Option 1 | Measure the Inside Diameter (ID) of the tube end:
Utilizing a measuring calipers, take a measurement on the inside of the tube fitting
Note this measurement as the Inside Diameter of the tube fitting.

See the reference guides below to find your DIN 32676 fitting size.

 

Option 2 | Measure the Outside Diameter (OD) of the flange end:
Utilizing a measuring calipers, take a measurement at the flanged end which is the widest part of your fitting utilized by clamps.

Note this measurement as the OD of Flange End of the tube fitting.
Note: DIN 10, 15 & 20 have the same flange OD.
Note: DIN 25, 32 & 40 have the same flange OD.
To determine your size, also measure the Inside Diameter (ID) from step #1

See the reference guides below to find your DIN 32676 fitting size.

 

 

Next, use your Inside Diameter (OD) measurement to determine fitting size:

The flange size is not equal to the DIN fitting size. In order to determine the correct size, please refer to the measurements table or note the Inside/Outside diameters labeled in the illustration below.

DIN 32676 Size OD of Flange End (mm) ID of Tube (mm) OD of Tube (mm)
10 34mm / 1.339″ 10mm / 0.393″ 13mm / 0.512
15 34mm / 1.339″ 16mm / 0.630″ 19mm / 0.748″
20 34mm / 1.339″ 20mm / 0.787″ 23mm / 0.906″
25 50.5mm / 1.988″ 26mm / 1.024″ 29mm / 1.142″
32 50.5mm / 1.988″ 32mm / 1.260″ 35mm / 1.378″
40 50.5mm / 1.988″ 38mm / 1.496″ 41mm / 1.614″
50 64mm / 2.520″ 50mm / 1.969″ 53mm / 2.087″
65 91mm / 3.583″ 66mm / 2.598″ 70mm / 2.756″
80 106mm / 4.173″ 81mm / 3.189″ 85mm / 3.346″
100 119mm / 4.685″ 100mm / 3.937″ 104mm / 4.094″
125 155mm / 6.102″ 125mm / 4.921″ 129mm / 5.079″
150 183mm / 7.205″ 150mm / 5.096″ 154mm / 6.063″