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If you are new to vacuum equipment, terms such as KF and MF (ISO) flanges can easily be confusing.
In this article we will explain the difference between the two flange types in the simplest terms so that even beginners can follow.
A flange is, in simple terms, a component that connects piping (pipes) to equipment.
Because a vacuum state must be maintained, the flange forms a tight connection that prevents any air from leaking through.
In a single phrase, a KF flange is a 'compact flange designed for quick, simple connection'.
It has a structure in which a single clamp wraps around the entire assembly to secure it.
Features
✓ Secured in a single step with a clamp
✓ Very fast assembly and disassembly
✓ Can be installed without additional tools
Think of it as being secured by pinching it with a clamp.
The MF flange - also known as the ISO flange - is a large, robust flange designed for heavy-duty connections.
The components are larger and the fastening method is much stronger.
Features
✓ Secured with bolts or clamps
✓ Supports larger sizes
✓ Structurally more robust
Think of it as a steel structural assembly tightened firmly with bolts.
| Category | KF Flange | MF (ISO) Flange |
|---|---|---|
| Size | Small | Large |
| Connection Method | Clamp | Bolt / Clamp |
| Assembly Speed | Very fast | Relatively slow |
| Application | Laboratory, small equipment | Industrial, large equipment |
| Difficulty | Easy | Moderate |
➜ When a KF Flange Is the Better Choice
When the joint must be frequently disassembled and reassembled
For small equipment (laboratories, analytical instruments)
👉 Choose KF when ease of use is the priority.
➜ When an MF Flange Is the Better Choice
For large piping or chambers
When a strong, rigid connection is required
For industrial-scale equipment
👉 Choose MF when stability is the priority.
KF = Small and quick to connect
MF = Large and robust to connect
We hope this article has made the difference between KF and MF flanges easier to understand.
In the field, the most important point to remember is to select the right type for the application and size.
We will continue to share practical technical information that supports your day-to-day work.
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