What Aluminum Profiles Can a 90 mm Maximum Opening Fit? KRT-110 Pneumatic Clamp Size Matching Guide

Problem | What Does a 90 mm Maximum Opening Really Mean?

When selecting a pneumatic clamp for aluminum profiles, users often start with the maximum opening.

The KRT-110 has a 90 mm maximum opening, which provides a relatively large available opening. However, this should not be interpreted as:

“Any aluminum profile below 90 mm will fit.”

Actual compatibility depends on the dimension at the real clamping point, the profile cross-section, and the clamping direction.

For example, an 80 mm-wide profile may include ribs or raised local sections that increase the required opening.

On the other hand, a profile with an overall width close to 90 mm may have a much narrower local clamping section.

Therefore, the 90 mm value should be treated as an upper dimensional reference, not a complete selection rule.

Cause | Why Does Maximum Opening Not Equal Profile Width?

1. Overall width and clamping-point width are different

Aluminum profiles often have complex geometries, including:

• Grooves
• Hollow sections
• Ribs
• Steps
• Different wall thicknesses

The clamp jaws usually contact only one local part of the profile.

This means the more useful selection dimension is the:

Actual Clamping Width

rather than the overall nominal width.

2. Clamping direction changes the required opening

The same profile can require a different opening depending on the direction in which it is clamped.

For example, a rectangular profile may require significantly different clearance when clamped from its narrow side compared with its wide side.

This is why clamping direction should always be checked together with maximum opening.

3. Resting opening affects initial loading

The KRT-110 has a 41.15 mm resting opening and a 90 mm maximum opening.

The dimensional difference is:

90 − 41.15 = 48.85 mm

The clamp does not remain fully open at 90 mm.

If the workpiece requires larger initial loading clearance, the 41.15 mm resting opening becomes an important part of the selection process.

Solution | How to Check Whether 90 mm Is Suitable

A more reliable method is to measure the real clamping section first and then compare it with the KRT-110 dimensions.

At minimum, check the following:

Actual clamping-point width

Measure the local section the jaws need to cross.

Profile geometry

For irregular profiles, check for ribs, protrusions, grooves, or steps.

Clamping direction

Confirm the direction in which the clamp enters and holds the profile.

Installation space

The KRT-110 has an overall length of 112 mm, so the clamp body must also fit within the available equipment or fixture space.

Application | Which Profiles Should Be Evaluated Against a 90 mm Opening?

A 90 mm maximum opening is especially useful as a reference for:

Medium-to-wide profile sections

When the actual clamping point is clearly larger than the 41.15 mm resting opening, pneumatic opening capability becomes an important factor.

Irregular aluminum profiles

Profiles with ribs or local protrusions should be evaluated based on the clamping section rather than overall width.

Multi-size production lines

If several aluminum profile sizes are processed on one line, each actual clamping point can be compared to determine whether one KRT-110 can cover multiple products.

How to Choose

Step 1: Measure the clamping point, not only overall width

The local contact section is the most useful dimension.

Step 2: Confirm clamping direction

Different directions can require different openings.

Step 3: Check the 41.15 mm resting opening

Verify whether the workpiece can be loaded and positioned properly.

Step 4: Check the 90 mm maximum opening

If the actual clamping dimension is close to 90 mm, do not rely only on the theoretical limit.

Step 5: Check the 112 mm overall length

Confirm that the clamp body fits within the available installation space.

FAQ

What is the maximum opening of the KRT-110?

The maximum opening is 90 mm.

Can every aluminum profile below 90 mm use the KRT-110?

Not necessarily. Actual compatibility depends on clamping-point dimensions, cross-section geometry, and clamping direction.

Why is the 41.15 mm resting opening important?

It defines the initial opening condition and can affect loading and positioning.

What if the profile dimension is close to 90 mm?

A profile drawing and the exact clamping point should be reviewed before final selection.

Conclusion

The 90 mm maximum opening of the KRT-110 is an important upper dimensional reference for pneumatic clamp selection, but it should not be treated as a universal profile-width limit.

A more accurate selection should combine the 41.15 mm resting opening, actual clamping width, clamping direction, and 112 mm overall length. This provides a more reliable way to determine whether the KRT-110 matches a specific aluminum profile.