To write this article and shoot the corresponding video on YouTube, I was prompted by the purchase of this wonderful

It would seem ... Ordinary hairpin ... M8 thread.

Yes, that's only when tightening the nut, the thread breaks off with a relatively small effort. I don't have a torque wrench, so I can't talk about a specific figure.

When buying a stud, I did not pay attention to the thread. And he began to consider it after he plucked it.

This is a small study I now offer you. For those interested - at the end of the article there will be a link to the video.

Something is clearly wrong with the thread: it is clear that the profile of the turns is somehow too high, and the angle of each profile is sharper than usual.

I have a thread gauge. Also Soviet. I very rarely use it, but today it is very useful to me!

We will bring the scammers to clean water!!!

After choosing the appropriate template, I attached it to the thread of the stud.

The result is in the photo below.

As you can see, the height of the profile of each turn is 2 times greater than it should be. Moreover, the profile angle is not 60 degrees, but much less. I don't think there are even 30.

And now let's see how things are with the thread on the Soviet bolt.

Beauty!!!

The thread profile fits snugly on the thread gauge template!!!

There are slight gaps in the hollows of the profiles, but this gap is provided for by GOST. So… No complaints at all.

Well, how, please tell me, can you trust such materials?

I don’t want to say, they say: “There is nothing to do in the store without a thread gauge.” But if you buy bolts, studs for any critical nodes .... Still worth checking out.

And if you do not have a thread gauge, put any Soviet bolt with the desired thread in your pocket. It can be used as an impromptu template!

What do you think about the quality of modern and Soviet instrument?

Video version of the article: