Category
K81 Hydraulic static seals
K81 back-up rings are sealing elements that are generally used behind the o-ring in order to ensure system security and minimize extrusion gaps in many applications.
Advantages
- Extrusion resistance in larger gap clearance
- Easy installation
- Can be used at high pressure
- Wide range of dimensions
Area of Application
- Agricultural machinery
- Construction machinery
- Loading platforms
- Injection moulding machines
- Forklifts
- Standard industrial cylinders
In this catalog
197 K81 parts, bore 6–316 mm across 159 sizes. Most common section heights: 1.3 mm (48), 1.9 mm (45), 1.5 mm (24).
Same bore, other series
If a K81 size is not the right profile, these cover the same ID/OD combinations:
197 parts in catalog
Technical table
Live column filters for code, category, ID, OD and H — same workflow as the store.
197 parts
| Image | Code (SKU) | Category | ID (d) | OD (D) | H (L) | Action |
|---|---|---|---|---|---|---|
 | K81-006 | K81 | 6 | 12 | 2 | |
| K81-012 | K81 | 12 | 16 | 1.2 | |
| K81-014 | K81 | 14 | 18 | 1.3 | |
| K81-016/1 | K81 | 16.4 | 20 | 1.3 | |
| K81-019 | K81 | 19 | 23 | 1.3 | |
| K81-020 | K81 | 20 | 25 | 1.3 | |
| K81-020/1 | K81 | 20 | 30 | 1.3 | |
| K81-022 | K81 | 22 | 28 | 1.5 | |
| K81-025 | K81 | 25.4 | 30 | 1.9 | |
| K81-025/1 | K81 | 25 | 30 | 1.3 | |
| K81-026 | K81 | 26 | 30 | 2 | |
| K81-027 | K81 | 27 | 32 | 1.3 | |
| K81-028 | K81 | 28.2 | 34.6 | 1.3 | |
| K81-029 | K81 | 29.8 | 35 | 1 | |
| K81-030 | K81 | 30 | 35 | 1.3 | |
| K81-034 | K81 | 34.68 | 39.68 | 1.75 | |
| K81-034/1 | K81 | 34.5 | 40 | 1.5 | |
| K81-035 | K81 | 35 | 40 | 1.3 | |
| K81-036 | K81 | 36 | 40.5 | 1.25 | |
| K81-036/1 | K81 | 36 | 40 | 1.8 | |
| K81-037 | K81 | 37 | 42 | 1.3 | |
| K81-038 | K81 | 38 | 43 | 1.3 | |
| K81-038/1 | K81 | 38.3 | 47.8 | 1.3 | |
| K81-040 | K81 | 40 | 45 | 1.3 | |
| K81-040/1 | K81 | 40.4 | 45 | 1.9 | |
| K81-040/2 | K81 | 40.7 | 45 | 1.3 | |
| K81-041 | K81 | 41 | 45.5 | 1.25 | |
| K81-043 | K81 | 43 | 48 | 1.3 | |
| K81-043/1 | K81 | 43.7 | 50 | 1.9 | |
| K81-044 | K81 | 44.3 | 50.5 | 1.3 | |
| K81-044/1 | K81 | 44.5 | 50 | 1.5 | |
| K81-045 | K81 | 45 | 50 | 1.3 | |
| K81-045/3 | K81 | 45 | 49.5 | 1.5 | |
| K81-045/4 | K81 | 45 | 55 | 1.5 | |
| K81-045/5 | K81 | 45 | 52 | 1.5 | |
| K81-046 | K81 | 46 | 50.5 | 1.25 | |
| K81-047 | K81 | 47 | 52 | 1.3 | |
| K81-047/1 | K81 | 47 | 51.5 | 1.5 | |
| K81-048 | K81 | 48 | 54 | 1.5 | |
| K81-049 | K81 | 49.3 | 55 | 1.3 | |
| K81-049/1 | K81 | 49 | 55 | 2.5 | |
| K81-050 | K81 | 50 | 55 | 1.3 | |
| K81-050/2 | K81 | 50 | 60 | 1.7 | |
| K81-050/3 | K81 | 50.6 | 60 | 1.7 | |
| K81-052 | K81 | 52 | 60 | 1.9 | |
| K81-053 | K81 | 53.7 | 60 | 1.9 | |
| K81-053/1 | K81 | 53 | 63 | 1.7 | |
| K81-053/3 | K81 | 53 | 59 | 1.5 | |
| K81-055 | K81 | 55 | 63 | 1.9 | |
| K81-055/1 | K81 | 55.7 | 60 | 1.3 |
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