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View Full Version : Measuring DD shafts



s10cyncrvr
01-13-2008, 05:16 PM
How do they measure DD shafts. Is it the diameter of the shaft(A) or the distance between the two flat portions(B)?

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Rubes
01-14-2008, 10:11 AM
That would be "A". And the flat is something like 50% of the diameter. That is the width of the flat itself, not the distance between flats. I'll try and find it in the machinery handbook and post it if I find it. But really, it is the diameter of the shaft. Or else how would they specify a single D?

s10cyncrvr
01-14-2008, 11:51 AM
Alright, Thanks!

sellersrodshop
01-19-2008, 01:09 PM
ditto rubes comments. what gets tricky is a 1" DD shaft measures 3/4" between the flats. i see alot of people who take the flat measurement & order the wrong diameter shaft.