These metric screws have a silicone O-ring that prevents leaks and seals out contaminants. Made from 18-8 stainless steel, they have good chemical resistance and may be mildly magnetic.

To prevent leaks and seal out contaminants, these metric screws have a silicone O-ring under the head.

A rubber O-ring under the head creates a seal that withstands liquid and gas pressure.

The drilling screw stud drills its own hole.