Capsule slip ringsLegacy
Moog P Series capsule slip ring
Compact capsule slip ring with 2 to 8 circuits up to 14 A; now listed by Moog as an end-of-life legacy product.
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.
Moog lists this series as legacy. We can help with spares for installed machines, a migration to the replacement, or an alternative. Find a replacement.
UK engineering team · Product sourcing · Supply support
Get pricing, sourcing and replacement support
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.
- Source original parts or assess suitable alternatives
- Get pricing, lead times and a defined supply proposal
- One enquiry for components, complete axes and ongoing support
No obligation to buy. Choose the quick form below or use the full configurator on this page. Add what you know; an engineer can help with the details.
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Specify what you need instead of P Series
Select the products and performance you need. Our UK engineering team can use your specification to help source the right components, pricing and supply options. See your summary before adding contact details.
Already know the part number? Use the quick enquiry form. You can configure a requirement below without registering.
- 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
| Circuits (max) | 8 |
|---|---|
| Current per circuit (max) | 14 A |
| Voltage (max) | 240 V |
| Speed (max) | 600 rpm |
| Outer diameter | 31.7–31.7 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
Notes on this data
Dimensions converted from published inches. 400-600 rpm. Not for new designs.
Specify Motion is not affiliated with Moog Inc.. Moog and P 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 P 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 P 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 capsule slip ring is
A capsule slip ring is a compact, solid-centre rotary electrical joint that passes power and signals from a fixed frame to a rotating assembly. Precious-metal brushes, usually gold on gold, ride on a stack of small-diameter rings inside a sealed cylindrical housing, so surface speed, contact noise and wear all stay low. Because there is no bore, the unit sits on the axis of rotation, typically fixed by a flange at one end with flying leads leaving each side. Capsules carry many signal circuits and modest power in a very small envelope.
When engineers choose a capsule slip ring
Choose a capsule when the centre of the rotating axis is free and space is tight, as in camera heads, small turntables, sensor heads and robot wrists. Small rings give low drag torque, low electrical noise and long life, which suits analogue, encoder and low-level data signals. The trade-offs are current and access: power rings are typically limited to a few amps each, and nothing can pass through the middle. If a shaft, hose or cable must run along the axis, a through-bore design is the better fit.
How to specify the Moog P Series
Send these with your enquiry and an engineer can confirm the right P Series variant or an equivalent:
- Number of circuits, split into power, signal and data
- Current per circuit (A) and working voltage (V AC or DC)
- Maximum and continuous speed (rpm)
- Envelope: outer diameter and length (mm)
- Signal types: analogue, encoder, RS485, CAN, Ethernet or video
- Ingress protection (IP code) and temperature range (°C)
- Lead length, wire gauge and connector terminations
Common mistakes to avoid
- Pushing one ring past its current rating instead of paralleling two or more rings per conductor
- Mixing motor power and low-level signals on adjacent rings without screening or allocation planning
- Fixing the rotor rigidly to a shaft that runs out, so bearing loads go through the capsule
- Letting the leads act as the anti-rotation device instead of fitting a proper torque strap or pin
Moog P Series: frequently asked questions
Can you help replace Moog P 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 P Series?
Compact capsule slip ring with 2 to 8 circuits up to 14 A; now listed by Moog as an end-of-life legacy product. Published series figures include circuits 8, current per circuit 14 A, voltage 240 V, speed 600 rpm. It is made by Moog Inc.; Specify Motion can help source it or propose an equivalent.
Who makes the Moog P Series?
The Moog P 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 P Series?
The published series maximum circuits is 8. Individual models and sizes in the P 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 the Moog P Series still available?
Moog lists the P Series as legacy. We can help with spares for installed machines, a migration, or an equivalent from our supply network that meets the same published figures.
What is the difference between a capsule and a through-bore slip ring?
A capsule slip ring has no central hole and mounts on the end of the rotating axis, which keeps the rings small, drag torque low and life long. A through-bore slip ring has a hollow centre so a shaft, air line or cable can pass along the axis. At equal rpm, through-bore rings run at a higher surface speed and are larger, so choose by whether the axis is free.
How much current can a capsule slip ring carry?
Signal rings in a capsule typically carry well under an amp, while dedicated power rings are commonly rated at a few amps up to around 10 A depending on the design. For a heavier load, several rings are paralleled on one conductor, which uses up circuit count and length. If the machine needs tens of amps, a through-bore or purpose-built high-current unit is usually more practical.
Further reading: How to select a slip ring · How to specify a slip ring · Slip rings
Other capsule 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 P Series: the load, speed, duty and environment. An experienced engineer will review it and reply, normally within one working day.
- 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.
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From your enquiry to products, delivery and support
Specify Motion helps turn a part number or application into a purchasing enquiry. We provide recommendations and connect your requirement with a relevant engineering or procurement provider for product selection, pricing, sourcing and supply.
- Tell us what you needSend a code or configure the application, quantities and timing.
- Reach a relevant providerAccess experienced UK engineering input and a suitable procurement route.
- Review the quotationYour provider confirms the products, price, compatibility checks and supply terms.
- Order with delivery and support agreedConfirm delivery, warranty and after-sales arrangements with the contracting provider.
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