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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
308 X 3.5 KALREZ-75 N/A
164169 		N/A Metric Standard O-Ring N/A Perfluoroelastomer N/A N/A 3.50 mm N/A 75 N/A 308.00 mm N/A O-rings are used in the military, automotive,
308 X 3.5 KALREZ-90 N/A
164170 		N/A Metric Standard O-Ring N/A Perfluoroelastomer N/A N/A 3.50 mm N/A 90 N/A 308.00 mm N/A O-rings are used in the military, automotive,
308 X 4 KALREZ-70 N/A
164171 		N/A Metric Standard O-Ring N/A Perfluoroelastomer N/A N/A 4.00 mm N/A 70 N/A 308.00 mm N/A O-rings are used in the military, automotive,
308 X 4 KALREZ-75 N/A
164172 		N/A Metric Standard O-Ring N/A Perfluoroelastomer N/A N/A 4.00 mm N/A 75 N/A 308.00 mm N/A O-rings are used in the military, automotive,
308 X 4 KALREZ-90 N/A
164173 		N/A Metric Standard O-Ring N/A Perfluoroelastomer N/A N/A 4.00 mm N/A 90 N/A 308.00 mm N/A O-rings are used in the military, automotive,
308 X 5 KALREZ-70 N/A
164174 		N/A Metric Standard O-Ring N/A Perfluoroelastomer N/A N/A 5.00 mm N/A 70 N/A 308.00 mm N/A O-rings are used in the military, automotive,
308 X 5 KALREZ-75 N/A
164175 		N/A Metric Standard O-Ring N/A Perfluoroelastomer N/A N/A 5.00 mm N/A 75 N/A 308.00 mm N/A O-rings are used in the military, automotive,
308 X 5 KALREZ-90 N/A
164176 		N/A Metric Standard O-Ring N/A Perfluoroelastomer N/A N/A 5.00 mm N/A 90 N/A 308.00 mm N/A O-rings are used in the military, automotive,
309 X 3.5 KALREZ-70 N/A
164177 		N/A Metric Standard O-Ring N/A Perfluoroelastomer N/A N/A 3.50 mm N/A 70 N/A 309.00 mm N/A O-rings are used in the military, automotive,
309 X 3.5 KALREZ-75 N/A
164178 		N/A Metric Standard O-Ring N/A Perfluoroelastomer N/A N/A 3.50 mm N/A 75 N/A 309.00 mm N/A O-rings are used in the military, automotive,
309 X 3.5 KALREZ-90 N/A
164179 		N/A Metric Standard O-Ring N/A Perfluoroelastomer N/A N/A 3.50 mm N/A 90 N/A 309.00 mm N/A O-rings are used in the military, automotive,
309 X 4 KALREZ-70 N/A
164180 		N/A Metric Standard O-Ring N/A Perfluoroelastomer N/A N/A 4.00 mm N/A 70 N/A 309.00 mm N/A O-rings are used in the military, automotive,
309 X 4 KALREZ-75 N/A
164181 		N/A Metric Standard O-Ring N/A Perfluoroelastomer N/A N/A 4.00 mm N/A 75 N/A 309.00 mm N/A O-rings are used in the military, automotive,
309 X 4 KALREZ-90 N/A
164182 		N/A Metric Standard O-Ring N/A Perfluoroelastomer N/A N/A 4.00 mm N/A 90 N/A 309.00 mm N/A O-rings are used in the military, automotive,
309 X 5 KALREZ-70 N/A
164183 		N/A Metric Standard O-Ring N/A Perfluoroelastomer N/A N/A 5.00 mm N/A 70 N/A 309.00 mm N/A O-rings are used in the military, automotive,
309 X 5 KALREZ-75 N/A
164184 		N/A Metric Standard O-Ring N/A Perfluoroelastomer N/A N/A 5.00 mm N/A 75 N/A 309.00 mm N/A O-rings are used in the military, automotive,
309 X 5 KALREZ-90 N/A
164185 		N/A Metric Standard O-Ring N/A Perfluoroelastomer N/A N/A 5.00 mm N/A 90 N/A 309.00 mm N/A O-rings are used in the military, automotive,
31 X 1.5 KALREZ-70 N/A
164186 		N/A Metric Standard O-Ring N/A Perfluoroelastomer N/A N/A 1.50 mm N/A 70 N/A 31.00 mm N/A O-rings are used in the military, automotive,
31 X 1.5 KALREZ-75 N/A
164187 		N/A Metric Standard O-Ring N/A Perfluoroelastomer N/A N/A 1.50 mm N/A 75 N/A 31.00 mm N/A O-rings are used in the military, automotive,
31 X 1.5 KALREZ-90 N/A
164188 		N/A Metric Standard O-Ring N/A Perfluoroelastomer N/A N/A 1.50 mm N/A 90 N/A 31.00 mm N/A O-rings are used in the military, automotive,
31 X 2 KALREZ-70 N/A
164189 		N/A Metric Standard O-Ring N/A Perfluoroelastomer N/A S31.5 N/A 2.00 mm N/A 70 N/A 31.00 mm N/A O-rings are used in the military, automotive,
31 X 2 KALREZ-75 N/A
164190 		N/A Metric Standard O-Ring N/A Perfluoroelastomer N/A S31.5 N/A 2.00 mm N/A 75 N/A 31.00 mm N/A O-rings are used in the military, automotive,
31 X 2 KALREZ-90 N/A
164191 		N/A Metric Standard O-Ring N/A Perfluoroelastomer N/A S31.5 N/A 2.00 mm N/A 90 N/A 31.00 mm N/A O-rings are used in the military, automotive,
31 X 2.5 KALREZ-70 N/A
164192 		N/A Metric Standard O-Ring N/A Perfluoroelastomer N/A N/A 2.50 mm N/A 70 N/A 31.00 mm N/A O-rings are used in the military, automotive,
31 X 2.5 KALREZ-75 N/A
164193 		N/A Metric Standard O-Ring N/A Perfluoroelastomer N/A N/A 2.50 mm N/A 75 N/A 31.00 mm N/A O-rings are used in the military, automotive,
Unit of Measure
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