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post #1 of 5 Old 12-11-2008, 04:27 PM Thread Starter
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Question Thread size

I'm putting a self centering chuck on my x-mas list.

I measured the diameter of the spindle and they appear to be about 1"

The specs of the lathe state :spindle thread M30 x 3.5

Does this mean this isn't a 1 " thread?

The lathe is a small lathe called a Power mc1018
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post #2 of 5 Old 12-11-2008, 08:57 PM
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I don't think it is the same as 1"x8 thread. I'm not that sharp on metric sizes. I looked it up on the web and the major diameter is 27mm + a little. An inch is 25.4mm. I would look and see if you could find the actual metric size. I haven't seen this size in any of my catalogs.
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post #3 of 5 Old 12-12-2008, 12:32 AM
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M30x3.5 is not 1". You will have to find a adapter for the chuck you are ordering or have a machine shop make you one. M30x3.5 is metric 1" is english, google metric thread sizes for more info.

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post #4 of 5 Old 12-12-2008, 08:54 AM
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I was looking through a penn state ind. catalog last night to see what they had listed for thread pitches for chuck adapters. The closest and only metric size they listed was 33 x 3.5 . Are you sure yours is 30?
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post #5 of 5 Old 12-12-2008, 09:48 AM
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The most common sizes are 3/4x16, 1"x8, 1 1/4x8 and M33. Grizzly has a bastard size or 1"x12 which I think is actually a metal chuck size but they put it on a few of their lathes.
Overseas there should be some metric sizes we don't have. You might want to check with They make the Nova chucks and although they don't import that size to the US they may have that size for their overseas market.
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