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Tool Talk Discussion Forum

Helicoil tap sizes

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Darren in TN

12-29-2004 06:51:28

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Howdy, all.

This is probably a really dumb question, but I need to make progress on a project in the shop, so here goes. Are helicoil taps proprietary/odd sizes, or are they just normal SAE and metric taps? I have some valve cover threads to repair that are M6x1.0 and I have found helicoils in town, but the taps and kits are a bit scarcer.

Thanks, and y"all have a blessed New Year.
Darren

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Larry E

12-29-2004 19:01:11

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Re: Helicoil tap sizes in reply to Darren in TN, 12-29-2004 06:51:28

Helicoils suck,to expensive ,need exact tap.
also only good for one use .Get threaded inserts ,they use standard taps ,can be locked in place with loctite.

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big fred

01-01-2005 16:09:10

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Re: Helicoil tap sizes in reply to Larry E, 12-29-2004 19:01:11

You're doing something wrong if your helicoils are only good for one use.

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Butch(OH)

12-29-2004 08:13:33

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Re: Helicoil tap sizes in reply to Darren in TN, 12-29-2004 06:51:28

The helicoil tap must have the same number of threads per inch as the fastener thus to answer your question, no they are not just a size or two larger Std tap. J&L supply (sorry no link handy) will have you the kit tomorrow if you get it ordered today before noon but they do get thier money for the fast service.

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Bob

12-29-2004 08:09:36

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Re: Helicoil tap sizes in reply to Darren in TN, 12-29-2004 06:51:28

McMaster DOES have the taps and kits. The tap sizes ARE proprietary. The tap is $10.91 at McMaster.

If you want to avoid buying a tap, check into "thread repair inserts". They have a stansard thread, a couple of sizes bigger than the original, but you'll need more metal around the hole, because you'll be making it considerably bigger. For 6.0MM the hole required for these is 3/8" NC or M10X1.5, although there may be some slighly thinner ones available.

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Butch(OH)

12-29-2004 08:14:49

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Re: Helicoil tap sizes in reply to Bob, 12-29-2004 08:09:36

Sorry Bob, you posted while I wus typen

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Fawteen

12-29-2004 07:57:06

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Re: Helicoil tap sizes in reply to Darren in TN, 12-29-2004 06:51:28

They are oversized. I don't think you can "go up to the next size" ie use a 5/16ths tap for a 1/4 helicoil, I'm pretty sure they're proprietary.

You can buy a kit with the drill, the tap, a handful of coils and an insert tool for the size you want, and then just buy extra helicoils as needed.

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Fawteen - Whoops

12-29-2004 07:58:22

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Re: Helicoil tap sizes in reply to Fawteen, 12-29-2004 07:57:06

Didn't read the post carefully enough. I see you know about the kits. You might check McMaster-Carr for kits if you can't find 'em locally.

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Darren

12-29-2004 06:52:37

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Re: Helicoil tap sizes in reply to Darren in TN, 12-29-2004 06:51:28

By the way, I have googled the stew out of this question and can't find a cross-reference or other guide anywhere.

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dr.sportster

12-29-2004 08:29:30

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Re: Helicoil tap sizes in reply to Darren, 12-29-2004 06:52:37

Some standard taps will coinside with helicoil taps but would not be marked as such.This outfit will have all helicoil kits and separate pcs.:MSC1800-645-7270;mscdirect.com They will send you a huge catalog of machine shop supplies with a large section of helicoil and other thread repair kits or individual drills,taps,and varius inserts.

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