How to Choose the Right Pneumatic Clamp for Aluminum Profile Width? KRT-110 41.15–90 mm Opening Guide

How to Choose the Right Pneumatic Clamp for Aluminum Profile Width? KRT-110 41.15–90 mm Opening Guide

Why Maximum Opening Alone Is Not Enough

When selecting a pneumatic clamp for aluminum profiles, the maximum opening is often the first specification users check. However, maximum opening alone does not determine whether a clamp will match the actual workpiece.

The confirmed dimensions of the KRT-110 pneumatic clamp are:

• Resting opening: 41.15 mm
• Maximum opening: 90 mm
• Overall length: 112 mm

These dimensions are useful because they help engineers evaluate the clamp against the actual clamping position, not simply the nominal profile width.

Problem | Why Can a Profile Below 90 mm Still Be Difficult to Clamp?

A common mistake is to compare only the overall profile width with the maximum opening.

For example, if an aluminum profile is listed as 80 mm wide and the KRT-110 can open to 90 mm, it may appear compatible.

In practice, several additional factors affect clamp selection.

Actual clamping-point width

The clamping location may contain ribs, raised edges, grooves, or locally thicker sections. Therefore, the dimension the clamp needs to cross may differ from the nominal profile size.

Clamping direction

The same aluminum profile can require different opening dimensions when clamped from different directions.

Initial loading clearance

Before reaching the maximum opening, the clamp starts from its resting position. This makes the 41.15 mm resting opening an important selection parameter.

Cause | Why Does Pneumatic Clamp Size Mismatch Happen?

The main cause is often failure to distinguish between overall profile dimensions and actual clamping dimensions.

The KRT-110 moves from a 41.15 mm resting opening to a 90 mm maximum opening.

The available opening difference is:

90 − 41.15 = 48.85 mm

The two dimensions serve different purposes.

The resting opening helps evaluate initial positioning and loading conditions, while the maximum opening defines the upper opening capability of the clamp.

If users focus only on the 90 mm maximum opening, the clamp may appear suitable on paper but still be difficult to position correctly in production.

Solution | How to Check KRT-110 Compatibility

Before selecting the KRT-110, measure the actual area where the clamp jaws will contact the aluminum profile.

The following information should be checked:

1. Actual clamping-point width
2. Local ribs or raised sections
3. Clamping direction
4. Available installation space
5. Initial clearance required during loading

Then compare the measurements with the KRT-110 specifications.

If the required opening is very close to 90 mm, selection should not be based only on the theoretical maximum. Jaw position and actual installation conditions should also be reviewed.

Application | When Is Opening Size Especially Important?

The KRT-110 is suitable for applications where clamp selection depends on different aluminum profile cross-sections.

Profiles may vary in wall thickness, raised areas, or overall geometry. In these situations, the defined 41.15 mm resting opening and 90 mm maximum opening provide practical dimensional references.

Its 112 mm overall length should also be considered when installation space is limited.

How to Choose

Step 1: Measure the clamping position

Do not rely only on nominal profile width. Use the actual contact area as the main selection dimension.

Step 2: Compare with the resting opening

Check whether the 41.15 mm resting opening provides suitable initial clearance.

Step 3: Verify the maximum opening

Confirm that the required opening remains within the 90 mm maximum.

Step 4: Check installation space

Compare the 112 mm overall length with the available fixture or equipment space.

Step 5: Use a profile drawing for irregular sections

For irregular aluminum profiles, provide a cross-section drawing, clamping direction, and key dimensions for more accurate clamp matching.

FAQ

What is the maximum opening of the KRT-110?

The maximum opening is 90 mm.

What does the 41.15 mm resting opening mean?

It is the initial jaw opening when the clamp is in its resting condition.

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

Not necessarily. Compatibility depends on the actual clamping position, profile geometry, and clamping direction.

Why is the 112 mm overall length important?

It helps determine whether the clamp can fit within the available equipment or fixture space.

Conclusion

Selecting the correct pneumatic clamp requires more than checking a maximum opening value. With a 41.15 mm resting opening, 90 mm maximum opening, and 112 mm overall length, the KRT-110 provides clear dimensional data for aluminum profile clamp selection.

The most reliable approach is to compare these dimensions with the actual clamping point, profile cross-section, and available installation space rather than relying only on nominal profile width.