NBR Parker NM304-75 O-Ring, Size: -008
Material: NBR Parker NM304-75 O-Ring
Size: AS568 -008 O-Ring
Part Number: NM304-75-OR-008
Parker Seal® (Parker)
NM304-75
NBR (Nitrile, Buna-N)
75
Shore A
MIL-DTL-25732
Color: Black
Detailed Description
NM304-75-OR-008 is a Black, 75 Shore A, NBR (Nitrile, Buna-N) O-Ring made from Parker Seal® (Parker). Parker Seal® (Parker) NM304-75 is manufactured with the following features & specifications: MIL-DTL-25732. NM304-75-OR-008 is AS568 size -008 O-Ring also referred to as 1.78mm (Cross Sectional Diameter (CS)) x 4.47mm (Inside Diameter (ID)).
Material: NBR Parker NM304-75 O-Ring
Size: AS568 -008, 1.78mm CS X 4.47mm ID (0.070" CS X 0.176" ID)
| Technical Specification | Value |
|---|---|
| Compound Number | NM304-75 |
| Brand | Parker Seal® (Parker) |
| Material | NBR (Nitrile, Buna-N) |
| Color | Black |
| Durometer | 75 Shore A |
| High Temperature | 107 °C / 225 °F |
| Low Temperature | -54 °C / -65 °F |
| Geometry Specifications | |
| Cross Sectional Geometry | O-Ring |
| Size Standard | AS568 |
| Size | -008 |
| Cross Section (CS) | 1.78 mm / 0.070 in |
| Inside Diameter (ID) | 4.47 mm / 0.176 in |
| Other Specifications | |
MIL-DTL-25732 | |
Parker’s NM304-75 is a 75 Shore A black nitrile rubber (NBR) compound qualified to MIL-DTL-25732 for oil-resistant sealing applications requiring dependable mechanical strength and stability. This material provides good abrasion resistance and low compression set, supporting reliable long-term performance in O-rings and gaskets used in static and light dynamic service. With a service temperature range of -65°F to 225°F (-54°C to 107°C), NM304-75 maintains elasticity and sealing force across temperature cycling while performing well in contact with petroleum-based oils and common industrial fluids. Its mid-high durometer offers improved extrusion resistance compared to softer nitrile grades, making it suitable for higher clamp loads.
NM304-75 is commonly specified for military, aerospace-adjacent, and industrial applications where MIL qualification and consistent nitrile performance are required at a cost-effective level. This compound is selected when durability, oil resistance, and compliance are priorities without transitioning to specialty elastomers. Canyon Components offers equivalent NBR materials that match or exceed the performance of Parker NM304-75 for MIL-DTL-25732 compliant O-rings and gaskets across a wide range of sealing applications.
Common relevant keywords:
MIL-DTL-25732 nitrile rubber, 75 Shore A NBR O-rings, military spec nitrile gaskets, oil resistant NBR seals, abrasion resistant nitrile elastomer, low compression set rubber seals, black nitrile sealing material, aerospace nitrile O-rings, Parker NM304-75 equivalent, Datasheet, TDS, Test Report, MTR, MSDS, SDS