Aerospace and Military O-Rings and Seals

Aerospace & Military O-ring & Seal Materials:

Engineered Seal Products is a proud QPL supplier of MIL-Spec and AMS seals. Our expertise and vast range of material offerings serve applications in all areas of the aerospace and military industry.

Typical applications include gas turbine engines, hydraulic systems, fuel systems, braking and landing gear systems, and even system on the space shuttle.

All aerospace products are manufactured at facilities with TS 16949, QS9001, and AS9100 certification.

• AMS – Aerospace Material Specification
• AN – Army / Navy
• ASTM – American Society for Testing and Materials
• M – Military
• MS – Military Standard
• NAS – National Aerospace Standard
• SAE – Society of Automotive Engineers

Military Specification O-Rings need only NSN (National Stock Number) or the Military specification Prefix, plus the AS568 dash number (size). No other description is needed to assure exact conformance to the specification. Certification and cure dates are automatically sent when required.

AMS-P83461 - This specification covers O-ring packings for use with petroleum based hydraulic fluids conforming to MIL-H-5606 and MIL-H-83282 over the temperature range of -65° to 275°F (-54° to 135°C). This material gives improved high temperature performance over materials conforming to MIL-P-25732.

MIL-P-25732 - This specification covers O-ring packings for use with petroleum based hydraulic fluids conforming to MIL-H-5606 and MIL-H-83282 over the temperature range of -65 Deg. to 275 Deg. F (-54 Deg. to 135 Deg. C).

AMS-P-5315 - This specification covers an acrylonitrile-butadiene (NBR) rubber in the manufacture of molded seals. These products have been used typically at temperatures from -65 °F (-54 °C) to +180 °F (+82 °C). where resistance to fuel is required, but usage is not limited to such applications. Each application should be considered individually.

AMS-R-7362 - This specification covers two types of synthetic rubber for use where resistance to diester synthetic oils is required.

AMS7272 - These products have been used typically as sealing rings in contact with diester synthetic lubricants in service up 275 °F (135 °C), but usage is not limited to such applications. These products may not be suitable for use in high temperature stabilized, "HTS", engine oils (those conforming to MIL-PRF-23699 Class HTS, MIL-PRF-7808 Grade 4 and AS5780 Class HPC). The cross-section of such rings is usually not over 0.275 inch (6.98 mm) in diameter or thickness.

AMS-P-5510 - O-rings covered by this specification are intended for use in aircraft Type I hydraulic systems (-65 to 160 °F) to seal standard fitting of the AS4395 and AS5202 bosses as indicated in MS21344.

AMS 7270 - For use in aircraft fuels, both piston (gasoline) and jet (jet fuels) engines conforming to

AMS7271 - This material type has shown to exhibit resistance to both aromatic as well as non-aromatic fuels and has a typical service temperature range of -67 to 212 °F (-55 to 100 °C) with intermittent usage up to 257 °F (125 °C). The service temperature range of the material is a general temperature range, but the presence of particular fluids and design requirements may modify this range. Each application should be considered separately. It is the responsibility of the user to determine that this specification is appropriate for the environments (temperature range, fluids exposure, etc.) in which it is sought to be used.

AMS3220 - Primarily for packing and sealing joints which come in contact with aircraft fuels, hot petroleum-base lubricating oils, and ethylene glycol from -20 to +220 °F (-29 to +104 °C) This material has fair resistance to all fluids listed. Where better resistance to a particular fluid is required, use the AMS for material compounded specifically for good resistance to that fluid.

AMS3208 - This specification covers a chloroprene (CR) rubber in the form of sheet, strip, tubing, extrusions, and molded shapes. These products have been typically used for parts requiring resistance to weather, such as window channels, bumper pads, chafing strips, and seals, for use from -40 to +100 °C (-40 to +212 °F), but usage is not limited to such applications. Each application, however, should be considered individually.

AMS3209 - This specification covers a chloroprene (CR) rubber in the form of sheet, strip, tubing, extrusions, and molded shapes. These products have been used typically for parts requiring resistance to weather, such as window channels, bumper pads, chafing strips, and seals, for use from -40 to + 100 °C (-40 to +212 °F), but usage is not limited to such applications. Each application should be considered individually.

AMS3241 - This specification covers a chloroprene (CR) rubber in the form of sheet, strip, tubing, extrusions, and molded shapes. These products have been used typically for parts, such as window channels, bumper pads, chafing strips, and seals, requiring resistance to weather and for use from -40 to +212 °F (-40 to +100 °C), but usage is not limited to such applications.

AMS3238 - This specification covers a butyl (IIR) rubber in the form of sheet, strip, tubing, extrusions, and molded shapes. This product has been used typically for parts such as grommets requiring resistance to phosphate esters or low permeability to gases, but usage is not limited to such applications. Not suitable for use in contact with petroleum-based fluids due to excessive swell.

AMS3302 - This specification covers a silicone (MQ/VMQ) elastomer that can be used to manufacture product in the form of sheet, strip, tubing, extrusions, and molded shapes. This specification should not be used for molded rings, compression seals, O-ring cord, and molded in place gaskets for aeronautical and aerospace applications without complete consideration of the end use prior to the selection of this material. This material type has resistance to deterioration by weathering and petroleum based lubrication oil, but usage is not limited to such applications. This material type has a typical service temperature range of -85 to +400 °F (-65 to +204 °C) and remains flexible over the temperature range noted. The service temperature range of the material is a general temperature range, but the presence of particular fluids and specific design requirements may modify this range. Each application should be considered separately. It is the responsibility of the user to determine that this specification is appropriate for the environments (temperature range, fluids exposure, etc.) in which it is sought to be used. These products are not normally suitable for use in contact with gasoline or aromatic fuels and low-aniline-point petroleum-based fluids due to excessive swelling of the elastomer.

AMS3303 - This specification covers a silicone (MQ/VMQ) elastomer that can be used to manufacture product in the form of sheet, strip, tubing, extrusions, and molded shapes. This specification should not be used for molded rings, compression seals, O-ring cord, and molded in place gaskets for aeronautical and aerospace applications without complete consideration of the end use prior to the selection of this material. This material type has resistance to deterioration by weathering and petroleum based lubrication oil, but usage is not limited to such applications. This Material Type has a typical service temperature range of -85 to +400 °F (-65 to +205 °C) and remains flexible over the temperature range noted. The service temperature range of the material is a general temperature range, but the presence of particular fluids and specific design requirements may modify this range. Each application should be considered separately. It is the responsibility of the user to determine that this specification is appropriate for the environments (temperature range, fluids exposure, etc.) in which it is sought to be used. These products are not normally suitable for use in contact with gasoline or aromatic fuels and low-aniline-point petroleum-based fluids due to excessive swelling of the elastomer.

Sources: MIL, MS, AN, ZZ-R, and A-A documents can be viewed at http://assist.daps.dla.mil by clicking on Quick Search and entering the document number. AMS, AS, and MA documents are copyright protected and must be purchased from SAE (www.sae.org). NAS documents are copyright protected and must be purchased from AIAA (www.aia-aerospace.org)