Parker’s NM507-90 is a ninety-durometer, low temperature nitrile elastomer formulated to have robust mechanical properties for resisting O-ring extrusion in tube fitting applications. NM507 is often used when the application requires seals in accordance with AS28778 or MS28778 for boss fittings.
NM507 meets the challenging AMS-P-5510 SAE specification which requires a tight balance of low temperature flexibility with Mil-PRF-5606 hydraulic oil compatibility. Low temperature flexibility can be measured by Temperature Retraction. NM507 has a TR-10 value of -46° in the original condition. After a week long oil immersion at 158°F, the measured TR-10 is -43°F.
Many low temperature nitrile materials will leach plasticizer, resulting in a hardened seal that has shrunk in size. However, NM507 has excellent compatibility with Mil-PRF-5606, maintaining the hardness and having a volume change of +3% after aging at 158°F.
An all around robust seal material, NM507 seals effectively in both hot air and oily conditions. In 158°F dry air, the material retains its physical properties. Maintaining resiliency up to 160°F, the material exceeds the week long compression set requirement at 22%. In oil such as Mil-PRF-6083, the material will not corrode or adhere to Aluminum Alloys or Stainless Steel.
Formulated prior to 1961 for the original Mil-P-5510 specification, NM507 has been performing in aerospace fitting applications for decades, and continues to be available today. Contact your Authorized Parker Distributor to request NM507 in AS568 sizes certified to AMS-P-83461, AS28778 or in custom O-ring sizes as needed. NM507 can also be extruded and precision cut for square cross section O-rings, or as cord stock in a variety of geometries.
Specifications
NM507-90 Extrusion Resistant Nitrile O-Ring Specifications
- For Fluid Type: Oil
- Inside Diameter: 0.029 to 25.940 inch
- Industry: Aerospace
- Durometer: 90 Shore A
- Maximum Operating Temperature: 180 °F
- Thermal Application Type: Low Temperature (<-30°F)
- Minimum Operating Temperature: -65 °F
- Color: Black
- Polymer Material Options: Nitrile Butadiene Rubber (NBR, XNBR)
- Internally Lubricated: No
- Width: 0.04 to 0.275 inch
- Region of Origin: North America
- Trade Name: Buna, Buna N, Buna 90
- Specifications Met: MIL/Aero, AMS-P-5510, MIL-P-5510C, MS28778
Benefits
NM507-90 Extrusion Resistant Nitrile O-Ring Benefits to Aerospace Specs
- O-Rings on straight-threaded, flared-tube connection fittings assembled in AS4395 & AS5202 bosses in accordance with MS21344
- Systems containing air or hydraulic oil conforming to MIL-PRF-5606
- Service temperature range of -65° to 160°F (-54° to 71°C)
- O-Ring part numbers designated MS28778-xxx where xxx indicates size
- QPL listed material in accordance with AMS-P-5510
- O-Rings for use in aircraft type I hydraulic systems to seal standard fitting of the AS4395 & AS5202 bosses as indicated in MS21344
Q & A
NM507-90 Extrusion Resistant Nitrile O-Ring Q & A
Per Parker's compound datasheet:
- Specific Gravity: ~1.29 (ASTM D297; spec 1.25–1.45)
- Hardness: 86 Shore A (ASTM D2240; spec 85–95)
- Tensile Strength: 1774 psi (ASTM D1414; spec ≥1450 psi)
- Ultimate Elongation: Minimum 80%; actual approx. 107% (ASTM D1414)
- Low-temperature Retraction (TR-10): −50 °F vs. max −45 °F (ASTM D1329)
These properties showcase strong mechanical resilience and cold-temperature performance Additionally, corrosion and adhesion testing passed across multiple aluminum and stainless-steel alloys It also withstands dry heat exposure (70 °C for 168 h) with minimal property changes and shows acceptable compression set and oil resistance in Mil-PRF-5606 hydraulic fluid.
Downloads
NM507-90 Extrusion Resistant Nitrile O-Ring Downloads
Parker NM507-90 Extrusion Resistant Nitrile O-Ring Datasheet
Parker NM507-90 Extrusion Resistant Nitrile O-Ring Compound Datasheet
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