Power Tools & Carpentry Skills : How to Use a Tap & Die Set

By Grover Koelpin 20 comments

Tap and dies for making threaded holes and
threaded rods. I’m Robert Markey. I’ve been doing construction for many years and we’re
going to talk about the use of tap and die. Basically a tap is threaded thing, tool, which
will take a hole that we drill and turn it into a threaded hole so you can put a bolt
in it. The die is the opposite. It takes a rod and creates a thread so it turns it into
a bolt. Make sure that when you go through this hole here you want to make sure that
your hole drilled is appropriate to the size at which usually a tap and die set will give
you the drill sizes for any of the taps and put a little bit of oil on it and let’s do
one here and take the handle and we turn it. Keep it pretty straight and there you have
it. You can also use this if you have a nut that has got bad threads that got damaged.
You can use this to refurbish them. With the die you make a bolt out of this fat nail here
and you put some oil on it and you start the die and again the trick is to keep it as straight
as you can and we have now turned our nail to a bolt. I don’t know if we used the same
size but there we have it. I’m Robert Markey and we’ve been talking about tap and die.



Dec 12, 2008, 12:58 pm Reply

Do the taps only work in wood, or can they be used with other materials, too?


Jun 6, 2009, 5:18 pm Reply

whats the maximum realistic hole diameter can i thread? in terms of aluminium


Jun 6, 2009, 5:36 am Reply

Can I change a bolt from a metric thread to a standard thread?

neil tonks

Sep 9, 2009, 5:27 am Reply

heres a handy tip, for the hole size the general rule is, thread size minus the pitch equals the size of the hole you need. eg an 18mm thread with a 1.5mm pitch = a 16.5mm hole, as for the outside thread i usally make the bar 0.2-0.3mm less than the thread. eg for an 18mm thread i'd turn the bar to 17,8mm,


Oct 10, 2009, 7:42 pm Reply

I'm new to using these and trying to do a little metal work, as the net is confusing me not helping me. all articals and video's tend to talk about taps mostly and not about how to match the right die to the correct tap Here's my question.
I have a nut that fits a 1/8BSP28 tap perfectly, what diameter should the bolt be (unthreaded) and Also what die would i then use? the 1/8BSP28 die??


Nov 11, 2009, 10:23 pm Reply

Good stuff – Thankyou.
Is the oil a specific type – Would 3 in 1 type oil do the trick?


Dec 12, 2009, 6:35 am Reply

@MrBoggles yes. 1/8 is the mean diameter of the fastener. 28 is threads per inch. BSP is british standard pipe. basically a metric pipe tap… use a thread guage to determine the thread pitch of your bolt. you would then use the correct die or tap with the same numbers on them. 6 x 1.00mm bolt uses a 6 x 1.0mm tap to fix the hole and 6 x 1.0mm die to fix the fastener {bolt} us and british standard use threads per inch TPI. your bolt if an inch long would have 28 threads on it.

lyn reyes

May 5, 2010, 4:44 am Reply

nice and simply done good explanation as well

Tyler McArthur

Sep 9, 2010, 12:10 am Reply

Terrible video. Once again, can't actually watch the video because the subtitles take up the entire freaking screen.

sighasaurus rex

Oct 10, 2010, 10:51 pm Reply

I sell alot of taper second and plug hand taps, what size of tap were you using?

Salman Sheikh

Mar 3, 2011, 12:07 pm Reply

Awesome video but its needs to be redone because you got to finish with the rod fitting the hole..


Mar 3, 2011, 8:22 pm Reply

Thanks for the vid it's extremely informative – just what I needed.


May 5, 2011, 3:50 am Reply

isn't that the guy from cheech and chong?


Jul 7, 2011, 4:59 pm Reply



Nov 11, 2011, 4:51 pm Reply

@julzrafpilot Okay there buddy


Apr 4, 2012, 12:27 am Reply

finally one good expervillage video

GottaShopIt com

Mar 3, 2013, 8:28 am Reply

Great vid..you are a real pro..I appreciate your efforts buy you could have said a few words about TPI in this regard.

purple guy.

Mar 3, 2013, 10:37 pm Reply

if I have say a 10 mm bolt hole tnats messed up, do I use a 10 mm tap to sort it or do I have to use different size, this would be for a 10 mm bolt,hope this makes sense

Boggie man

Feb 2, 2015, 5:02 am Reply

Hello, I have a pony 3/4 clamps, I'm planning to use a black iron pipe to go along the Pony clamps, can I use similar die to thread the pipe?

Matthew Lavergne

Feb 2, 2017, 9:57 am Reply

I bought instruction from WoodPrix and I build it very very cheap.

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