Measuring Thread Pitch & Threads Per Inch | Fasteners 101
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- Опубликовано: 10 сен 2024
- Confused about the threading of your bolts? How about the naming conventions surrounding bolts and screws? Let us help clear it all up! In this video we explain Threads per Inch (TPI), Thread Pitch, and how both are measured and notated in fastener sizes.
In short, Thread Count, also known as TPI (Threads Per Inch), is a form of measurement exclusive to American bolts, screws, and fasteners. Thread Count is as simple as it sounds: the number of threads per inch measured along the length of the fastener.
Thread Pitch, on the other hand, is for Metric fasteners and defines the distance between threads expressed in millimeters along the length of the fastener.
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![How to Identify Thread Pitch and Size | Tech Tips | Swagelok [2020]](http://i.ytimg.com/vi/Gdvtw0pTAOs/mqdefault.jpg)
The example Bolt drawings shown in this video are not to scale. 20 Threads per inch is a common measurement we used to demonstrate the format of bolt sizes and the 5 threads per inch on the bolt image just happens to be what our artist was able to draw within the provided space. We apologize for the confusion.
omg....I thought the USA had changed the rules....I was so confused becuz you kept pointing and looking at the drawn diagram , sometimes my mind flips...thanks for this explanation...
Great instructional video, well presented and very professional, Thank You!
You're very welcome! Thank you for the feedback!
Where tf did you get 20 from if it 5 threads per inch?
We apologize for that. It was just an example image that is not to scale. 20 Threads per inch is a common measurement we used to demonstrate the format of bolt sizes and the 5 threads per inch on the bolt image just happens to be what our artist was able to draw within the provided space.
yeah, it is super confusing he says that and shows us a pic is different from what he said. I agree with you.
Thank you very much for the teaching.
THANK YOU! That clarified what needed to be clarified.
Glad we could clear some stuff up! Thank you for your feedback.
thank you i needed this for my ied class
Happy to help!
@@AlbanyCountyFasteners
i am still not clear on how to id a thread. can you do a clear video on thread, how many type of thread on earth ? how many standard on earth ? all those thread for water and gas (parallel thread, tapered thread) and normal screw fasterner thread. what are the factor must have to determinate a thread on something in each system ?
how many type of thread gauge available to use and purchase ? and how to use thread gauge to determine ?
i am so confused. not even one complete video out there can clear my doubt.. oh.. help.
andrew
@@andrewyek As far as fasteners go, there are only 2 thread systems that matter: The Unified thread system (US or Imperial Threading) and The ISO Metric screw thread system. Other thread systems and standards are either atypical, aren't used for fasteners, or are obsolete and kept around as legacy systems for dealing with older machinery.
For finding the threading of a given fastener or what have you, there are many gauges available. Gauges for Imperial (US) and Metric systems can be found on our site here: www.albanycountyfasteners.com/Fastener-Gauges-s/993.htm
Outside of the gauges, the Fastener Black Book may also be something for you to look into. It goes into greater depth about measuring and identifying fastener threads: amzn.to/2LvkHEY
Your other questions may be answered in a future video, as we believe the water and gas thread relate more to plumbing than fasteners. Thank you for your feedback!
This is exactly what I needed to know. Thank you for the wonderful video!
When you measure thread pitch, do you measure the smallest distance between peaks, or do you measure the distance between peaks, measuring parallel to the axis of the bolt? They result in different outputs, so I'd like to know which measurement to take before making plans
I know the whole world has gone metric, but threads per inch is so much simpler and easier to figure out than thread pitch. Basically because I can still identify a bolt size even if I don’t have a ruler with me.
Very true. Thank you for your feedback!
yeah but its way easier in metric to make one on a lathe
As a eu metric guy I do have to agree
very clear explanation. Great job.
Glad it was helpful!
Very good
what seems to never be mentioned, but can be confusing is HOW to measure threads per inch.... the metric pitch measurement is easy, as its measured at the peaks of 2 consecutive threads.... but the threads per inch can be mistakenly measured at the peaks when it needs to be correctly measured from a valley, and the other end of the 1" measuring device will either fall in a valley, with the teeth counted in between, OR, it will end on a peak, or somewhere in between the valley and the peak, which would designate either a half thread or 1/4 thread, which are rare but are sometimes found.... to make it simple for explanation purposes, take a very large SAE bolt that has the threads measured from peak to peak may seem to have 4 threads per inch, but when properly measured at the valley, it will be found to be a 3.5tpi bolt... this needs to be understood to get the proper measurement, and it can probably expained in a much better way than Ive tried to do here....
Thank you for your feedback!
Thanks that helped me, i have an exam tomorrow. 👍
You're welcome! Glad we could help.
Awesome info, thanks!
When you mentioned "diameter", one assumes the shank and not the teeth, right?
Excellent
thank you
Very nice information u given me
You're welcome! Thank you for your feedback.
Song in the beginning?
Wow. Thank you so much!
You're welcome! Thank you for your feedback.
When you are counting the threads, does it matter whether you start counting from the trough or peak of the threads? Here it looks like you're starting from the trough but I just wanted to double check
When measuring Imperial fasteners you count the number of thread peaks per inch. For metric fasteners it's the distance between the peaks that's measured. We apologize for the confusion.
It was a very good video, but can you just explain me what is coarse pitch thread and fine pitch thread??
Coarse and Fine are two different types of screw threading. Coarse threading has less threads per inch (or thread pitch) than fine threading. As an example, 1/4"-20 is coarse thread with 20 threads per inch while 1/4"-28 is the fine thread version with 28 threads per inch.
The added threads make Fine thread screws have a stronger connection with more vibration resistance. Coarse thread screws are more resistant to stripping and cross threading while being easier to install since they don't require as many turns to screw in as fine threaded screws do.
We're planning on doing a future video on the subject, so we thank you for your interest.
you should leave in the comments that the 20 is not the actual number for drawing and that it should be 5 in equation
I was thinking how does he get 20 from 5 , do we multiply x4 or something ? But no . It's just not a good diagram
Thank you for your feedback.
What means 12g 1/2" 9/16" on thread gauge?
thanks
Thank you for your feedback!
Brilliant, I have STEM 1/2" x 27 35/64"
Thank you for your feedback!
M2x.4x5M is 5 metres long init ?
Millimeters
I wish you would do a video on non standard threads. For example: a tube of toothpaste, a fruit jar, or a jack screw. What is the thread on a toothpaste tube? Also what are the different shapes of threads, V shape, round, square, etc. ? Why is one shape preferred over another? Thank you
Non-standard threads are outside the scope of what we intended for this video. We'll consider this for a future video! Thank you for your feedback.
Great explanation, bit confused about 5m , is 5m not 5 metres, surely it should say 5mm for 5 millimtres
Under normal circumstances, you'd be right! In the context of fasteners, 5m is shorthand for millimeters. Outside of threaded rod, the vast bulk of metric fasteners don't go beyond millimeter measurements. I guess they got tired of having to write a second m all the time!
@@AlbanyCountyFasteners @ every day is a schoolday mate, thanks for that
Nice explanation bro
Thank you for your feedback!
Amazing. Thank you
You're welcome! Thank you for your feedback.
great !!!!
@Albany County Fasteners Great video, why do bolts (fasteners) not seem to have the head size / style specified?
Head size is typically less important than the thread size (you have to make sure your fastener will fit in the hole first after all!) and is not usually displayed like the diameter and pitch. Head size can be found in the specifications table for a given bolt, however; for hex head bolts it's synonymous with wrench size. As far as style goes, if you are referring to bolt grades, our other video on the subject may be able to help you: ruclips.net/video/GMtw6d_o_2M/видео.html
🎉🎉 thanks you
What about imperial? ta
Im from EU and i gotta admit that US system of thread pitching is far less complicated and better
👍👍
Thank you for your feedback!
Seriously? All you had to do was add in what M2 means and it would have been a complete video.
Fasten-ating.