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Hole tolerance help needed.

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Brian Abbott	19/03/2019 22:40:11
523 forum posts 95 photos	Hello all, can you offer me some advice. If i have a diameter 63mm with a h6 tolerance. (Guide bush) What tolerance should i apply to the bored hole to ensure a good slide fit ? I have never been any good with tolerances, normally i just machine to fit but on this occasion i am having the holes bored by a contract machining firm in spain and want to make sure i give them the correct tolerance. Thanks for any help.
Jeff Dayman	19/03/2019 22:43:15
2356 forum posts 47 photos	Is it sixty three mm or six point three mm with h6? Just want to be sure before looking it up.
Brian Abbott	19/03/2019 22:44:55
523 forum posts 95 photos	Hello. yes, 63mm not 6.3mm Thanks
Phil P	19/03/2019 22:51:39
851 forum posts 206 photos	Depends what you are aiming for but H7 would be a good starting point imho. Phil
Jeff Dayman	19/03/2019 23:02:25
2356 forum posts 47 photos	G7 / h6 will give a sliding fit (clearance, but not free running) According to the chart I use: G7 for 63 dia hole has tolerance +0.04 / +0.01. Limits 63.040 / 63.01 h6 for 63 dia shaft has tolerance +0.00 / -0.019. Limits 63.000 / 62.981 If you need a close running fit F8 / h7 might be a better choice
Brian Abbott	19/03/2019 23:14:07
523 forum posts 95 photos	Thanks Phil, Thanks Jeff. I have just been through the suppliers info and i think i have wasted your time, sorry. Bush size is 65mm +0.019 + 0.030, Hole size should be 65mm +0.00 + 0.019 (H6) Thanks for your time both. Brian
mechman48	20/03/2019 09:59:26
2947 forum posts 468 photos	Hi Brian Get yourself a 'ZEUS' book; it has the charts for ISO fit BS 4500- 1969 for clearance, transition & interference fits, plus a lot of other useful information. George.

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