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Post by Curtis on Nov 13, 2018 10:25:02 GMT -5
Sealtech supply will set you up. If only I lived somewhere sensible where I could buy such things easily. NL is the worst. Some bearing shops can supply you as well (so I have found here in Ontario anyways)
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Post by Walms on Nov 13, 2018 10:26:24 GMT -5
The one thing to remember is it’s the bore minus the root diameter of the groove divided by 2 to get the compressed height of the o-ring. Just measuring the depth of the groove is a bit misleading as the piston likely has a couple of thou clearance, but yeah, 1.3 to 1.5mm cross section is likely the range. You can try any hydraulic supply, they should be able to send you in the right direction in the very least.
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Post by tdub56 on Nov 13, 2018 10:46:39 GMT -5
Thanks guys. Walms, the bore measured out to ~10.3, and the groove is ~7.9. That's why I'm thinking a 7.5mm ID with a 1.5mm cross section. Something a bit thinner would be good, I'll have to scour the imperial size charts to see if something is closer.
Looking at the size charts, looks like the ones I have appear to be something like an inch size -011, which is approx 1.8mm CS, 7.9 ID and 11.1 OD. Definitely not ideal. Or they're a metric 2mm CS x 7mm ID. Both wrong for the dims of the shaft/bore.
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Post by Walms on Nov 13, 2018 12:01:25 GMT -5
O-rings are funny because the spec’s size and cross section are not always equal. Sealtech is the local supplier for the parent co. www.sealsonline.com you can download their complete catalog that gives you all the recommended sizes for grooves etc., plus a listing of all metric and inch seals. I think you are on the right track, if cross section is a bit too big, go with a smaller ID to help compensate for that. The biggest issue is minimum payments for these guys, generally $25 here. For that money you should be able to get a variety as they are less than a buck each.
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