Marine and subsea slip rings
Moog Standard Marine and Winch Slip Rings
Sealed slip rings (models 129, 130, 159, 176 and 180) for winches in harsh marine service, carrying medium-voltage power to cable drums. Serve offshore oil and gas, oceanographic and seismic vessels.
Key specifications
| Current per circuit (max) | 125 A |
|---|---|
| Voltage (max) | 7,200 V |
| Speed (max) | 100 rpm |
| Outer diameter | 72.4–457 mm |
Summarised in our own words from Moog Inc.'s published data; series maxima, individual models vary. Last checked 2026-10-29. Source 1
Specify Motion is not affiliated with Moog Inc.. Moog and Standard Marine and Winch Slip Rings are used only to identify the product. Comparisons use published figures; always confirm against the current datasheet.
Alternatives that meet or exceed these figures
Engineers often come to us with a Moog part number and leave with an alternative that is easier to source, quicker to deliver or a better fit for the machine. These 3 series from our supply network are the closest match on published figures.
Heavy-duty carbon-brush slip rings for very high current and voltage, with copper-graphite power rings and precious-metal signal rings. Large and heavy by design, but straightforward to maintain.
| Published maximum | Standard Marine and Winch Slip Rings | BHR Series Frameless Type (Carbon Brush) |
|---|---|---|
| Circuits | — | 76 |
| Current per circuit | 125 A | 500 A meets or exceeds |
| Speed | 100 rpm | 10 rpm |
| Voltage | 7,200 V | 20,000 V meets or exceeds |
Fibre optic rotary joints that carry single-mode or multi-mode optical channels across rotation for high-bandwidth, interference-free data. Channel counts run from one to fifty.
| Published maximum | Standard Marine and Winch Slip Rings | FR Series Fiber Optic Rotary Joint |
|---|---|---|
| Current per circuit | 125 A | — |
| Speed | 100 rpm | 2,000 rpm meets or exceeds |
| Voltage | 7,200 V | — |
| Fibre channels | — | 50 |
RF rotary joints that carry microwave signals across rotation for antennas and radar, with one to five channels. Single-channel models run to 50 GHz.
| Published maximum | Standard Marine and Winch Slip Rings | RR Series Radio Frequency Rotary Joint |
|---|---|---|
| Current per circuit | 125 A | — |
| Speed | 100 rpm | 500 rpm meets or exceeds |
| Voltage | 7,200 V | — |
Figures are the highest published for each series and are not always measured the same way. A higher figure is not automatically a better choice: mounting, duty cycle, feedback, connectors and approvals matter too. An engineer will check the fit against your application before recommending anything.
What a marine and subsea slip ring is
A marine slip ring is a rotary joint built to survive salt air, spray, condensation and, for subsea versions, immersion and external pressure. The electrical design is conventional, with power, signal and data rings, but the housing uses corrosion-resistant materials such as stainless steel or marine-grade aluminium, robust shaft seals and suitable connectors. Subsea units are commonly oil-filled and pressure-compensated so internal pressure matches the surrounding water, which keeps seals working at depth.
When engineers choose a marine and subsea slip ring
Choose a marine design for deck winches, cranes, mooring and cable reels on ships and offshore platforms, and for ROVs and other subsea vehicles. A standard industrial unit in an enclosure is sometimes adequate in sheltered locations, but salt and condensation shorten life quickly. The trade-offs are size, weight, cost and lead time. For subsea work, compensated designs add complexity but avoid relying on seals to hold back full pressure. Fibre and high-voltage channels are often needed alongside power.
How to specify the Moog Standard Marine and Winch Slip Rings
Send these with your enquiry and an engineer can confirm the right Standard Marine and Winch Slip Rings variant or an equivalent:
- Location: deck, splash zone or subsea, with depth rating (m)
- Ingress protection (IP code) and pressure compensation method
- Housing and shaft materials
- Power circuits, current and voltage (A, V)
- Data or fibre channels
- Speed (rpm) and duty
- Connectors, glands and cable types
Common mistakes to avoid
- Using an industrial slip ring in a box on deck, where condensation forms inside
- Mixing metals that corrode galvanically in seawater
- Overlooking high-voltage clearance on winch slip rings feeding subsea power
- Not specifying compensation fluid and service intervals for oil-filled designs
Typical applications
Moog Standard Marine and Winch Slip Rings: frequently asked questions
What is the Moog Standard Marine and Winch Slip Rings?
Sealed slip rings (models 129, 130, 159, 176 and 180) for winches in harsh marine service, carrying medium-voltage power to cable drums. Serve offshore oil and gas, oceanographic and seismic vessels. Published series figures include current per circuit 125 A, voltage 7,200 V, speed 100 rpm, outer diameter 72.4 mm. It is made by Moog Inc.; Specify Motion can help source it or propose an equivalent.
Who makes the Moog Standard Marine and Winch Slip Rings?
The Moog Standard Marine and Winch Slip Rings is made by Moog (Moog Inc.) and is listed here for engineers comparing options. Specify Motion is not affiliated with Moog Inc.; brand names are used only to identify the product.
What is the current per circuit of the Moog Standard Marine and Winch Slip Rings?
The published series maximum current per circuit is 125 A. Individual models and sizes in the Standard Marine and Winch Slip Rings range vary, so check the exact variant against your duty cycle, mounting and environment, or ask our engineers to confirm the right size for you.
Is there an alternative to the Moog Standard Marine and Winch Slip Rings?
Yes. On published figures, BHR Series Frameless Type (Carbon Brush) and FR Series Fiber Optic Rotary Joint are the closest match from our supply network. An engineer confirms the fit against your application before recommending anything.
What does pressure-compensated mean for a subsea slip ring?
A pressure-compensated slip ring is filled with an insulating oil and linked to a flexible bladder or piston that lets the surrounding water pressure act on the oil. Inside and outside pressures stay nearly equal, so seals only have to keep fluid in, not resist full depth pressure. This is common for ROV and deep-water equipment because it makes depth rating far less dependent on wall thickness.
Is IP68 enough for a marine slip ring?
IP68 means protected against continuous immersion under conditions agreed by the manufacturer, so the actual depth and duration must be stated alongside it. It does not cover corrosion, UV, salt fog or pressure cycling. For deck equipment, specify materials and sealing for salt spray and condensation. For subsea, give the rated depth and test pressure, not just an IP code.
Further reading: Waterproof and subsea slip rings · How to select a slip ring · Slip rings
Other marine and subsea slip rings series
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