Through-bore slip rings
Moog Endura-Trac Fiber W Series through-bore slip ring
Modular fibre-brush through-bore slip ring scalable to a 9 inch bore with optional NEMA 12 sealing.
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.
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Need Moog parts, a replacement or another suitable option? Send your part number or describe what the machine needs to do. We connect your requirement with experienced UK engineering and procurement support to help you get the right products, pricing and supply options. Your matched provider can take the enquiry through quotation and ordering to delivery and after-sales support.
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What are you specifying?
Select everything you need. A motor, drive and gearbox can be specified together as one axis.
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.
Engineer support
Speak to our engineers about your project
Our experienced engineers are on hand, ready to help with your project. Whether you need the Moog Endura-Trac Fiber W Series itself, help sourcing it, or a modified or custom design built around your load, speed and space, tell us what the machine has to do and we'll come back with the right option.
- Help sourcing Endura-Trac Fiber W Series and spares for installed machines
- Modified and custom designs when a catalogue part doesn't fit
- Complete axis: motor, drive, gearing and feedback matched together
Typical applications
What a through-bore slip ring is
A through-bore slip ring is a rotary electrical joint built around a hollow centre, so a drive shaft, pneumatic or hydraulic line, fibre or cable bundle can pass straight through it. The rings are mounted on an insulated sleeve that fits over or around the machine shaft, and the brush blocks sit outside them in a stationary housing. Power, signal and data circuits are combined in one unit, while the bore keeps the rotation axis available for mechanics or services. Bore sizes range from a few millimetres to hundreds of millimetres.
When engineers choose a through-bore slip ring
Engineers choose a through-bore design when the axis of rotation is already occupied, typically by a shaft, a rotary union or a cable that must stay continuous. It is the standard choice for indexing tables, wrapping machines and turntables built around a central column. The trade-off is that larger rings mean higher surface speed, more brush wear and more drag torque at the same rpm, and the unit is bigger than a capsule. Where axial length is the constraint rather than diameter, a pancake design may suit better.
How to specify the Moog Endura-Trac Fiber W Series
Send these with your enquiry and an engineer can confirm the right Endura-Trac Fiber W Series variant or an equivalent:
- Bore diameter and shaft tolerance (mm)
- Outer diameter and length limits (mm)
- Circuit count and current per circuit (A)
- Working voltage and any high-voltage isolation (V)
- Speed, continuous and peak (rpm)
- Data or bus protocols to pass, such as Ethernet, CAN or PROFINET
- Sealing (IP code), temperature (°C) and mounting method
Common mistakes to avoid
- Sizing the bore to the shaft only, with no allowance for a rotary union or cables that must also pass
- Mounting the rotor hard on a shaft with radial runout and a separate stator fixing, so the unit is forced to align two axes
- Forgetting that surface speed rises with diameter, so the rated rpm is lower for larger bores
- Not stating which circuits need screening or twisted pairs for encoder and fieldbus signals
Moog Endura-Trac Fiber W Series: frequently asked questions
Can you help replace Moog Endura-Trac Fiber W Series 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 Endura-Trac Fiber W Series?
Modular fibre-brush through-bore slip ring scalable to a 9 inch bore with optional NEMA 12 sealing. Published series figures include circuits 76, current per circuit 30 A, voltage 600 V, speed 250 rpm. It is made by Moog Inc.; Specify Motion can help source it or propose an equivalent.
Who makes the Moog Endura-Trac Fiber W Series?
The Moog Endura-Trac Fiber W Series 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 circuits of the Moog Endura-Trac Fiber W Series?
The published series maximum circuits is 76. Individual models and sizes in the Endura-Trac Fiber W Series 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 Endura-Trac Fiber W Series?
We can assess suitable replacement options. Our engineers can review the original model and propose options for your load, speed and environment. An engineer confirms the fit against your application before recommending anything.
How do I choose the bore size for a through-bore slip ring?
Start with the shaft diameter and its tolerance, then add anything else that must pass through the centre, such as hoses, a rotary union stem or a fibre. Allow clearance for assembly and for the insulating sleeve. Larger bores raise surface speed, cost and drag torque, so pick the smallest bore that genuinely clears what has to pass through.
Can a through-bore slip ring carry Ethernet as well as power?
Yes. Many through-bore units combine power rings with signal rings designed for industrial Ethernet, using controlled impedance, twisted-pair routing and screening between groups. State the protocol and speed, typically 100 Mbit/s or gigabit, so the supplier can allocate suitable rings and keep them away from motor power. For very high data rates, a contactless or fibre channel may be added.
Further reading: How to select a slip ring · Ethernet through slip rings · Slip rings
Other through-bore slip rings series
Engineer support
Our engineers are ready to help with your project
Tell us about your project and how you use the Moog Endura-Trac Fiber W Series: the load, speed, duty and environment. An experienced engineer will review it and reply, normally within one working day.
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