Keyhole tooling is used to fabricate a wide variety of parts. A few examples include banjo eyes on tow trucks, storage racks, and shelving units.
Let’s start with keyhole shelving units. Storage racks and shelving units are the most popular use for keyhole punches and dies. The picture below shows a perfect example. The keyholes are used to securely lock each shelf into place. These holes also make it easy to assemble and disassemble the shelving unit if necessary. Storage racks and shelving units like this can be found everywhere from the shop here at Cleveland Punch to your nearest home improvement store.
Another example where keyhole tooling is used is tow trucks. Many tow trucks use safety chains to secure a car, truck, or load to the bed of the truck. How do these chains connect to the bed of the truck? The answer, banjo eyes. These banjo eyes are fabricated with keyholes. The safety chain is fed through the round portion of the keyhole. When tight, the chain slides down the oblong portion of the keyhole to lock it in place. Next time you see a tow truck take a look at the bed. There’s a good chance you’ll see one of these keyholes.