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British Standard O-Rings are very similar to Standard O-Rings in the fact that they are both standardized imperically. The British Standard however, incorporates some extended sizes in the 1/4" nominal cross section group for an even broader application range. British Standard O-Rings serve a variety of industries including aerospace, paint, food, and chemical transport. 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.
BS O-Rings
Unit of Measure
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Item #

IntegrationID

Type

Material

Cross Section Width

Durometer

Inside Diameter

CSW Tolerance

BS Number

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O-Ring Industries

Quantity
BS255 KALREZ-90 N/A
188634 		N/A BS Standard O-Ring N/A Perfluoroelastomer N/A 0.139 in3.53 mm N/A 90 N/A 5.759 in146.28 mm N/A 0.004 in0.10 mm N/A -255 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS254 KALREZ-90 N/A
188635 		N/A BS Standard O-Ring N/A Perfluoroelastomer N/A 0.139 in3.53 mm N/A 90 N/A 5.484 in139.29 mm N/A 0.004 in0.10 mm N/A -254 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS253 KALREZ-90 N/A
188636 		N/A BS Standard O-Ring N/A Perfluoroelastomer N/A 0.139 in3.53 mm N/A 90 N/A 5.359 in136.12 mm N/A 0.004 in0.10 mm N/A -253 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS252 KALREZ-90 N/A
188637 		N/A BS Standard O-Ring N/A Perfluoroelastomer N/A 0.139 in3.53 mm N/A 90 N/A 5.234 in132.94 mm N/A 0.004 in0.10 mm N/A -252 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS251 KALREZ-90 N/A
188638 		N/A BS Standard O-Ring N/A Perfluoroelastomer N/A 0.139 in3.53 mm N/A 90 N/A 5.109 in129.77 mm N/A 0.004 in0.10 mm N/A -251 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS250 KALREZ-90 N/A
188639 		N/A BS Standard O-Ring N/A Perfluoroelastomer N/A 0.139 in3.53 mm N/A 90 N/A 4.984 in126.59 mm N/A 0.004 in0.10 mm N/A -250 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS249 KALREZ-90 N/A
188640 		N/A BS Standard O-Ring N/A Perfluoroelastomer N/A 0.139 in3.53 mm N/A 90 N/A 4.859 in123.42 mm N/A 0.004 in0.10 mm N/A -249 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS248 KALREZ-90 N/A
188641 		N/A BS Standard O-Ring N/A Perfluoroelastomer N/A 0.139 in3.53 mm N/A 90 N/A 4.734 in120.24 mm N/A 0.004 in0.10 mm N/A -248 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS247 KALREZ-90 N/A
188642 		N/A BS Standard O-Ring N/A Perfluoroelastomer N/A 0.139 in3.53 mm N/A 90 N/A 4.759 in120.88 mm N/A 0.004 in0.10 mm N/A -247 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS246 KALREZ-90 N/A
188643 		N/A BS Standard O-Ring N/A Perfluoroelastomer N/A 0.139 in3.53 mm N/A 90 N/A 4.484 in113.89 mm N/A 0.004 in0.10 mm N/A -246 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS245 KALREZ-90 N/A
188644 		N/A BS Standard O-Ring N/A Perfluoroelastomer N/A 0.139 in3.53 mm N/A 90 N/A 4.359 in110.72 mm N/A 0.004 in0.10 mm N/A -245 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS244 KALREZ-90 N/A
188645 		N/A BS Standard O-Ring N/A Perfluoroelastomer N/A 0.139 in3.53 mm N/A 90 N/A 4.234 in107.54 mm N/A 0.004 in0.10 mm N/A -244 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS243 KALREZ-90 N/A
188646 		N/A BS Standard O-Ring N/A Perfluoroelastomer N/A 0.139 in3.53 mm N/A 90 N/A 4.109 in104.37 mm N/A 0.004 in0.10 mm N/A -243 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS242 KALREZ-90 N/A
188647 		N/A BS Standard O-Ring N/A Perfluoroelastomer N/A 0.139 in3.53 mm N/A 90 N/A 3.984 in101.19 mm N/A 0.004 in0.10 mm N/A -242 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS241 KALREZ-90 N/A
188648 		N/A BS Standard O-Ring N/A Perfluoroelastomer N/A 0.139 in3.53 mm N/A 90 N/A 3.859 in98.02 mm N/A 0.004 in0.10 mm N/A -241 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS240 KALREZ-90 N/A
188649 		N/A BS Standard O-Ring N/A Perfluoroelastomer N/A 0.139 in3.53 mm N/A 90 N/A 3.734 in94.84 mm N/A 0.004 in0.10 mm N/A -240 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS239 KALREZ-90 N/A
188650 		N/A BS Standard O-Ring N/A Perfluoroelastomer N/A 0.139 in3.53 mm N/A 90 N/A 3.759 in95.48 mm N/A 0.004 in0.10 mm N/A -239 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS238 KALREZ-90 N/A
188651 		N/A BS Standard O-Ring N/A Perfluoroelastomer N/A 0.139 in3.53 mm N/A 90 N/A 3.484 in88.49 mm N/A 0.004 in0.10 mm N/A -238 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS237 KALREZ-90 N/A
188652 		N/A BS Standard O-Ring N/A Perfluoroelastomer N/A 0.139 in3.53 mm N/A 90 N/A 3.359 in85.32 mm N/A 0.004 in0.10 mm N/A -237 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS236 KALREZ-90 N/A
188653 		N/A BS Standard O-Ring N/A Perfluoroelastomer N/A 0.139 in3.53 mm N/A 90 N/A 3.234 in82.14 mm N/A 0.004 in0.10 mm N/A -236 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS235 KALREZ-90 N/A
188654 		N/A BS Standard O-Ring N/A Perfluoroelastomer N/A 0.139 in3.53 mm N/A 90 N/A 3.109 in78.97 mm N/A 0.004 in0.10 mm N/A -235 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS234 KALREZ-90 N/A
188655 		N/A BS Standard O-Ring N/A Perfluoroelastomer N/A 0.139 in3.53 mm N/A 90 N/A 2.984 in75.79 mm N/A 0.004 in0.10 mm N/A -234 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS233 KALREZ-90 N/A
188656 		N/A BS Standard O-Ring N/A Perfluoroelastomer N/A 0.139 in3.53 mm N/A 90 N/A 2.859 in72.62 mm N/A 0.004 in0.10 mm N/A -233 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS232 KALREZ-90 N/A
188657 		N/A BS Standard O-Ring N/A Perfluoroelastomer N/A 0.139 in3.53 mm N/A 90 N/A 2.734 in69.44 mm N/A 0.004 in0.10 mm N/A -232 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS231 KALREZ-90 N/A
188658 		N/A BS Standard O-Ring N/A Perfluoroelastomer N/A 0.139 in3.53 mm N/A 90 N/A 2.759 in70.08 mm N/A 0.004 in0.10 mm N/A -231 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
Unit of Measure
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