Use the table below to determine the tap size of your watch stem. Measure the diameter the threads on the stem and use the table below to find the corresponding tap size.
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Stem Tap – MM Size Cross Reference Chart
About the Author: Esslinger Staff
When you say “measure the diameter” of the thread, do you mean major diameter or minor diameter? This is the standard machinist terminology for threads, so I’m wondering which I need to order (and therefore how to interpret my measurements). Thanks!
I’m looking for split stem for my mida wristwatch, the # I got off the back of the watch is 3394117 , 5057 ? I don’t know if it helps..
I don’t know what to get, please help me if you can, many thanks, Ralph
Please use our watch parts inquiry form found here: https://www.esslinger.com/watch-parts-inquiry/
Someone in the parts department will research your watch with the given information and get back to you as soon as they can with a price and availability of the parts you are looking for and answer any questions you may have.
I replaced a Seiko 8122A movement (tap 11 stem thread) with a VX42e movement ( tap 10 stem thread). The crown will not fit the new stem thread. This watch is from the late 1970s. It uses a Japanese waterproof crown. I have not been able to find a tap crown to fit the new stem. I wonder if I could use 88.600 stem extender to reduce the new tap 10 stem to a tap 11 and reuse the original crown. Thanks for your help. Bob Mayer
Please use our watch parts inquiry form found here: https://www.esslinger.com/watch-parts-inquiry/
Someone in the parts department will research your watch with the given information and get back to you as soon as they can with a price and availability of the parts you are looking for and answer any questions you may have.
I know what the OD of various threads are (ie tap 10 is 0.90 mm, tap 9 is 1.00 mm etc).
Is there a chart for the drill sizes for the same, when tapping .