SRS-59U Mechanical Seal - John Crane Type 59U Replacement
High quality multiple spring mechanical seal designed for centrifugal pumps and compatible with John Crane, Aesseal, and Sterling sealing systems.
Direct Replacement For
- BT-C56.KU Seal
- John Crane T59U Seal
- Aesseal M03 Seal
- Sterling 259 Seal
Structural Features
Single end, multiple springs, unbalanced design with independent direction of rotation. Features bolt and lug transmission for simple and reliable operation. Pre-assembled compensation components ensure easy installation and optimal performance with balanced seal face loading.
Applications
Ideal for oil industry, chemical engineering, chemical fiber, food processing, pharmaceutical, paper pulp, and environmental protection industries. Designed for chemical pumps, water pumps, piping pumps, screw pumps, compressors and other rotary equipment.
Technical Specifications
Dimensions & Materials
Shaft Size Range: 14mm - 100mm
Face Materials: Carbon, Silicon Carbide (SiC), Tungsten Carbide (TC)
Seat Materials: Ceramic, Silicon Carbide (SiC), Tungsten Carbide (TC)
O-rings: PTFE
Spring Materials: SS304, SS316, Hastelloy C
Metal Components: SS304, SS316
Performance Capabilities
Temperature Range: -50°C to 500°C
Maximum Pressure: Up to 10 bar
Maximum Speed: Up to 20 m/s
Axial Float Allowance: ±0.1mm
Dimensional Specifications
| SIZE/METRIC |
D3 |
D6 |
D7 |
L3 |
L4 |
| 14 | 24 | 21 | 25 | 23.0 | 12.0 |
| 16 | 26 | 23 | 27 | 23.0 | 12.0 |
| 18 | 32 | 27 | 33 | 24.0 | 13.5 |
| 20 | 34 | 29 | 35 | 24.0 | 13.5 |
| 22 | 36 | 31 | 37 | 24.0 | 13.5 |
| 24 | 38 | 33 | 39 | 26.7 | 13.3 |
| 25 | 39 | 34 | 40 | 27.0 | 13.0 |
| 28 | 42 | 37 | 43 | 30.0 | 12.5 |
| 30 | 44 | 39 | 45 | 30.5 | 12.0 |
| 32 | 46 | 42 | 48 | 30.5 | 12.0 |
| 33 | 47 | 42 | 48 | 30.5 | 12.0 |
| 35 | 49 | 44 | 50 | 30.5 | 12.0 |
| 38 | 54 | 49 | 56 | 32.0 | 13.0 |
| 40 | 56 | 51 | 58 | 32.0 | 13.0 |
| 43 | 59 | 54 | 61 | 32.0 | 13.0 |
| 45 | 61 | 56 | 63 | 32.0 | 13.0 |
| 48 | 64 | 59 | 66 | 32.0 | 13.0 |
| 50 | 66 | 62 | 70 | 34.0 | 13.5 |
| 53 | 69 | 65 | 73 | 34.0 | 13.5 |
| 55 | 71 | 67 | 75 | 34.0 | 13.5 |
| 58 | 78 | 70 | 78 | 39.0 | 13.5 |
| 60 | 80 | 72 | 80 | 39.0 | 13.5 |
| 63 | 83 | 75 | 83 | 39.0 | 13.5 |
| 65 | 85 | 77 | 85 | 39.0 | 13.5 |
| 68 | 88 | 81 | 90 | 39.0 | 13.5 |
| 70 | 90 | 83 | 92 | 45.5 | 14.5 |
| 75 | 95 | 88 | 97 | 45.5 | 14.5 |
| 80 | 104 | 95 | 105 | 45.0 | 15.0 |
| 85 | 109 | 100 | 110 | 45.0 | 15.0 |
| 90 | 114 | 105 | 115 | 50.0 | 15.0 |
| 95 | 119 | 110 | 120 | 50.0 | 15.0 |
| 100 | 124 | 115 | 125 | 50.0 | 15.0 |