12D Single Spring Mechanical Seal
Qixing manufactures the 12D Single Spring Mechanical Seal for OEM and replacement applications. This O-ring mechanical seal is available for 10-100 mm shaft sizes and works within a temperature range of -40°C to +200°C, with pressure up to 1 MPa and sliding speed up to 15 m/s.
The 12D Single Spring Mechanical Seal uses a single coil spring and O-ring secondary sealing arrangement. Its broad shaft-size range makes it suitable for new equipment, maintenance replacement and dimensional matching projects where a compact spring-loaded seal is required.
For replacement work, the shaft diameter should be checked together with D7, D6, D3, L3 and L. These dimensions help confirm the stationary-seat fit, rotating assembly envelope and available axial installation space before production.
Key Features
- Single coil spring design with O-ring secondary sealing.
- Available shaft diameter range from 10 mm to 100 mm.
- Operating temperature range from -40°C to +200°C.
- Maximum operating pressure up to 1 MPa.
- Maximum sliding speed up to 15 m/s.
- Multiple material-code options for seal faces, secondary seals, springs and metal parts.
- Suitable for clean water, sewage water, oil and other moderately corrosive fluids.
- Suitable for dimensional matching using samples, drawings or existing seal measurements.
Technical Specifications
| Item | Specification |
| Product | 12D Single Spring Mechanical Seal |
| Seal Series | O-ring Mechanical Series |
| Spring Arrangement | Single coil spring |
| Shaft Size | 10-100 mm |
| Temperature | -40°C to +200°C |
| Pressure | ≤ 1 MPa |
| Sliding Speed | ≤ 15 m/s |
| Stationary Ring Codes | Q2 / U2 / V |
| Rotary Ring Codes | Q2 / B / U2 |
| Secondary Seal Codes | P / E / V |
| Spring & Metal Part Codes | F / G |
| Applicable Media | Clean water / sewage water / oil / other moderately corrosive fluids |
Material Selection
The 12D series supports different material-code combinations. Final selection should be based on the actual medium, temperature, pressure and operating speed rather than the model number alone.
- Stationary ring: Q2 / U2 / V
- Rotary ring: Q2 / B / U2
- Secondary seal: P / E / V
- Spring and metal parts: F / G
Applications
The 12D Single Spring Mechanical Seal can be used with clean water, sewage water, oil and other moderately corrosive fluids. For sewage, oil or corrosive service, the actual fluid composition, temperature and pressure should be confirmed before the material combination is finalized.
How to Select the Correct 12D Size
- Confirm the shaft diameter d.
- Compare D7 and D6 with the stationary-seat installation dimensions.
- Check D3 for the rotating assembly envelope.
- Check L3 and L for available axial installation space.
- Confirm the working medium, temperature, pressure and shaft speed.
- For replacement projects, provide clear photos, a sample or an existing drawing whenever possible.
Why Choose Qixing
Qixing, the mechanical seal brand of Ningbo Yade Fluid Connector Co.,Ltd, manufactures and supplies mechanical seals for industrial customers. For the 12D series, we can review standard sizes as well as replacement requirements based on shaft dimensions, installation data, samples, drawings and operating conditions.
Frequently Asked Questions
What sizes are available for the 12D Single Spring Mechanical Seal?
The available shaft diameter range is 10 mm to 100 mm.
What is the operating temperature range?
The 12D operates from -40°C to +200°C. Material compatibility should still be checked for the actual medium.
What is the maximum operating pressure?
The maximum operating pressure is 1 MPa.
What is the maximum sliding speed?
The maximum sliding speed is 15 m/s.
What fluids can the 12D be used with?
Typical media include clean water, sewage water, oil and other moderately corrosive fluids.
Which dimensions should be checked for replacement?
Check shaft diameter d together with D7, D6, D3, L3 and L.
Can Qixing match an existing seal?
Yes. Replacement matching can be reviewed using dimensions, photos, samples or drawings together with the operating conditions.
Is shaft diameter enough to confirm the correct seal?
No. Shaft diameter identifies the basic size, but the stationary-seat and axial installation dimensions should also be checked.
What information should I provide for quotation?
Provide shaft size, key installation dimensions, medium, temperature, pressure, speed and any available photos or drawings.
Can the material combination be changed for different applications?
Yes. The material-code combination should be selected according to the actual working medium and operating conditions.
12D Dimension Table
Dimensions are in millimeters. Confirm the critical dimensions against the existing installation before production.
| Model | d | D7 | D6 | D3 | L3 | L |
| 12D-10 | 10 | 21.00 | 17.00 | 19.00 | 15.00 | 7.00 |
| 12D-12 | 12 | 23.00 | 19.00 | 21.00 | 18.00 | 7.00 |
| 12D-14 | 14 | 25.00 | 21.00 | 23.00 | 22.00 | 7.00 |
| 12D-16 | 16 | 27.00 | 23.00 | 26.00 | 23.00 | 7.00 |
| 12D-18 | 18 | 33.00 | 27.00 | 29.00 | 24.00 | 10.00 |
| 12D-20 | 20 | 35.00 | 29.00 | 31.00 | 25.00 | 10.00 |
| 12D-22 | 22 | 37.00 | 31.00 | 33.00 | 25.00 | 10.00 |
| 12D-24 | 24 | 39.00 | 33.00 | 35.00 | 27.00 | 10.00 |
| 12D-25 | 25 | 40.00 | 34.00 | 36.00 | 27.00 | 10.00 |
| 12D-28 | 28 | 43.00 | 37.00 | 40.00 | 29.00 | 10.00 |
| 12D-30 | 30 | 45.00 | 39.00 | 43.00 | 30.00 | 10.00 |
| 12D-32 | 32 | 48.00 | 42.00 | 46.00 | 30.00 | 10.00 |
| 12D-33 | 33 | 48.00 | 42.00 | 46.00 | 39.00 | 10.00 |
| 12D-35 | 35 | 50.00 | 44.00 | 49.00 | 39.00 | 10.00 |
| 12D-38 | 38 | 56.00 | 49.00 | 53.00 | 42.00 | 13.00 |
| 12D-40 | 40 | 58.00 | 51.00 | 56.00 | 42.00 | 13.00 |
| 12D-43 | 43 | 61.00 | 54.00 | 59.00 | 47.00 | 13.00 |
| 12D-45 | 45 | 63.00 | 56.00 | 61.00 | 47.00 | 13.00 |
| 12D-48 | 48 | 66.00 | 59.00 | 64.00 | 47.00 | 13.00 |
| 12D-50 | 50 | 70.00 | 62.00 | 66.00 | 46.00 | 14.00 |
| 12D-53 | 53 | 73.00 | 65.00 | 69.00 | 56.00 | 14.00 |
| 12D-55 | 55 | 75.00 | 67.00 | 71.00 | 56.00 | 14.00 |
| 12D-58 | 58 | 78.00 | 70.00 | 76.00 | 56.00 | 14.00 |
| 12D-60 | 60 | 80.00 | 72.00 | 78.00 | 56.00 | 14.00 |
| 12D-63 | 63 | 83.00 | 75.00 | 81.00 | 56.00 | 14.00 |
| 12D-65 | 65 | 85.00 | 77.00 | 84.00 | 66.00 | 14.00 |
| 12D-68 | 68 | 90.00 | 81.00 | 88.00 | 64.00 | 16.00 |
| 12D-70 | 70 | 92.00 | 83.00 | 89.60 | 64.00 | 16.00 |
| 12D-75 | 75 | 97.00 | 88.00 | 98.00 | 64.00 | 16.00 |
| 12D-80 | 80 | 105.00 | 95.00 | 100.00 | 72.00 | 18.00 |
| 12D-85 | 85 | 110.00 | 100.00 | 107.50 | 72.00 | 18.00 |
| 12D-90 | 90 | 115.00 | 105.00 | 111.00 | 72.00 | 18.00 |
| 12D-95 | 95 | 120.00 | 110.00 | 119.00 | 72.00 | 18.00 |
| 12D-100 | 100 | 125.00 | 115.00 | 123.80 | 72.00 | 18.00 |
Hot Tags: China 12D Single Spring Mechanical Seal Manufacturer, Supplier, Factory
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