ISI, Rod Seal | What ISI, Rod Seal ? NOK OIL SEAL | A2Z SEALS
Special Packing for Rod Seals
R = 0.3 or below, R1 = 0.5 or below, R2 = 1
The surface of the rod should be finished by buffing (SPBF) to 0.8 to 1.6 μmRz (0.2 to 0.4 μmRz).
•The roughness is JIS B 2601 : 2001. When regulation length cannot be kept, apply Pt.
NOK OIL SEAL
Nok oil seal is a mechanical component used to seal oil. It isolates the parts of the transmission component that need to be lubricated from the output components so that lubrication and leakage are not allowed.
How to Determine B dimension
■ When using backup ring. Please determine B dimension according to the table below.
| Maximum Service Pressure | 14MPa | 21MPa | 35MPa |
| Material of Backup ring | 19YF | ||
| B dimension | B ≦ ø D + 1.0 | B ≦ ø D + 0.5 | B ≦ ø D + 0.2 |
| Maximum Service Pressure | 35MPa | 42MPa |
| Material of Backup ring | 80NP | |
| B dimension | B ≦ ø D + 0.8 | B ≦ ø D + 0.4 |
■ When not using backup ring.
To determine B dimension, please refer to the graph in the right
for the maximum extrusion gap (one side) considering the eccentricity of operating condition of the rod.
Specification Table
ISI type Iron rubber (PUR)
Material : Standard : NOK U801 / Heat Resistant type : NOK U641
ISI type Iron rubber (PUR)
Material : Standard : NOK U801 / Heat Resistant type : NOK U641