The robust graphite cartridge mechanical seal features a stationary cartridge design, it is a direct, high-performance replacement for OEM seals in water, chemical, and general industrial pumps.
Key Features
• Premium Material Construction: The primary sealing faces are manufactured from high-grade carbon/graphite, providing excellent self-lubricating properties, low friction, and outstanding wear resistance. This ensures extended service life and stable sealing performance even under challenging conditions.
• Cartridge Design: The fully pre-assembled cartridge configuration eliminates the need for complex on-site measurements and adjustments. It ensures precise compression of the seal faces, reducing installation errors and minimizing the risk of premature failure.
• Versatile Compatibility: Available in both 20mm and 22mm shaft sizes, this graphite mechanical seal is compatible with a wide variety of pumps, mixers, and agitators used in chemical processing, water treatment, food and beverage, and general industrial applications.
•Robust and Durable: Engineered to withstand moderate pressure and temperature variations, the carbon mechanical seal is designed for long-term, maintenance-free operation, reducing downtime and lowering total cost of ownership.
• Easy Retrofit: The cartridge design allows for quick and straightforward replacement of existing seals, making it an ideal choice for both new equipment and aftermarket upgrades.
Technical Specs | Materials | ||
Mediums | Chemical, Food, Oil, Petroleum, Pharmaceuticals Paper and pulp, Sewage treatment | Stationary Ring | Carbon/Sic/Ssic/TC |
Temperature | Elastomer Dependent | Rotary Ring | Sic/Ssic/TC |
Pressure | ≤2.8MPa | Secondary Seal | Viton/EPDM/Chemraz/Kalrez/Aflas, etc. |
Speed | ≤35m/s | Spring and Metal Part | Stainless Steel/Hast C |


Product Specifications
| D1 (mm) | D2 | D3 | D5 | L1 | L2 | L3 | L5 |
| 25 | 43.5 | 104 | 12.5 | 19 | 48 | 25 | 62 |
| 28 | 46.5 | 104 | 12.5 | 19 | 48 | 25 | 62 |
| 30 | 48.5 | 104 | 12.5 | 19 | 48 | 25 | 67 |
| 32 | 50.5 | 104 | 12.5 | 19 | 48 | 25 | 67 |
| 33 | 50.5 | 104 | 12.5 | 19 | 48 | 25 | 67 |
| 35 | 53.5 | 110 | 12.5 | 19 | 48 | 25 | 70 |
| 38 | 56.5 | 125 | 14.7 | 19 | 48 | 25 | 75 |
| 40 | 58.5 | 125 | 14.7 | 19 | 48 | 25 | 75 |
| 42 | 60.5 | 133 | 14.7 | 19 | 48 | 25 | 80 |
| 43 | 61.5 | 133 | 14.7 | 19 | 48 | 25 | 80 |
| 45 | 63.5 | 140 | 14.7 | 19 | 48 | 25 | 82 |
| 48 | 66.5 | 140 | 14.7 | 19 | 48 | 25 | 82 |
| 50 | 68.5 | 140 | 14.7 | 19 | 48 | 25 | 87 |
| 53 | 71.5 | 150 | 17.5 | 19 | 48 | 25 | 92 |
| 55 | 73.5 | 150 | 17.5 | 19 | 48 | 25 | 92 |
| 60 | 78.5 | 160 | 17.5 | 19 | 48 | 25 | 100 |
| 65 | 83.5 | 165 | 17.5 | 19 | 48 | 25 | 105 |
| 70 | 88.5 | 180 | 17.5 | 19 | 48 | 25 | 120 |
| 75 | 100 | 190 | 17.5 | 20.5 | 51.5 | 30 | 125 |
| 80 | 105 | 190 | 17.5 | 20.5 | 51.5 | 30 | 130 |
| 85 | 110 | 220 | 21.5 | 20.5 | 51.5 | 30 | 135 |
| 90 | 115 | 220 | 21.5 | 20.5 | 51.5 | 30 | 140 |
| 95 | 120 | 220 | 21.5 | 20.5 | 51.5 | 30 | 145 |
| 100 | 125 | 220 | 21.5 | 20.5 | 51.5 | 30 | 150 |
| D1 (inch) | D2 | D3 | D5 | L1 | L2 | L3 | L5 |
| 1.000 | 1.713 | 4.094 | 0.492 | 0.748 | 1.890 | 0.984 | 2.441 |
| 1.125 | 1.831 | 4.094 | 0.492 | 0.748 | 1.890 | 0.984 | 2.441 |
| 1.250 | 1.988 | 4.094 | 0.492 | 0.748 | 1.890 | 0.984 | 2.638 |
| 1.375 | 2.107 | 4.331 | 0.492 | 0.748 | 1.890 | 0.984 | 2.756 |
| 1.500 | 2.225 | 4.921 | 0.579 | 0.748 | 1.890 | 0.984 | 2.953 |
| 1.625 | 2.382 | 5.236 | 0.579 | 0.748 | 1.890 | 0.984 | 3.150 |
| 1.750 | 2.500 | 5.512 | 0.579 | 0.748 | 1.890 | 0.984 | 3.228 |
| 1.875 | 2.618 | 5.512 | 0.579 | 0.748 | 1.890 | 0.984 | 3.228 |
| 2.000 | 2.697 | 5.906 | 0.579 | 0.748 | 1.890 | 0.984 | 3.425 |
| 2.125 | 2.815 | 6.102 | 0.689 | 0.748 | 1.890 | 0.984 | 3.622 |
| 2.250 | 3.012 | 6.299 | 0.689 | 0.748 | 1.890 | 0.984 | 3.937 |
| 2.375 | 3.091 | 6.469 | 0.689 | 0.748 | 1.890 | 0.984 | 3.937 |
| 2.500 | 3.209 | 6.693 | 0.689 | 0.748 | 1.890 | 0.984 | 4.055 |
| 2.625 | 3.406 | 7.067 | 0.689 | 0.748 | 1.890 | 0.984 | 4.724 |
| 2.750 | 3.484 | 7.480 | 0.689 | 0.748 | 1.890 | 0.984 | 4.724 |
| 2.875 | 3.858 | 7.480 | 0.689 | 0.807 | 2.027 | 1.181 | 4.843 |
| 3.000 | 3.937 | 7.480 | 0.689 | 0.807 | 2.027 | 1.181 | 4.921 |
| 3.125 | 4.134 | 8.661 | 0.689 | 0.807 | 2.027 | 1.181 | 5.118 |
| 3.250 | 4.252 | 8.661 | 0.846 | 0.807 | 2.027 | 1.181 | 5.236 |
| 3.375 | 4.331 | 8.661 | 0.846 | 0.807 | 2.027 | 1.181 | 5.315 |
| 3.500 | 4.528 | 8.661 | 0.846 | 0.807 | 2.027 | 1.181 | 5.512 |
| 3.625 | 4.606 | 8.661 | 0.846 | 0.807 | 2.027 | 1.181 | 5.591 |
| 3.750 | 4.725 | 8.661 | 0.846 | 0.807 | 2.027 | 1.181 | 5.709 |
| 3.875 | 4.921 | 8.661 | 0.846 | 0.807 | 2.027 | 1.181 | 5.906 |
| 4.000 | 4.921 | 8.661 | 0.846 | 0.807 | 2.027 | 1.181 | 5.906 |
Workshop
This workshop is equipped with professional processing equipment and integrated with standardized material warehousing management, enabling a one-stop production process from precision machining to finished product delivery. It ensures part machining accuracy and production efficiency, meeting various high-specification manufacturing requirements.




Product Research, Development and Testing
Our Product R&D and Testing focuses on optimizing seal performance through advanced simulation and material analysis. All seals undergo rigorous trials, including thermal cycling and pressure tests, to ensure durability, minimal leakage, and long service life in demanding industrial environments.




Industry Solutions




Case Study
HVAC Wholesaler Feedback: An HVAC wholesaler frequently received complaints about leaks in 22mm hot water circulation pumps due to installation errors. Cartridge design reduced their return rate by 85%.
Testimonials
These 20mm seals are a bestseller in our catalog. The carbon quality is consistent, and our contractor clients love that they just slide them on.
—Michael T., Pump Parts Distributor, UK
FAQs
Q: Why choose a cartridge design for such small shaft sizes?
A: Small pumps often have very limited workspace, making it difficult for technicians to precisely install component seals manually. Even a 1mm error in spring compression can cause leakage. Our cartridge design pre-assembles all parts, eliminating installation errors and significantly extending the service life of small utility pumps.
Q: Is this 20mm/22mm cartridge seal a direct replacement for my pump's original seal?
A: In the vast majority of cases, yes. Our 20mm mechanical seal and 22mm mechanical seal cartridges are designed to ANSI/ISO dimensional standards for direct interchangeability. Please provide your pump model or old seal part number for us to confirm 100% compatibility.
Q: What is the advantage of a carbon/graphite face over other materials in this mechanical seal?
A: The carbon mechanical seal or graphite mechanical seal face offers superior self-lubrication, which is critical in applications with poor lubricity (like water) or during dry start-up. It also has excellent thermal conductivity to dissipate heat from the seal face, reducing the risk of thermal cracking. It provides a reliable and cost-effective solution for many general industrial fluids.

Our company is specialized in the production of sealing materials, mechanical seals , cartridge seals.
E-mail: gechacha@aliyun.com
Mobile: +86-18758835650
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Add: No8-2, Jinsha road Yuelin Street, Fenghua District, Ningbo, Zhejiang