The o ring is placed into a groove to secure them in place, and then compressed between two surfaces. X1 Square O-Rings are used to block a path which may otherwise allow a liquid or a gas to escape..
A carriage bolt has a domed or countersunk head, and the shank is topped by a short square section under the head..The square section grips into the part being fixed (typically wood), preventing the bolt from turning when the nut is tightened.
Ideal for any project involving light gauge sheet metal, awnings, door and window frames, gutters, sheds.. A self-drilling screw, or tek screw, is similar to a sheet metal screw, but it has a drill-shaped point to cut through the substrate to eliminate the need for drilling a pilot hole.