Are these screws self-lock?

Hi, All,
Although my question are about screws, the screws are used in RF circuits.
So I asked the question here, in this RF forum, surely I like this forum.
I got a mated screws, the question is that the screws don't have nylon to lock it.
So I doubt that the screws are self-locked, and the screw is composed of 54% Cu and 46% Zn, are they really self-locked?
Attachments are the datasheet.
Any comment?
many thanks.
Best,
Tony Liu

No, those are not self-locked screws.
They are presented as in the pictures below:

http://www.automotioncomponents.co.u...nformation.png

https://system.netsuite.com/core/med...33f47c68296382

Hi, many thanks, vfone.
Best Regards,
Tony Liu