Comparison: Reinforced COMBI Seal and Cassette Seal For Dust Contamination Prevention

Customer problem: Cassette and COMBI designs solve similar contamination problems, but packaging, shaft condition and service needs differ.

Practical solution: COMBI seals offer a compact integrated barrier, while cassette designs may suit applications needing a dedicated running surface.

Problem-Solving Benefits

• Clarifies COMBI and cassette use cases

• Supports packaging-based selection

• Avoids over- or under-specifying the seal

Recommended application: applications comparing compact COMBI and cassette sealing solutions.

40 Product Attributes

1. Type: reinforced COMBI rotary shaft seal

2. Primary function: dust exclusion

3. Secondary function: oil or grease retention

4. Structure: integrated combination seal

5. Lips: dedicated dust and oil lips

6. Barrier: contact plus labyrinth stages

7. Contaminants: dust, grit, sand, mud, residue

8. Motion: rotary shaft

9. Rotation: bidirectional or reversing

10. Duty: heavy and continuous

11. Case: rigid metal shell

12. Reinforcement: roundness and alignment support

13. Mounting: housing press fit

14. OD: rubber-covered or metal-cased

15. Elastomers: NBR, HNBR or FKM

16. Metal: carbon or stainless steel options

17. Spring: optional garter spring

18. Hardness: application-selectable

19. Temperature: compound-dependent

20. Speed: shaft-size and rpm dependent

21. Pressure: non-pressurized or low pressure

22. Shaft size: custom metric or inch

23. Housing bore: custom to drawing or sample

24. Width: customizable

25. Tolerance: controlled interference fit

26. Shaft finish: fine and lead-free

27. Runout: within equipment limits

28. Lubrication: compatible oil or grease

29. Abrasion resistance: dusty-duty option

30. Corrosion resistance: material-selectable

31. Water exposure: splash and wet-mud resistant

32. Vibration: reinforced fit

33. Impact protection: shielded lip layout

34. Orientation: dust lip faces contamination

35. Tooling: flat full-case driver

36. Maintenance: inspect debris and lubricant

37. Failures reduced: lip wear, shaft scoring, dirty bearings

38. Customization: size, compound, case, spring, lips

39. Quality control: dimensions, appearance, lip integrity

40. Applications: axles, hubs, gearboxes, final drives

Selection Guidance

Choose a reinforced COMBI seal when compact multi-stage exclusion and lubricant retention are needed. Consider a cassette design when the assembly benefits from an integrated running surface. Confirm shaft condition, space, speed, media and contamination severity.