Athearn Roundhouse HO Scale Coupler Conversions

The perfect solution for all of your coupler woes. Thanks to our extensive list of HO Scale coupler conversions, it's easier than ever to fit Kadee® Couplers onto your locomotives and rolling stock. Our conversions typically require the least modification to your model, and the How-To Instructions and diagrams make fitting your new couplers a breeze. Remember to always check your coupler heights with our #206 Coupler Height Gauge. We've done the hard work for you, so find the perfect coupler in the list below.*

	Whisker® Metal Coupler	Standard Coupler	Other Coupler Options
Alco RS-3 Locomotive	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
EMD Model 40 Critter Locomotive	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
EMD F7 A/B Locomotive	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
EMD GP35 Locomotive	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
EMD GP38-2 Locomotive	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
EMD GP40-2 Locomotive	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
EMD GP50 Locomotive	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
EMD GP60 Locomotive	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
GE C44-9W / DASH 9-44CW Locomotive	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
GE AC4400CW Locomotive	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
Auto Loader Freight Car	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
Old Time Boxcar	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
Wood Boxcar	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
Single Sliding Door Boxcar	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
Grain Door Boxcar	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
High Cube Boxcar	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
Ribbed Boxcar	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
Double Sliding Door Boxcar	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
FMC 5283 Boxcar	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
Outside Braced Plug Door Boxcar	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
ACF Smooth Side Plug Door Boxcar	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
ACF 5077 (RailBox) Boxcar	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
Single Sliding Door Boxcar	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
Offset Double Plug Smooth Side Boxcar	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
Single Plug X-post Boxcar	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
Single Plug Smooth Side Boxcar	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
Single Plug Waffles Side Boxcar	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
30' 3-Window Caboose	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
30' Outside Braced Caboose	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
Drover's Caboose	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
Bay Window Caboose	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
Cupola Caboose	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
Eastern 2 Window Caboose	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
Eastern 4 Window Caboose	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
Wide Visio Caboosen Caboose	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
ACF 4 Bay Centerflow Covered Hopper	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
PS2 2003 Covered Hopper	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
40' Flat Flat Car	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
40' Pulpwood Flat Car	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
50' Flat Car	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
Heavy Duty Flat Car	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
40' Gondola	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
50' Gondola	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
Ore Hopper	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
2 Bay Composite Side Hopper	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
2 Bay Offset Side Hopper	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
2 Bay Rib Side Hopper	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
4 Bay Offset Side Hopper	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
Meat Reefer	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
Wood Ice Reefer	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
Steel Ice Reefer	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
Express Reefer	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
Outside Braced Mechanical Car	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
Smooth Side Mechanical Car	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
36' Old Time Stock Car	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
40' Stock Car	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
Chemical Tank Car	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
Single Dome Tank Car	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
Three Dome Tank Car	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
Standard Heavyweight Passenger Car	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
Baggage Passenger Car	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
Coach Passenger Car	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
Diner Passenger Car	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
Observation Passenger Car	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
Pullman Passenger Car	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
Railway Post Office (RPO) Passenger Car	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
Streamlined Passenger Car	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
Vista-Dome Passenger Car	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
Observation Passenger Car	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
Iron Horse Train Set	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
First Responder Train Set	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
Warbonnet Train Set	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158
Steamliner Train Set	#148	#5 (NO.5®)	#28, #58 or #118, #119, #158

Anywhere a NO.5® is listed, the #28, #58 or #118, #119, #158, #148 Whisker® Coupler can be used in its place.

Newer models that have factory-installed knuckle couplers are easily converted by using our standard head #148 or scale head #158 Whisker® Couplers.
If you need a longer coupler, use the #146 or scale head #156 Whisker® Coupler.

Shallow cast-on gearbox fix: If you have a Kadee® Coupler that is not moving freely back and forth in a shallow cast-on gearbox. This is because some clone knuckle coupler manufacturers started molding shallow cast-on gearboxes on their models to try to fix the problems with their drooping clone knuckle couplers. The fix is a simple one. You have to file the top of the coupler shank a few strokes with a file, usually just enough to remove the black coloring to make the Kadee coupler function correctly in the non-standard shallow cast-on gearbox.

*Our conversions are based on only one model from a production run; there may be inconsistencies in a model’s production run that require a different coupler or model modifications to achieve the proper coupler height for coupler function.

** Metal Coupler Note: It is not recommended to use a metal coupler directly on a metal surface to avoid the possible electrical crossover or shorting that may cause damage.

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Athearn Roundhouse HO Scale Coupler Conversions