized pipes?
– Yes, compression fittings, including conditioner couplings, work well with galvanized pipes, whether threaded or non-threaded.

4. How to join galvanized and copper pipes?
– Connect galvanized and copper pipes using soldering, ensuring a smooth joint with sandpaper after cleaning.

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About the author


I am Ben , a seasoned HVAC specialist with over 6 of experience in the HVAC industry. I holds HVAC Certification and has a proven track record in providing expert advice on HVAC systems.