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Very Large UNC taps

Very Large UNC taps

Very Large UNC taps

(OP)
I'm looking for a source for a very large tap.

3.625-16 UNC 3B to be exact.

Any style will do. Any Ideas?

Thanks,
J

NX 6.0.5.3

RE: Very Large UNC taps

Designation is wrong, that is not a "standard series" size.  It will be called a 3.625-16 UN, not UNC.  You may need to call and have a custom tap made, or thread mill the part.

RE: Very Large UNC taps

BT is correct about the designation.  By the way, it is NOT a special, either, it is standard designation.  Quickest way to cut that thread would be to single-tool it on a cnc lathe, if it is a checkable and turnable part.

You could give this place a try:  http://www.tapsndies.com
 

It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.

RE: Very Large UNC taps

er . . .  chuckable part.

It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.

RE: Very Large UNC taps

Well, you'd want it to be checkable too. ;)

RE: Very Large UNC taps

As others have said, single-pointing (lathe) or thread milling (machining center) would be better approaches.  If lot size was small enough, you could even threadmill with the single-point tool (slow).

The tap would be an expensive, single-purpose tool.

Software For Metalworking
http://closetolerancesoftware.com
 

RE: Very Large UNC taps

Power House Tools has 1"-7" there 8 threads inch but you might can get them to make  3 5/8-16 if you need. My boss has 1-6 1/2 in them quite price from what I understand.
http://www.powerhousetool.com/taps.htm

RE: Very Large UNC taps

Depending on your budget a collapsible tap would work for this job if you cannot single point. Its been years since I have seen one in use but they are still available. You may even find one on the used market and have the inserts supplied to you.

http://www.landisthreading.com/Taps/collapsible.htm
 

RE: Very Large UNC taps

(OP)
BillPSU,

Thanks! That is pretty much exactly what I was looking for!

J

NX 6.0.5.3

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