Marine and subsea slip rings
Moog Model 129
High-power winch slip ring for marine handling systems, rated to 7.2 kV.
Key specifications
| Current per circuit (max) | 125 A |
|---|---|
| Voltage (max) | 7,200 V |
| Speed (max) | 50 rpm |
| Outer diameter | 324–324 mm |
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
Web page 125 A/pass, 7200 VAC, 12.75 in OD; product guide 175 A, 5,000 VAC, 15.5 in (web used). No through bore.
Specify Motion is not affiliated with Moog Inc.. Moog and Model 129 are used only to identify the product. Comparisons use published figures; always confirm against the current datasheet.
Typical applications
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 | Model 129 | BHR Series Frameless Type (Carbon Brush) |
|---|---|---|
| Circuits | — | 76 |
| Current per circuit | 125 A | 500 A meets or exceeds |
| Speed | 50 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 | Model 129 | FR Series Fiber Optic Rotary Joint |
|---|---|---|
| Current per circuit | 125 A | — |
| Speed | 50 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 | Model 129 | RR Series Radio Frequency Rotary Joint |
|---|---|---|
| Current per circuit | 125 A | — |
| Speed | 50 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.
Other marine and subsea slip rings series
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