Bristol Keys

[protoolman]

Just saw an old set of " hex keys" as my dad calls them or "Allen wrenches" as the younger guys know them. This old set were called " Bristol keys". I believe I had heard that name from real old guys in the past. Anyone remember that? Bristol was a company apparently like Allen.

 

[eveled]

They were used in electronics a lot in the 60's and before back to WW2 I believe. They were a spline drive. The only time I've seen them was in X-celite sets.

https://bristolwrench.com/about/

 

[protoolman]

Interesting
The set of antique Bristol keys I found were just regular hex keys.