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LETTER "H" AFTER DIAMETER | |||
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Posted by: CRAMER ® 07/09/2010, 15:59:37 Author Profile eMail author Edit |
I"M WORKING WITH A METRIC PRINT,
AND I NEVER SAW THE LETTER "H" AFTER THE HOLE DIAMETER. PLEASE WHAT DO'S THIS MEAN. EXP. 34 H10 +0.10 -0.0 & 31 H11 +0.16 -0.0 THANK YOU TIM |
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: LETTER "H" AFTER DIAMETER -- CRAMER |
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Posted by: jboggs ® 07/09/2010, 18:43:27 Author Profile eMail author Edit |
You have encountered the metric standard for shaft and hole fit tolerances. If you have access to a Machinery's Handbook you can find a complete explanation there. I thought it was on this website, but was unable to find it. Maybe Kelly can help you with a reference. These fits are based on letters, upper case for shaft and lower case for hole (or vice versa, not sure which). |
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: : LETTER "H" AFTER DIAMETER -- jboggs |
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Posted by: Kelly Bramble ® 07/12/2010, 19:35:24 Author Profile eMail author Edit |
The mechanical tolerance standard reference in the USA is ANSI B4.1-1967 (R1999). The referenced tolerance seem to be an LC 9 grade of the referenced standard. The equivalent SI units tolerance grades (metric) is ANSI B4.2-1978 (R1999). An H11 is catagorized as a "Loose Running" fit. Another possibility is BS 4500:1969 - which is a British (UK) standard. There is an ISO standard used by most EU countries, I do not know what that reference is. You should determine the country of origin to know which tolerance standard applies or simply ask the drawing originator. Modified by Kelly Bramble at Mon, Jul 12, 2010, 19:36:56 |
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