Oil seals
17 products
| Product | Part number | Inner dia. (mm) | Outer dia. (mm) | Thickness (mm) | Material | Lip configuration | Unit price (VND) |
|---|---|---|---|---|---|---|---|
| Oil seal TC 12x25x7 NBR | OS0001 | 12 mm | 25 mm | 7 mm | NBR | TC, double lip with spring | 18,000 |
| Oil seal TC 15x30x7 NBR | OS0002 | 15 mm | 30 mm | 7 mm | NBR | TC, double lip with spring | 19,000 |
| Oil seal TC 17x35x7 NBR | OS0003 | 17 mm | 35 mm | 7 mm | NBR | TC, double lip with spring | 22,000 |
| Oil seal TC 20x35x7 NBR | OS0004 | 20 mm | 35 mm | 7 mm | NBR | TC, double lip with spring | 23,000 |
| Oil seal TC 20x40x7 NBR | OS0005 | 20 mm | 40 mm | 7 mm | NBR | TC, double lip with spring | 25,000 |
| Oil seal TC 25x40x7 NBR | OS0006 | 25 mm | 40 mm | 7 mm | NBR | TC, double lip with spring | 26,000 |
| Oil seal TC 25x47x7 NBR | OS0007 | 25 mm | 47 mm | 7 mm | NBR | TC, double lip with spring | 29,000 |
| Oil seal TC 30x47x7 NBR | OS0008 | 30 mm | 47 mm | 7 mm | NBR | TC, double lip with spring | 31,000 |
| Oil seal TC 30x52x7 NBR | OS0009 | 30 mm | 52 mm | 7 mm | NBR | TC, double lip with spring | 34,000 |
| Oil seal TC 35x55x8 NBR | OS0010 | 35 mm | 55 mm | 8 mm | NBR | TC, double lip with spring | 39,000 |
| Oil seal TC 40x62x8 NBR | OS0011 | 40 mm | 62 mm | 8 mm | NBR | TC, double lip with spring | 46,000 |
| Oil seal TC 45x65x8 NBR | OS0012 | 45 mm | 65 mm | 8 mm | NBR | TC, double lip with spring | 52,000 |
| Oil seal TC 50x72x8 NBR | OS0013 | 50 mm | 72 mm | 8 mm | NBR | TC, double lip with spring | 61,000 |
| Oil seal TC 55x80x10 NBR | OS0014 | 55 mm | 80 mm | 10 mm | NBR | TC, double lip with spring | 78,000 |
| Oil seal TC 25x47x7 FKM | OS0015 | 25 mm | 47 mm | 7 mm | FKM | TC, double lip with spring | 118,000 |
| Oil seal TC 35x55x8 FKM | OS0016 | 35 mm | 55 mm | 8 mm | FKM | TC, double lip with spring | 152,000 |
| Oil seal TC 50x72x8 FKM | OS0017 | 50 mm | 72 mm | 8 mm | FKM | TC, double lip with spring | 240,000 |
Frequently asked questions
How do I read the designation TC 25x47x7?
The three numbers are the shaft diameter 25 mm, the housing bore 47 mm and the seal width 7 mm. TC is a rubber-covered outer case with a spring-loaded main lip and an extra dust lip. KIT's TC seal codes follow this order, for example TC 25x47x7 NBR.
The old seal is worn. How do I measure for a replacement?
Measure the shaft and the housing bore with callipers rather than the old seal, because the lip wears and the case may be distorted. Measure the width across the case, not the lip. If the shaft has a deep wear groove where the lip ran, the new seal can be set a few millimetres further in, or a shaft sleeve can be used.
When should I switch from NBR to FKM?
NBR works well with mineral oil up to about 100 °C. When oil temperature regularly exceeds that, with synthetic or heavily additised oils, or when high shaft surface speed heats the lip, FKM keeps the lip from hardening and cracking. Some TC codes come in both materials at the same size, for example 25x47x7 and 35x55x8.
Can I replace an NOK or SKF seal with an equivalent?
Yes, provided the three dimensions and the lip type match. On each product page KIT lists equivalent codes from NOK, NAK, SKF, each with its level of equivalence: exact when the seal type designation and dimensions are the same, functional when the case or lip design differs slightly but the part is still interchangeable.
Why does a newly fitted seal leak after a few days?
Common causes are fitting it the wrong way round (the spring must face the oil), cutting the lip on a keyway or thread, and driving it in crooked. Oil the lip, use a fitting sleeve over sharp edges and press it in with a flat driver. A scored shaft or excessive runout will also leak even with the correct seal.
What shaft surface does an oil seal need to last?
The area under the lip should have a roughness of about Ra 0.2 to 0.8 µm, a hardness of 45 HRC or more, and be plunge ground without lead marks. A shaft that is too smooth starves the lip of oil film so it burns, while one that is too rough wears the lip quickly. Once the shaft has a wear groove, a shaft repair sleeve can be used instead of remachining the whole shaft.
When do I need a seal with an extra dust lip?
A TC type seal has an unsprung auxiliary lip facing outwards, used where dust, sand, steam or washdown water reach the shaft. An SC type has only one lip and suits enclosed gearboxes in clean workshops. Pack a little grease under the dust lip on fitting so it does not run dry.
How much pressure can an oil seal take?
A standard oil seal is designed for near atmospheric pressure, typically about 0.5 bar at most. When the oil chamber is pressurised, the lip is forced hard against the shaft, heats up and wears quickly. Hydraulic pumps and motors with case pressure need a pressure type seal with a short, supported lip, or a pressure relief port.
