OUHR type Special Packings for Piston Seals (Installed with Internal Groove)
Caution
Product Description
Main applicable fluid
● Nitrile rubber (A505)
- General petroleum hydraulic fluid oil.
- Water-glycol type hydraulic fluid oil.
- Oil-water emulsion type hydraulic fluid oil.
● Nitrile rubber (A567)
- Low temperature petroleum hydraulic fluid oil. (General petroleum hydraulic fluid oil)Note: when using general petroleum-derived operating oil, we recommend A527.
Feature
- Designed for smaller section, and able to be fitted into integrated groove.
- Improvement against stick slip has been made.
- The friction resistance is low and improvement has been made to prevent damages caused by back pressure.
- Nitrile rubber that has excellent low temperature resistance is employed and can be used with special low temperature hydraulic fluid oil (MIL H 5606E).
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Special Packing for Piston seals
R = 0.3 or below, R1 = 0.5 or below, R2 = 1
The inner surface of the cylinder tube should be finished by burnishing (RLB) or honing (GH) to 0.4 to 3.2 μmRz (0.1 to 0.8 μmRa).
Especially under serve lubricating condition, burnishing is required.
● The roughness is JIS B 0601:2001. When regulation length cannot be kept, apply Pt.
How to Determine B dimension
■ When using backup ring. Please determine B dimension according to the table below.
| Maximum Service Pressure | 14MPa | 21MPa |
| Material of Backup ring | 19YF | |
| B dimension | B≧φD-1.0 | B≧φD-0.5 |
considering the eccentricity of operating condition of the piston.
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Specification Table
OUHR type Nitrile Rubber (NBR)
Material : Standard NOK A505 / Cold resistant type NOK A567
| Nominal size of Packing, and housing dimensions | Packing Part Number | Combination Backup Ring Part Number | |||||||
| D | d | h | HA | HB | φD1 | C | Standard （A505） | Cold-Resistant （A567） | BRT2 (Bias-cut) 19YF |
| 32 | 24 | 5 | 5.7 | 7.7 | 31 | 3.5 | CU2683Q2 | CU2683Q3 | GN5727V0 |
| 40 | 30 | 6 | 7 | 10 | 39 | 3.5 | CU2684Q3 | CU2684Q5 | GN4794V0 |
| 50 | 40 | 6 | 7 | 10 | 49 | 3.5 | CU2604Q3 | CU2604Q4 | GN4050V0 |
| 55 | 45 | 6 | 7 | 10 | 54 | 3.5 | CU2697Q1 | GN4804V0 | |
| 60 | 50 | 6 | 7 | 10 | 59 | 3.5 | CU2696Q2 | CU2696Q3 | GN4335V0 |
| 63 | 53 | 6 | 7 | 10 | 62 | 3.5 | CU2685Q0 | CU2685Q4 | GN4693V0 |
| 65 | 55 | 6 | 7 | 10 | 64 | 3.5 | CU2930Q2 | CU2930Q3 | GN4810V0 |
| 70 | 60 | 6 | 7 | 10 | 69 | 3.5 | CU2634Q2 | GN4676V0 | |
| 75 | 62 | 7.5 | 8.5 | 11.5 | 74 | 4.5 | CU2943Q2 | CU2943Q3 | GN5712V0 |
| 80 | 65 | 9 | 10 | 13 | 79 | 4.5 | CU2666Q2 | CU2666Q3 | GN4549V0 |
| 80 | 71 | 6 | 7 | 10 | 79 | 4.5 | CU3238Q1 | GN4818V0 | |
| 85 | 70 | 9 | 10 | 13 | 84 | 4.5 | CU0977Q2 | CU0977Q3 | GN4876V0 |
| 95 | 80 | 9 | 10 | 13 | 94 | 4.5 | CU2605Q2 | CU2605Q4 | GN5023V0 |
| 100 | 85 | 9 | 10 | 13 | 98 | 4.5 | CU2669Q2 | CU2669Q3 | GN4687V0 |
| 110 | 95 | 9 | 10 | 13 | 108 | 4.5 | CU2607Q2 | CU2607Q3 | GN4822V0 |
| 115 | 100 | 9 | 10 | 13 | 113 | 4.5 | CU3241Q2 | GN4512V0 | |
| 125 | 110 | 9 | 10 | 13 | 123 | 4.5 | CU2670Q2 | GN4480V0 | |
| 125 | 112 | 8.5 | 9.5 | 12.5 | 123 | 4.5 | CU3492Q0 | GN4827V0 | |
| 140 | 125 | 9 | 10 | 13 | 138 | 4.5 | CU2647Q3 | CU2647Q2 | GN4481V0 |
| 150 | 136 | 8.5 | 9.5 | 12.5 | 148 | 4.5 | CU3244Q1 | GN4830V0 | |
| 160 | 145 | 9 | 10 | 13 | 158 | 4.5 | CU2687Q1 | GN4551V0 | |
| 180 | 165 | 9 | 10 | 14 | 178 | 4.5 | CU2688Q1 | GN4836V0 | |
| 200 | 180 | 12 | 13 | 17 | 198 | 5.5 | CU1539Q1 | CU1539Q2 | GN4470V0 |
| 224 | 204 | 12 | 13 | 17 | 222 | 5.5 | CU3491Q0 | GN4842V0 | |
| 250 | 230 | 12 | 13 | 17 | 248 | 5.5 | CU2691Q2 | CU2691Q3 | GN4635V0 |