The 109B Mechanical Seal is a high-performance industrial sealing solution designed for pumps and rotating equipment operating in demanding chemical environments. Engineered for durability and efficiency, it delivers reliable sealing performance with enhanced resistance to corrosion and aggressive media.
This model features a PTFE (Teflon) secondary seal, making it ideal for applications requiring superior chemical resistance. It supports a wide range of material combinations including carbon, ceramic, silicon carbide, and stainless steel, ensuring flexibility across various industrial uses.
With its multi-spring design and ability to operate in both directions, the 109B provides stable performance, reduced wear on shafts and sleeves, and long service life even under continuous operation.
- High-performance mechanical seal for chemical applications
- PTFE (Teflon) secondary seal for superior corrosion resistance
- Multi-spring design for enhanced stability
- Operates in both directions (bi-directional sealing)
- Suitable for pumps, mixers, and rotating equipment
- Supports multiple materials (Carbon / SIC / Ceramic / SS304)
- Reduced shaft and sleeve wear
| Seal size (inches) | d | d 0 | d 3 | d 4 | d 6 | d 7 | l 1 | l 3 | l 4 |
| 0.625 | 12.7 | 15.88 | 30.7 | 34 | 13.4 | 25.40 | 27 | 7.95 | 4.8 |
| 0.750 | 15.9 | 19.05 | 34.0 | 37 | 16.6 | 31.75 | 30 | 10.3 | 4.8 |
| 0.875 | 19.1 | 22.23 | 37.2 | 40 | 19.7 | 34.93 | 32 | 10.3 | 6.4 |
| 1.000 | 22.2 | 25.40 | 40.3 | 43 | 22.9 | 38.10 | 33 | 10.3 | 6.4 |
| 1.125 | 25.4 | 28.58 | 43.5 | 46 | 26.1 | 41.28 | 35 | 11.1 | 7.9 |
| 1.250 | 28.6 | 31,75 | 48.3 | 51 | 29.3 | 44.45 | 35 | 11.1 | 7.9 |
| 1.375 | 28.6 | 34.93 | 51.5 | 54 | 29.3 | 44.45 | 37 | 11.1 | 8.7 |
| 1.500 | 31.8 | 38.10 | 54.6 | 58 | 32.4 | 47.63 | 37 | 11.1 | 8.7 |
| 1.625 | 34.9 | 41.28 | 61.0 | 64 | 35.6 | 50.80 | 45 | 11.1 | 8.7 |
| 1.750 | 38.1 | 44.45 | 64.2 | 67 | 39.8 | 53.98 | 45 | 11.1 | 9.5 |
| 1.875 | 41.3 | 47.63 | 67.3 | 70 | 42.4 | 60.33 | 45 | 12.7 | 9.5 |
| 2.000 | 44.5 | 50.80 | 70.5 | 73 | 45.5 | 63.50 | 45 | 12.7 | 9.5 |
| 2.125 | 47.6 | 53.98 | 76.9 | 80 | 48.7 | 66.68 | 52 | 12.7 | 11.1 |
| 2.250 | 50.8 | 57.15 | 80.0 | 83 | 51.9 | 69.86 | 52 | 12.7 | 11.1 |
| 2.375 | 54.0 | 60.33 | 83.2 | 86 | 55.0 | 76.20 | 52 | 14.3 | 11.1 |
| 2.500 | 57.2 | 63.50 | 86.4 | 89 | 58.2 | 79.38 | 52 | 14.3 | 11.1 |
| 2.625 | 60.3 | 66.68 | 89.6 | 92 | 61.4 | 82.55 | 52 | 14.3 | 11.1 |
| 2.750 | 63.5 | 69.85 | 92.7 | 96 | 64.6 | 85.73 | 52 | 14.3 | 11.1 |
| 2.875 | 66.7 | 73.03 | 95.9 | 99 | 67.7 | 85.73 | 52 | 14.3 | 11.1 |
| 3.000 | 69.9 | 76.20 | 97.5 | 100 | 70.9 | 88.90 | 52 | 15.9 | 11.1 |
| 3.125 | 73.0 | 79.38 | 100.7 | 104 | 74.1 | 95.25 | 52 | 15.9 | 11.1 |
| 3.250 | 76.2 | 82.55 | 105.4 | 108 | 77.3 | 98.43 | 52 | 15.9 | 14.3 |
| 3.375 | 79.4 | 85.73 | 108.6 | 111 | 80.5 | 101.60 | 52 | 19.8 | 14.3 |
| 3.500 | 82.6 | 88.90 | 111.8 | 115 | 83.6 | 104.78 | 52 | 19.8 | 14.3 |
| 3.625 | 85.7 | 92.08 | 115.0 | 118 | 86.8 | 107.95 | 52 | 19.8 | 14.3 |
| 3.750 | 88.9 | 95.25 | 118.1 | 121 | 90.0 | 111.13 | 52 | 19.8 | 14.3 |
| 3.875 | 92.1 | 98.43 | 121.3 | 124 | 93.1 | 114.30 | 52 | 19.8 | 14.3 |
| 4.000 | 95.3 | 101.60 | 124.5 | 127 | 96.3 | 117.48 | 52 | 19.8 | 14.3 |
| 4.125 | 98.4 | 104.78 | 127.7 | 131 | 99.5 | 120.65 | 52 | 19.8 | 14.3 |
| 4.250 | 101.6 | 107.95 | 130.8 | 134 | 102.7 | 123.83 | 52 | 19.8 | 14.3 |
| 4.375 | 104.8 | 111.13 | 134.0 | 137 | 106.3 | 130.18 | 52 | 19.8 | 14.3 |
| 4.500 | 108.0 | 114.30 | 137.2 | 140 | 109.5 | 133.35 | 52 | 19.8 | 14.3 |
| 4.625 | 108.0 | 117.48 | 149.9 | 153 | 109.5 | 133.35 | 64 | 19.8 | 15.9 |
| 4.750 | 111.1 | 120.65 | 153.1 | 156 | 112.7 | 136.35 | 64 | 19.8 | 15.9 |
| 4.875 | 114.3 | 123.83 | 156.2 | 159 | 115.9 | 139.70 | 64 | 19.8 | 15.9 |
| 5.000 | 117.5 | 127.00 | 159.4 | 165 | 119.0 | 142.88 | 64 | 19.8 | 15.9 |
| 5.125 | 120.7 | 130.18 | 162.6 | 168 | 122.2 | 146.05 | 64 | 19.8 | 15.9 |
| 5.250 | 123.8 | 133.35 | 165.8 | 172 | 125.4 | 149.23 | 64 | 19.8 | 15.9 |
| 5.375 | 127.0 | 136.53 | 168.9 | 175 | 128.6 | 152.40 | 64 | 19.8 | 15.9 |
| 5.500 | 130.2 | 139.70 | 172.1 | 178 | 131.7 | 155.58 | 64 | 19.8 | 15.9 |
| 5.625 | 133.4 | 142.88 | 175.3 | 181 | 134.9 | 158.75 | 64 | 19.8 | 15.9 |
| 5.750 | 136.5 | 146.05 | 178.5 | 184 | 138.1 | 161.93 | 64 | 19.8 | 15.9 |
| 5.875 | 139.7 | 149.23 | 181.6 | 187 | 141.3 | 165.10 | 64 | 19.8 | 15.9 |
| 6.000 | 142.9 | 152.40 | 184.8 | 191 | \ | \ | 64 | \ | 15.9 |
- Chemical and petrochemical industries
- Industrial pump systems
- Mixers and agitators
- Corrosive fluid handling systems
- Oil & gas applications
- Heavy-duty rotating equipment