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NBR BUR
BUR 165,56X3,00X1,02/1,27 BLACK NBR90 (BS260)
165.56
x
3.00
x
1.02
NBR
90 Sh A
0
330 Units
- 05/04/2024
BUR 165,56X3,00X1,02/1,27 BLACK NBR90 (BS260)
Part number: BUR260IB9491
Weight : 0.5860 gr.
Customs tariff code: 40169300
Country of origin: TH
BUR 165,56X3,00X1,02/1,27 BLACK NBR90 (BS260)
Part number: BUR260IB901801
Weight : 0.5900 gr.
Customs tariff code: 40169300
Country of origin: TW
BUR 165,56X2,18X1,14/1,35 BLACK NBR90 (BS165)
Part number: BUR165IB901801
Weight : 0.7380 gr.
Customs tariff code: 40169300
Country of origin: TW
BUR 165,71X5,99X2,44/2,97 BLACK NBR90 (BS439)
Part number: BUR439IB919002
Weight : 3.2850 gr.
Customs tariff code: 40169300
Country of origin: VN
BUR 165,81X4,65X1,52/1,93 BLACK NBR90 (BS363)
Part number: BUR363IB9491
Weight : 1.3160 gr.
Customs tariff code: 40169300
Country of origin: TH
BUR 171,91X3,00X1,02/1,27 BLACK NBR90 (BS261)
Part number: BUR261IB901801
Weight : 2.6000 gr.
Customs tariff code: 40169300
Country of origin: TW
BUR 171.91X2.18X1.14/1.35 BLACK NBR90 (BS166)
Part number: BUR166IB90XBL
Weight : 2.0000 gr.
Customs tariff code: 40169300
Country of origin: CN
BUR 172,06X5,99X2,44/2,97 BLACK NBR90 (BS440)
Part number: BUR440IB901801
Weight : 3.5380 gr.
Customs tariff code: 40169300
Country of origin: TW
BUR 172,16X4,65X1,52/1,93 NBR90 NEGRO (BS364)
Part number: BUR364IB901801
Weight : 6.0000 gr.
Customs tariff code: 40169300
Country of origin: TW
BUR 178,26X3,00X1,02/1,27 BLACK NBR90 (BS262)
Part number: BUR262IB901801
Weight : 2.6000 gr.
Customs tariff code: 40169300
Country of origin: TW
BUR 178.26X2.18X1.14/1.35 BLACK NBR90 (BS167)
Part number: BUR167IB90XBL
Weight : 2.0000 gr.
Customs tariff code: 40169300
Country of origin: CN
BUR 178,41X5,99X2,44/2,97 BLACK NBR90 (BS441)
Part number: BUR441IB901801
Weight : 16.0000 gr.
Customs tariff code: 40169300
Country of origin: TW
technical data
| Back-Up Rings | Profile | Material | Hardness | Temperature |
| BUR |  | NBR | 90 SH A | -20 to +100/+120 ºC |
| SPIRAL BUR |  | PTFE VIRGEN | -150 to +260 ºC |
QUICK LINKS
Rings that improve O-Rings performance
Back-up Rings are parts fitted together with an O-Ring. They do not properly have a sealing function but are rather dedicated to improving the performance of said O-Ring. Depending on the application and the housing, one or two BUR can be fitted around the OR allowing its use in static or dynamic systems, in reciprocating or rotating movements and achieving the use of a wide range of OR hardnesses.
Its profile is pretty basic since its most simple version is a rectangular section washer. However, the most standard profile is the concave cross-section washer that allows the O-Ring to be seated, improving the anti-extrusion effect.
The standard material that we usually stock is NBR90 although it can also be manufactured in FPM, PTFE, POM, PU,… on request.
Another very efficient profile in reciprocating applications is the spiral BUR made of virgin PTFE. These are two spiral windings cut at an angle at the end that can be fitted with an FPM OR when the working temperature requires it. Finally, we can highlight that BUR can be cut with different angles, which allows their assembly in closed housings.
To facilitate their identification, although obviously both the concave section rings in NBR90 and the spiral PTFE rings have very standard sizes in their respective ranges, the BS number of the AS-568 range is usually the easiest way to tie in a BUR with an OR. For example, instead of ordering a BUR which sizes are 32.16 × 3.00 × 1.00 / 1.27, it is easier to refer to the BUR218 as it will be fitted with a BS218 O-Ring (31,34×3.53).
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What are Backup Rings (BUR)?
Published : 07/08/2022 | Categories : Back-Up RingsBUR, the O-ring's protector BURs are special rings that provide extra support for O-rings with which they are fitted. Their main purpose is to provide increased extrusion resistance and [...]