Marine and subsea slip rings
Moog Model 159 marine and subsea slip ring
Winch slip ring with 60 A passes and up to 1,000 A total current at 7.2 kV.
Need this part, a replacement or a complete package? Our experienced UK engineering team helps you select, source and obtain the right products, with pricing, delivery coordination and after-sales support.
Pricing and availability
Get pricing, sourcing and replacement support
Need Moog parts, a replacement or a suitable alternative? Send us a part number, or tell us what the machine needs to do. Our UK engineers will come back with the right product, pricing, lead time and delivery, whether that is the original part, a checked alternative or a complete axis.
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- Pricing, lead time and delivery in one reply
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No obligation. Add what you know and an engineer will help with the rest. Prefer to configure it? Build a specification.
Spec builder
Specify what you need instead of Model 159
Select every part you need and answer the questions an applications engineer would ask. Our engineers use your specification to come back with the right products, pricing and lead times. You see your summary before we ask for any details.
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- 1Products
- 2Performance
- 3Environment
- 4Volumes
- 5Your spec
What are you specifying?
Select everything you need. A motor, drive and gearbox can be specified together as one axis.
Key specifications
| Current per circuit (max) | 60 A |
|---|---|
| Voltage (max) | 7,200 V |
| Speed (max) | 50 rpm |
Summarised in our own words from Moog Inc.'s published data; series maxima, individual models vary. Last checked 2026-10-29. Source 1 · Source 2 · Source 3
Notes on this data
OD inconsistent on web page (6.62 in / 219 mm) and guide (8.5 in) — not entered.
Specify Motion is not affiliated with Moog Inc.. Moog and Model 159 are used only to identify the product. Comparisons use published figures; always confirm against the current datasheet.
Moog Model 159 replacement and alternative options
Use these supply-network options as a starting point for an engineering check. We can also help source the original Moog part. Published series figures do not establish an exact-model or drop-in replacement: confirm ratings, fit, interfaces and approvals for your application.
Flameproof (Ex d IIB T4 Gb) slip rings for gas hazardous areas, Zones 1 and 2, in oil, gas and chemical plant.
| Published maximum | Model 159 | Explosion-proof Slip Ring (ER-EX) |
|---|---|---|
| Circuits | — | 17 |
| Current per circuit | 60 A | 100 A meets or exceeds |
| Speed | 50 rpm | 50 rpm meets or exceeds |
| Voltage | 7,200 V | — |
| Bore | — | 180 mm |
Gold-contact slip rings for uncompressed HD video (HDMI, SDI) mixed with USB, Ethernet, RF and RS422, rated for 1080P at 60Hz and beyond.
| Published maximum | Model 159 | High Definition (HD) Slip Ring |
|---|---|---|
| Circuits | — | 32 |
| Current per circuit | 60 A | 60 A meets or exceeds |
| Speed | 50 rpm | 250 rpm meets or exceeds |
| Voltage | 7,200 V | — |
| Bore | — | 38.1 mm |
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 | Model 159 | FR Series Fiber Optic Rotary Joint |
|---|---|---|
| Current per circuit | 60 A | — |
| Speed | 50 rpm | 2,000 rpm meets or exceeds |
| Voltage | 7,200 V | — |
| Fibre channels | — | 50 |
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.
Typical applications
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 Model 159
Send these with your enquiry and an engineer can confirm the right Model 159 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
Moog Model 159: frequently asked questions
Can you help replace Moog Model 159 or source the original?
Send the full model code, quantity and required date. Our engineers can check original-part availability and assess suitable alternatives, including supply-network options where appropriate. We confirm compatibility and any changes needed before recommending a replacement.
What is the Moog Model 159?
Winch slip ring with 60 A passes and up to 1,000 A total current at 7.2 kV. Published series figures include current per circuit 60 A, voltage 7,200 V, speed 50 rpm. It is made by Moog Inc.; Specify Motion can help source it or propose an equivalent.
Who makes the Moog Model 159?
The Moog Model 159 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 Model 159?
The published series maximum current per circuit is 60 A. Individual models and sizes in the Model 159 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 Model 159?
We can assess suitable replacement options. On published figures, Motion Control Products Explosion-proof Slip Ring (ER-EX) and Motion Control Products High Definition (HD) Slip Ring are options to assess 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
Engineer support
Let our experienced engineers do the hard work for you
Tell us how you use the Moog Model 159: the load, speed, duty and environment. Our engineers will confirm whether it is still the right part, find it for you, or propose an alternative that fits better.
- Reviewed by an engineer, not an autoresponder
- Like-for-like and better-fit alternatives
- Standard, modified and custom options
Prefer to configure it? Use the spec builder.
How it works
From enquiry to delivery
Send a part number or describe the application. Our engineers take it from there: the right product, a clear quotation, and delivery and support arranged.
- 01Tell us what you needSend a part number, or configure the application, quantities and timing.
- 02An engineer reviews itWe check the specification and find the original part, a checked equivalent or a complete axis.
- 03Receive your quotationProducts, pricing, lead time and compatibility notes in one reply.
- 04Order and deliveryWhen you are happy, the order is placed and delivery and after-sales support are arranged.