What Metal Gauges Are Used in Roll Forming? Thickness Guide

Metal gauge in roll forming refers to the thickness of the material being formed, usually measured in millimeters (mm) or gauge (ga). The range of gauges used depends on the product, application, and required strength.

In general, roll forming uses material from 0.3 mm up to 6.0 mm+, but most common applications fall within a narrower range.

The most common gauge ranges can be grouped by product type.

Light Gauge Materials (0.3 mm – 1.0 mm)

This is the most widely used range in roll forming, especially for roofing and cladding.

Typical thickness:

0.3 mm
0.4 mm
0.5 mm
0.6 mm
0.7 mm
0.8 mm
1.0 mm

Common applications:

Metal roofing panels
Corrugated sheets
Wall cladding
Trim and flashing
Lightweight panels

This range is popular because it is:

Easy to form
Cost-effective
Suitable for high-speed production

Medium Gauge Materials (1.0 mm – 3.0 mm)

This range is used for structural and semi-structural applications.

Typical thickness:

1.2 mm
1.5 mm
2.0 mm
2.5 mm
3.0 mm

Common applications:

C and Z purlins
Steel framing (stud and track)
Decking profiles
Cable trays
Structural channels

This range provides a balance between strength and formability.

Heavy Gauge Materials (3.0 mm – 6.0 mm+)

Used for heavy-duty structural applications.

Typical thickness:

3.0 mm
4.0 mm
5.0 mm
6.0 mm+

Common applications:

Heavy structural profiles
Guardrails
Automotive components
Industrial framing

These materials require:

More powerful machines
Stronger tooling
Slower production speeds

Gauge is sometimes referred to using the “gauge number” system (especially in the US), but this can be confusing because gauge numbers vary by material type.

For example:

24 gauge steel ≈ 0.6 mm
22 gauge steel ≈ 0.8 mm
20 gauge steel ≈ 1.0 mm

Because of this, most modern roll forming specifications use millimeters for accuracy.

Material type also affects gauge selection.

Common materials used in roll forming include:

Galvanized steel (GI)
Pre-painted steel (PPGI)
Galvalume (Al-Zn coated steel)
Aluminum
Stainless steel

Each material behaves differently during forming, even at the same thickness.

Choosing the correct gauge is critical.

If the material is too thin:

The product may lack strength
It may deform or dent easily

If the material is too thick:

It may exceed machine capacity
It increases cost unnecessarily

Correct gauge selection ensures:

Proper structural performance
Efficient production
Cost control

Machine capability is a key factor.

Each roll forming machine is designed for a specific thickness range. For example:

Roofing machine → typically 0.3 mm – 0.8 mm
Purlin machine → typically 1.5 mm – 3.0 mm
Heavy structural machine → 3.0 mm+

Running material outside the machine’s range can cause:

Tooling damage
Poor product quality
Machine failure

Another important factor is material strength (yield strength).

Two materials with the same thickness can behave very differently depending on their strength.

For example:

Standard steel → easier to form
High tensile steel → harder to form, requires stronger machines

This is why both thickness and material grade must be considered together.

Frequently asked questions:

What is the most common thickness in roll forming?
0.4 mm to 0.6 mm is most common for roofing and cladding.

What thickness is used for purlins?
Typically 1.5 mm to 3.0 mm.

Can roll forming handle thick materials?
Yes, up to 6 mm or more with the right machine.

Is gauge or mm better to use?
Millimeters are more accurate and widely used in modern specifications.

What happens if I use the wrong gauge?
It can cause product defects, machine damage, or poor performance.

In summary, roll forming uses a wide range of metal gauges depending on the application. Light gauge materials dominate roofing and cladding, while medium and heavy gauges are used for structural products.

Understanding the correct thickness for your product and matching it to your machine is one of the most important factors in successful roll forming production.