SKF MD55X39X18.4-L Hydraulic piston seal
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Product Description
SKF MD55X39X18.4-L hydraulic piston seal. Hydraulic cylinder piston seal — single-acting or double-acting execution. Materials cover filled PTFE, polyurethane, NBR / HNBR elastomer with anti-extrusion back-up ring. Groove dimensions per ISO 7425-1. Standard temperature range -30 to +110 °C for elastomer, -30 to +200 °C for PTFE. Suitable for marine hydraulic winches, deck cranes, steering-gear rams, hatch-cover actuators.
Technical Specifications
- Type
- Hydraulic piston seal
- Designation
- SKF MD55X39X18.4-L
- HS code
- 4016.93
- Cylinder bore diameter
- 55 mm
- Piston groove diameter
- 39 mm
- Piston groove width
- 18.4 mm
- Pressure limit, maximum
- 25 N/mm²
- Design
- MD-L
- Primary sealing element
- NBR
- Compound 2
- POM
- Compound 3
- TPE
- Unit system
- Metric
- Product net weight
- 0.0305 kg
- eClass code
- 23-07-01-90
- UNSPSC code
- 31181602
Standards & Compliance
- Standard
- SKF designation convention (see description for governing ISO / DIN)
- Material
- As declared by SKF designation suffix
- Temperature Range
- Per SKF product data
- HS Code
- 4016.93
Cross References
- Trelleborg 5539184
- Parker 5539184
- Freudenberg 5539184
- Hallite 5539184
- Equivalent: 5539184 (Trelleborg)
- Equivalent: 5539184 (Parker)
- Equivalent: 5539184 (Freudenberg)
- Equivalent: 5539184 (Hallite)
Compatibility & Fitment
Interchange with peer OEM equivalents on identical boundary plan and execution — confirm cage, clearance, sealing and precision-class suffix before substitution.
Product Documentation
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Technical guides
- Hydraulic Seal Size Finder — Rod Seals, Buffer Seals, Piston Seals, Wipers and Guide Rings by Rod / Bore and Groove Dimensions (SKF)
- SKF 81xxx Cylindrical Roller Thrust Bearing — Dimensions, Load Ratings & Interchange (81102 to 81140)
- SKF Deep Groove Ball Bearing Reference — 6000 / 6200 / 6300 / 6400 Series (Dimensions, Load Ratings, Interchange to FAG NSK NTN Timken)
Catalogue entry last verified: 2026-08-13. A manufacturer datasheet is attached to this entry — confirm application-critical values against it.
Frequently asked questions
- Where can I buy MD55X39X18.4-L?
- MD55X39X18.4-L can be ordered from cballast.com as a SKF catalogue item: request a quotation on this page or email sales@cballast.com, and the order ships worldwide.
- What is the manufacturer part number for this SKF product?
- The manufacturer part number is MD55X39X18.4-L.
- What is the HS code for MD55X39X18.4-L?
- The customs tariff (HS) code for MD55X39X18.4-L is 4016.93.
- Who manufactures MD55X39X18.4-L?
- MD55X39X18.4-L is a SKF product in the Seals & Gaskets range.
- Is a datasheet available for MD55X39X18.4-L?
- Yes — the MD55X39X18.4-L datasheet can be viewed and downloaded on this page.
- What is the minimum order quantity for MD55X39X18.4-L?
- The minimum order quantity is 1.
- Is MD55X39X18.4-L available?
- Yes — MD55X39X18.4-L is available to order: fulfilment is from supplier stock in cBallast's European network, dispatched directly from the warehouse to the customer, with the exact lead time stated in the quotation (reply within 24 hours).