The Nuts and Bolts of Screws: Bolt ID for Machinists, Mechanics, and Engineers - Haas Tip of the Day
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- čas přidán 19. 01. 2022
- Often you might find yourself asking "What bolt am I holding?" or "Is this an Inch or Metric screw?". In this Tip of the Day, Mark takes a thorough look at the many important aspects of screw identification that can help you figure out exactly what fastener you're dealing with.
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After watching this video, I am once again glad that there is a metric measurement system in my country 😅 Good job Mark, and Haas Team
yet all engineers leave it to work in the country thats not using it ....weird eh?
@@Adrian-mq5ld inches are for carpenters and Whores
metric scale is for Communists
get yourself into American engineering
You may be glad now, but wait till they change to metric time. Instead of a clock going to 12, it will be 10. 10 months in a year etc.
@@kirbylee57 France tried that and couldn't make it stick. However using Cents for time and converting makes calculating easier.
I live in a metric country but work on Boeing stuff so unfortunately I still need all metric and imperial tools
Metric bolt: 8 means 800MPa
Inch bolt: 3 means 5, this five means... it's complicated
Yeah how on earth is the imperial system still around, none of the imperial stuff seems obvious
@@TheFool2cool Answer: Tool suppliers like Snap-on and such have a saying. "2 sets of tools in every box".
The biggest scam ever foisted on mechanics and technicians.
Haha try A/N stuff 🤣
Dash 8 is 1/2" dash 4 is 1/4" (tubing)
Kinda makes sense and is totally goofy all at the same time 🙂
@@MrTheHillfolk For tube sizes that's just measured in 1/16ths. 8/16 = 1/2" 4/16 = 1/4". A bit goofy because that's nominal tube size and not the actual inner diameter but the idea is to make it simple to figure out what fitting to use for a given hose or vice-versa. It shifts the annoyances of figuring out what the actual thread parameters are to the manufacturer and for the guy who just needs to replace a broken AN fitting on a 1/2" hose he can easily take that and convert to 16ths to get the right size without needing to know that that corresponds to a 3/4-16 thread for that fitting. There's not much of a point to mixing anything non-AN with an AN fitting and the vast majority of users are not machinists so just knowing the tube size is fine for most people.
Imperial System is complicated
3:50 STOP THIS MAN
He's too powerful!!!!
I made the Silicone bolt (and the clear resin bolt), casting them from the 5/8-11 bolt that I had. Learned how on youtube! czcams.com/video/PGytZQIVcuA/video.html
40 years ago, I worked in an engineering-supply house for 7 years... I got to where I could tell by just looking at a bolt OR a nut exactly what thread it was UNF / UNC / METRIC / Whitworth etc) .. and I knew off by heart the tapping drill sizes too !
We also sold those Zeus Flip books (on the bench at the start) which were a mine of information & plastic coated pages for longevity...
I had a priest come in once looking for a nut to fit something up at the church, I can't remember now, but he had brought in a bar of soap with an impression of the bolt thread !! 😁
He was obviously a McGyver fan.. 😏
Of course, I was able to match it easily enough & I gave him one on the house, telling him to go easy on me next time I was in confession... 🙄😇
From the Emerald Isle
😎👍☘️🍺
I work at an autopart and honestly, I might use that soap bar trick😅
I can remember being in school in the 80s when the metric system was introduced to the US and it was poorly received. Mostly because it was an upset to our already established (and learned) system and a bit because of our fierce sense of pride and individuality as Americans. After living abroad as a service member I have come to appreciate the simplicity and ease of use of the metric system. Transition can be a slow process but the outcome can be well worth it.
I agree here in the UK the imperial system was our method for generations when you see an old engineering drawing from the seventies next to a modern metric engineering drawing it's some much clearer just easier to work with but your Wright the old timers still like imperial depends on your age I guess .I learned the two systems as sometimes o have to read old engineering drawings.
Ehh might as well use both, doubles the size of the part catalog.
@@thegoat949 I'm 62 years old now. I have been dealing with this crap since 1978 here in America. It will never change in my lifetime. There is too much money to be made by tool and hardware suppliers.
"2 sets of tools in every box"
I've worked on vws since I started driving about 30yrs ago ,so I've adapted and it's handy.
Then you can also figure out what wrench sizes interchange in a pinch and all kinds of other good stuff.
@@MrTheHillfolk Yep, my 14mm works on my 9/16" bolts. There are a few like that!
Wow, the amount of effort that goes into each of these videos is mind-boggling. From the planning to the animations and even the props these videos are fantastic. In the space of but 15 minutes, you have managed to cover the basics and some more specific details of bolts, screws and fasteners in general. Keep up the good work!!
Mark teaching sophomore level courses for the Mechanical Engineering programs at universities in one video free of charge! You took me back to my college days. Put up a stress strain curves, Mohr's Circle and stress/strain equations, and bam, you are an engineer! Great video Mark!
Almost put up the stress strain curve 😀, but it started to feel off topic, from screw identification. On the table at the beginning (middle back) 00:40 were three screws of different grades where I’d taken the screws and torqued them to failure (tensile) and torqued them past yield. It’s not a good feeling when righty-tighty turns into righty-loosy! I use a 2 needle (memory needle) torque wrench while testing ultimate strength so it’s really easy to see what’s happening, when you keep turning but the torque stops increasing. We should make a short video that just shows that footage. Thanks for the comment.
Wait, they actually teach engineers about hardware?!.
Color me shocked - we once had a summer intern working on his Master's in Mech E, and he didn't know what a Phillips screw was - came looking for a a "cross screwdriver". Nobody knew what the hell he was talking about.
He lasted 2 weeks.
@@machinist7230 Well I guess it all depends on the university. I'm a Calpoly graduate and hardware was part of the lectures and labs. Understanding fasteners, how they work, what they are and how to design for a given application was critical though machine design and strength of materials. Looks like your intern went to a "lecture" base university. Beware of those engineers lol.
I can't belive I watched this for free. Thank you so much. I love you guys keep going. I'm learning so much.
if this video was 1 hour long, I'd still watch it with the same attention, thanks guys, really appreciated.
I am a technician repairing machines and mostly almost using the metric system all the time. I didn't know almost half of these details.
thanks for sharing these useful details.
This is a topic that always seemed overly complicated. Thanks to the great information in this video I now understand that yes, it is indeed overly complicated!
it is complicated asf if you look at the bolts /screws used on cars...you know those that have the washers fixed on them. I'm restoring cars to the nuts and bolts so to say and trust me its hard asf to find original bolts or fix holes to make them work with the original bolts ...then you get to the washer size or heck even bolt factory color ....it gets complicated fast.
P.S. lately the assholes are using plastic rivets ...again those come in different size diameters ...and most of this crap goes around the wheel arch exactly where people tend to loose or don't care about originality .Things like these trigger my ocd lol
@@Adrian-mq5ld oh I fuckin hate those Jesus pins
@@3dpyromaniac560 yea if you are like me and want your fix to look like it left the factory I understand your feeling. Man I have a 88 Firebird and they used 10mm bolts that hold the plastic cover inside the wheel arch.... move to any 90's + cars and you will have plastic rivets that you have to break to remove the plastic....screw this shit ,no pun intended.
Very informative. What is even more amazing is how complex oil field pipe threading is to ensure gas tight seals that allows the pipe to be twisted, bent and steered for thousands of feet while maintaining those seals.
Oh yeah, those oil field API threads have a lot going on. My buddy Darren Peltier works in the Houston area (doing the same thing I do pretty much), and its always fun to listen to him talk about all the crazy threads you'll find out there. We (Haas) have special cycles (partly developed by Darren) to re-cut and repair a lot of those oil-field threads on our Haas lathes. Fun stuff.
Only problem I have with this video, which is very useful by the way and I thank you for it, is Flight 5390 resulted in the Captain (known in the industry as pilot in command) being partially removed from the aircraft while the First Officer/Co-pilot was the one who landed the plane, thereby saving the Captain's life.
Yes remember that very well , in aviation fitting i was told you check-check-check & every part is logged a shortcut made somewhere i would think ..................
Evan is spot on! I came here because I like knowing what I think I already know! I am disappointed that this man ( narrator) did not do his research prior making this video. The Captain was who was sucked out not the First Officer. He is the FO is the one that landed the airplane. The mechanic was not any smarter. He should have known that he was using the incorrect fasteners just from how they were going into the window frame!
@@TheFalconJetDriver You should get your money back.
Not only the wrong screws used, but originally the window had been installed with the wrong ones, but since the mastic used to pressure seal it was fully cured the screws being wrong were not too much of an issue. But the new window, with still curing sealer, and the wrong screws, plus replacement screws used that were visually compared on replacing with like for like. Instead of looking up the IPC, and getting the part with the correct part number, correct diameter, thread and length, was the bigger problem. Thus the screws were the only thing holding the window in, and they simply were not up to the task with the tiny area of engaged thread.
The windshield pane would be better fitted from the inside
@@norton750cc Has to be fitted on the outside, impossible to fit on the inside, as it goes below the instrument panel, which to remove takes at least 2 months work.
@@SeanBZA I get that, I worked in the subsea industry, a view port in a submersible has to be a taper fit from the outside as that is the hi press side. Also as you say it is not viable to strip out the panel.
The pressure is also a factor, aircraft at hi altitude internal pressure is only a few psi above ambient, subs can be hundreds of times that . Thanks for saying.
@@norton750cc Yes in general aircraft window are held in by a pretty strong 2 part adhesive, like car windscreens are. The screws are there mainly for assembly and as back up in case the flexible joint fails, but in no way are they strong enough to hold the pressure, the window failed because the screws were the wrong type, too short and too thin, so not enough thread engaged, so they sheered out with time, but also the adhesive was not fully cured, which takes a week or more to do, but it is in general cured enough to hold the window in, with the screws in correctly, after only a few hours.
@@SeanBZA Roger that Sir
Worked at a fastener manufacturer years ago. Particularly for automotive fasteners, the other letters and symbols are manufacturer marks. Sometimes simply company initials, sometimes company logos, sometimes just a symbol. Often times symbols would identify the plant the fastener was produced at.
Love these tip of the day videos. So much useful information and they are really well made.
On early machinery manufacturers used their own threadforms, a nightmare... until Whitworth came along.
A friend was having a hard time finding nuts for the j-hooks on his old banjo, so we measured them. 8-26. Completely non-standard but it was what all these antique banjos used. Back in the day luthiers made their own nuts and bolts and someone got creative. Thread standards changed everything.
If you machine metric thread like tapping hole with hand tap , diameter of the hole = major diameter - pitch ( M6x1 need 5mm hole,....). But in some case with special requirement, you must check carefully in machinist book to find tolerance.
Gotta love when something makes sense
Our inch bolts are similar, we just have to do some math first to calculate our pitch. For a 1/4-20 tap our tap drill would be our diameter (1/4=.250”) minus our pitch. Our pitch would be 1/our TPI threads per inch, which is 20 TPI in this case (1/20=.05” pitch). .250-.05=.200”, which matches well with our typical .201” diameter tap drill for a 1/4-20. Your rule of thumb is much easier with metric fasteners where a tap drill nor an M10x1 is just 10mm-1mm which is 9mm.
This was the best video I’ve seen all year. The amount of content and useful information that you gave is greatly appreciated.
Funny, I just saw that episode of Air Disasters about a week ago. Can't believe the pilot actually survived the extreme cold and conditions all the way to landing.
I had seen a couple of those disasters, a couple days ago, but I skipped that one (blown out) when it was recommended to me. I saw the cargo door latch failure & the disgruntled fedex engineer that tried to take over a flight by hitting the crew in the head w/hammer. Now I've got to go watch it, 5390
Excellent video Haas and Mark! We appreciate your efforts
12:47>>> Answer: Use of metric standard. ;)
As far as flight 5390 goes a bolt checker would not have helped. The window had been installed with the smaller bolts originally. When the mechanic replaced the window he matched the bolts he took out with new ones and replaced the window instead of following his checklists and referring to the aircrafts books to look up the correct size. This lead to much tighter restrictions on aircraft maintenance and now mechanics do not have access to bolts. They have to go to a desk with all the information of the aircraft they are working on and give it to a guy or gal working the desk who looks up the correct bolt and then gets it for them, kinda like a pharmacy.
Great effort Mark, really appreciate. Your videos help us (Machining Istructors) a lot. The quality of the content is commendable.
this was one of the best technical videos about screws in youtube !!!!
Oh, this info is great. Please keep posting. This is quality teaching by a quality company.
I just passed this information on to my grandson who is aspiring mechanic wish I would have learned this 60 years ago
Good summation of bolts and threads.
Funny enough, even though Australia went 'Metric' in the '70's, there is a need for metric, imperial (inch) and even Witworth tools, taps and wrenches.
Life, don't talk to me about (tool) life!
I recently took a class on Fundamentals of Properties of Materials the past semester at University, and this video basically was a recap for me. Also, I remember my days at a machine shop back in the day at High Shcool. Awesome content like always, keep up.
It was my professor, in that class, that told me if I wanted to be an engineer I should quit my current job and go work someplace where they have machines, and engineering going on. I did. I found a job at a place that had CNC Machines and I was blown away. I ended up programming at that shop, and becoming Operations Manager there. Loved it. Ended up turning in all my units for a business degree, but I have to thank that Engineering Professor for setting me on the path that was right for me.
@@markterryberry4477 Wow, I am glad, amazed, and honored by hearing that! I hope you stay there forever, just because you find your passion, you always need to pursue your dreams. Currently, I'm in my second year of University, and I found it to be amazing. My Mechanical Engineer obsession is about Designing and Manufacturing, those are my two favorite things about it. I fell in love with SolidWorks, welding, and machine shop equipment like lathes, millings, CNC Machines, and more. Continue that awesome path of manufacturing, it is an amazing job that everyone benefits from. Keep it up!
I learnt more in 15 minutes here than a year in college.
Thanks Mark, this was both educational and informative, and also very interesting. The great thing about standards is that there are so many different ones!
This video is very helpful actually , because i work in hardware store on screws segment now it makes a lot of sense
Top job - and love the rubber bolt, what an excellent demonstration tool! Kudos!
I made these stretchy silicone bolts and painted them, also molded the clear resin bolt, based on a mold of the 5/8-11 bolt I already had. Learned how by watching CZcams! czcams.com/video/PGytZQIVcuA/video.html the mold release in the video (Palmolive soap..) didn’t work for me so I just used 4-5 layers of Mann Release 200. Molding a silicone part in a silicone mold can be tricky because the part wants to bond to the mold of the same material.
@@markterryberry4477 just super clever demonstration of bolt stretch, I’ve been in the metalwork all my life and know it happens, but such a great demonstration. Well done 👍
love the refresher with some new (to me) info!
If you don't have a thread checker you can lay your screw or bolt threads against the tap to match them up
Thank you for the video. Always good to get a refresher on hardware sizes. I work in aircraft maintenance for a living so I deal with hardware that is identified all sorts of ways so when I’m doing car work or repairs on things around the house I have to remember how this all works again. Flight 5390 He removed bolts identified as A211-7D. However, if he had read the manual, he would have known that the windscreen was normally secured with the similar type A211-8D bolts, which had the same diameter but were about a quarter of a centimeter (Longer). So in this case a specialty fastener the number has some cryptic special meaning and the 7D vs 8D indicated the length not the diameter. So he used a torque wrench and torqued the fasteners which would not have worked with a smaller diameter. In aviation almost all nuts are self locking and so in this case the bolts failed to engage the self locking feature.
Honestly, this the best simplest introduction to threads. Game changer for me. finally makes sense to me.
Great tip. Previously I would use my tap and die sets to figure out the pitch with a small pitch gauge and systematically testing the screw/bolt in each cutting die. Blissfully unaware these basic templates existed. Amazon has had a sale today because this is a no brainer !!
Really useful & informative thanks! (...You did miss an important piece of information however “You pick up a bolt and identify it as not metric- immediately throw it away as,given the entire rest of the world has used metric since well into the last century, it’s important to get rid of anything that still uses stupid, illogical fractions”😂☺️😁)
Lol
DAMN IT! An elastic on the thread wires?! why didn't I think of that?
I always learn something from your videos. Thank you!
Missed a good one here.
Anyone ever notice that the Phillips head screws on Japanese motorcycle carburetors always strip?
That's because they're not Phillips, they're JIS (Japanese Industry Standard) and the tips of JIS screwdrivers are ground differently.
JIS screws are easily identified by what looks just like a punch mark on their head.
A JIS screwdriver set can be purchased online for $30 to $40 dollars and if you work on any kind of motorcycle with a Japanese carburetor I highly recommend buying a set, they'll save you all kinds of aggravation.
Phillips, Pozidrive & JIS are the three.
@@andycoombes
Yea they're the 3 that appear to be Phillips but I was talking about the JIS one's and why most motorcycle mechanics can't figure out why they can't keep from stripping what they think are regular Phillips head screws in them.
They don't need the Pozidrive set for those carburetors.
@@dukecraig2402 People always confused pozidriv and phillips here in europe.
Daft question. How come you still have carb Japanese bikes in the US? I ride a Yamaha from the 90s and it's fuel injected. I can't imagine there are many carb bikes left in the UK by now.
@@AdamMGTF Used ones probably. People love their old super cubs and stuff. They even made a whole anime about them in 2021, Super cub. Girl buys a used Super Cub. Her friend buys a 1980s Hunter Cub. They have a fun time getting their cylinders bored and increasing their replacement by 2CC or something, lol. They released a limited edition super cub, based on the featured in the anime weathering with you from 2019.
They had carburetors the whole time until 2008(not sure if they switched all models for all markets to fuel injection that year).
Thank you, Mark & Haas!
Great content - thank you Haas! 🙌
The exact same thing happened to me...12mm screws were used instead of 1/2", and when the vise came off the table, luckily another machinist was able to hold my ankles while I was stretched into the back of the machine...
:-)
Awesome.
My boss lost a torque wrench somehow and it landed inside the machine. Was quite the sight to see 2 coworkers of mine hold his ankles while they shoved him down headfirst trough the open door so he could fish it out of the coolant flooded bottom
Great video ! Must see for beginning machinists.
The fastest way to check if two bolts or screws are the same thread/pitch, is to hold them against each other from opposite ends. If they are the same, the threads will clearly fit together.
good luck if you are working on electronic devices that have very tiny screws and bolts.
like phones.
@@infinitybeyond6357 haha watch your butt on npt 1/8-27 American versus the bsp 1/8-28.
Haha they can be interchanged, once, if you really want it to be🤣🤣
Oh boy, I'm so glad I live in Europe so I don't need a book to know what the strength of my bolts are. And because various other reasons. 🙃
Lol, I bought the 26th edition Machinery's bible back when I started. I saw yours and it jumped out at me. Anyhow, great vid content, nice even for the seasoned ones that just like to refresh the memory or learn something new. Keep up the great work.
Coming from the UK as a fabricator welder we used to have the imperial system as our method of measurement .but I have to concead the metric system (European ) is by far the better system for measuring .for example when making engineering drawings you can fit so much more information in very simply and clearly .
They're both base-10 systems. Writing 1.00" takes the same number of digits as 25.4 mm. You could call them goatlengths, and as long as it's base 10, there's absolutely not l no difference. Base-10 is base-10.
Maybe maybe not some long some short .
Great video ! Very informative and easy to understand. Even though i work with imperial units quite a lot, metric is objectively easier to understand and use.
You may think easy now, just wait till they change to metric time. Instead of a clock going to 12, it will be 10. 10 months in a year etc.
@@kirbylee57 I already thought of that xD
Mark you're my favorite teacher !!!!
Quick tip for metric tap drill sizes. M number minus pitch converted to inch equals drill size needed.
This man is a national treasure and should be protected at all costs.
Well put together videos..
A big thank you.
It’s just amazing that you guy’s send somebody to the moon. Thx for showing.😜
I was just watching an episode of mayday on that flight he used as an example. It was fantastic getting a more in-depth understanding of what went wrong from this video. mayday just said it was faulty maintenance
Again valuable video. Thanks Haas!
I'm vf2 operater
Your tip very useful
Great video and information
Thanks
At last now I know what the stamping on the heads are , thank you
clear and well explained
...12:45... Those 8-32 screws were probably strong enough, but lacked enough thread engagement.
Very useful and interesting too!
6:05 All inch socket head cap screws are stronger than grade 8? Oh dear, no. Sure, lots are, but there are all types out there. Pick your favorite size in the McMaster catalog and you will find different strengths and materials available. Even assuming a steel black oxide screw, trusting greater than grade 8 strength is going to give you a bad day sometimes if you need that strength.
Great video thank you. Cheers 🇦🇺
Awesome video 💥💥💥💥 wating for more
I get a good chuckle when metric - centric viewers comment disparagingly about machinists working in inch dimensions. We predominantly work in a decimal inch mindset. The occasional need to convert from fractional inch to decimal inch becomes second nature, unless you're a full on halfwit.
2:28 and 3:43 is a super mechanic at work. Neo, move aside as you are just a Hollywood fancy but not Terryberry. And of all these, the pilot's legs have the highest tensile strength, as attested by his miraculous survival story.
Well done. Thanks.
Thanks Mark, this was very informative. Those of us with old British cars would benefit from a discussion of British Standard Whitworth ;-)
very informative video, and it made me hate the imperial system just that bit more
A bolt has a shank without thread, and may be used in shear. A (machine) screw is fully threaded. So I was taught.
Great vid !
thank you for the helpful video
That's amazing, Thanks a lot
Very good information
craftsman tools, I have snap on but craftsman are great, love them just as much if not better
3 radial lines = high tensile structural bolt. 1 1/4, 1 7/16, 1 5/8. 3/4, 7/8, 1". Ironworker for 20 years. I loved connecting A325 or A390.
Well done
I thought screws were anything that goes into a material with no mate, ie wood screw or sheet metal screw that there ca not be a nut for. And anything that can have a nut or mating fixture with threads was generally a bolt.
I've never heard that, but its interesting.
I was always taught that if it makes it's own thread as it goes in, it's a screw and if it goes into threads, it's a bolt
I agree you are correct but I know that at work if I use anything with a screw driver style head we call it a screw even if it is going into a nut plate or has a nut on the back. Technically it is a bolt. But you use a screw driver to tighten so you say Screw. Lol.
@@chattonlad9382 Your teachers are just wrong. Machine screws.
What about machine screws? They have a nut.
Very interesting.
The windscreen departing the plane would have been prevented if the tech would have used the correct screws listed in the planes illustrated parts catalog. That;s what is for, to get right parts and fasteners the first time. I wonder how the tech torqued those smaller fasteners. i know that it wouldn't work , just continue to spin. And you say co-pilot but the video shows the pilot, LH side . Great info on the fasteners BTW. lots of good info i didn't know . Thanks.
I have seen inch socket head cap screws that were grade 12.9. Have only seen it once, but it can happen.
U r as lovely as my dictionary .. THANKS A LOT
I have grown up, persay, using the imperial system. Notwithstanding, I do have high regard for the metric system and have used it extensively. However, due to the switching back and forth between systems, sometimes it gets confusing, as both systems work but are not interchangeable. It is hard for me to understand that a 10-32 can get crossed with an 8-32, but like I say, I grew up with this system but, it would be easy for me to confuse a 6mm with say a 7mm, or even a 1/4-20 with a 6mm. Therefore, I can't be to hard on the maintenance team, for they are under tremendous pressure to keep the machine running, no matter what. We maintenance people are necessary evils in industry. When the machine is running well, the company is losing money by paying us anyway, and when the machine is down, they are losing money because the machine is not productive. Therefore, whether up or down, the maintenance team is catching flack. So therefore, I think everybody in the industry is to blame from the top down and not just the maintenance team. We are the "whipping boys" of industry and are "necessary evils".
BTW, was an excellent, informative video and I do thank you and appreciate you. I am a retired Disabled Veteran and maintenance technician, holding a degree in Industrial Engineering Technology and am certified by the ISCET in industrial electronics.
Your brother, Steve, is a really good guitar player.
Well i beg to differ on the lines on the bolt head, you made reference(at 1:52) to the lines being inch & no lines being Metric, because when i was tower building the bolts we used were metric (M32) which did have the lines as well as the 8.8 grading on them.
Really good video but I would have added a rod bolt stretch gage in my talk, I use one, a tensile tester along with a profile projector and hardness tester when teaching industrial materials in my machinst program and we check dozens of bolts (screws) lol. PS: posted your video to my CANVAS account for my students.
That is terrific! We have ARP bolts across town, here in Ventura County, and we almost hit them up to get some footage of their Tensile Strength testing. We also ran quite a few tests where we torqued the screws past their Yield, and then again until they failed. That footage may end up in another video someday. Thanks for the comment.
8:36 Actually in order to get the right bolt the four things you need to know are the standard, material, thread size and length.
Nice catch. My notes originally said "In general, there are 4 parts to a basic straight screw thread..." but I got excited and started adlibbing. Your '4-things' are great. We have some different requirements when choosing a tap, or matching a bolt, or when inspecting a bolt we've made. Thanks for the comment
@@markterryberry4477 I'd be interested to know how often people actually go through the trouble to use an optical comparator for threads. Just about every bolt uses 60 degree standard threads and if it's something different like left hand thread, ACME, buttress, tapered, etc then it's generally pretty clear by looking at it or by the application that it's not a standard thread profile. Is it mostly for checking tolerance classes of standard thread profiles or taking measurements on non-standard profiles? It seems odd to use it in a situation where a set of go/no-go gauges would be quicker and probably cheaper than an optical comparator.
@@AndrewMerts I really loved our optical comparator when working in a job shop. You’re right though, it’s not as common as it used to be I think. We rely on thread plug and ring gages more often now, along with the the major diameter of our threads, and maybe pitch mics on male threads. We trust our inserts to be 60 degrees, or 55degrees, or 29 degrees, but for me, it’s a dimension (the angle) that needs to be verified on the part, just like anything else. Our pitch diameters are unlikely to be correct if our thread angles are off though. Great comment.
Metric bolts minor diameter is also its major diameter minus its pitch. so if you are tapping a hole for a M12x1.75 you would chose a drill by subtracting the pitch from the diameter. 12mm-1.75mm= 10.25mm tap drill. or an M6x1 would be 6mm-1mm=5mm tap drill.
I always call self-tapping screws ‘screws’ and anything that screws into a pre-tapped hole a ‘bolt’
Doesn't NASA use both metric/imperial parts. Not to worry, a good Engineer will always have a mechanic to blame🤣🤣
why didn't you give us some suggestion on products we could purchase to help us with this process? i am sure this would be of a great help to many of us who wouldn't know which ones are best to have. Maybe you could do another video doing just this.
I find my Milwaukee impact gun will make a bolt have any threads I need 🤷♀️
We are a fastener manufacturer , main products are hex bolt and nut
as a mechanic, nothing i work on that needs replaced/repaired has markings on it anymore.
Then theres BSW, pipe threads, tapered threads. I live in a country that uses metric, but we need to know UNC/UNF and Whitworth.
Haha I've almost been filled by npt 1/8-27 vs a bsp 1/8-28.
They can sometimes be interchanged once in a pinch but I wouldn't recommend it on something that's gonna be taken apart ever again. 🤣
I prefer separating screws and bolts by whether they are intended to cut their own thread or be inserted into an existing thread, respectively.
And then there's Acme threads. For the people who need trapezoidal threads over triangular. We don't talk about square threads.