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| Brand Name : | YUE MI |
| Model Number : | 551 |
| Certification : | ISO SGS |
| Price : | consult |
| Payment Terms : | L/C, D/A, D/P, T/T, Western Union, MoneyGram |
| Supply Ability : | 500/Set/Month |
| Delivery Time : | 5-8 word days |
Mediums: oil, water, weak acid, alkali, and organic solvents.
Customization: Changes of materials for getting other operating parameters are possible. Contact us with your requirements

| Size d(mm) | d3 | BT | G4 | G9 | G6 | |||||||||
| d7 | l1 | l3 | d7 | l1 | l3 | d7 | d8 | l1 | l3 | d7 | l1 | l3 | ||
| 8 | 18 | 17.1 | 15 | 5.5 | 19.2 | 11.9 | 7.0 | |||||||
| 10 | 19 | 18.1 | 15 | 5.5 | 19.2 | 15.5 | 6.6 | 21 | 3 | 15.5 | 10 | 21 | 15.5 | 6.6 |
| 11 | 20 | 20.6 | 18 | 5.5 | ||||||||||
| 12 | 21 | 20.6 | 18 | 5.5 | 21.6 | 16.0 | 5.6 | 23 | 3 | 16.0 | 10 | 23 | 16.0 | 6.6 |
| 13 | 22 | 23.0 | 22 | 6.0 | ||||||||||
| 14 | 23 | 23.1 | 22 | 6.0 | 24.6 | 16.5 | 5.6 | 25 | 3 | 16.5 | 10 | 25 | 16.5 | 6.6 |
| 15 | 24 | 26.9 | 22 | 7.0 | 24.6 | 18.0 | 6.6 | |||||||
| 16 | 26 | 26.9 | 23 | 7.0 | 28.0 | 18.0 | 7.5 | 27 | 3 | 18.0 | 10 | 27 | 18.0 | 6.6 |
| 17 | 26 | 26.9 | 23 | 7.0 | ||||||||||
| 18 | 29 | 30.9 | 24 | 8.0 | 30.0 | 19.5 | 8.0 | 33 | 3 | 19.5 | 11.5 | 33 | 19.5 | 7.5 |
| 19 | 31 | 30.9 | 25 | 8.0 | 35.0 | 22.0 | 7.5 | |||||||
| 20 | 31 | 30.9 | 25 | 8.0 | 35.0 | 22.0 | 7.5 | 35 | 3 | 22.0 | 11.5 | 35 | 22.0 | 7.5 |
| 22 | 33 | 35.4 | 25 | 8.0 | 35.0 | 21.5 | 7.5 | 37 | 3 | 21.5 | 11.5 | 37 | 21.5 | 7.5 |
| 23 | 36 | 35.4 | 27 | 8.0 | ||||||||||
| 24 | 35 | 35.4 | 27 | 8.0 | 38.0 | 23.5 | 7.5 | 39 | 3 | 23.5 | 11.5 | 39 | 23.5 | 7.5 |
| 25 | 36 | 38.2 | 27 | 8.5 | 38.0 | 26.5 | 7.5 | 40 | 3 | 26.5 | 11.5 | 40 | 26.5 | 7.5 |
| 26 | 37 | 38.2 | 27 | 8.5 | 40.0 | 26.5 | 8.0 | |||||||
| 28 | 40 | 43.3 | 29 | 9.0 | 42.0 | 26.5 | 9.0 | 43 | 3 | 26.5 | 11.5 | 43 | 26.5 | 7.5 |
| 30 | 43 | 43.3 | 30 | 9.0 | 45.0 | 26.5 | 10.5 | 45 | 3 | 26.5 | 11.5 | 45 | 26.5 | 7.5 |
| 32 | 46 | 43.3 | 30 | 9.0 | 48.0 | 28.5 | 10.5 | 48 | 3 | 28.5 | 11.5 | 48 | 28.5 | 7.5 |
| 33 | 47 | 53.5 | 39 | 11.5 | 28.5 | 28.5 | ||||||||
| 34 | 48 | 53.5 | 39 | 11.5 | ||||||||||
| 35 | 49 | 53.5 | 39 | 11.5 | 52.0 | 28.5 | 11 | 50 | 3 | 28.5 | 11.5 | 50 | 28.5 | 7.5 |
| 36 | 50 | 53.5 | 39 | 11.5 | ||||||||||
| 38 | 53 | 60.5 | 39 | 11.5 | 55.0 | 33.5 | 10.3 | 56 | 4 | 33.5 | 14.0 | 56 | 33.5 | 9.0 |
| 40 | 56 | 60.5 | 39 | 11.5 | 58.0 | 36.0 | 10.8 | 58 | 4 | 36 | 14.0 | 58 | 36.0 | 9.0 |
| 42 | 59 | 60.5 | 39 | 11.5 | 62.0 | 38.5 | 12.0 | |||||||
| 43 | 59 | 60.5 | 39 | 11.5 | 62.0 | 38.5 | 12.0 | 61 | 4 | 38.5 | 14.0 | 61 | 38.5 | 9.0 |
| 44 | 60 | 65.5 | 41 | 11.5 | ||||||||||
| 45 | 61 | 65.5 | 41 | 11.5 | 64.0 | 39.5 | 11.6 | 63 | 4 | 39.5 | 14.0 | 63 | 39.5 | 9.0 |
| 48 | 64 | 65.5 | 41 | 11.5 | 68.4 | 46.0 | 11.6 | 66 | 4 | 46.0 | 14.0 | 66 | 46.0 | 9.0 |
| 50 | 66 | 72.5 | 45 | 11.5 | 69.3 | 45.0 | 11.6 | 70 | 4 | 45.0 | 15.0 | 70 | 45.0 | 9.5 |
| 53 | 69 | 73 | 4 | 47.0 | 15.0 | 70 | 47.0 | 9.5 | ||||||
| 55 | 71 | 72.5 | 47 | 11.5 | 75.4 | 49.0 | 13.3 | 75 | 4 | 49.0 | 15.0 | 75 | 49.0 | 11.0 |
| 58 | 76 | 78.4 | 55.0 | 13.3 | 78 | 4 | 55.0 | 15.0 | 78 | 55.0 | 11.0 | |||
| 60 | 78 | 79.3 | 49 | 11.5 | 80.4 | 55.0 | 13.3 | 80 | 4 | 55.0 | 15.0 | 80 | 55.0 | 11.0 |
| 63 | 83 | 83 | 4 | 55.0 | 15.0 | 83 | 55.0 | 11.0 | ||||||
| 65 | 84 | 84.5 | 51 | 11.5 | 85.4 | 55.0 | 13.0 | 85 | 4 | 55.0 | 15.0 | 85 | 55.0 | 11.0 |
| 68 | 88 | 91.5 | 55.0 | 13.7 | 90 | 4 | 55.0 | 18.0 | 90 | 55.0 | 11.3 | |||
| 70 | 90 | 89.5 | 51 | 11.5 | 92.0 | 57.0 | 13.0 | 92 | 4 | 57.0 | 18.0 | 92 | 57.0 | 11.3 |
| 75 | 98 | 94.5 | 57 | 11.5 | 99.0 | 62.0 | 14.0 | 97 | 4 | 62.0 | 18.0 | 97 | 62.0 | 11.3 |
| 80 | 100 | 99.5 | 59 | 11.5 | 104.0 | 61.8 | 15.0 | 105 | 4 | 61.8 | 18.2 | 105 | 61.8 | 12.0 |
Basic Features
Structure: Single End
Pressure: Low Pressure Mechanical Seals
Speed: General Speed Mechanical Seal
Temperature: General Temperature Mechanical Seal
Performance: Wear
Standard: DIN24960, ISO3069, GB6556
Model NO.: 551, 551A, BT-RN
Balance: Unbalanced
Specification: Inner Diameter: 10 mm to 55 mm
Product Detailed Description
BESTSEAL Type 551 551A Single Coil Spring Mechanical Seal for Water
Pumps, Temperature Control Pumps, Vacuum Pumps and Heat-exchange
Oil Pumps
Structural Features: single end, unbalanced, conical spring,
dependent direction of rotation, spring transmission. This seal
component has a simple structure, high compatibility and stable
performance with great spring compensation.
Industrial Standards: DIN24960, ISO3069, GB6556
Scopes of Application: widely used in water pumps, temperature
control pumps, vacuum pumps and heat-exchange oil pumps. Mainly
used in leathering, waste water treatment, plastic, and food
machinery industry. This product can be an alternative to similar
products such as John Crane Type 551 or EagleBrgmann BT-RN.
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