allen wrench?

Question

which size does it take to open a push button door?

Doors like a public places,school,ect.

Answer 1

If you are refering to the hex key that sets the crash bars in the "held in" position, I would suggest you get one of those sets of allen wrenches in a handle that looks like a jackknife because I'm not certian if all the door handle companies use the same size. The ones where I work look like they might be 9/64th

Answer 2

An Allen wrench (known also as a hex wrench or hex key) has a hexagonal cross section to fit screw heads with hexagonal recesses, common in bicycles, motorcycle engines and, increasingly, build-it-yourself furniture. With motorcycles, Allen fastener heads allow an engine cover to be mounted flush to an engine case without protruding bolt heads.

Allen wrenches are made in fractional inch and metric sizes. Probably the three most common sizes are 5/32-inch, 3/16-inch and 1/4-inch—in metric, 4-, 5-, and 6-mm see a lot of action. Other good SAE sizes to own are 3/32-nch, 7/64-inch, 1/8-inch, 9/64-inch and 7/32-inch. It's difficult to say what sizes are common when assembling furniture, because as anyone with experience at that job knows, those little L-shaped keys tend to disappear immediately.

https://www.electrikals.com/products/r/electrical-tools/a?cid=693&mid=43&mid=48&mid=34&cnid=219&page=1&pageSize=15