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1/4in Question

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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1/4in Question

Unread postAuthor: Mitchza89 » Tue Aug 07, 2007 4:39 am

Hey guys,

I need a 1/4in compression fitting that fitted 1/4in brass/copper pipe, ok.... 1/4in is 8mm..

Therefore does 1/4in pipe have an I.D of 6mm? or do I have everything really mixed up?
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Unread postAuthor: wannabie » Tue Aug 07, 2007 5:15 am

I think 1/4" has an id. of 8mm
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Unread postAuthor: f.c » Tue Aug 07, 2007 5:19 am

well if the o.d is 8mm then the i.d should be around 6mm.
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Unread postAuthor: jimmy101 » Tue Aug 07, 2007 12:44 pm

Nominal pipe sizes may or may not be close to an actual dimension of the pipe.

In L type copper tubing, 1/4" tubing is .375" OD (3/8"), and .315" ID. So the ID really is 8mm (actually 8.001mm). That assumes you have 0.035" walls. IIRC, the 1/4" pipe you get at the hardware store is the ".375" OD, .315" ID" stuff.

Mcmaster.com is a good place to look up things like pipe IDs, ODs, pressure ratings...
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Unread postAuthor: Mitchza89 » Tue Aug 07, 2007 6:41 pm

Thanks alot for that jimmy. Thats what I first thought. Looks like im back to the drawing board...

Cheers.
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