Iso Aluminum Alloy Double-wall Clamp Material Characteristics And Applications

An ISO aluminum double wall kf clamp uses a hollow ribbed body to cut weight while holding clamping force. The double wall section adds stiffness, so the body flexes less under bolt torque. Even axial force keeps the centering ring and O-ring compressed for a stable vacuum seal. This design fits ISO-KF flanges.

Why Aluminum Changes the Weight Equation

Stainless steel clamps add mass at every joint. A manifold with many ports gains weight. Aluminum cuts that mass by roughly two thirds for the same profile.

• Lower weight reduces strain on support frames

• Faster service work per shift

• Less load on portable vacuum carts

• Savings compound across every joint

How the Double Wall Adds Stiffness

A single thin wall bends under bolt torque. The double wall forms a closed section that resists bending. The ribbed inner layer carries load while the outer layer spreads it across the flange rim.

• Hollow section resists bending

• Ribbed inner layer carries load

• Outer wall spreads force

• Lower mass than solid stainless

Fit with ISO-KF Flange Standards

The clamp mates with ISO-KF flanges built to the same rim dimensions. A kf 16 clamp seats on smaller flanges. A kf25 clamp covers mid-size ports. The iso clamp body follows the standard profile, so it fits existing fittings without adapters.

Clamping Force and Seal Behavior

The clamp supplies axial force that presses two flange faces against a centering ring. The O-ring inside the ring compresses to form the vacuum seal. Even force around the rim keeps the seal tight.

Aluminum has a lower elastic modulus than steel. The double wall section adds geometric stiffness. The body flexes less under the same bolt load.

A centering ring positions the flanges and holds the O-ring. The clamp only supplies closing force, so any imbalance shows as a leak at the ring.

Installation and Maintenance

1. Confirm the flange size matches the clamp body.

2. Seat the centering ring and O-ring between the flanges.

3. Fit the clamp over both flange rims.

4. Tighten the bolt until resistance rises, then stop.

5. Inspect the O-ring at each service interval.

Check the clamp for bent walls or worn threads at service. An anodized surface resists scratches.

Common Applications

• Load-lock and transfer chamber ports

• Portable vacuum carts and skids

• Test stand and prototype manifolds

• Pump inlet and outlet joints

• Coating and deposition systems

An iso clamp with the double wall body suits lines opened often. Lower weight reduces fatigue during repeated assembly.

Frequently Asked Questions

Why use aluminum instead of stainless steel?
Aluminum cuts clamp weight by roughly two thirds. The double wall section restores stiffness lost by using a lighter material.

Does the aluminum clamp hold the same torque as steel?
The double wall geometry carries the bolt load. Follow the maker torque spec for the flange size and seal type.

What is the difference between a kf 16 clamp and a kf25 clamp?
Each size matches a different flange diameter. The kf 16 clamp fits the smaller port, and the kf25 clamp fits the mid-size port.

Can aluminum and stainless clamps be mixed on one line?
Yes. Both follow the ISO-KF profile, so they fit the same flanges and centering rings.

How often should the O-ring be replaced?
Inspect the O-ring at each service window. Replace it when flattening, cuts, or compression set appear.

ISO Aluminum Double Wall Clamp

• These single and double clamps are used (in conjunction with a centering ring with fitted o-ring) for mating ISO flanges. The ISO flange (also called Large ISO) is used for HV chamber ports and is available in two distinct styles; ISO-K which uses clamp fasteners and ISO-F which uses nut and bolt fasteners.

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