A: There are two primary differences: design and installation.
As the name implies, coil inserts are steel wire coiled in a
spring-like design. E-Z LOK threaded inserts are screw machined
out of solid steel.
To install a coil insert, the user must have a special
drill, special tap, and special installation tool. If a tap breaks
or the installation tool is misplaced, the coil inserts can’t
be installed until a new tap or installation tool is purchased.
E-Z LOK threaded inserts have standard size/pitch threads so they
can be installed using standard tools you probably already have
in your toolbox. For example, if an E-Z LOK with a 1/2-13 external
thread is being installed, the user simply drills the hole with
a standard 27/64 drill and then taps the hole with a standard 1/2-13
tap. Once that’s done, the insert is threaded into the hole
like an ordinary fastener using a screwdriver, bolt and jam nut,
or an E-Z LOK drive tool.