The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - what size drill bit and tap for 3/8 heli-coil

supercheyenne · 09-15-2002, 01:03 AM

Well fast,
Your post is somewhat confusing.

I think what your asking is for a 3/8 helicoil tap? Which the answer would be a letter "X" drill (.397 diameter). And a 3/6-16 helicoil tap is the tap you would use. Those Items are usually sold together in one package (along with the actual helicoils) for consumer use.

Try your local hardware/automotive store. If they don't have them try a industrial supply store.

I sure would try a few different ideas first.

Is it sticking out any? If it is, grind two flats on it and try to get a wrench on it.

Heat it up real good and put some wax on it. As it cools the wax will seep into the threads.

Anyway, what I'm saying is. Helicoils are for after you screwed up the hole. Not before.

Good luck.............

09-15-2002, 01:03 AM	#10
supercheyenne Registered User Join Date: Dec 1999 Location: Newton, KS, U.S.A. Posts: 1,142	Well fast, Your post is somewhat confusing. I think what your asking is for a 3/8 helicoil tap? Which the answer would be a letter "X" drill (.397 diameter). And a 3/6-16 helicoil tap is the tap you would use. Those Items are usually sold together in one package (along with the actual helicoils) for consumer use. Try your local hardware/automotive store. If they don't have them try a industrial supply store. I sure would try a few different ideas first. Is it sticking out any? If it is, grind two flats on it and try to get a wrench on it. Heat it up real good and put some wax on it. As it cools the wax will seep into the threads. Anyway, what I'm saying is. Helicoils are for after you screwed up the hole. Not before. Good luck.............