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Military Standard MS27595-013 Retainer, Packing
Military Standard MS27595-013 Retainer, Packing
PART #: SGP136483MFR PART #: MS27595-013Our Price: $0.21 (Each)QTY: Add to Cart -
Military Standard MS27595-015 Retainer, Packing
Military Standard MS27595-015 Retainer, Packing
PART #: SGP136485MFR PART #: MS27595-015Our Price: $1.17 (Each)QTY: Add to Cart -
Military Standard MS27595-014 Retainer, Packing
Military Standard MS27595-014 Retainer, Packing
PART #: SGP136484MFR PART #: MS27595-014Our Price: $1.23 (Each)QTY: Add to Cart -
Military Standard MS27595-016 Retainer, Packing
Military Standard MS27595-016 Retainer, Packing
PART #: SGP136486MFR PART #: MS27595-016Our Price: $1.10 (Each)QTY: Add to Cart -
Military Standard MS27595-017 Retainer, Packing
Military Standard MS27595-017 Retainer, Packing
PART #: SGP136487MFR PART #: MS27595-017Our Price: $1.21 (Pack)QTY: Add to Cart -
Military Standard MS27595-018 Retainer, Packing
Military Standard MS27595-018 Retainer, Packing
PART #: SGP136488MFR PART #: MS27595-018Our Price: $1.30 (Pack)QTY: Add to Cart -
Military Standard MS27595-026 Retainer, Packing
Military Standard MS27595-026 Retainer, Packing
PART #: SGP136494MFR PART #: MS27595-026Our Price: $1.54 (Each)QTY: Add to Cart -
Military Standard MS27595-025 Retainer, Packing
Military Standard MS27595-025 Retainer, Packing
PART #: SGP136493MFR PART #: MS27595-025Our Price: $1.15 (Each)QTY: Add to Cart -
Military Standard MS27595-119 Retainer, Packing
Military Standard MS27595-119 Retainer, Packing
PART #: SGP136503MFR PART #: MS27595-119Our Price: $16.67 (Each)QTY: Add to Cart -
Military Standard MS27595-124 Retainer, Packing
Military Standard MS27595-124 Retainer, Packing
PART #: SGP136507MFR PART #: MS27595-124Our Price: $1.69 (Each)QTY: Add to Cart -
Military Standard MS27595-127 Retainer, Packing
Military Standard MS27595-127 Retainer, Packing
PART #: SGP136510MFR PART #: MS27595-127Our Price: $2.13 (Each)QTY: Add to Cart -
Military Standard MS27595-126 Retainer, Packing
Military Standard MS27595-126 Retainer, Packing
PART #: SGP136509MFR PART #: MS27595-126Our Price: $1.86 (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.