What size drill bit for a 14mm tap?

CDN_Stalker · January 19th, 2006, 13:10

One of my boys, Quantis, is looking to start making some homemade supressors, I got him the 1.5" aluminum bar stock, figured I'd slice it and have it bored for him since he has little in the way of metal working tools. I don't have a tap to go by, so I figured I'd ask on here so I can tell the machinist what size bit to use to bore it properly, then I'll cut the slices.

Thanks

Stalker

MadMax · January 19th, 2006, 13:36

http://www.newmantools.com/tapdrill.htm

CDN_Stalker · January 19th, 2006, 13:58

Thanks Carl, just found this as well:

http://www.boltdepot.com/fastener-in...rill-Size.aspx

Have to sort out what tap it is, wasn't aware of 14 x 1.5, 14 x 2.0, etc. Guess it's safe to go by a ~12mm drill bit.

Quantis · January 19th, 2006, 15:49

I got it checked. The threads are 14mm x 1 (Left or right hand depending on gun)

CDN_Stalker · January 19th, 2006, 16:54

Asked the machinist if he could bore the peice of 6061 aluminum with a 12.Xmm (SAE equivalent) drill bit, that should be good enough. No idea when he'd be able to do it though, they are pretty busy in there these days. Might be done now, maybe tomorrow, maybe next week. Don't want to pressure him for it, so I'll check next week.

vondnik · January 19th, 2006, 18:37

I can confirm the threads are 14mm x 1.0 usualy CCW. Just for your information the tap and DIe set for CCW ( 1 tap+ 1 die) is about 300$ with a 1 month lead time. For CW thread it's about half that price. Only one compagnie has them listed in their chatalog, but most toolmaker will cut custom taps for you but as with all cuistom stuff it's going to be a killer...Better off making then on the lathe if you only plan on making a few.

as for drill size:

14mm x 2.0 ---> 12.0 mm
14mm x 1.5 --->12.5 mm
14mm x 1.0 ---> 12.5 mm

CDN_Stalker · January 19th, 2006, 18:55

Good info to have. Bawbag said he has a 14mm CCW (or CW, can't recall) tap that he bought, and chances are high that he didn't pay a lot for it, he's not even 20 yet!! Wonder where he got it from. Still, this is turning out to be a somewhat useful thread.

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January 19th, 2006, 13:10	#1
CDN_Stalker Official ASC Bladesmith Trader rating Join Date: Jul 2003 Location: Ottawa, Ont.	What size drill bit for a 14mm tap? One of my boys, Quantis, is looking to start making some homemade supressors, I got him the 1.5" aluminum bar stock, figured I'd slice it and have it bored for him since he has little in the way of metal working tools. I don't have a tap to go by, so I figured I'd ask on here so I can tell the machinist what size bit to use to bore it properly, then I'll cut the slices. Thanks Stalker __________________ STKR Knives http://www.facebook.com/#!/pages/STK...17036668380871

January 19th, 2006, 13:36	#2
MadMax Delierious Designer of Dastardly Detonations Trader rating Join Date: Dec 2001 Location: in the dark recesses of some metal chip filled machine shop	http://www.newmantools.com/tapdrill.htm __________________ Want nearly free GBB gas?

January 19th, 2006, 13:58	#3
CDN_Stalker Official ASC Bladesmith Trader rating Join Date: Jul 2003 Location: Ottawa, Ont.	Thanks Carl, just found this as well: http://www.boltdepot.com/fastener-in...rill-Size.aspx Have to sort out what tap it is, wasn't aware of 14 x 1.5, 14 x 2.0, etc. Guess it's safe to go by a ~12mm drill bit. __________________ STKR Knives http://www.facebook.com/#!/pages/STK...17036668380871

January 19th, 2006, 15:49	#4
Quantis Trader rating Join Date: Nov 2004 Location: Ottawa	I got it checked. The threads are 14mm x 1 (Left or right hand depending on gun) __________________ I take photos: www.fasttrackphoto.com

January 19th, 2006, 16:54	#5
CDN_Stalker Official ASC Bladesmith Trader rating Join Date: Jul 2003 Location: Ottawa, Ont.	Asked the machinist if he could bore the peice of 6061 aluminum with a 12.Xmm (SAE equivalent) drill bit, that should be good enough. No idea when he'd be able to do it though, they are pretty busy in there these days. Might be done now, maybe tomorrow, maybe next week. Don't want to pressure him for it, so I'll check next week. __________________ STKR Knives http://www.facebook.com/#!/pages/STK...17036668380871

January 19th, 2006, 18:37	#6
vondnik Ban-Fu Sifu Trader rating Join Date: Nov 2002 Location: Socialist republic of Kebekistan	I can confirm the threads are 14mm x 1.0 usualy CCW. Just for your information the tap and DIe set for CCW ( 1 tap+ 1 die) is about 300$ with a 1 month lead time. For CW thread it's about half that price. Only one compagnie has them listed in their chatalog, but most toolmaker will cut custom taps for you but as with all cuistom stuff it's going to be a killer...Better off making then on the lathe if you only plan on making a few. as for drill size: 14mm x 2.0 ---> 12.0 mm 14mm x 1.5 --->12.5 mm 14mm x 1.0 ---> 12.5 mm __________________ Vondnik, team Bad Karma, PQAC Murphy's second rule: Nothing is impossible for the man who does not have to do it himself.

January 19th, 2006, 18:55	#7
CDN_Stalker Official ASC Bladesmith Trader rating Join Date: Jul 2003 Location: Ottawa, Ont.	Good info to have. Bawbag said he has a 14mm CCW (or CW, can't recall) tap that he bought, and chances are high that he didn't pay a lot for it, he's not even 20 yet!! Wonder where he got it from. Still, this is turning out to be a somewhat useful thread. __________________ STKR Knives http://www.facebook.com/#!/pages/STK...17036668380871

What size drill bit for a 14mm tap?

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