In this section, find how to measure the universal joint and the tube to ensure proper replacement of your parts

Steps for measurement

Follow these simple steps and get all the information about your PTO type

Inner and Outer Tube

Measuring the Universal Joint

1. Take apart the universal joint

Disassemble the universal joint for measuring properly. Click the link below for a handy reference for replacing your U joint. PDF document from Weasler®.

2. Measure the U Joint

When you measure your universal joint, measure the length from one outer end to the other (D). You will also need to record the width of one end of the universal joint (C). Use these numbers to find the right size of a universal joint.

On the Comer type like this one, the snap ring should be of type B. If not, please review your choice of PTO shaft profile. ALL European PTO shaft drivelines are Type B snap ring.

3. Discover your PTO Shaft Series and Related Information

Click on the correct bearing diameter (C) and find all the information on your PTO model as well as the web link to the cross bearing and related parts



Series: 20 Series

Bearing Diameter (C): 23.8mm

Cap-to-cap Overall Length (D): 61.3mm

Snap Ring Type: B

Rated HP @ 540 RPM: 20

Rated HP @ 1000 RPM: 31

PART#: 1-0221

27mm (Check dimension D)


Series: 40 Series

Bearing Diameter (C): 27mm

Cap-to-cap Overall Length (D): 74.6mm

Snap Ring Type: B

Rated HP @ 540 RPM: 33

Rated HP @ 1000 RPM: 55

PART#: 1-0421

30.2mm (Check dimension D)


Series: 50 Series

Bearing Diameter (C): 30.2mm

Cap-to-cap Overall Length (D): 79.4mm

Snap Ring Type: B

Rated HP @ 540 RPM: 47

Rated HP @ 1000 RPM: 74

PART#: 2-0521

30.2mm (Check dimension D)


Series: 60 Series

Bearing Diameter (C): 30.2mm

Cap-to-cap Overall Length (D): 91.4mm

Snap Ring Type: B

Rated HP @ 540 RPM: 64

Rated HP @ 1000 RPM: 100

PART#: 3-0621

35mm (Check dimension D)


Series: 80 Series

Bearing Diameter (C): 35mm

Cap-to-cap Overall Length (D): 106mm

Snap Ring Type: B

Rated HP @ 540 RPM: 95

Rated HP @ 1000 RPM: 150

PART#: 3-0821



Series: 90 Series

Bearing Diameter (C): 41mm

Cap-to-cap Overall Length (D): 108mm

Snap Ring Type: B

Rated HP @ 540 RPM: 120

Rated HP @ 1000 RPM: 190

PART#: 3-0921

Measuring the Inner and Outer tube

The Comer PTO shaft, looks like a star. Only one corner is flat. Both inner and outer tubing are the same shape. The inside of the yoke has also the same shape.

Measure diameter (A) as shown on the picture.

For the next step, it is simpler but above all more precise to use a vernier. This tool will give you the exact thickness of the tube.

You can take the measurement anywhere on the tube, the thickness is the same.

For this model, the outer shaft tubing should be on the tractor side. The inner tube on the implement.

Cut your PTO shaft

Learn how to cut your PTO shaft to avoid damage to your tractor or implement but also serious injury. It's very simple, you'll see!

Complete PTO Shafts List

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Shear bolt for Bondioli & Pavesi size 4-6. 100 series.
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