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kadee's and MTH

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  • Member since
    April, 2001
  • From: US
  • 340 posts
kadee's and MTH
Posted by blabride on Sunday, June 10, 2018 9:47 AM

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

  • Member since
    December, 2015
  • 3,867 posts
Posted by BigDaddy on Sunday, June 10, 2018 10:08 AM

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.

Henry

COB Potomac & Northern

By the Chesapeake Bay

  • Member since
    December, 2003
  • 79 posts
Posted by SROC99 on Monday, June 11, 2018 11:25 AM

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 

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