View Cart | Checkout | Items:,Value:

Products > Kadee Couplers > Kadee O gauge  > Kadee O Gauge Accessories

<span style='color: #800000;'>Kadee No. 308 under track magnetic uncoupler</span>Kadee No. 308 under track magnetic uncoupler

Ref: KD308

Permanent magnetic under the track delayed uncoupler for Kadee couplings.

This uncoupler is popular with On30 and O gauge modellers. If used for OO/HO the strong magnetic field generated may attract the steel axle in lightweight rolling stock and cause "wobble". For OO/HO the best uncouplers are the No. 321 and 322

(For O gauge 2 or 3 magnets stacked may be required - see data sheet)

1 Magnetic Uncoupler
1 Steel Intensifier Plate.

Caution : Contains lead compounds. Keep away from food products. Keep out of reach of children.

Data Sheet

Price: 4.00

<span style='color: #800000;'>Kadee 811 O gauge uncoupler</span>Kadee 811 O gauge uncoupler

Ref: KD811

Between the rails magnet for delayed uncoupling.

For O gauge Kadee couplers

One magnet per pack

Price: 4.00

Related products:
1. Kadee 811 O gauge uncoupler (Ref: KD811)
<span style='color: #800000;'>KADEE 812 O scale height gauge</span>KADEE 812 O scale height gauge

Ref: KD812

Kadee coupler height gauge.

1. Provides instant visual reference.

2. Accurately measures proper trip pin height above rail.

3. Checks wagon height to ensure gear box is mounted at correct height for a Centreset coupler.

Indispensible tool for fitting couplers

Price: 17.50

<span style='color: #800000;'>No. 1 Pozi Pan Self Tap x 9.5mm x 100 pack</span>No. 1 Pozi Pan Self Tap x 9.5mm x 100 pack

Ref: ST35-x-100-pack

Outer diameter 1.9mm

Suggested pilot hole 1.5mm

BZP Steel

Pack of 100


Price: 7.00

<span style='color: #800000;'>No. 1 Pozi Pan Self Tap x 9.5mm x 25</span>No. 1 Pozi Pan Self Tap x 9.5mm x 25


Outer diameter 1.9mm

Suggested pilot hole 1.5mm

BZP Steel

Pack of 25


Price: 2.75

<span style='color: #800000;'>Kadee No 1680 1-72 Hex Nuts</span>Kadee No 1680 1-72 Hex Nuts

Ref: KD1680

Stainless Steel

12 per pack

Price: 2.50

<span style='color: #800000;'>Kadee No. 1688 1-72 9mm screw</span>Kadee No. 1688 1-72 9mm screw

Ref: KD1688

1-72 screws for Kadee Couplings

3/8" (10mm) stainless steel

12 per pack

FITS O Gauge KADEE Couplers

Price: 3.20

<span style='color: #800000;'>Kadee No 1689 1-72 12mm screw</span>Kadee No 1689 1-72 12mm screw

Ref: KD1689

1-72 screws for Kadee Couplings

1/2" (12mm) stainless steel

12 per pack

FITS O Gauge KADEE Couplers

Price: 3.20

<span style='color: #800000;'>Kadee No. 247 1-72 Tap & drill</span>Kadee No. 247 1-72 Tap & drill

Ref: KD247

Kadee tap and drill set for 1-72 screws


1-72 Tap
1-72 Tap Drill (#53)
1-72 Clearance Drill (#48)

Ideal for fitting Kadee couplers

Tap & drill chart

Price: 5.95

<span style='color: #800000;'>Kadee No. 231 Grease-em</span>Kadee No. 231 Grease-em

Ref: KD231

This fine, dry graphite lubricant is specially selected for use with Kadee Couplers.

Also an excellent general purpose lubricant for use all around the layout to reduce friction in moving parts and bearing surfaces. Add a puff inside your Kadee couplers, move them back-and-forth a few times to burnish and enjoy smooth action of your couplers.

1x 5.5 gram tube

Price: 2.40

Kadee O Gauge Couplers - Information

The main benefits of using Kadee couplers are:

Delayed uncoupling. Only Kadee couplers allow you to pull a wagon from one siding and the push the wagon to another siding and drop it at any desired position.

Much easier to remove models from the rake by hand than chain link couplings as the Kadee couplers are not interlocked.
Operating Kadee couplers

1. Stop with the Kadee couplers over an uncoupler and back up slightly with the couplers still over the uncoupler, allowing slack to occur between couplers.

2. Pull forward bringing coupler off the uncoupler. Couplers will snap to the delayed position.

3. Back up, pushing the wagons(s) to the desired location. Do not permit slack to develop between couplers.

4. Pull forward, leaving the wagon(s) where desired. Kadee couplers will automatically return to normal coupling position.
Confused by Kadee coupler numbers and terminology -You're not alone!

The good news is that's it's not as complicated as you might think.

Trip pin: The steel wire extending below the knuckle.

Knuckle: The coupling head

Shank: The arm which fits in the gear box

Gear Box: The housing for the shank and spring.

Overset/centreset/underset? This refers to the shank position. The Kadee coupler height has to be at a set height.

O Gauge Chart - Download PDF

In O gauge, things are very straightforward. It's a case of modifying the rolling stock to ensure the Kadee coupler is at the correct height. This usually means adding a shim of plastic or brass to lower the mounting height or some slight filing to remove a little part of the buffer beam. As there is plenty of space it's quite easy and doesn't usually involve two much work. (Occaisionally the buffer beam is at exactly the right height!)

Recommendations for UK O gauge modellers:

No. 746 Long centreset coupler
No. 745 Medium Centreset coupler
No. 812 Height gauge - essential
No. 811 un-coupler
No. 231 Grease-em lubricant
No. ST35 9.5mm Self Tapping screws

The fixing holes in Kadee O couplings are approx 2.1mm and the gear box is approx 5mm thick so a screw length of 9-10mm (3/8") is recommended

Generally, a single screw through the centre is fine but depending on the configuration of the rolling stock it may be preferable to use the outer holes in some circumstances.

If you have trouble centreing the gear boxes then try using a smaller gauge screws. This will allow a little bit of play side to side.

Kadee couplers are not toys. They contain small parts and are unsuitable for childen under 14 years.

Disclaimer: Although we have taken care in preparing the information on this page, do not, and cannot guarantee the accuracy thereof. Use of information on this page is at your own risk and by doing so, you shall be deemed to indemnify from any and all injury, damage or loss arising from such use.
Your browser may be storing and showing out of date pages. Click the curved arrow or double arrow symbol at the top of your browser to refresh each page.

You can adjust your browser settings to make it check for new pages each time you visit a site.