Not sure, a grade that is flame hardenable as I believe only the teeth are hard with a softer core for toughness. They need to be plasma profiled then final machined on a lathe for the bolt holes, ID, chamfers and tooth profile. I was quoted £175 just for a mild steel profiled blank version to trial on.
This a jpg of the CAD I did, can send you the .dwg file if you like:
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Alastair
Lincoln, UK.
Under Restoration:
1944 No2 MK2 Loyd Carrier - Tracked Towing
1944 Ford WOT6 Lorry
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