Pickaxe dimensions

[Lynn Eades]

Hanno, the two shown in your two photos are (obviously) different. The first is an American type, while the second is British (as found on carriers). The American pick heads come in different lengths (not sure about military ones), and I wonder if that is why the one on the back of the CMP is not sitting its end against the rub plate.
Interestingly I have a pick mount that takes (what I assume to be?) an American pick, but has a BSF thread on the stud.
The shorter (lower) one is from a Canadian U.C.
The longer (higher) one , I'd like to know its original application?
The Australian carrier used the American pick, but used Unified thread forms (plus BA for small stuff) So, i don't think its from there.

Btw, with the British helves, the early ones had a steel ring at the hand end (WWI) the later ones were plain. These were used through WWI and WWII.