Aluminum Pneumatic Clamps Anodizing Fixture 135mm Integrated

Aluminum Anodizing Clamping Fixture

Product Overview

In aluminum profile anodizing production, a pneumatic clamp must solve more than a simple holding problem. Engineers need to determine whether the extrusion can enter the jaws smoothly, whether the clamp fits within the available rack space, and whether one clamp geometry can accommodate changes between different profile sections.

The KRT-087 Pneumatic Clamp combines an overall length of 135 mm, a resting opening of 18 mm, and a maximum opening of 81 mm.

The difference between the resting and maximum opening positions is 63 mm. This provides substantial jaw-opening movement while maintaining a relatively compact clamp body.

For aluminum extrusion plants processing different profile geometries, these three dimensions provide a practical basis for evaluating clamp-to-profile compatibility.

Problem: Why Is Profile Loading Difficult When Clamp Dimensions Are Not Properly Matched?

Aluminum anodizing plants commonly process architectural profiles, industrial extrusions, and customized sections from different extrusion dies.

These profiles can differ in total width, wall thickness, gripping edges, ribs, grooves, and projecting flanges.

When maximum jaw opening is insufficient, the intended gripping section may not enter the clamp directly. Operators may need to change the loading angle or reposition the profile before it can be placed correctly.

However, simply selecting a much larger clamp is not always the best solution.

The clamp must also fit into an anodizing rack together with neighboring clamps and workpieces. A larger clamp body can increase the space required between profiles.

The practical engineering question is therefore:

How can sufficient jaw-opening clearance be achieved without using an unnecessarily large clamp body?

Cause: Why Does Clamp-to-Profile Mismatch Occur?

The Overall Profile Width Is Used Instead of the Actual Gripping Dimension

A clamp normally contacts only a specific section of an aluminum extrusion.

This may be an edge, rib, flange, or designated gripping point.

For example, an extrusion may be wider than 81 mm overall while the actual section entering the jaws is only 35 mm.

In this case, an overall profile width above 81 mm does not automatically make an 81 mm maximum-opening clamp unsuitable.

Conversely, a smaller extrusion with a projecting flange or irregular geometry can require significantly more loading clearance.

For fixture selection, the actual gripping geometry is therefore more useful than overall profile dimensions alone.

The 18 mm Resting Opening Is Treated as a Minimum Clamping Size

The KRT-087 has a:

Resting Opening: 18 mm

This specification defines the jaw position when the clamp is in its resting condition.

It does not automatically mean:

Minimum Clamping Size: 18 mm

Actual usable gripping dimensions depend on profile geometry, gripping thickness, jaw contact position, and the mechanical operation of the clamp.

Insufficient Maximum Opening Restricts Profile Loading

The KRT-087 provides a:

Maximum Opening: 81 mm

This dimension answers an important application question:

Is there enough clearance for the intended section of the extrusion to enter the jaws?

For aluminum profiles with raised ribs, grooves, or irregular cross-sections, maximum opening can be one of the most important fixture-selection parameters.

Unlike general terms such as “wide-opening clamp,” 81 mm maximum opening provides a measurable engineering reference.

Clamp Body Size Is Ignored During Rack Layout

The KRT-087 has an:

Overall Length: 135 mm

This dimension affects how much physical space the clamp occupies on the rack.

When multiple profiles are installed close together, engineers must check whether the 135 mm clamp body interferes with neighboring fixtures, extrusions, or rack components.

Solution: Balance Compact Clamp Size with a Defined Maximum Opening

The KRT-087 combines:

Overall Length: 135 mm

Resting Opening: 18 mm

Maximum Opening: 81 mm

This dimensional configuration addresses two different fixture-selection requirements.

The 81 mm maximum opening provides loading clearance for different extrusion sections.

At the same time, the 135 mm overall length gives engineers a defined dimension for evaluating rack space and fixture arrangement.

For production lines processing multiple profile geometries, these values provide a more useful engineering reference than general marketing descriptions such as “large clamp” or “wide jaw clamp.”

What Does the 63 mm Opening Difference Mean?

Based on the confirmed dimensions:

81 mm − 18 mm = 63 mm

The KRT-087 therefore has a 63 mm difference between its resting and maximum opening positions.

This figure can be used to explain jaw-opening movement.

However, it should not be described as:

18–81 mm Clamping Range

Maximum opening, resting opening, and effective clamping range are different technical concepts.

Actual gripping suitability also depends on profile thickness, geometry, contact position, and application conditions.

Why Does the Serrated Jaw Design Matter?

The upper and lower jaws of the KRT-087 use a visible serrated contact structure.

Instead of creating only one smooth contact surface, the serrated geometry provides multiple mechanical contact positions between the clamp and the selected gripping area of an aluminum extrusion.

This structure is relevant when a defined edge or gripping section needs to be engaged.

However, serrated jaws alone do not provide sufficient evidence for claims such as:

High Clamping Force

Extra Strong Grip

XX% Higher Holding Force

A numerical clamping-force claim should only be used when verified N or kgf test data are available.

KRT-087 Technical Specifications

Application

Aluminum Profile Rack Loading Before Anodizing

Before aluminum profiles enter the anodizing process, they must be positioned and held on the rack.

For profiles with different cross-sectional dimensions, the 81 mm maximum opening provides a clear reference for evaluating whether the intended gripping section has sufficient loading clearance.

The actual section entering the jaws should be measured instead of relying only on total profile width.

Production Lines Processing Multiple Extrusion Sizes

A plant may process several architectural or industrial extrusion geometries on the same surface-treatment line.

In this situation, available jaw-opening space becomes an important clamp-selection factor.

The KRT-087 provides a 63 mm difference between its 18 mm resting opening and 81 mm maximum opening, giving engineers measurable opening data when evaluating different profile geometries.

Anodizing Racks with Limited Fixture Space

Clamp size also matters when many profiles are arranged on the same rack.

The KRT-087 has an overall length of 135 mm, allowing this dimension to be included directly in fixture-layout calculations.

Engineers should check the distance between the clamp body, neighboring workpieces, and other fixture components before final selection.

Irregular Aluminum Extrusion Profiles

Grooved, ribbed, flanged, or asymmetrical profiles should not be selected according to overall width alone.

For these profiles, a cross-sectional drawing should identify:

• intended gripping position

• gripping width

• material thickness

• profile loading direction

• projecting ribs or flanges

• available fixture space

This provides a more reliable basis for determining whether the 81 mm maximum opening is suitable.

How to Choose a Pneumatic Clamp for an Aluminum Anodizing Line

1. Identify the Actual Gripping Area

Start with the aluminum profile cross-sectional drawing.

Determine exactly where the clamp will contact the extrusion.

Avoid selecting a fixture using only total profile width or height.

2. Measure the Maximum Clearance Required During Loading

Consider the complete shape that must pass between the jaws during loading.

This may include ribs, raised edges, or projecting sections near the final gripping point.

The KRT-087 has a maximum opening of 81 mm.

If the required loading clearance exceeds 81 mm, a larger-opening fixture should be considered.

3. Leave Practical Clearance Near the Maximum Opening

A profile that requires exactly 81 mm of clearance should not automatically be considered an ideal match.

Actual loading can also be affected by extrusion tolerances, loading angle, rack position, and surrounding fixtures.

When profile dimensions approach the maximum opening, sample verification is recommended.

4. Do Not Treat 18 mm as the Minimum Gripping Dimension

The 18 mm specification defines the resting jaw position.

It does not establish the smallest aluminum section that can be clamped.

Thin or narrow profiles should be evaluated according to their actual gripping geometry.

5. Check the 135 mm Clamp Length Against Rack Spacing

When many profiles are loaded onto one rack, clamp-to-clamp spacing becomes important.

The 135 mm overall length should be checked against neighboring workpieces and rack components to prevent mechanical interference.

6. Use Cross-Sectional Drawings for Customized Profiles

For irregular aluminum extrusions, provide:

• profile cross-sectional drawing

• marked gripping point

• gripping width

• material thickness

• loading orientation

• available rack space

This gives engineers a much stronger basis for clamp matching than overall extrusion dimensions alone.

FAQ

What is the maximum opening of the KRT-087 Pneumatic Clamp?

The KRT-087 has a maximum opening of 81 mm.

This represents the maximum jaw-opening position and is mainly used to evaluate whether the intended gripping section has sufficient clearance to enter the clamp.

Can the KRT-087 clamp an 81 mm thick profile?

This cannot be determined from maximum opening alone.

The 81 mm dimension represents maximum opening, not a verified maximum clamping thickness.

Profile geometry, loading clearance, and gripping position must also be considered.

Is 18 mm the minimum clamping size?

No.

The 18 mm specification is the resting opening.

It should not be described as a minimum clamping dimension unless the effective gripping range has been tested and confirmed.

Why is the 63 mm opening difference useful?

The value is calculated from:

81 mm Maximum Opening − 18 mm Resting Opening = 63 mm

It provides a measurable way to describe the change between the two jaw positions and is more useful for technical communication than simply describing the clamp as “wide opening.”

Why does the 135 mm overall length matter?

Overall length affects the physical space required on an anodizing rack.

When multiple clamps and profiles are installed together, the 135 mm clamp body should be checked against available spacing to avoid interference.

What information should I provide before selecting a pneumatic anodizing clamp?

For more accurate selection, provide:

• aluminum extrusion cross-sectional drawing

• intended gripping location

• gripping-section width

• wall thickness at the gripping point

• loading orientation

• available fixture space

This information helps determine whether the 135 mm overall length and 81 mm maximum opening match the actual production application.