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1/4 NPT in 1" plate: through hole dia?

1/4 NPT in 1" plate: through hole dia?

1/4 NPT in 1" plate: through hole dia?

(OP)
I'm in the field working on a powerplant oil modification: I need to add a 1/4 NPT fitting for a instrument vent through a bearing plate 1-1/4 thick.  Flow rate is not the issue, only the presence of the vent tubing itself.

Tapped hole dia = 7/16"  Tapped hole depth is not in question.   

But, and it may reflect too many days of 7x13 shifts, but I cannot explicitly find the through hole dia for the hole itself.   

ID of a standard 1/4 pipe .540 - but is irrelevent, sicne I'm hooking up tubing.  Since its a vent tube back out of the bearing assy, do I just specify a nominal 1/4" through hole, or run the 7/16 tapping drill through the plate as the through hole?

Thanks.

RE: 1/4 NPT in 1" plate: through hole dia?

(OP)
Lest anyone worry about nuclear configuration control: This is in a gas turbine, combined cycle plant, aft (outlet) oil bearing pedestal for the CT turbine.  

Not a nuclear-spec unit.  8<)

RE: 1/4 NPT in 1" plate: through hole dia?

Just specify the tap drill through, unless there is some physical reason on the other side not to.

Ted

RE: 1/4 NPT in 1" plate: through hole dia?

instrument vents are fine with 1/4" i.d. through holes
just make sure you know what is on the other side and use a collar stop
 

RE: 1/4 NPT in 1" plate: through hole dia?

(OP)
Understood.  

My thanks to all.  Robert

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