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1/6" x 28tpi tap & die.

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JasonB	14/08/2017 19:02:40
25215 forum posts 3105 photos 1 articles	Mick I think you read the title as 1/16" not 1/6" ONE SIXTH Even then M1.5 is not a standard size so would be a special, M1.6 is.
Phil P	14/08/2017 21:15:48
851 forum posts 206 photos	Jason You are right he does indeed mean ONE SIXTH or approx M4.2 in metric. Victorian cylinder musical boxes have some very strange threads. In fact they can vary in size on the same instrument and it's not wise to get any screws mixed up when trying to re-assemble one. I reckon they were all hand made and no two were exactly the same Phil Edited By Phil P on 14/08/2017 21:18:03
speelwerk	16/08/2017 14:44:31
464 forum posts 2 photos	OK, not the greatest engineering event making 10 screws of 1/6" x 28, but musical box restoration is much donkey work before it gets interesting, on the rigth is one of the damaged original screws. Asked a quote for a special made die, if they give it will I let it know. Niko.
Phil P	16/08/2017 17:07:23
851 forum posts 206 photos	Niko The 28 tpi is very close to 0.9mm pitch. Probably not a solution to your immediate problem, but I have loads of spare M5 x 0.9 taps if you would like any. Phil
speelwerk	16/08/2017 18:57:20
464 forum posts 2 photos	Phil, thank you for your offer but I have that one with corresponding die. I did consider going to M5 but the washer only had a bore of 4.6 mm, and being made from that very hard and brittle material are not easy enlarged. Niko.

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