Thaimart SEALTHAI
SEALTHAI / HYDRAULIC SEALING
Compact
Piston Seal DAS
DAS 250-220 is a compact piston seal assembly for double-acting hydraulic cylinders. The supplied dimensional image specifies 250 × 220 × 35.4 mm. Match the groove, cross-section and operating conditions before selecting a replacement.
- OD / Outer
- 250 mm
- ID / Inner
- 220 mm
- THK / Thickness
- 35.4 mm
Compact sealing for hydraulic pistons
Assembly concept
The compact arrangement combines sealing, support and guiding components. It is intended for consideration in cylinders pressurized from either side. A complete groove comparison makes replacement decisions more reliable.
Inspect the cylinder and piston as well as the old seal. Replacing a seal alone may not resolve leakage caused by damaged sliding surfaces.
Selection priorities
- Industrial hydraulic cylinder maintenance
- Double-acting piston applications
- Verified groove dimensions and cross-section
- Fluid, temperature, pressure and speed compatibility
The name DAS does not define every installation dimension across all suppliers.
Technical data
The illustrated brochure lists the following reference values. Confirm the material grade of the supplied assembly before design or installation.
| Material | Brochure code | Max. pressure | Temperature | Max. sliding speed |
|---|---|---|---|---|
| NBR | NB8001 | 400 bar | −30 to +100 °C | 0.5 m/s |
| TPE | TP7301 | 400 bar | −30 to +100 °C | 0.5 m/s |
| POM | PM9901 | 400 bar | −30 to +100 °C | 0.5 m/s |
The brochure values align with the manufacturer's Kastaş K18 material table. This comparison does not establish the brand of the illustrated product or simultaneous operation at all maximum values.
The illustration uses OD × ID × THK: 250 × 220 × 35.4 mm. An ID-first listing would read 220 × 250 × 35.4 mm. Also confirm which part of the assembly or installation groove the width refers to.
Check before replacing the seal
Send the identification details
- Photograph the complete old seal from the front and side.
- Measure and label OD, ID and thickness.
- Measure the piston groove and compare the cross-section.
- Specify fluid, temperature, pressure and operating speed.
- Include the machine nameplate and original part number if available.
Prepare for assembly
A qualified technician should isolate energy and release pressure according to the machine service procedure. Inspect groove cleanliness, edges and sliding surfaces.
Surface finish, clearances, lead-in chamfers and tolerances must follow the actual seal and cylinder drawings. The brochure sketch is not a production drawing for every machine.
Choose the right purchasing route
| Approach | Timing and cost | Durability and limitations |
|---|---|---|
| Match DAS against the old assembly and drawing | Quote after dimensions are confirmed | Depends on materials, cylinder condition and installation |
| Order an OEM kit by part number | Confirm price and lead time with the machine supplier | Match serial number and cylinder position |
Brochure and groove reference
Use illustrations alongside actual measurements
The brochure introduces the compact assembly and groove concept. The dimensional image communicates the nominal 250 × 220 × 35.4 mm size.
If the old seal is worn or distorted, cross-check the cylinder drawing instead of relying exclusively on the damaged part.
Explore hydraulic seals
KDAS piston seal information
SEALTHAI selection guides
Send the dimensions to SEALTHAI
Quote “DAS 250 × 220 × 35.4 — OD × ID × THK” with seal and nameplate photos. For an MC15 / Borche 260T inquiry, add the full machine model and cylinder identification so the assembly can be checked before quotation.