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Gear and Pinion Hardness Numbers

Gear and Pinion Hardness Numbers

Gear and Pinion Hardness Numbers

(OP)
I have posted this question in the Gear and Pulley Forum   but just in case there is a reader who is not a regular in that area I will also ask it here.
A recent request for quotation stipulates that in a gear set the gear MUST NOT exceed 300 BHN and the pinion 350 BHN hardness.
Is anybody aware of the possible origin of such a requirement?

RE: Gear and Pinion Hardness Numbers

It certainly seems like an odd request to me.  The only thing I can think of is very low temperature performance-- trying to keep surface hardness low so that a brittle carburized layer is not produced.  Another thought is perhaps to prevent steel from even being considered-- maybe someone wants these parts to be bronze...?

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