Very Large UNC taps 1

[Jaydenn]

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

 

[btrueblood]

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.

 

[ornerynorsk]

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.

 

[ornerynorsk]

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.

 

[btrueblood]

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

 

[mrainey]

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

 

[johnchrc]

Jayden,

See attachment for thread info on your size.

This size is big enough to bore with insert. No need to tap.
3-5/8-16 3B is a Fine Pitch

- CJ

 

[UTcaveman]

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

 

[BillPSU]

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

 

[Jaydenn]

BillPSU,

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

J

NX 6.0.5.3