kadee's and MTH

Model Railroader General Discussion (Model Railroader)
1

I seem to have lost or maybe used the couplers that came with my MTH SD70’s. I would rather put Kadee 5’s on them anyway. There is a hole ready for the center of the Kadee pocket in the right spot but a 2/56 won’t thread the hole.

Does anyone know what size screw fits this hole? Is a 1/72 the next size down from a 2/56?

Thanks

SB

2

I built a spread sheet with all sorts of little details of screws, drill bits, numbered drill bits and their actual diameter. Things that I can’t possibly remember.

  • size outside diameter" tap drill size
  • 0-80 0.6 56
  • 1-72 0.073 53
  • 2mm 0.78 52
  • 2-56 0.86 50

Kadee makes a drill and a tap (#246) for 2-56 and I use it all the time, though some people claim you don’t have to tap styrene.

** outside diameter is not the drill size, it is the maximum diameter of the screw.

3

SB, MTH normally uses metric screws like a 2mm is close to a 2-56 but not quite. A 1-72 will thread into a metric threaded hole of appropriate size. If you can’t find a metric screw just drill and tap the hole for a 2-56 screw.

Sam Clarke

Kadee Quality Products