Best Place to get a G1/4 BSPP tap?

[C'DaleRider]

My DUH! BUt I'm sick, been up all day yesterday and all night tonight, so I re-edited it so much because all the drugs in me are making me see double and cloud my thinking a bit.

But I fixed it and added illustrations of NPT vs. BSPT/BSPP thread design. Please don't hesitate to let me know of any other faux pas you see. Thx!

[Waterlogged]

Ooopps! Faux pas of my own.

I should have highlighted the whole line. The size we use is most is BSPP 1/4" not NPT 1/4".

Also, to avoid possible confusion, change this

BSPT/BSPP threads per inch chart:
(Pipe size and pitch found in that size...bolded size is our most commonly seen size in watercooling)

1/8"....................28 TPI
1/4", 3/8"...........19 TPI (3/8" BSPP is the Thermochill radiator pipe size used in their inlet/outlet, also found in last generation Swiftech MCR-320 rads)
1/2", 3/4".............14 TPI
1" and all larger.....11 TPI

to "first generation". I think most of us currently here know what you mean but I think it might confuse some newbs down the road.

Everything else looks good.

[Martinm210]

Bottomless?

Sorry, couldn't help myself.

It seems it's been a very long time since you were on the floor of a shop. The styles of taps available are Bottoming, Plug, and Tapered. With a BSPP or NPSM, the only style tap available is a bottoming as there can't be any taper otherwise it's not a BSPP or NPSM.

Ok, it's a tap for threading holes that are "Bottomless" you know what I meant...lol...

Just because I worked in a shop didn't mean I knew the proper terminology. I did know what each was used for though.

For tapered I mean the taps that are cut tapered, not the actul threading tapered. All of my regular taps are cut at a taper for a good 1/3 the length of the tap except this one which tapers to full threads in the first 3 or so threads.

No problem when tapping on my mill or the drill press, but that would be less than fun tapping by hand without something to hold it plumb.

[Waterlogged]

Ok, it's a tap for threading holes that are "Bottomless" you know what I meant...lol...

Just because I worked in a shop didn't mean I knew the proper terminology. I did know what each was used for though.

For tapered I mean the taps that are cut tapered, not the actul threading tapered. All of my regular taps are cut at a taper for a good 1/3 the length of the tap except this one which tapers to full threads in the first 3 or so threads.

No problem when tapping on my mill or the drill press, but that would be less than fun tapping by hand without something to hold it plumb.

I should expand on that so ppl know what I talking about. Like I stated before, taps come in 3 basic styles (it then can get complicated from there but, that's another story). They are Bottoming, Plug and Taper. These names actually refer to the end of the tap that does the cutting and are for screw threads only. Pipe taps, have only one type per style of thread. That means if the pipe thread is a NPT or BSPT, the tap will be ground with the proper taper with the proper "finished" threads being somewhere near the middle of the taper. If the thread is NPSM or BSPP, it will have 2-3 thread chamfered starter threads and the rest will be ground straight (parallel).

Here's a bit more info on screw thread taps

Chamfer Length: Three types of hand taps, used both for hand and machine tapping, are
available, and they are distinguished from each other by the length of chamfer. Taper taps
have a chamfer angle that reduces the height about 8–10 teeth; plug taps have a chamfer
angle with 3–5 threads reduced in height; and bottoming taps have a chamfer angle with 11⁄2
threads reduced in height. Since the teeth that are reduced in height do practically all the
cutting, the chip load or chip thickness per tooth will be least for a taper tap, greater for a
plug tap, and greatest for a bottoming tap.
For most through hole tapping applications it is necessary to use only a plug type tap,
which is also most suitable for blind holes where the tap drill hole is deeper than the
required thread. If the tap must bottom in a blind hole, the hole is usually threaded first with
a plug tap and then finished with a bottoming tap to catch the last threads in the bottom of
the hole. Taper taps are used on materials where the chip load per tooth must be kept to a
minimum. However, taper taps should not be used on materials that have a strong tendency
to work harden, such as the austenitic stainless steels.

[Marci]

www.tapdie.com is the company I generally use & recommend when buying any taps... they'll ship internationally...

http://www.tapdie.com/html/taps__met...w_taps__b.html