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

<span style='color: #800000;'>Kadee O gauge coupler starter pack</span>Kadee O gauge coupler starter pack

Ref: KD-O-STARTER

All you need to get started with Kadee automatic un-coupling.

Revised contents list: April 2018

2 pairs No. 745 Medium Centreset (4 couplers)
2 Pairs No. 746 Long Centreset (4 Couplers)
1 x No 812 height gauge
1 x No.811 un-coupler (delayed action)
1 x 231 Grease-em lubricant
1 x 241 Dual tool for uncoupling and manipulating springs
1 x ST35 pack of 25 Self Tap screws 9.5mm

Fixing holes are approx 2.1mm - Gear boxes are approx 5.1mm thick


O Gauge starter pack instructions



Price: 47.00




<span style='color: #800000;'>Kadee 805 O gauge coupler</span>
Kadee 805 O gauge coupler - view 1Kadee 805 O gauge coupler - view 2
Kadee 805 O gauge coupler

Ref: KD805

Kadee 805 O Gauge coupling

MEDIUM CENTRE SET

ONE pair per pack (2 couplings)

This coupler features metal coupler and draft gear box and lid. Side, centre and end holes for mounting. Fixing holes 2.1mm approx. Gear box is approx 5mm thick.

THIS COUPLER HAS BEEN SUPERCEDED BY THE 700 SERIES - see No. 740 or 745 below


Kadee O gauge coupler Size chart



Price: 3.75




<span style='color: #800000;'>Kadee 740 O gauge coupler</span>
Kadee 740 O gauge coupler - view 1Kadee 740 O gauge coupler - view 2Kadee 740 O gauge coupler - view 3
Kadee 740 O gauge coupler - view 4  
Kadee 740 O gauge coupler

Ref: KD740

Kadee 740 O Gauge coupling

MEDIUM CENTRE SET - same dimensions and settings as No. 805 and No.745

This coupler features METAL COUPLER and METAL GEAR BOX and lid. Side, centre and end holes for mounting.

Direct Replacement for No. 805 coupler - Main difference is the knuckle spring is hidden - fully compatible with older types of Kadee O Gauge

Fixing holes 2.1mm approx. Gear box is approx 5mm thick.

Recommended Screws
Kadee No. 1688 (1-72 x 3/8") or
Self tapper ST35 9.5mm

TWO PAIRS per pack (4 Couplings)



Kadee O gauge coupler size chart



Price: 9.50




<span style='color: #800000;'>Kadee 742 O gauge coupler</span>
Kadee 742 O gauge coupler - view 1Kadee 742 O gauge coupler - view 2Kadee 742 O gauge coupler - view 3
Kadee 742 O gauge coupler - view 4  
Kadee 742 O gauge coupler

Ref: KD742

Kadee 742 O Gauge coupling

MEDIUM OVER SET

TWO PAIRS per pack (4 Couplings)


This coupler features metal coupler and PLASTIC GEAR BOX and lid (817 type). Side, centre and end holes for mounting.

Fixing holes 2.1mm approx. Gear box is approx 5mm thick.

Recommended Screws
Kadee No. 1688 (1-72 x 3/8") or
Self tapper ST35 9.5mm


Kadee O gauge coupler size chart



Price: 9.50




<span style='color: #800000;'>Kadee 743 O gauge coupler</span>
Kadee 743 O gauge coupler - view 1Kadee 743 O gauge coupler - view 2Kadee 743 O gauge coupler - view 3
Kadee 743 O gauge coupler - view 4  
Kadee 743 O gauge coupler

Ref: KD743

O Gauge coupling

This replaces No. 806

SHORT CENTRE SET

TWO PAIRS per pack (4 Couplings)


This coupler features METAL coupler and PLASTIC SHORT GEAR BOX and lid. Side, centre and end holes for mounting.

Fixing holes 2.1mm approx. Gear box is approx 5mm thick.

Recommended Screws
Kadee No. 1688 (1-72 x 3/8") or
Self tapper ST35 9.5mm


Kadee O gauge coupler size chart



Price: 9.50




<span style='color: #800000;'>Kadee 745 O gauge coupler</span>
Kadee 745 O gauge coupler - view 1Kadee 745 O gauge coupler - view 2Kadee 745 O gauge coupler - view 3
Kadee 745 O gauge coupler - view 4  
Kadee 745 O gauge coupler

Ref: KD745

Kadee 745 O Gauge coupling

MEDIUM CENTRE SET (identical dimensions to 805)

This coupler features METAL COUPLER and PLASTIC GEAR BOX (817 type) Side, centre and end holes for mounting.

Fixing holes 2.1mm approx. Gear box is approx 5mm thick.

Recommended Screws
Kadee No. 1688 (1-72 x 3/8") or
Self tapper ST35 9.5mm

TWO PAIRS per pack (4 Couplings)



Kadee O gauge coupler Size Chart



Price: 9.50




<span style='color: #800000;'>Kadee 746 O gauge coupler</span>
Kadee 746 O gauge coupler - view 1Kadee 746 O gauge coupler - view 2Kadee 746 O gauge coupler - view 3
Kadee 746 O gauge coupler - view 4  
Kadee 746 O gauge coupler

Ref: KD746

Kadee 746 O Gauge coupling

LONG CENTRE SET - ideal for most UK rolling stock and especially suitable for coaches and stock with long buffers.

TWO PAIRS per pack (4 Couplings)


This coupler features metal coupler and PLASTIC (817) GEAR BOX. Side, centre and end holes for mounting.

Fixing holes 2.1mm approx. Gear box is approx 5mm thick.

Recommended Screws
Kadee No. 1688 (1-72 x 3/8") or
Self tapper ST35 9.5mm


Kadee O gauge coupler Size Chart



Price: 9.50




<span style='color: #800000;'>Kadee 747 O gauge coupler</span>
Kadee 747 O gauge coupler - view 1Kadee 747 O gauge coupler - view 2Kadee 747 O gauge coupler - view 3
Kadee 747 O gauge coupler - view 4  
Kadee 747 O gauge coupler

Ref: KD747

Kadee 747 O Gauge coupling

MEDIUM UNDERSET

This underset coupler is sometimes better for locos and other stock as the gearbox is mounted about 3mm lower than a standard coupler.

TWO PAIRS per pack (4 Couplings)


This coupler features metal coupler and PLASTIC (817) GEAR BOX. Side, centre and end holes for mounting.

Fixing holes 2.1mm approx. Gear box is approx 5mm thick.

Recommended Screws
Kadee No. 1688 (1-72 x 3/8") or
Self tapper ST35 9.5mm


Kadee O gauge coupler Size Chart



Price: 9.50




<span style='color: #800000;'>Kadee No. 817 O gauge plastic gear box</span>Kadee No. 817 O gauge plastic gear box

Ref: KD817

O Gauge

Plastic draft gear box and lid

5 pairs (10 gearboxes) per pack




Price: 2.82




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. 241 Dual tool
No. 237 Trip pin pliers
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, 7mm.co. 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 7mm.co. from any and all injury, damage or loss arising from such use.
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