SAE and Metric Bolt Gauges Check a Thread Nut Fastener Size

This a great set to have, at an affordable price. The numbers are very clearly marked. The rails and threads seem solidly made and durable so far. It has more thread size options than most of the other options I’ve seen online. The colors also make choosing the right set easy.

Quality item, sure to survive weekly use in a busy shop. The mounting points and base are robust.

It is exactly what we needed. We have several nuts and bolts and will be doing more sorting. This is perfect for what we need. My get another one for the other shop so we don't have to go between buildings.

11.19.23. This is my second set. The first was for the auto shop we have and this is for the home shop. With the price of nuts, washers and bolts going outrageously expensive; especially metric it was time to sort the bolts and nuts I have. Once you have spent some time sorting you save a lot of time knowing what you have before buying new. I bought two small metric bolts locally for over $3 and then later found some used ones in a bucket. If I did that 30 times excluding time and gas it would pay for the tools. I have bought some other checkers but they are a waste of time compared to these. Company has fast shipping and great to deal with. Highly suggested for the high quality.

I give the product 3 stars, and add a star for the seller working with me, but I can't quite give it 5 stars.The originals pair I received looked like the plastic was stress cracked where several of the bolts and nuts get pressed in. It seems like maybe the clear coating or surface of the plastic is what's cracked, and that it may not be actually cracked all the way thru. There are several spots like this. Apparently they cast these, then press the nuts and bolts in, and the pressing process stresses the plastic and cracks the surface finish.Also, these are designed to be bolted to a wall or something, but that puts the surface where the nuts and bolts are at a 90 degree angle to the wall it's bolted to. That design just doesn't really work well. Why not just make it flat and bolt it to the wall like the other long skinny ones that are available.I sent back the first set I received because I was disappointed to see the stress cracks all in the plastic, and assumed they were defective. The seller worked with me just fine, and sent me another set... the best he had. They were hardly any better than the first set. Apparently you can expect them all to be this way. If they cost less, I would have accepted that better, but these are a premium price. FYI, these things are rather big!On the up side, it looks like a lifelong tool that will be very useful, and this set has the most sizes I've seen. It's functionality is great, and better than it's form. This would be super useful for determining what nut or bolt you have, and whether it's standard or metric, or what thread pitch. It's a killer set, and kind of a shame that the finish doesn't quite match up with the rest. Despite that, buy it. It's useful!

If you wrench like I do, you always end up with all kinds of extra bolts and nuts, all different types and sizes. Which is great, but not. Because if you don't know what type or pitch or size it is, you will never use it when you need it. I have seen these things in hardware stores and always thought man, I could really get all of my excess bolt/nut collection in order so I know what I have, and I've gone through about half of what I have, and what a blessing. These take the guesswork out of all of it. Now I know when I need a certain size it's right there in the right bin. No more guessing, fitting, etc. Grab and go. Worth every dollar.

It was expensive and takes up a lot of space. That said, it’s much better than anything else Ive tried, so I’m happy with it and would still make the purchase. Yes there are cheaper ways to do it but if you have a lot of pieces that are all mixed up, how much do you value your time?

Very nicely constructed. Solid group of common nut sizes and bolts. Some fine thread types missing. Kind of big & bulky fir home use, better for a Home Depot or Ace or Lowe’s type setting where customers can find that one nut they need. I keep these handy to find SAE vs metric sizing. Very Helpful.