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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
BS280 KALREZ-90 N/A
188609 		N/A BS Standard O-Ring N/A Perfluoroelastomer N/A 0.139 in3.53 mm N/A 90 N/A 13.984 in355.19 mm N/A 0.004 in0.10 mm N/A -280 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS279 KALREZ-90 N/A
188610 		N/A BS Standard O-Ring N/A Perfluoroelastomer N/A 0.139 in3.53 mm N/A 90 N/A 12.984 in329.79 mm N/A 0.004 in0.10 mm N/A -279 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS278 KALREZ-90 N/A
188611 		N/A BS Standard O-Ring N/A Perfluoroelastomer N/A 0.139 in3.53 mm N/A 90 N/A 11.984 in304.39 mm N/A 0.004 in0.10 mm N/A -278 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS277 KALREZ-90 N/A
188612 		N/A BS Standard O-Ring N/A Perfluoroelastomer N/A 0.139 in3.53 mm N/A 90 N/A 11.484 in291.69 mm N/A 0.004 in0.10 mm N/A -277 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS276 KALREZ-90 N/A
188613 		N/A BS Standard O-Ring N/A Perfluoroelastomer N/A 0.139 in3.53 mm N/A 90 N/A 10.984 in278.99 mm N/A 0.004 in0.10 mm N/A -276 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS275 KALREZ-90 N/A
188614 		N/A BS Standard O-Ring N/A Perfluoroelastomer N/A 0.139 in3.53 mm N/A 90 N/A 10.484 in266.29 mm N/A 0.004 in0.10 mm N/A -275 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS274 KALREZ-90 N/A
188615 		N/A BS Standard O-Ring N/A Perfluoroelastomer N/A 0.139 in3.53 mm N/A 90 N/A 9.984 in253.59 mm N/A 0.004 in0.10 mm N/A -274 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS273 KALREZ-90 N/A
188616 		N/A BS Standard O-Ring N/A Perfluoroelastomer N/A 0.139 in3.53 mm N/A 90 N/A 9.734 in247.24 mm N/A 0.004 in0.10 mm N/A -273 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS272 KALREZ-90 N/A
188617 		N/A BS Standard O-Ring N/A Perfluoroelastomer N/A 0.139 in3.53 mm N/A 90 N/A 9.484 in240.89 mm N/A 0.004 in0.10 mm N/A -272 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS271 KALREZ-90 N/A
188618 		N/A BS Standard O-Ring N/A Perfluoroelastomer N/A 0.139 in3.53 mm N/A 90 N/A 9.234 in234.54 mm N/A 0.004 in0.10 mm N/A -271 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS270 KALREZ-90 N/A
188619 		N/A BS Standard O-Ring N/A Perfluoroelastomer N/A 0.139 in3.53 mm N/A 90 N/A 8.984 in228.19 mm N/A 0.004 in0.10 mm N/A -270 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS269 KALREZ-90 N/A
188620 		N/A BS Standard O-Ring N/A Perfluoroelastomer N/A 0.139 in3.53 mm N/A 90 N/A 8.734 in221.84 mm N/A 0.004 in0.10 mm N/A -269 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS268 KALREZ-90 N/A
188621 		N/A BS Standard O-Ring N/A Perfluoroelastomer N/A 0.139 in3.53 mm N/A 90 N/A 8.484 in215.49 mm N/A 0.004 in0.10 mm N/A -268 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS267 KALREZ-90 N/A
188622 		N/A BS Standard O-Ring N/A Perfluoroelastomer N/A 0.139 in3.53 mm N/A 90 N/A 8.234 in209.14 mm N/A 0.004 in0.10 mm N/A -267 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS266 KALREZ-90 N/A
188623 		N/A BS Standard O-Ring N/A Perfluoroelastomer N/A 0.139 in3.53 mm N/A 90 N/A 7.984 in202.79 mm N/A 0.004 in0.10 mm N/A -266 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS265 KALREZ-90 N/A
188624 		N/A BS Standard O-Ring N/A Perfluoroelastomer N/A 0.139 in3.53 mm N/A 90 N/A 7.734 in196.44 mm N/A 0.004 in0.10 mm N/A -265 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS264 KALREZ-90 N/A
188625 		N/A BS Standard O-Ring N/A Perfluoroelastomer N/A 0.139 in3.53 mm N/A 90 N/A 7.484 in190.09 mm N/A 0.004 in0.10 mm N/A -264 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS263 KALREZ-90 N/A
188626 		N/A BS Standard O-Ring N/A Perfluoroelastomer N/A 0.139 in3.53 mm N/A 90 N/A 7.234 in183.74 mm N/A 0.004 in0.10 mm N/A -263 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS262 KALREZ-90 N/A
188627 		N/A BS Standard O-Ring N/A Perfluoroelastomer N/A 0.139 in3.53 mm N/A 90 N/A 6.984 in177.39 mm N/A 0.004 in0.10 mm N/A -262 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS261 KALREZ-90 N/A
188628 		N/A BS Standard O-Ring N/A Perfluoroelastomer N/A 0.139 in3.53 mm N/A 90 N/A 6.734 in171.04 mm N/A 0.004 in0.10 mm N/A -261 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS275 KALREZ-90 N/A
188629 		N/A BS Standard O-Ring N/A Perfluoroelastomer N/A 0.139 in3.53 mm N/A 90 N/A 6.484 in164.69 mm N/A 0.004 in0.10 mm N/A -275 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS259 KALREZ-90 N/A
188630 		N/A BS Standard O-Ring N/A Perfluoroelastomer N/A 0.139 in3.53 mm N/A 90 N/A 6.234 in158.34 mm N/A 0.004 in0.10 mm N/A -259 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS258 KALREZ-90 N/A
188631 		N/A BS Standard O-Ring N/A Perfluoroelastomer N/A 0.139 in3.53 mm N/A 90 N/A 5.984 in151.99 mm N/A 0.004 in0.10 mm N/A -258 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS257 KALREZ-90 N/A
188632 		N/A BS Standard O-Ring N/A Perfluoroelastomer N/A 0.139 in3.53 mm N/A 90 N/A 5.859 in148.82 mm N/A 0.004 in0.10 mm N/A -257 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS256 KALREZ-90 N/A
188633 		N/A BS Standard O-Ring N/A Perfluoroelastomer N/A 0.139 in3.53 mm N/A 90 N/A 5.734 in145.64 mm N/A 0.004 in0.10 mm N/A -256 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
Unit of Measure
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