What Size Hole to Drill for 1/2 Inch Tap

Been trying unlike drill sizes and cant seem to discover the right ane for 1/two"-28 tap. Thanks

Tried that i but doesnt give me full thread appointment. Seems like its too big. Tried 7/sixteen also and that seems likewise small. Peradventure need to effort dissimilar drill bit. Any other sizes that works

Post by **featherblue** » Tue November xviii, 2008 10:47 pm

http://reference.kennametal.com/Calcula ... lSize.aspx

Above link includes bore size estimator for whatsoever threaded fastener. Class of fit etc.

Hint: Do not exceed fourscore% thread in non precision thread generation. A improve fit for your gun barrel awarding would be 70%.

Post by **camoxjeep** » Tue November xviii, 2008 xi:02 pm

featherblue wrote:http://reference.kennametal.com/Calcula ... lSize.aspx

Above link includes bore size reckoner for whatsoever threaded fastener. Grade of fit etc.

Hint: Exercise not exceed 80% thread in non precision thread generation. A improve fit for your gun barrel application would be 70%.

Thank you, so the major dia would be .500 TPI=28 thread peak 70% gives me 29/64? Am I doing this correct? thanks

Post by **Loves2Shoot** » Tue November xviii, 2008 11:02 pm

Well, that is what we've used for years with no problems.

Loves2Shoot wrote:Well, that is what we've used for years with no problems.

Ok thanks, might be my drill bit cut likewise much material.

Mail by **win912** » Tue Nov 18, 2008 11:10 pm

Always drill a pilot hole slightly undersize first...step drill information technology upwards to the tap dril size. Surf internet for "Tap Drill Chart"...that should help.

Post past **David Hineline** » Midweek Nov nineteen, 2008 1:03 am

I always apply fifteen/32 and take never noticed a trouble.

Post by **featherblue** » Thu Nov twenty, 2008 12:07 am

Handy formula:

To calculate the tap drill size by hand, use this formula:

TD = Doctor - (i/Due north)

where TD is the tap drill size, Doctor is the major diameter of the tap (e.k., 3/8 inch for a 3/8"-16 tap), and N is the number of threads per inch (16 in the case of a iii/eight"-sixteen tap). For a iii/eight"-16 tap, the in a higher place formula would produce v/sixteen as a outcome, which is the correct tap drill diameter for a 3/8"-16 tap. The result produces a tap drill size that results in an approximate 75 per centum thread.

Mail by **John A.** » Fri Nov 28, 2008 4:03 pm

I used 29/64. Didn't accept a problem. Fits 3 different guns.

Post by **camoxjeep** » Fri November 28, 2008 seven:29 pm

I used 29/64 on a stainless cage brake I'thousand making and it worked great. For some reason information technology didnt do proficient on aluminum.

Mail service past **bakerjw** » Fri Nov 28, 2008 vii:42 pm

Is this for a can to adhere to a standard AR15 thread?

I only enquire equally I've always been under the agreement that information technology is best to employ a lathe to cut the threads rather than use a tap. I could be wrong though.

Post by **GeneT** » Sat Nov 29, 2008 1:10 pm

bakerjw wrote:Is this for a tin can to attach to a standard AR15 thread?

I only ask as I've ever been under the understanding that it is best to use a lathe to cutting the threads rather than use a tap. I could be wrong though.

At that place's really nil wrong with tap cut, it'southward simply that the mode to tap a straight pigsty is to utilise a lathe... Usually people are resorting to taps because they don't have a lathe, so the holes come out egged, diagonal, or otherwise imperfect.

GsT

Post by **John A.** » Sat Nov 29, 2008 2:21 pm

My thread work was done on a mill.

The threads are neat and tight. The rough spot y'all see in the pic of the threading is merely a slice of fuzz or something from where I used a rag to apply the cold bluish paste.

I wasn't happy with the cold blue, so I concluded up case hardening it earlier tigging it and then applied moly over everything after it was welded to the tube.

I guess what I'thousand trying to say is there's more i way to practice it.

Post by **sfasbv269** » Sat Nov 29, 2008 seven:31 pm

You can use the tailstock on a lathe to line upwards the tap. I always get the ones with the countersunk hole so you can use a expressionless centre for alignment. It works well with a manufacturing plant or would even help on a drillpress if you lot utilise one.

Post by **Loves2Shoot** » Sunday Nov 30, 2008 ii:27 am

Kennametal says that 0.468 (fifteen/32) is 69% in a 1/ii 10 28 and
.4652 (29/64) is 75%, merely I gauge they could be wrong.

I just know it works if you do it right. I don't think well-nigh folk tin can fifty-fifty notice v-vi% and you lot tin can get that if you don't have good setup anyhow.

What Size Hole to Drill for 1/2 Inch Tap

What size drill bit for one/2-28 tap?

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