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Agma 8-CH-13 quality designation 2

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spigor

spigor

Mechanical
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Aug 4, 2006
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I have a gear drawing with "Quality 8-CH-13" designation. I suppose the quality class required is 8, but what does the 13 stand for?
 
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Just a guess. But if CH means Carburized & Hardened then the 8 could be the quality before CH and the 13 could be the quality after CH. Often the process is to hob the gear, heattreat it, and then finish grind.
 
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never guess

the Q-8 CH 13

The CH 13 = alloysteel carburized 55 HRc min

AGMA 2000-A-88 Page 24 & AGMA 240
 
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