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National Aerospace Standard NAS1523C6R Packing with Retainer
National Aerospace Standard NAS1523C6R Packing with Retainer
PART #: SGP140743MFR PART #: NAS1523C6ROur Price: $4.08 (Each)QTY: Add to Cart -
National Aerospace Standard NAS1523C7E Packing with Retainer
National Aerospace Standard NAS1523C7E Packing with Retainer
PART #: SGP140745MFR PART #: NAS1523C7EOur Price: $6.25 (Each)QTY: Add to Cart -
National Aerospace Standard NAS1523C8N Packing with Retainer
National Aerospace Standard NAS1523C8N Packing with Retainer
PART #: SGP140749MFR PART #: NAS1523C8NOur Price: $13.08 (Each)QTY: Add to Cart -
National Aerospace Standard NAS1523C7R Packing with Retainer
National Aerospace Standard NAS1523C7R Packing with Retainer
PART #: SGP140747MFR PART #: NAS1523C7ROur Price: $9.41 (Each)QTY: Add to Cart -
National Aerospace Standard NAS1523C8R Packing with Retainer
National Aerospace Standard NAS1523C8R Packing with Retainer
PART #: SGP140750MFR PART #: NAS1523C8ROur Price: $6.67 (Each)QTY: Add to Cart -
National Aerospace Standard NAS1523C9Y Packing with Retainer
National Aerospace Standard NAS1523C9Y Packing with Retainer
PART #: SGP140753MFR PART #: NAS1523C9YOur Price: $8.74 (Each)QTY: Add to Cart -
National Aerospace Standard NAS1523-3W Packing with Retainer
National Aerospace Standard NAS1523-3W Packing with Retainer
PART #: SGP140646MFR PART #: NAS1523-3WOur Price: $3.03 (Each)QTY: Add to Cart -
National Aerospace Standard NAS1523-7Y Packing with Retainer
National Aerospace Standard NAS1523-7Y Packing with Retainer
PART #: SGP140660MFR PART #: NAS1523-7YOur Price: $22.52 (Each)QTY: Add to Cart -
National Aerospace Standard NAS1523-06E Packing with Retainer
National Aerospace Standard NAS1523-06E Packing with Retainer
PART #: SGP140637MFR PART #: NAS1523-06EOur Price: $21.39 (Each)QTY: Add to Cart -
National Aerospace Standard NAS1523-08F Packing with Retainer
National Aerospace Standard NAS1523-08F Packing with Retainer
PART #: SGP140638MFR PART #: NAS1523-08FOur Price: $1.85 (Each)QTY: Add to Cart -
National Aerospace Standard NAS1523-3Y Packing with Retainer
National Aerospace Standard NAS1523-3Y Packing with Retainer
PART #: SGP140647MFR PART #: NAS1523-3YOur Price: $2.12 (Each)QTY: Add to Cart -
National Aerospace Standard NAS1523AA12E Packing with Retainer
National Aerospace Standard NAS1523AA12E Packing with Retainer
PART #: SGP140672MFR PART #: NAS1523AA12EOur Price: $21.48 (Each)QTY: Add to Cart
Ask any Skygeek and they will tell you a back-up ring functions on the principle of "everything needs support." As its name implies, it is a sturdy ring that "backs-up" (usually a rubber) seal. It is designed specifically to hold or maintain this seal in its proper position.
In many assemblies, joints require a seal. This is done so as to prevent the leakage of fluid or gas. O-rings are often used as a seal. However, due to extreme pressures inherent in aviation, these seals may extrude or lose their place and thus compromise their intended use. Back-up rings prevent extrusion and thus are used in conjunction with O-rings.
Back-up rings, like their O-ring counterparts, are usually made of elastic polymers, the most common being nitrile butadiene rubber (NBR) and polytetrafluoroethylene (PTFE or Teflon). Like other materials, elastomers are often given a hardness rating (durometer). This identifies a material's resistive strength, especially when dealing with pressures and other external forces. For instance, when viewing a back-up ring, you might find a 70 or 75A in its name; these numbers refer to its durometer.
Besides material, back-up rings can be classified by type, three variations include: spiral, endless, and endless split. A spiral back-up ring is the most frequently used because of its ability to efficiently self-adjust to diametrical tolerances. Endless back-up rings are applied whenever problems occur with the rotation of screwed endcaps that may cause a spiral type to unwind. The endless split back-up ring is identical to the endless back-up ring, the only difference is it is split at a 30-degree angle; this facilitates assembly for some applications.
Finally, back-up rings conform to several military specifications and Skygeek carries them including: MS27595, M8791, and MS9058. Our inventory is growing so check in from time to time. Otherwise, click on the specific series of back-up rings and make sure your seals are supported.