Tri Clamp Dimensions & Sizing Guide

Tri Clamp fittings (also known as Tri Clover or sanitary fittings) are widely used in food, beverage, pharmaceutical, and biotech industries due to their hygienic design and ease of use. Understanding how Tri Clamp sizing works is essential for choosing the right components for your system.

1. How Tri Clamp Sizes Are Defined

Nominal Tri Clamp sizes refer to the outer diameter (D1) of the tubing, not the flange or clamp size.

2. What Makes a Complete Tri Clamp Connection?

A full Tri Clamp connection consists of:

• Two ferrules (welded or attached to tubing)
• One clamp (to secure the ferrules)
• One gasket (placed between the ferrules to ensure a seal)

All parts must match the same nominal size (e.g. 2") for a leak-free, secure connection.

3. How to Measure Tri Clamp Components

Here’s how to correctly identify sizing:

• Ferrule: Measure the Tri-Clamp clamp size (referred to as Ferrule OD in the image and table below), as well as the required pipe inner diameter (D2) or outer diameter (D1), depending on which is relevant or measurable in the specific situation.
• Clamp: Fits around the flange outer diameter  (Ferrule OD)
• Gasket: The outer dimension of the gasket depends on the Tri-Clamp size (Ferrule OD). Ideally — and especially in areas with sanitary requirements — attention should also be paid to the inner diameter of the gasket, selecting it to match the inner diameter of the pipe used (D2). This latter note applies to those Tri-Clamp sizes that can be used with pipes of different diameters

4. Tri Clamp Size Chart

The image below shows how the dimensions correspond to the Tri Clamp ferrule.

The table below shows common Tri Clamp sizes and corresponding measurements.

5. Sizing Tips

• Use a sizing chart or caliper to confirm measurements before ordering.
• Check material compatibility with your process (e.g. stainless steel grade, gasket type).
• Use reducers to connect components of different sizes when needed.

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