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Old 10-25-2010, 07:25 PM
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Radio shaft tap

Not sure if this is the correct area to post this..... I'm looking for the correct tap for a radio shaft nut, I have a rotary switch for my DSC delay wipers that has the same thread pitch as my japan made 8 track radio shaft..... bottom line I am trying to use the original style bezel for a 67 camaro wiper knob and need to make a new retaining piece..... hince the tap. Any help in locating a purchase etc..... would be greatly appreciated.

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Old 10-25-2010, 11:58 PM
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shaft tap

If it is a jap radio I would like to say it is metric, if your other part is metric they could be the same pitch, you sometimes can change to us thread, if you have enough metal there. I would guess it is a big thread, so I would forget about finding out what size it is then buying a tap, for a one time deal. Call a machine shop in town or go to a jap car dealer and see if they would let you use a tap or have them do it. even a cheap tap of a bigger size would cost a few bucks just to use it once let them do it.

36 terraplane
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Old 10-26-2010, 03:51 AM
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it is a metric tap, .8 TPI, it would be impossible to retap it into a SAE thread pitch, I don't care what it would cost for a tap for a onetime deal, looking for where to purchase one.
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Old 10-26-2010, 05:16 AM
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Try Mcmasters Carr: http://www.mcmaster.com/#

or MSC: http://www1.mscdirect.com/industrial...tmDtl-_-PypClk

They have just about every tap or die you want.
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Old 10-26-2010, 05:28 AM
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.8 mm thread is very close to 32 tpi. what is the diameter of the shaft, hole size it fits in? most old car audio stuff...shafted radios...were that fine of a thread. may have some hardware laying around at work. just offering.
mark
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Old 10-26-2010, 11:48 AM
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Radio shaft thread

A lot of times if there are only a couple threads you can just screw it on if the shaft is a wee bit bigger, unless it is a real hard metal the shaft threads will re tap it to the shaft if there are say 3 threads. The finer the thread the better Chance you have. 32 TPI is a course thread 40 TPI would be the fine. AS far as getting a tap, a lot of good hardware stores carry metric, where you don't have to by a set, they are not high buck but will do. If you are going to re tap, make sure the tap is not leaning to one side, I would put the part in a vice and use a drill press and turn the belt by hand, move slowly down on the part, see if the threads will catch the tap, then kind of let the part pull the tap though.

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Old 10-27-2010, 04:46 PM
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Mark, thanks for the offer....... the shaft size is 8mm with a .80 tpi..... only thing I can find is a 8mm .75 tpi..... no worries I'm going to chuck the billet retaining bezel in a drill and use a die grinder turning in the oppisite direction and trim it down to fit.

BTW no need for a drill press to tap threads..... I often use a 18v drill to run the tap in.... works extremely well.
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