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Search our list of Metric O-Rings. O-Rings included on this list are either included in an International Standard, or measure in even mm increments. If you can't find your O-Ring seal in this group, be sure to check out "All O-Rings".
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Unit of Measure
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Item #

C/S Metric (mm)

ID Metric (mm)

OD Metric (mm)

Std Shrink

Special Shrink

Reference Size

173-1.225 N/A 4.40 N/A 31.10 N/A 39.90 N/A Yes N/A N/A
178-165 N/A 4.50 N/A 4.20 N/A 13.20 N/A Yes N/A N/A
178-767 N/A 4.50 N/A 19.50 N/A 28.50 N/A Yes N/A N/A
176-1.944SS N/A 4.50 N/A 50.0 N/A 59.00 N/A Yes N/A N/A
176-2.145VS N/A 4.50 N/A 55.10 N/A 64.10 N/A Yes N/A N/A
176-2.600SS N/A 4.50 N/A 66.60 N/A 75.60 N/A Yes N/A N/A
177-2.925 N/A 4.50 N/A 74.30 N/A 83.30 N/A Yes N/A N/A
181-4.488 N/A 4.60 N/A 114.00 N/A 123.20 N/A Yes N/A N/A
185-3.260 N/A 4.70 N/A 82.80 N/A 92.20 N/A Yes N/A N/A
186-4.095SS N/A 4.70 N/A 104.30 N/A 113.70 N/A Yes N/A N/A
187-8.553 N/A 4.70 N/A 216.50 N/A 225.90 N/A Yes N/A N/A
189-5.650 N/A 4.80 N/A 143.00 N/A 152.60 N/A Yes N/A N/A
187-9.126SS N/A 4.80 N/A 234.30 N/A 243.90 N/A Yes N/A N/A
190-870SS N/A 4.90 N/A 22.50 N/A 32.30 N/A Yes N/A N/A
193-1.158 N/A 4.90 N/A 29.40 N/A 39.20 N/A Yes N/A N/A
197-276 N/A 5.00 N/A 7.00 N/A 17.0 N/A Yes N/A N/A
197-866 N/A 5.00 N/A 22.00 N/A 32.00 N/A Yes N/A N/A
197-984VS N/A 5.00 N/A 25 N/A 35.00 N/A N/A Yes N/A
197-2.921 N/A 5.00 N/A 74.20 N/A 84.20 N/A Yes N/A N/A
197-4.921 N/A 5.00 N/A 125.00 N/A 135.00 N/A Yes N/A N/A
197-5.197 N/A 5.00 N/A 132.00 N/A 142.00 N/A Yes N/A N/A
197-5.708VS N/A 5.00 N/A 145.00 N/A 155.00 N/A N/A Yes N/A
197-14.764 N/A 5.00 N/A 375.00 N/A 385.00 N/A Yes N/A N/A
197-17.520VS N/A 5.00 N/A 445.00 N/A 455.00 N/A N/A Yes N/A
197-20.669VS N/A 5.00 N/A 525.00 N/A 535.00 N/A N/A Yes N/A
Unit of Measure
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