• Optimized Spring Rate: The spring design is tuned to provide adequate face loading in a shorter compressed length, ensuring a tight seal without excessive face wear.
• Shaft Protection: The interference fit of the spring and rubber bellows protects the shaft area under the seal from corrosion.
Key Features
• Compact Duty: A specialized variant of the M3 series, the M3255 is designed for specific pump housings with limited axial space.
• Reliable Performance: Maintains the robust conical spring drive mechanism of the M3 family but in a more compact envelope.
• Economic Solution: A cost-effective repair solution for mass-produced domestic and light industrial water pumps.
Technical Specs | Materials | ||
Mediums | Water, oil and weakly-corrosive mediums | Stationary Ring | Ceramic/Sic/TC |
Pressure | ≤1.4MPa | Rotary Ring | Carbon/Sic/TC |
Temperature | -20℃ to 120℃ | Secondary Seal | NBR/EPDM/Viton |
Speed | ≤15m/s | Spring and Metal Part | Stainless Steel |
Product Specifications
| D1 (inch) | Size Code | D1 (mm) | Size Code | D3 | D7 | L1 | L4 |
| 0.500 | 0127 | 12 | 0120 | 25.00 | 27.79 | 44.00 | 8.74 |
| 14 | 0140 | 29.00 | 30.95 | 44.00 | 10.32 | ||
| 0.625 | 0158 | 16 | 0160 | 29.00 | 30.95 | 44.00 | 10.32 |
| 0.750 | 0191 | 18 | 0180 | 32.00 | 34.15 | 44.00 | 10.32 |
| 20 | 0200 | 33.00 | 35.70 | 44.00 | 10.32 | ||
| 0.875 | 0222 | 22 | 0220 | 35.00 | 37.30 | 44.00 | 10.32 |
| 24 | 0240 | 38.00 | 40.50 | 44.00 | 10.32 | ||
| 1.000 | 0254 | 25 | 0250 | 38.00 | 40.50 | 44.00 | 10.32 |
| 1.125 | 0286 | 28 | 0280 | 46.00 | 47.63 | 60.00 | 11.99 |
| 30 | 0300 | 49.00 | 50.80 | 60.00 | 11.99 | ||
| 1.250 | 0317 | 32 | 0320 | 49.00 | 50.80 | 60.00 | 11.99 |
| 33 | 0330 | 52.00 | 53.98 | 60.00 | 11.99 | ||
| 1.375 | 0349 | 35 | 0350 | 52.00 | 53.98 | 60.00 | 11.99 |
| 1.500 | 0381 | 38 | 0380 | 56.00 | 57.15 | 60.00 | 11.99 |
| 1.625 | 0412 | 40 | 0400 | 59.00 | 60.35 | 60.00 | 11.99 |
| 43 | 0430 | 62.00 | 63.50 | 71.00 | 11.99 | ||
| 1.750 | 0444 | 45 | 0450 | 62.00 | 63.50 | 71.00 | 11.99 |
| 1.875 | 0476 | 48 | 0480 | 65.00 | 66.70 | 71.00 | 11.99 |
| 2.000 | 0508 | 50 | 0500 | 68.00 | 69.85 | 71.00 | 13.50 |
| 2.125 | 0539 | 53 | 0530 | 71.00 | 73.05 | 71.00 | 13.50 |
| 2.250 | 0571 | 55 | 0550 | 75.00 | 76.20 | 71.00 | 13.50 |
| 2.375 | 0603 | 60 | 0600 | 78.00 | 79.40 | 71.00 | 13.50 |
| 2.500 | 0635 | 63 | 0630 | 81.00 | 82.55 | 71.00 | 13.50 |
| 2.625 | 0666 | 65 | 0650 | 86.00 | 92.10 | 71.00 | 15.90 |
| 2.750 | 0698 | 70 | 0700 | 89.00 | 95.25 | 70.00 | 15.90 |
| 2.875 | 0730 | 73 | 0730 | 92.00 | 98.45 | 73.00 | 15.90 |
| 3.000 | 0762 | 75 | 0750 | 95.00 | 101.65 | 73.00 | 15.90 |
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
Domestic Booster: A residential pressure booster pump failed. The OEM seal was unavailable separately. We identified it as an M3255 type. The replacement fit the tight housing perfectly, saving the homeowner from buying a new pump.
Testimonials
Hard to find these specific M3 variants sometimes. Glad you stock the M3255. It's a lifesaver for older pumps.
—Plumbing Supply Wholesaler, Spain
FAQs about Metal Bellows Seals for High Temperature Pumps
Q: How do I know if I need M3255 or standard M3?
A: Measure the installed working length (L1k) of your old seal. M3255 has a specific short length compared to the standard M3N. Check our dimension chart to confirm.
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
