
Image shown is representative and may differ from the actual product in size, proportions, and color shade
0.070 in
(1.78 mm)
2.864 in
(72.75 mm)

NBR NB70BK31 X-Ring, Size: -040
Material: NBR NB70BK31 X-Ring
Size: AS568 -040 X-Ring
Part Number: NB70BK31-XR-040
NB70BK31
NBR (Nitrile, Buna-N)
70
Shore A
Silicone Oil Filled
Color: Black
Detailed Description
NB70BK31-XR-040 is a Black, 70 Shore A, NBR (Nitrile, Buna-N) X-Ring. It is a 70 durometer NBR (Nitrile, Buna-N). NB70BK31 is manufactured with the following features & specifications: Silicone Oil Filled. NB70BK31-XR-040 is AS568 size -040 X-Ring also referred to as 1.78mm (Cross Sectional Diameter (CS)) x 72.75mm (Inside Diameter (ID)). Material: 70 Durometer NBR NB70BK31 X-Ring Size: AS568 -040, 1.78mm CS X 72.75mm ID (0.070" CS X 2.864" ID)

| Technical Specification | Value |
|---|---|
| Compound Number | NB70BK31 |
| Material | NBR (Nitrile, Buna-N) |
| Color | Black |
| Durometer | 70 Shore A Hardness |
| High Temperature | 125 °C / 257 °F |
| Low Temperature | -35 °C / -31 °F |
| Geometry Specifications | |
| Cross Sectional Geometry | X-Ring |
| Size Standard | AS568 |
| Size | -040 |
| Cross Section (CS) | 1.78 mm / 0.070 in |
| Inside Diameter (ID) | 72.75 mm / 2.864 in |



