Is か(個)/ヶ a productive component in measure words (助数詞)?


I have only seen か(個/カ/ヶ) in か月、か年（五か年計画）、か国（六か国会議）、か所、か条.

Is it a productive component which can be used in making other new measure
words?




No, it’s not. You cannot coin a new counter like this.

**EDIT:** か月, か国 and か所 work as ordinary counters in contemporary Japanese,
but others usually appear in historical terms (e.g.
[五箇伝](https://ja.wikipedia.org/wiki/%E4%BA%94%E7%AE%87%E4%BC%9D)) or fixed
phrases (e.g.,
[三が日](https://ja.wikipedia.org/wiki/%E6%AD%A3%E6%9C%88%E4%B8%89%E3%81%8C%E6%97%A5)).
If you are working on historical fiction or fantasy works, you might use this
pattern to create a new archaic-sounding term for use within the work. For
example, something like 三箇龍玉 or 三ヶ龍玉 (Trinity Dragon Orbs) seems reasonable to
me as a keyword in a fantasy work, even though Google does not know a single
example of this. Still, this is a very rare convention, and I doubt this would
be considered "productive" in the linguistic sense.




No, it’s not. You cannot coin a new counter like this.

**EDIT:** か月, か国 and か所 work as ordinary counters in contemporary Japanese,
but others usually appear in historical terms (e.g.
[五箇伝](https://ja.wikipedia.org/wiki/%E4%BA%94%E7%AE%87%E4%BC%9D)) or fixed
phrases (e.g.,
[三が日](https://ja.wikipedia.org/wiki/%E6%AD%A3%E6%9C%88%E4%B8%89%E3%81%8C%E6%97%A5)).
If you are working on historical fiction or fantasy works, you might use this
pattern to create a new archaic-sounding term for use within the work. For
example, something like 三箇龍玉 or 三ヶ龍玉 (Trinity Dragon Orbs) seems reasonable to
me as a keyword in a fantasy work, even though Google does not know a single
example of this. Still, this is a very rare convention, and I doubt this would
be considered "productive" in the linguistic sense.

