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Help with Ansi B17.1 Application for Key Fits

Help with Ansi B17.1 Application for Key Fits

Help with Ansi B17.1 Application for Key Fits

(OP)
I have shaft that requires a 1.25" nomimal key. I am trying to understand B17.1 so i can specify the shaft, hub and key dimensions and tollerences and ensure i don't have an interference fit key.

Applying ANSI B17.1

Depth tolerance for class 1 fit per table for Standard fits for Parallel keys.
Key +0.000 to - 0.003
Shaft keyseat +.000 to - 0.015
Hub keyseat +.010 to -0.000
Fit range 0.033 clearence to 0.005 clearence

How are they calculating there fit ranges??? I cannot get the math to work.

To me, max clearence would be largest keyseats with smallest key
= .01 oversized keyway with .003 undersized key
= .013 Clearence

Minimum clearence would be smallest keyseats with largest key
= .015 undersized key with nominal key
= .015 interference fit

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