How to Measure Bolts, Nuts and Screws Using a Thread Gauge Size Tool 

Thanks! After decades as a DIYer, I learned something new here; namely, that the fastener length is "whatever goes into the hole". So, for flat-head machine screws, the official way is to measure the *whole* length. Not a big deal if you're taking a sample screw to the store to match, but is important if you're ordering without a screw to match.

It's 5am here and I've been trying to catch up on my drone setup videos when I came across this. Very informative and well-explained! Your effort is much appreciated.

You checked the thread pitch wrong. The ridges are above the labels, but you tested the ones below. For example, at 3:29 you say "I'm going to come over to the 13 and try that", but you use the ridges _below_ the 13. The ridges for 13 thread pitch are actually above the "13" label. At 5:28 you say 18 but are actually on 20.

Very hand tool. Cleverly and concisely designed, also great concise presentation as well. Edit: Oops, meant to write "handy tool" but I guess my meaning came through. Thanks much.

Would it kill you to do at least ONE metric example?

Very helpful, had a gauge for sometime but never really knew how to use it till now!

Thank you and have a blessed day.

awesome video, just what i need. Great step by step instructions. Thank you!! will be buying a few of these for each tool box. Invaluable knowledge

After wasting time on google searching for the answer w no luck this was just what I needed, THX!!!

Great explanation of all the functions available, better than other videos. 👍

Thanks for the lesson. Nice, clear and to the point.

Thank you for the printable table, lost mine last week.

Extremely helpful and direct. Thank you for this.

Well done video . Learned a lot of things I didn't know but always wanted to. Thanks.

Thanks for all you do.

That was extremely informative and useful. Thank you.

Nice! I often go to the hardware store and eye balling things. Now I'll be more prepared, thanks. 😉

Thanks for explaining the use of that nifty tool! Very useful!

Excellent presentation! Now I know how to use this tool! Thanks so much!

This is really cool, it will come in handy for future projects!

Yes! Thank you, I have a lot of fasteners I need to measure.

I've just bought one of these, so this video gives me much joy

Great video. Demonstrations were easy to follow.

Great video Andy! Thank you

Learning about markings on bolt heads goes a long ways also. If you see three or 6 lines evenly spaced in a radial pattern on the bolt head that's an sae grade 5 or grade 8 respectively. Graded metric bolts will have 5.8, 8.8, 10.9 or 12.9 stamped on the head. On a flathead screw the angle of the countersink is also an indicator. 90 deg is metric and 82 deg is SAE.

You guys need too sponsor Jimmy oakes he is in desperate need of your expertise from little Chris in the UK

Just ordered one, I was looking up reviews for this tool and your video came up, love the information and demonstration.

Just bought your tool on Amazon. Thank you. Can't wait to use it.

Excellent. Thank you

Well done presentation. I liked it a lot. Cordially, RE Morgan Decatur, GA

Now I understand! Easy! Thanks.

This whole time i would screw it in thinking that we the fit. I need this gauge. Awesome vid!

Great video!!

Thank you, very well presented.

Super useful, thank you!

I don't feel like you measured a screw? I have a wall plug and a screw and I want to know which drill bit I would need to use. I have the measuring gauge you have but still did not figure out what drill bit I need :(

Excellent tool and presentation, thanks!

Hi, Thank you for your video. I bought a ruler very similar to this one (seems exactly the same one, but I bought it elsewhere without a logo). 1. In your pdf file inch table, what units are the 0 to 10 in the bolt diameter (it can’t be multiples of inch, the holes in the red ruler 4 to 10 in the inch line are way too small for that) ? 2. In the ruler I have, the size of the metric holes don't fit what it says. For example, the hole 12mm measures 11.5mm (used my caliper), 22mm measures 21.5. I was wondering if yours measures the same ? 3. Is this ruler also good for wood screws ?

Great information absolutely enjoyed it! Thanks!

Thanks, just got one of these tools myself, and I wasn't sure if the bolt diameter was "the hole it fits in snugly" or "the one it no longer fits in" because of the threads themselves.

Good video and gauge. Also, it might help to use the correct thread pitch when confirming whether or not the bolt is fine or coarse.

Thank You !

Could you also make a video about how to measure drill bit sizes?

Ty you thaught me something i wondered about and you taught me how to use the guage

Thank you.

Thank you

Good tool. metric bolts have a number on the head. 4.6 8.8 10.9 12.9 that indicates the material properties. (See google)

I have a graphite part with 3/16 holes in it- what diameter bolt might fit well?

Thanks

Excellent ! TY.

Thank you awesome information

Hot Damn! That's awesome. Sold!

very good video

thanks for the video. helped a lot

this was very helpful, thanks

great video 👌

Thank you ! I just got one of these off Amazon and everything written on the package wasn't English and on a good day I can barely speak that

Thank you I need to buy one of these

This is awesome. Thanks I’ll be buying a few gauges.

HOWdy B&N, ... Thanks ... COOP the WiSeNhEiMeR from Richmond, INDIANA ...

Thank you very usefull !!!

what about socket head cap screws aka allen bolts how are those measured

What if you pick up a metric nut, will it confuse someone to think that it might be imperial after using the gauge?

Okay nuts and bolts experts, a question from a novice house maintainer. My mower has a countersunk hex bolt and I need to go buy a tool to take it out to clean underneath. How do I know what size driver to buy? I can't take it out to measure it, as I have no tool to do so.

Is this tool a must have for bike mechanics? I would like to gift this to someone

Good video! . When i seen your video went purchase one of these good to have around.

Seems to be out of stock. Would love to pick up a few templates. When you guys restocking?

what if you have an uncommon tpi

This is a serious question but how did you become “certified” is there a course you can take?

What size nut driver will I need for the 1/2 bolt to fasten?

Very good presentation. Thanks for sharing

So what would have happened if it was a metric nut? I suppose it would be slightly loose. Not great though

A 10mm bolt needs a 10mm wrench. What size wrench is needed for a 3/8 bolt? That is a nice gauge,

GOOD VIDEO

How about metric M8-1.25, how many thread?

Odd that your gauge says "USA thread pitch". Imperial isn't 'merican :) ..also, all new American cars (and most everything technical) are all built using Metric! Cool tool BTW!

I'm looking to size some small screws for a guitar. Will this product work for that? Thanks in advance.

Nice tool.

What if I need to measure a threaded hole from a second hand dresser?

cool!!

Metric is so much easier.

What size screw fits into the standard 5?

from where available ? and price ?

Where can I get a gauge in the UK.

little one then little bigger then little more bigger then off to the hardware store cause never have the right one or the washer

You should have mentioned “Grade” also.

GOOD

And I’ve been measuring the size of my nuts the wrong way all this time.

My car has a lot of 13 mm bolts.

Not a ruler! It is a scale.

Change to metric and everthing will be easier ...

Blessings, John 3:16. Jesus loves you.

Why are you when talking you moving your hane

Funny that you didnt show-case the Metric portion etc. So the explanation is Half $^& which is poorly done. Do it right or not at all. Most people will be using metric bolts more than anything

You don't include the threads portion of the bolt in your length. Only the shank (grip length). The grip length will change with every bolt size. A 6" bolt will have the same amount of threads as a 9" bolt but the 9" bolt will have a longer grip length. The grip length (shank) is the portion of the bolt that is the same thickness of whatever material you are bolting. Bad video.

Lost me on the nuts..When you are teaching something that's obvious to you, you MUST appreciate it's not obvious to someone else..Ever taught someone to drive?

What are those products which still use standard threaded bolts? Are you repairing very old machinery? Stop perpetuating a stupid system!

Thank you