How to Choose the Right Pipe Clamp Size

Choosing a pipe clamp sounds simple.

Measure the pipe, find the matching clamp and bolt it into place.

But there's a catch.

The pipe's nominal size isn't always the clamp size you need.

Pipe, tube and hose dimensions can be specified differently, and DIN 3015 clamp systems are selected according to the actual outside diameter, application, loads and operating conditions.

Get the size wrong and the clamp may not properly support the pipe.

Get it right and you've got a secure, stable support system that can also help control movement, vibration and noise.

What Size Pipe Clamp Do I Need?

The best place to start is the outside diameter of the pipe, tube or hose.

Measure the outside diameter in millimetres and match it to the clamp's specified bore or clamping diameter.

For example, a pipe with an outside diameter of 22 mm needs a clamp designed for that diameter, not simply whatever product is labelled "¾ inch" without checking the actual dimensions.

Clamp manufacturers specify clamp sizes by bore diameter and provide the corresponding pipe or tube outside diameter.

A simple starting point

Measure the outside diameter → identify the required clamp size → select the appropriate clamp series → choose the body and hardware materials → select the mounting arrangement.

But there's more to it than diameter.

Step 1: Measure the Outside Diameter

Before selecting a clamp, establish exactly what you're supporting.

You might be working with:

• Stainless steel pipe

• Carbon steel pipe

• Aluminium pipe

• Hydraulic tube

• Pneumatic tube

• Rubber hose

• Process pipe

• Instrumentation tube

Measure the outside diameter, not the inside diameter.

A vernier caliper is ideal for smaller pipe and tube. For larger pipe, a suitable tape or diameter measurement method can be used.

If you're working from drawings rather than the physical pipe, check the manufacturer's dimensional information rather than assuming the nominal size equals the outside diameter.

Pipe Size and Tube Size Aren't Always the Same

This is one of the easiest mistakes to make.

Pipe and tube can use different sizing conventions.

For example, a nominal ¼-inch tube has an outside diameter of approximately 6.4 mm, while a nominal ¼-inch pipe has a much larger outside diameter. HYDAC gives this exact example in its pipe clamp guidance: a ¼-inch tube requires a 6.4 mm bore, whereas ¼-inch pipe requires approximately a 13.7 mm bore.

So don't order a clamp based solely on the words "¼-inch", "½-inch" or "1-inch".

Check the actual outside diameter.

That's particularly important when working across metric and imperial pipework.

Step 2: Match the Clamp Bore to the Pipe

Once you've established the outside diameter, select the clamp with the corresponding bore size.

For example:

The exact clamp product and series still need to be checked against the manufacturer's dimensional table and application requirements.

Step 3: Choose the Right Clamp Series

Diameter tells you how big the clamp needs to be.

It doesn't tell you which type of clamp you should use.

DIN 3015 systems are available in different series for different applications.

Common configurations include:

Standard / Light Series

Suitable for many normal industrial pipe and tube applications.

These are commonly used where loads and operating conditions fall within the relevant standard-series specifications.

Heavy Series

Heavy-duty clamp configurations are designed for more demanding applications and larger pipe diameters.

They can be appropriate where the installation is exposed to higher mechanical loads, pressure surges or other demanding conditions.

Twin Clamps

Twin configurations allow two parallel pipe or tube runs to be supported within one compact clamp arrangement.

They're useful when multiple lines need to be routed together.

DIN 3015 systems include light, heavy and twin configurations, with the appropriate series selected according to the application and loads.

Step 4: Decide Whether You Need a Grooved or Smooth Bore Clamp

The pipe diameter isn't the only consideration.

The inside profile of the clamp matters too.

Grooved clamps

Grooved internal clamp bodies are commonly used for rigid pipe and tube.

The internal profile helps locate and grip the pipe while allowing the clamp halves to be tightened correctly.

Smooth bore clamps

Smooth bore clamps are commonly used for hose applications.

The smoother internal surface is intended to support hose without the ribbed or grooved profile used for rigid pipe and tube.

For Kova Clamps, Air Energy recommends grooved internal clamps for pipe and tube applications and smooth bore clamps for hose applications.

Step 5: Consider the Pipe Material

Different pipe materials behave differently under load and temperature changes.

You might be supporting:

• Stainless steel

• Carbon steel

• Aluminium

• Copper

• Plastic

• Hydraulic tube

• Rubber hose

The clamp needs to be suitable for the pipe material and the operating environment.

This becomes particularly important when supporting plastic or composite pipe, where thermal expansion and material properties can differ significantly from steel pipe.

Step 6: Choose the Clamp Body Material

Kova Clamps are available in several body materials, depending on the configuration.

Options include:

• Polypropylene

• Polyamide

• Aluminium

• Steel

• Stainless steel

• POM

The right choice depends on temperature, chemical exposure, mechanical loading, corrosion conditions and the pipe being supported.

For example, a clean indoor installation may have very different material requirements from a marine or offshore application.

Step 7: Choose the Hardware Material

Don't overlook the bolts, plates and other metal components.

Air Energy supplies clamps configurations with different hardware options, including galvanised steel and stainless steel.

For a corrosive environment, stainless steel hardware may be appropriate.

For clean, dry and non-corrosive environments, galvanised hardware may be suitable depending on the application.

The hardware should be selected for the environment rather than simply matching the pipe material.

Step 8: Think About Pipe Clamp Spacing

Choosing the correct clamp size is only half the job.

You also need to determine how many clamps you need and where they should go.

A long unsupported section of pipe can move more than a well-supported section.

DIN 3015 installation guidance provides recommended maximum support distances based on pipe diameter. For example, the guidance lists support distances of up to 1.5 m for pipe diameters from 22 to 32 mm and up to 3.7 m for pipe diameters from 76.1 to 88.9 mm.

These figures are guidance from the referenced DIN 3015 clamp manufacturer's installation information, not a universal spacing rule for every pipe material or application.

Actual support spacing should take account of pipe material, temperature, fluid weight, pressure, vibration and applicable engineering requirements.

Bends Need Additional Consideration

A straight pipe run isn't the same as a pipe with multiple bends.

Changes in direction can introduce additional forces into the pipework.

DIN 3015 installation guidance recommends clamping pipework on both sides of bends, with the direction of pulsation also taken into account.

So when you're calculating clamp requirements, look at the entire pipe route, not just the length of straight pipe.

Valves Need Support Too

A valve can add considerable weight to a pipe system.

And depending on the valve and application, operating forces can also affect the pipe.

For this reason, DIN 3015 guidance recommends providing support in front of and behind valves incorporated into pipelines.

Don't assume the pipe itself should carry the entire weight of a large valve.

What Happens If the Clamp Is Too Large?

A clamp that's too large may not properly grip or support the pipe.

That can allow:

• Pipe movement

• Vibration

• Noise

• Sliding

• Mechanical stress

• Movement during pressure changes

The clamp should be selected to provide the intended support without being forced into an unsuitable configuration.

What Happens If the Clamp Is Too Small?

A clamp that's too small simply won't fit correctly.

Trying to force the wrong clamp onto a pipe can damage the pipe, clamp or hardware and compromise the support arrangement.

Don't modify the clamp to make it fit.

Choose the correct size.

Pipe Clamp Size vs Pipe Nominal Size

This is worth repeating because it's such a common source of confusion.

Nominal pipe size is not necessarily the same as outside diameter.

For example, a DIN 3015 clamp catalogue may specify a clamp by a bore such as 21.3 mm or 33.7 mm rather than simply calling it a "½-inch" or "1-inch" clamp.

HYDAC's product data shows examples where the clamp bore and corresponding pipe size are explicitly listed together.

When ordering, use the manufacturer's actual dimensional information.

Kova Clamp Sizes

Air Energy supplies Kova Clamps across a broad range of sizes and configurations.

For the current Kova range, sizes extend from small tube applications through to larger industrial pipework, with stock extending to approximately 88.9 mm in the configurations supplied by Air Energy.

That makes the range suitable for applications from smaller instrumentation and pneumatic lines through to larger industrial pipe systems.

Browse Kova Clamps

Example: Choosing a Clamp for Stainless Steel Pipe

Let's say you're supporting a stainless steel pipe with an outside diameter of 28 mm.

Here's how I'd approach it.

1. Confirm the actual OD

Measure the pipe and confirm it's 28 mm.

2. Identify the application

Is it:

• Compressed air?

• Water?

• Hydraulic fluid?

• Process fluid?

• Another application?

3. Select the clamp type

For rigid stainless steel pipe, select the appropriate grooved clamp configuration.

4. Select the clamp size

Choose the clamp designed for approximately 28 mm outside diameter.

5. Select the body material

Choose the clamp body material based on temperature, environment and mechanical requirements.

6. Select the hardware

For a corrosive environment, consider the appropriate stainless hardware.

7. Determine support locations

Calculate the required support points based on the pipe, fluid, operating conditions, bends, valves and applicable installation requirements.

That's a much safer process than simply searching for a "28 mm pipe clamp" and buying the first result.

How to Choose a Kova Clamp

For Air Energy customers, the process is straightforward.

Tell us:

1. Pipe, tube or hose

2. Outside diameter

3. Pipe material

4. Application

5. Operating temperature

6. Pressure

7. Environment

8. Expected vibration or movement

9. Preferred mounting method

From there, the appropriate Kova Clamp configuration can be identified.

For specialist applications, Air Energy's technical team can help work through the available options.

Pipe Clamp Selection Checklist

Before ordering, check:

☐ Actual outside diameter measured

☐ Pipe, tube or hose identified

☐ Grooved or smooth bore selected

☐ Correct clamp series selected

☐ Clamp body material suitable

☐ Hardware material suitable

☐ Operating temperature considered

☐ Pressure and pressure fluctuations considered

☐ Pipe weight considered

☐ Fluid weight considered

☐ Vibration considered

☐ Clamp spacing considered

☐ Bends and valves supported appropriately

☐ Mounting arrangement confirmed

Frequently Asked Questions

How do I know what size pipe clamp I need?

Start by measuring the outside diameter of the pipe, tube or hose. Match that measurement to the clamp manufacturer's specified bore or clamping diameter. Don't rely on nominal pipe size alone.

Should a pipe clamp be the same size as the pipe?

The clamp should be designed for the actual outside diameter of the pipe. The nominal pipe size and outside diameter aren't always the same, particularly when comparing pipe and tube.

Do I measure the inside or outside diameter for a pipe clamp?

Measure the outside diameter of the pipe, tube or hose. Clamp selection is based on the diameter being supported.

What size clamp do I need for 22 mm pipe?

If the pipe has an actual outside diameter of 22 mm, select a clamp designed for approximately 22 mm OD and then confirm the appropriate series, material and mounting arrangement for the application.

What size clamp do I need for 28 mm pipe?

For pipe with an actual 28 mm outside diameter, select the corresponding 28 mm clamp size within the appropriate clamp series.

Are pipe clamps measured in inches or millimetres?

They can be specified in either system depending on the manufacturer and application. DIN 3015 clamp systems commonly provide dimensions in millimetres. Always check the actual dimensional specification.

What's the difference between a pipe clamp and a tube clamp?

Pipe and tube can have different outside diameters even when they share the same nominal size. The clamp must therefore match the actual OD rather than simply the nominal designation.

How far apart should pipe clamps be?

There isn't one spacing distance that applies to every pipe system. Support spacing depends on pipe diameter, material, weight, temperature, fluid, pressure and other loads. DIN 3015 guidance provides recommended support distances for its clamp systems, which should be considered alongside the requirements of the actual installation.

Can Kova Clamps be used for stainless steel pipe?

Yes. Kova Clamps can be used to support stainless steel pipework. The correct clamp size, body material, hardware and mounting configuration should be selected for the specific application.

Can Kova Clamps reduce pipe vibration?

Yes. The clamp body provides a degree of damping between the pipe and mounting structure. DIN 3015 systems are designed to damp shocks, vibration and noise.

Need Help Choosing the Right Pipe Clamp?

If you're unsure which Kova Clamp you need, don't guess from the nominal pipe size.

Give Air Energy the pipe or tube outside diameter, application and operating conditions, and we can help identify the appropriate configuration.

View Kova Clamps

Or contact Air Energy on 1300 99 55 26.