Model NO.: Type 21 mechanical seal
Specification: 1'',1 1/4'',1 3/8'',1 5/8'',1 3/4'',1 7/8'',2 1/8'
Temperature: high temperature mechanical seal
Balance: Unbalanced
Type: Multi-Spring
Accreditation: ISO, SGS, UL, ROHS
Service: OEM/ODM
Origin: China
Key Features
• Standardized ANSI Fit: Precisely dimensioned for the common 5/8" shaft size found in thousands of pump models, ensuring high compatibility for rotating mechanical seal and stationary mechanical seal configurations. This makes our 5/8" Mechanical Seals the ideal drop-in solution for a wide range of equipment.
• Simplified Upgrade Path: The easiest way to convert from packing or component seals to a cartridge system featuring either a rotating mechanical seal or a stationary mechanical seal design, reducing installation time by 70%.
• Robust Stationary Element: Features a pin-locked stationary seat that prevents rotation and ensures stability for the stationary mechanical seal component, even during start-up torque spikes, providing reliable sealing performance.
• Pre-Set Working Length:5/8" Mechanical Seals are factory-assembled to the exact working height, removing the need for technicians to mark shafts or calculate compression, whether you choose a rotating mechanical seal or stationary mechanical seal assembly.
• Hydraulically Balanced: The rotating mechanical seal face geometry is balanced to handle pressure fluctuations without separating or overheating, ensuring the long-term reliability of the entire stationary mechanical seal and rotating assembly.
Technical Specs | 5/8" Mechanical Seals 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 |
| 43.5 | 104 | 12.5 | 19 | 38 | 25 | 62 | |
| 25 | 43.5 | 104 | 12.5 | 19 | 38 | 25 | 62 |
| 28 | 46.5 | 104 | 12.5 | 19 | 38 | 25 | 62 |
| 30 | 48.5 | 104 | 12.5 | 19 | 38 | 25 | 67 |
| 32 | 50.5 | 104 | 12.5 | 19 | 38 | 25 | 67 |
| 33 | 50.5 | 104 | 12.5 | 19 | 38 | 25 | 67 |
| 35 | 53.5 | 110 | 12.5 | 19 | 38 | 25 | 70 |
| 38 | 56.5 | 125 | 14.7 | 19 | 38 | 25 | 75 |
| 40 | 58.5 | 125 | 14.7 | 19 | 38 | 25 | 75 |
| 42 | 60.5 | 133 | 14.7 | 19 | 38 | 25 | 80 |
| 43 | 61.5 | 133 | 14.7 | 19 | 38 | 25 | 80 |
| 45 | 63.5 | 140 | 14.7 | 19 | 38 | 25 | 82 |
| 48 | 66.5 | 140 | 14.7 | 19 | 38 | 25 | 82 |
| 50 | 68.5 | 140 | 14.7 | 19 | 38 | 25 | 87 |
| 53 | 71.5 | 150 | 17.5 | 19 | 38 | 25 | 92 |
| 55 | 73.5 | 150 | 17.5 | 19 | 38 | 25 | 92 |
| 60 | 78.5 | 160 | 17.5 | 19 | 38 | 25 | 100 |
| 65 | 83.5 | 165 | 17.5 | 19 | 38 | 25 | 105 |
| 70 | 88.5 | 180 | 17.5 | 19 | 38 | 25 | 120 |
| 75 | 100 | 190 | 17.5 | 20.5 | 41.5 | 30 | 125 |
| 80 | 105 | 190 | 17.5 | 20.5 | 41.5 | 30 | 130 |
| 85 | 110 | 220 | 21.5 | 20.5 | 41.5 | 30 | 135 |
| 90 | 115 | 220 | 21.5 | 20.5 | 41.5 | 30 | 140 |
| 95 | 120 | 220 | 21.5 | 20.5 | 41.5 | 30 | 145 |
| 100 | 125 | 220 | 21.5 | 20.5 | 41.5 | 30 | 150 |
| D1 (inch) | D2 | D3 | D5 | L1 | L2 | L3 | L5 |
| 1.000 | 1.713 | 4.094 | 0.492 | 0.748 | 1.496 | 0.984 | 2.441 |
| 1.125 | 1.831 | 4.094 | 0.492 | 0.748 | 1.496 | 0.984 | 2.441 |
| 1.250 | 1.988 | 4.094 | 0.492 | 0.748 | 1.496 | 0.984 | 2.638 |
| 1.375 | 2.107 | 4.331 | 0.492 | 0.748 | 1.496 | 0.984 | 2.756 |
| 1.500 | 2.225 | 4.921 | 0.579 | 0.748 | 1.496 | 0.984 | 2.953 |
| 1.625 | 2.382 | 5.236 | 0.579 | 0.748 | 1.496 | 0.984 | 3.150 |
| 1.750 | 2.500 | 5.512 | 0.579 | 0.748 | 1.496 | 0.984 | 3.228 |
| 1.875 | 2.618 | 5.512 | 0.579 | 0.748 | 1.496 | 0.984 | 3.228 |
| 2.000 | 2.697 | 5.906 | 0.579 | 0.748 | 1.496 | 0.984 | 3.425 |
| 2.125 | 2.815 | 6.102 | 0.689 | 0.748 | 1.496 | 0.984 | 3.622 |
| 2.250 | 3.012 | 6.299 | 0.689 | 0.748 | 1.496 | 0.984 | 3.937 |
| 2.375 | 3.091 | 6.469 | 0.689 | 0.748 | 1.496 | 0.984 | 3.937 |
| 2.500 | 3.209 | 6.693 | 0.689 | 0.748 | 1.496 | 0.984 | 4.055 |
| 2.625 | 3.406 | 7.067 | 0.689 | 0.748 | 1.496 | 0.984 | 4.724 |
| 2.750 | 3.484 | 7.480 | 0.689 | 0.748 | 1.496 | 0.984 | 4.724 |
| 2.875 | 3.858 | 7.480 | 0.689 | 0.807 | 1.634 | 1.181 | 4.843 |
| 3.000 | 3.937 | 7.480 | 0.689 | 0.807 | 1.634 | 1.181 | 4.921 |
| 3.125 | 4.134 | 8.661 | 0.689 | 0.807 | 1.634 | 1.181 | 5.118 |
| 3.250 | 4.252 | 8.661 | 0.846 | 0.807 | 1.634 | 1.181 | 5.236 |
| 3.375 | 4.331 | 8.661 | 0.846 | 0.807 | 1.634 | 1.181 | 5.315 |
| 3.500 | 4.528 | 8.661 | 0.846 | 0.807 | 1.634 | 1.181 | 5.512 |
| 3.625 | 4.606 | 8.661 | 0.846 | 0.807 | 1.634 | 1.181 | 5.591 |
| 3.750 | 4.725 | 8.661 | 0.846 | 0.807 | 1.634 | 1.181 | 5.709 |
| 3.875 | 4.921 | 8.661 | 0.846 | 0.807 | 1.634 | 1.181 | 5.906 |
| 4.000 | 4.921 | 8.661 | 0.846 | 0.807 | 1.634 | 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 of 5/8" Mechanical Seals, meeting various high-specification manufacturing requirements.




Product Research, Development and Testing
Our 5/8" mechanical seals 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
Upgrade in a Textile Factory: A textile factory was using packing on their 5/8" water transfer pumps, resulting in constant leakage and shaft sleeve wear. We replaced them with our 5/8" Mechanical Seals. The pre-set assembly meant their in-house mechanic could install it in minutes. Result: The pump floor is dry, and shaft wear has stopped completely.
Testimonials
We stock these 5/8 cartridges by the dozen. They fit almost every small centrifugal pump we service, and the pre-set clips make installation foolproof.
—David L., MRO Buyer, Canada
FAQs about 5/8" Rotating & Stationary Cartridge Mechanical Seals
Q: Does this replace a standard Type 1 component seal directly?
A: Yes, absolutely. This cartridge is engineered as a direct dimensional upgrade for the Type 1 component seal. It fits into the same standard stuffing box space but eliminates the need for manual setting measurements, sleeve glueing, and spring compression calculations, offering a much higher reliability factor and eliminating installation errors.
Q: Is a 5/8" mechanical seal compatible with my pump?
A: Yes, absolutely. This cartridge is engineered as a direct dimensional upgrade for the Type 1 component seal. It fits into the same standard stuffing box space but eliminates the need for manual setting measurements, sleeve glueing, and spring compression calculations, offering a much higher reliability factor and eliminating installation errors.

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