Countersunk head screws have a 90-degree conical shape that can be fully sunk into the pre-opened counterbore after locking and having a completely flat and burr-free surface. This is the preferred ...
I've used them for ages but never had to buy them. Is there any practical difference in the various sizes of screws and cage nuts? M6 seems to be the prolific choice, but I see 12-24 and 10-32 are ...