Pancake slip rings
PR/PSR Series Pancake Slip Ring
Flat, disc-style slip rings for machines with little axial height but room radially, available with or without a through hole. They pass power alongside signals such as USB, Ethernet, audio and video.
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 Motion Control Products 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.
- Original parts or a checked alternative
- Pricing, lead time and delivery in one reply
- Components, complete axes and ongoing support
No obligation. Add what you know and an engineer will help with the rest. Prefer to configure it? Build a specification.
Spec builder
Configure PR/PSR Series Pancake Slip Ring
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
| Circuits (max) | 30 |
|---|---|
| Current per circuit (max) | 20 A |
| Voltage (max) | 380 V |
| Speed (max) | 100 rpm |
| Bore | 0–500 mm |
| Ingress protection | IP51 (PR); IP00 (PSR) |
| Temperature | -20–60 °C |
| Data / bus | USB, Ethernet, audio, video, RS |
| Rated life (revolutions) | 10,000,000 |
| Thickness | 6–51 |
Series ranges as published; individual models vary. The full datasheet, drawings and CAD models are available on request.
Options
- with or without through hole
- high-vacuum sealing
- precious metal brushes
- tin-coated Teflon leads
Typical applications
What a pancake slip ring is
A pancake slip ring, sometimes called a platter or flat slip ring, arranges its rings as concentric circles on a flat disc rather than as a stack along a shaft. Brushes press axially onto the face of the disc. This makes the assembly very short along the axis, often only a few tens of millimetres, at the cost of a larger diameter as circuits are added. Most pancake designs also have a central bore, so a shaft or services can pass through the middle.
When engineers choose a pancake slip ring
Choose a pancake design when axial height is the tightest constraint, such as in low-profile turntables, medical tables, rotary platforms under a payload or equipment mounted against a bulkhead. The trade-offs are circuit count and speed: each extra ring adds diameter, outer rings run at higher surface speed and the flat face is more exposed to debris. For many circuits in a modest diameter, a barrel-type through-bore unit is usually more economical. Speed ratings are typically lower than for capsules.
How to specify the PR/PSR Series Pancake Slip Ring
Send these with your enquiry and an engineer can confirm the right PR/PSR Series Pancake Slip Ring variant:
- Maximum axial height and outer diameter (mm)
- Bore diameter (mm)
- Number of circuits and current per circuit (A)
- Voltage between adjacent rings (V)
- Speed (rpm)
- Contamination exposure and sealing (IP code)
- Orientation: horizontal or vertical axis
Common mistakes to avoid
- Asking for many circuits in a pancake format, which drives diameter and cost up quickly
- Ignoring axial runout of the mounting face, which changes brush pressure around the turn
- Leaving the ring face exposed to dust or swarf without a cover
- Specifying high speed without checking the surface speed of the outermost ring
PR/PSR Series Pancake Slip Ring: frequently asked questions
Can you help replace PR/PSR Series Pancake Slip Ring 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 PR/PSR Series Pancake Slip Ring?
Flat, disc-style slip rings for machines with little axial height but room radially, available with or without a through hole. They pass power alongside signals such as USB, Ethernet, audio and video. Published series figures include circuits 30, current per circuit 20 A, voltage 380 V, speed 100 rpm. It is available through our supply network, and our engineers can confirm the right variant for your application.
Who makes the PR/PSR Series Pancake Slip Ring?
The PR/PSR Series Pancake Slip Ring is part of a range available through our supply network. Send us your requirement for pricing, lead time, datasheets and CAD.
What is the circuits of the PR/PSR Series Pancake Slip Ring?
The published series maximum circuits is 30. Individual models and sizes in the PR/PSR Series Pancake Slip Ring 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.
When is a pancake slip ring better than a barrel slip ring?
A pancake slip ring wins when there is very little axial space but room to spread out radially, such as under a flat turntable. A barrel or through-bore design wins when you need many circuits, higher speed or a smaller diameter. If both length and diameter are tight, the circuit count usually has to be reduced or some signals multiplexed onto a data channel.
Do pancake slip rings have a lower speed rating?
Often, yes. Because the rings sit at different radii, the outermost ring runs at the highest surface speed, and the flat face makes brush dynamics more sensitive to axial runout. Pancake designs are typically used at modest speeds. If the application turns quickly, check the rated rpm against the largest ring and consider a barrel design instead.
Further reading: How to select a slip ring · Slip rings
Often compared with
Engineers specifying this series often compare it with:
Engineer support
Need PR/PSR Series Pancake Slip Ring or a complete system around it?
Tell us the part or application, quantity and timing. Our UK engineers will come back with the right product, pricing, lead time and delivery.
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- 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.