METRIC vs. INCH-based (UTS) threads

Metric and inch-based threads are NEVER interchangeable. How are these two screw theads different? What`s TPI mean? What options are there to sort the 2 kinds of hardware out if mixed up? What do the numbers mean in thread specifications like M10x1.5 or UTS 3/8"-16NC? Watch and learn.
To count turns per whole inch or any whole number of mm`s you can line up your ruler to start at a root as well. Just make sure you count actual turns as a nut would travel.
Memorize terminology and reach proficiency with pitch calculations.

[@devurandom2019]

Thanks for this explanation and great clarification. So many web sites push out UTS to metric equivalent conversions, but they don't work.

[@logangarrett8333]

I learn more on KZbin than I ever did at school.

[@apprenticemath]

Thanks for watching, same here.

[@PrashantKumar-or8bf]

me too

[@TheZvonce64]

Me too, college ...

[@icespeckledhens]

A very clear mathematical explanation of the differences between threads Thanks

[@gordonclark7632]

Very informative. I could actually follow the explanation. If you are doing that maths in your head for the UTS and MM, you are amazing.

[@mxcollin95]

Great job explaining the basics and making everything very understandable!

[@johnfry9010]

Great video , it really explains the exact difference , very easy to understand now !

[@mkdnreed01]

Thanks for making this video. These were very clear explanations about bolt sizing.

[@bryanpeart]

finally i understand what I was doing wrong!!!!!!!!!!!! It wasn't the wrong size, it was the wrong system!!!!! THANK YOU!!!!!!!!!!!!! 3rd trip to home depot will be my last for this project!

[@houlmouth]

Thanks a million you gave very clear and complete explanations. More than my teacher ever did. I don't know if you teach (other than KZbin), but you should definitely do so.

[@apprenticemath]

Cosmic Jinx You`re welcome. Yes I shot it in class, I combine math with skilled trades applications.

[@davebarry1232]

Thank you for a very comprehensive and informative video! I write to inquire about methods to measure actual thread angle of a bolt in order to determine if it is UTS or BSW (British Standard Whitworth). I have a bolt with a major diameter of 1" and 8 threads per inch. Unfortunately, a standard 60 degree 1" x 8 nut doesn't work suggesting it may be a 55 degree thread angle that is standard on the Whitworth bolts. This bolt is on a boat that was built in Hong Kong where British hardware is used. I prefer to determine the actual thread angle of the part on the boat to avoid removing the part and interested in your thoughts. Thanks again! Dave

[@ArtistMrNitish]

THANKS FOR THIS VALUABLE INFORMATION. LEARNT A LOT.

[@CR3DT]

Thank you for sharing this, I wish they would also teach this in school

[@kurtlittlewood4279]

Thank you! you are great! that was slear, concise and very useful. best explanation I have had. useful tips at end thanks again.

[@mxcollin95]

Great video! Thanks for posting.

[@aw_overland]

Now I can get the perfect pitch for my 3d printed nuts/bolts.

[@scottskindingsrude8093]

Excellent video. Great Job!

[@Relax-ls1xi]

Hi this is very good video. But i cant match with eyes metric or whitworth. How can i identify with look to fitting screw metric or bsp or unf or orfs?

[@jimmykelley883]

Great video! Very helpful!!

[@RMDYMOTIVATIONAL]

Did you just write with your both hand ? Amazing teaching skills

[@apprenticemath]

Correct, slipped out, it happens ...

[@arunbebade]

This is nice information. Thanks for sharing it on youttube

[@raysham9605]

Very useful information

[@MultiChaga]

Looks like UTS imperial is easier because all threading is definate whereas metric has to be calculated when we dont know the pitch. Many thanks anyway for so precious infos.

[@apprenticemath]

Thanks for watching!

[@claireraybould3936]

really useful stuff

[@raysham9605]

What is the name of the distance between the tips of the crest to the root, it is an important measurement?

[@apprenticemath]

either flank, slant height of a triangle, or hypotenuse - all depending on context

[@arunks123]

that counts 9 threads per half inch = 18 threads per inch, but turn wise it is 16 turns per inch. which one is correct ?

[@apprenticemath]

18 18 threads will take 18 turns as well.

[@danl.4743]

Holy cow. I am a metric guy in the US, and this gave me a dizzy head. Good video. I wonder, which is the more common standard in metric: At M8, the pitch start to go fine/course. M8x1.0, M8x1.25 M10x1.5, M10x1.25 Which is the more common one? the fine, or the course? Thanks.

[@apprenticemath]

Most people come across the coarse more often, which is used where repeated assembly is required or there is dirt, fine is used for higher strength, fine adjustments and more permanent connection.

[@horste9237]

M8x1,0 is fine thread and less common. M8x1,25 is regular pitch and very common in screws. In this case the pitch normally is not mentioned, we write only "M8". M10x1,5 = M10

[@wallyvanveen1211]

mmmm As impressed as everyone else below. What still puzzles me however, is identifying 'the different' (What I understand to be) imperial threads. How Do I identify if a thread is (for example) W SAE UCF UNC Or any other thread which is no metric? Thanking anybody in anticipation.

[@karthickkrish2905]

how to calculate the drill dia in 1/8 .28 bsp

[@vbhargav7280]

For a b.s.p standard you must add another 1/4 in addition to the specified size and then multiply with your 25.** to get a perfect drill size 1/8th= (1/8+1/4)*25.4= 9.525mm drill size might be for a enlarged hole it takes 9.8mm and to make a b.s.p thread refer the standard thread chart for 1/8 your drill bit size is 8.8mm

[@massmanute]

What about a special case of substituting a metric 1.8x35 for a SAE 1-72 screw? the dimensions are quite close. For example, the 1-72 has a pitch of .353 mm whereas the 1.8x35 has a pitch of .35 mm. The two are within 1% of each other. The diameter is also quite close, i.e. 1.8mm vs. 1.85mm. considering manufacturing tolerances, perhaps they might interchange in some applications(?).

[@apprenticemath]

massmanute Reasonable, but no. 1 Standard manufacturing tolerances are in the 4th and 5th decimal places. Close enough is nowhere near close enough. 2 A theoretical 5 turns on loosely fitting threads will make an initial difference of 0.003 into a 0.015 The threads will jam, but only one thread will hold all the load on the connection. Which won`t last. The threads are incompatible.

[@massmanute]

apprenticemath Thanks for the reply.

[@wasanthakulasekara9865]

great,thanks sir.

[@Jerkwaad]

Very good.

[@kaag75]

thank you.....

[@raysham9605]

How about the thread depth?

[@apprenticemath]

In this video kzbin.info/www/bejne/eF7dhoZodr93h80

[@benziexavier]

Thankyou Sir

[@TheSavageJCE]

Public comment added to the comment section of this video.

[@Trident_Euclid]

So the 3/8 is the major diameter?

[@apprenticemath]

3/8 is nominal, crest truncations take away from it

[@tychangty0212]

I wish school can be like this

[@manitoy269]

what about unf threads teacher? very good video

[@apprenticemath]

Same geometry, same terms, different pitches. There`s also metric fine, metric coarse.

[@malcolmmarzo2461]

Thanks. Always thought TPI meant "per inch." Like millions of others in English-speaking world : -)

[@apprenticemath]

It still means that. In English or other languages. Just like " /h" is per hour everywhere.

[@figjams]

Wow, you should have went to Brushville Supply. First trip will get you the right size! Just ask the experts.

[@apprenticemath]

+bob figley I have the right one, but which is it, ... was it this one ... or did I put it there ...

[@HAINGUYEN-id8gs]

how to calculate depth in screw thread?

[@apprenticemath]

This is how: kzbin.info?o=U&video_id=B-zUS2AZDQk

[@HAINGUYEN-id8gs]

Not link ?? :(

[@apprenticemath]

thread depth = cos 30 x pitch x 5/8

[@HAINGUYEN-id8gs]

Thank you. If I cut multiple thread metric (ISO) M20 x 2 x 2 or M20 x 2 x 3 How to calculate depth in multiple thread?

[@HAINGUYEN-id8gs]

How to calculate diameter hole to cut inner thread?

[@geewizz3335]

thanks awesome