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View Full Version : Wanted Tap!! 7/8-20 Heli coil



Mr.Machinist
07-01-2010, 03:54 PM
I need a tap to install a 7/8-20 heli-coils i know hole size, i just need the tap, please e-mail me anytime ill answer you, ive tryed everyplace!!

DR
07-01-2010, 04:53 PM
http://inpcars.com/thread-repair-kits/6.html

Willy
07-01-2010, 06:14 PM
Are you sure it's 7/8x20 and not 7/16x20?

HeliCoil doesn't make a 7/8x20 insert.

http://www.helicoil.in/pdf/HeliCoil%20Catalogue.pdf

Here's a page out of KBC's catalog showing popular STI (screw thread insert) taps.

http://www.kbctools.com/Can/PDF/c0121.pdf

I've got quite a few sti taps but haven't seen 7/8x20.

John Stevenson
07-01-2010, 06:56 PM
That helicoil catalogue is nowhere complete.
No gas thread inserts, no Britsh thread inserts and I have a lot of these on the shelf and made my helicoil.

Try here page 13

bottom of page.
http://www.afsrecoil.net/uploads/pdfs/taps_sizes_en.pdf

.

Willy
07-01-2010, 07:12 PM
Right you are John.
I had not though of carb fuel inlets.
I learned something today, who'd a thunk it.:o

I'm afraid I can't think of source for the tap, though I'm sure somebody here will have a source.

John Stevenson
07-01-2010, 07:21 PM
That was the link to the tap.

.

Willy
07-01-2010, 07:26 PM
Okay, I'm awake now.:D
How about that there's even a part #.

Here's another with a price and an a order form.

http://www.britishfasteners.com/mm5/merchant.mvc?Screen=PROD&Store_Code=BTF&Product_Code=5755&Category_Code=

John Stevenson
07-01-2010, 07:47 PM
No you aren't fully awake :D :rolleyes:

That's just a 7/8" x 20 British standard brass tap.
They aren't hard to get here although the price tag is a bit steep. I can get that tap for £12 here, about $17.

http://www.afsrecoil.net/uploads/pdfs/taps_sizes_en.pdf

The OP wants a helicoil tap which will be plus 7/8" to allow for the insert

Willy
07-01-2010, 07:56 PM
No you aren't fully awake :D :rolleyes:



Sleepy bastard, that's what I get for doing a 22hr. day yesterday, I'm going back to bed.
Maybe I can get that right!

Hogridnfool
07-01-2010, 11:19 PM
Canceled reply

luthor
07-02-2010, 06:52 AM
No you aren't fully awake :D :rolleyes:

That's just a 7/8" x 20 British standard brass tap.
They aren't hard to get here although the price tag is a bit steep. I can get that tap for £12 here, about $17.

http://www.afsrecoil.net/uploads/pdfs/taps_sizes_en.pdf

The OP wants a helicoil tap which will be plus 7/8" to allow for the insert

It is actually British Standard Cycle.

John Stevenson
07-02-2010, 07:19 AM
Confusing.
They have called it BSC but there is a B on the end of the 20 which usually denotes Brass thread.

Only relevant to the purists thought as in practice regardless of depths, radii etc they interchange with no problem.

I have ordered many a BSC thread only to be sent BSB

luthor
07-02-2010, 07:26 AM
Not quite John, BSC = 60 degree, BSB = 55 degree but what's a few degrees here and there.

jimmstruk
07-02-2010, 08:50 AM
If my measurements are correct a 15/16-20 tap should work for your problem. JIM

Mr.Machinist
07-08-2010, 05:44 PM
Some helpfull info to the readers, heli coil says hole should be 1 7/32 big, i am just wondering if the outside of the heli coil is a coarse thread and inside is fine?? I bought 7 inserts at 6.00$ ea. should be here in 3 weeks. the tap is really what i need!! Keep info coming, im watching or email me anytime , rbudney@comcast.net

John Stevenson
07-08-2010, 05:55 PM
for Fücks Sake Are You Blind ?

Two Different Threads Now.

read Post #4 Above.

luthor
07-08-2010, 08:26 PM
[QUOTE=Mr.Machinist] i am just wondering if the outside of the heli coil is a coarse thread and inside is fine??


Helicoils don't work that way, Keenserts do.

jimmstruk
07-08-2010, 09:53 PM
And, MrMachinist?,there is one hell of a difference between a heli-coil and a keensert. They use much different tools. JIM