9mm mortise chisel wanted

**Chief Tiff** · 6th June 2020, 09:14 PM

I have a small project coming up that specifies 9mm mortises; does anyone have a 9mm mortise chisel they’d like to offload?

It’s an uncommon size I know but I’m trying to avoid buying an oversized one and grinding it down to fit; and I can’t change the mortise size to suit a 3/8” or 10mm.

**markharrison** · 8th June 2020, 01:13 PM

Maybe you can't go up in size, but you could go down. The difference in strength between 8mm (or 5/16") would be marginal.

I doubt a 9mm or 23/64" chisel (of any kind) was ever made, on purpose anyway.

**Chief Tiff** · 8th June 2020, 04:27 PM

Thanks Mark, but it has to be 9mm exactly. Can’t go bigger, can’t go smaller

.

I’ve found references to Japanese chisels in this size, plus Henry Eckert lists one but doesn’t seem to want to provide any details beyond it featuring on a list.

The most hopeful is a Kirschen available from Ideal Tools, but they don’t supply a picture and the Kirschen part number they quote is no longer current. Still, if I get no bites here I’ll give them a call.

Thanks for responding anyway.

**Fuzzie** · 8th June 2020, 06:09 PM

I might be just a Klutz but my mortises are rarely EXACTLY the width of the chisel used to cut them. If I ever had a requirement for an exactly 9mm mortise I think I might be starting with an 8mm chisel anyway, possibly 7mm.

**rod1949** · 8th June 2020, 09:51 PM

Use a 9mm drill bit.

**barramonday** · 8th June 2020, 10:58 PM

Shame Stu ( tools from Japan ) is not operating anymore, he was definitely able to source specific sizes like this.
Perhaps if you don't have luck elsewhere try Stan Covington for a good quality Japanese chisel.
About Covington & Sons Tools – Covington & Sons Tools

**Chris Parks** · 8th June 2020, 11:25 PM

Here you go

Japanese Mortice Chisel - Mukomachi Nomi 9mm – Japanese Tools Australia

**clear out** · 8th June 2020, 11:47 PM

I thought they would have them Chris.
I was at a sharpening class there a while back and got looking at their hollow mortise bits and they were all sorts of weird sizes like 9mm.
H.
PS it was thanks to your post I attended the sharpening class, enjoyed it a lot.

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