5/8" (15mm) Hot Glue Guns
No. Even though the 1/2" stick is smaller, it will not feed through a 5/8" glue gun. Furthermore, trying to use a 1/2" glue stick in a 5/8" gun can cause the gun to jam and break so we strongly recommend not trying, just take our word for it that it won't work.
We get this question a lot. A 5/8 glue gun typically offers a larger heater and more wattage allowing it to dispense at a higher volume. More importantly, a 5/8" glue gun can use 5/8" glue sticks. That means more adhesive can be dispensed per trigger pull and the glue stick needs to be replaced less often because it is larger than the more traditional 1/2".
Kind of a tricky question. Some 5/8" glue guns are a little bulkier than traditional 1/2" versions. This can make a little more fatigue with long term use but isn't a complaint we get often. We also carry a great 5/8" glue gun - the TEC 805 - that offers all of the benefits in a smaller footprint. Glue gun stands and hangers can also help with larger glue guns.