3/4" air compeessor outlet - what size air tube?

I guess what I'm asking is...if it lists 3/4" outlet, does that mean 3/4" hose?
Or do they use O.D. on one and I.D. on the other?
 
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I have a quick-connect fitting screwed onto the output from my compressor (a 3/4" male pipe thread).
I then connect a 1/4' air line to that quick connect, which powers my impact wrench, air ratchets, drills, etc.
 
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If 3/4" is listed it is likely 3/4" NPT (pipe thread) for the outlet thread size. The 3/4" part is deceiving.

1/2" hose is preferred for volume but 3/8" is the widely available norm for auto repair, etc.
 
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Jackhammers need 3/4" air lines to run.
Air wrenches, drills, nail-guns, and such use 1/4"-3/8" air lines, mostly.
This.
If it's a towable constant volume it's meant for the former.
If it's a big stationary you're gonna manifold through your shop and have multiple stations operating at once, or run large pneumatics you might want to plumb the primary run in 3/4 pipe/tube.
Almost everything runs better with more volume to a point, but big hoses are obnoxious. For standard shop equipment up to 1" guns there's no need to go over 1/2" hose. 3/8" is a good compromise.
Make sure whatever regulator and dryer you get has enough flow or all the hose dia. in the world is useless.
 
It depends upon what you're using it for, the cfm required at the tool and the length of the pipe and hose.

For my 27cfm compressor, I've run a 1" PEX and 1-1/4" black pipe infrastructure across the two shops that the compressor supplies.

The 11cfm compressor on the welding trailer simply uses 3/8" ID air hose.

If you're feeding a sand blaster or air die grinder from a high CFM compressor, then go at least 3/4". On the other hand, if you're only 10 cfm and a small tank (<40 gallons), then 1/2" ID should be fine.
 
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