Through-bore slip rings
Moog Endura-Trac Fiber W Series
Modular fibre-brush through-bore slip ring scalable to a 9 inch bore with optional NEMA 12 sealing.
Key specifications
| Circuits (max) | 76 |
|---|---|
| Current per circuit (max) | 30 A |
| Voltage (max) | 600 V |
| Speed (max) | 250 rpm |
| Bore | 38.1–228.6 mm |
| Outer diameter | 127–317.5 mm |
| Ingress protection | NEMA 12 (optional) |
| Temperature | -40–80 °C |
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
Up to 28 power (30 A) + 48 signal (5 A); circuits_max is the sum. Product guide states power to 24.
Specify Motion is not affiliated with Moog Inc.. Moog and Endura-Trac Fiber W Series 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 series from our supply network is the closest match on published figures.
Through-bore slip rings with a hollow centre so shafts, pipes or cables can pass through, carrying power, signal and fieldbus data. Standard bores run from 12.7 mm to 100 mm and custom bores are offered.
| Published maximum | Endura-Trac Fiber W Series | ER Series Through Bore Slip Ring |
|---|---|---|
| Circuits | 76 | 24 |
| Current per circuit | 30 A | 15 A |
| Speed | 250 rpm | 300 rpm meets or exceeds |
| Voltage | 600 V | 380 V |
| Bore | 228.6 mm | 100 mm |
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 through-bore slip rings series
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