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Metric O-Rings are employed in specialized applications and, like the name suggests, are standardized by metric dimensions. With a wide variety of sizes available, Metric O-Rings fill in the gaps left by the standardized AS568 o-ring chart. Metric O-Ring sizing is determined by the o-ring's inside diameter and cross section width. Perfluoroelastomer is also known as FKKM and Perfloro.

Parts resist over 1,800 different chemicals, while offering the high temperature stability of PTFE (327°C). They’re used in aggressive chemical processing, pharmaceutical, oil rcovery, gas recovery, and aerospace applications. The proven, long-term performance of Kalrez® parts can mean less repairs, seal changes, inspections and equipment uptime for greater productivity and yield. For more information, please see: Comparison Properties Chart, PTFE Encapsulated O-rings, Material Shelf Life, and O-ring Groove Design Chart.
Metric O-Rings
Unit of Measure
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Item #

IntegrationID

Type

Material

Cross Reference

Cross Section Width

Durometer

Inside Diameter

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Quantity
21.5 X 3 KALREZ-75 N/A
161832 		N/A Metric Standard O-Ring N/A Perfluoroelastomer N/A N/A 3.00 mm N/A 75 N/A 21.50 mm N/A O-rings are used in the military, automotive,
21.5 X 3 KALREZ-90 N/A
161833 		N/A Metric Standard O-Ring N/A Perfluoroelastomer N/A N/A 3.00 mm N/A 90 N/A 21.50 mm N/A O-rings are used in the military, automotive,
21.5 X 4.5 KALREZ-70 N/A
161834 		N/A Metric Standard O-Ring N/A Perfluoroelastomer N/A N/A 4.50 mm N/A 70 N/A 21.50 mm N/A O-rings are used in the military, automotive,
21.5 X 4.5 KALREZ-75 N/A
161835 		N/A Metric Standard O-Ring N/A Perfluoroelastomer N/A N/A 4.50 mm N/A 75 N/A 21.50 mm N/A O-rings are used in the military, automotive,
21.5 X 4.5 KALREZ-90 N/A
161836 		N/A Metric Standard O-Ring N/A Perfluoroelastomer N/A N/A 4.50 mm N/A 90 N/A 21.50 mm N/A O-rings are used in the military, automotive,
21.59 X 5.33 KALREZ-70 N/A
161837 		N/A Metric Standard O-Ring N/A Perfluoroelastomer N/A 316 N/A 5.33 mm N/A 70 N/A 21.59 mm N/A O-rings are used in the military, automotive,
21.59 X 5.33 KALREZ-75 N/A
161838 		N/A Metric Standard O-Ring N/A Perfluoroelastomer N/A 316 N/A 5.33 mm N/A 75 N/A 21.59 mm N/A O-rings are used in the military, automotive,
21.59 X 5.33 KALREZ-90 N/A
161839 		N/A Metric Standard O-Ring N/A Perfluoroelastomer N/A 316 N/A 5.33 mm N/A 90 N/A 21.59 mm N/A O-rings are used in the military, automotive,
21.6 X 2.4 KALREZ-70 N/A
161840 		N/A Metric Standard O-Ring N/A Perfluoroelastomer N/A N/A 2.40 mm N/A 70 N/A 21.60 mm N/A O-rings are used in the military, automotive,
21.6 X 2.4 KALREZ-75 N/A
161841 		N/A Metric Standard O-Ring N/A Perfluoroelastomer N/A N/A 2.40 mm N/A 75 N/A 21.60 mm N/A O-rings are used in the military, automotive,
21.6 X 2.4 KALREZ-90 N/A
161842 		N/A Metric Standard O-Ring N/A Perfluoroelastomer N/A N/A 2.40 mm N/A 90 N/A 21.60 mm N/A O-rings are used in the military, automotive,
21.7 X 3.5 KALREZ-70 N/A
161843 		N/A Metric Standard O-Ring N/A Perfluoroelastomer N/A P22A N/A 3.50 mm N/A 70 N/A 21.70 mm N/A O-rings are used in the military, automotive,
21.7 X 3.5 KALREZ-75 N/A
161844 		N/A Metric Standard O-Ring N/A Perfluoroelastomer N/A P22A N/A 3.50 mm N/A 75 N/A 21.70 mm N/A O-rings are used in the military, automotive,
21.7 X 3.5 KALREZ-90 N/A
161845 		N/A Metric Standard O-Ring N/A Perfluoroelastomer N/A P22A N/A 3.50 mm N/A 90 N/A 21.70 mm N/A O-rings are used in the military, automotive,
21.8 X 2.4 KALREZ-70 N/A
161846 		N/A Metric Standard O-Ring N/A Perfluoroelastomer N/A P22 N/A 2.40 mm N/A 70 N/A 21.80 mm N/A O-rings are used in the military, automotive,
21.8 X 2.4 KALREZ-75 N/A
161847 		N/A Metric Standard O-Ring N/A Perfluoroelastomer N/A P22 N/A 2.40 mm N/A 75 N/A 21.80 mm N/A O-rings are used in the military, automotive,
21.8 X 2.4 KALREZ-90 N/A
161848 		N/A Metric Standard O-Ring N/A Perfluoroelastomer N/A P22 N/A 2.40 mm N/A 90 N/A 21.80 mm N/A O-rings are used in the military, automotive,
21.82 X 3.53 KALREZ-70 N/A
161849 		N/A Metric Standard O-Ring N/A Perfluoroelastomer N/A 212 N/A 3.53 mm N/A 70 N/A 21.82 mm N/A O-rings are used in the military, automotive,
21.82 X 3.53 KALREZ-75 N/A
161850 		N/A Metric Standard O-Ring N/A Perfluoroelastomer N/A 212 N/A 3.53 mm N/A 75 N/A 21.82 mm N/A O-rings are used in the military, automotive,
21.82 X 3.53 KALREZ-90 N/A
161851 		N/A Metric Standard O-Ring N/A Perfluoroelastomer N/A 212 N/A 3.53 mm N/A 90 N/A 21.82 mm N/A O-rings are used in the military, automotive,
21.89 X 2.62 KALREZ-70 N/A
161852 		N/A Metric Standard O-Ring N/A Perfluoroelastomer N/A 118 N/A 2.62 mm N/A 70 N/A 21.89 mm N/A O-rings are used in the military, automotive,
21.89 X 2.62 KALREZ-75 N/A
161853 		N/A Metric Standard O-Ring N/A Perfluoroelastomer N/A 118 N/A 2.62 mm N/A 75 N/A 21.89 mm N/A O-rings are used in the military, automotive,
21.89 X 2.62 KALREZ-90 N/A
161854 		N/A Metric Standard O-Ring N/A Perfluoroelastomer N/A 118 N/A 2.62 mm N/A 90 N/A 21.89 mm N/A O-rings are used in the military, automotive,
21.9 X 2 KALREZ-70 N/A
161855 		N/A Metric Standard O-Ring N/A Perfluoroelastomer N/A S22.4 N/A 2.00 mm N/A 70 N/A 21.90 mm N/A O-rings are used in the military, automotive,
21.9 X 2 KALREZ-75 N/A
161856 		N/A Metric Standard O-Ring N/A Perfluoroelastomer N/A S22.4 N/A 2.00 mm N/A 75 N/A 21.90 mm N/A O-rings are used in the military, automotive,
Unit of Measure
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