Open and frameless slip rings
Rotary Systems Separates (SR001–SR012) open and frameless slip ring
Separate rotor and brush-block slip rings for building into a machine, 3 to 10 A at 150 to 210 V DC, with silver or gold contacts and bores from 0.59 to 4.75 in (15 to 121 mm).
Key specifications
| Current per circuit (max) | 10 A |
|---|---|
| Voltage (max) | 210 V |
| Bore | 15–120.7 mm |
| Contacts | silver or gold |
Summarised in our own words from Rotary Systems Inc.'s published data; series maxima, individual models vary. Last checked 2026-10-30. Source 1
Notes on this data
Bores converted from inches.
Specify Motion is not affiliated with Rotary Systems Inc.. Rotary Systems and Separates (SR001–SR012) 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 Rotary Systems 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.
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 maximum | Separates (SR001–SR012) | PR/PSR Series Pancake Slip Ring |
|---|---|---|
| Circuits | — | 30 |
| Current per circuit | 10 A | 20 A meets or exceeds |
| Speed | — | 100 rpm |
| Voltage | 210 V | 380 V meets or exceeds |
| Bore | 120.7 mm | 500 mm meets or exceeds |
Sealed slip rings rated IP64 to IP68 for wet, washdown and marine settings such as ships and harbour equipment.
| Published maximum | Separates (SR001–SR012) | Waterproof Slip Ring |
|---|---|---|
| Circuits | — | 44 |
| Current per circuit | 10 A | 85 A meets or exceeds |
| Speed | — | 600 rpm |
| Voltage | 210 V | 1,100 V meets or exceeds |
| Bore | 120.7 mm | 127 mm meets or exceeds |
Large through-hole slip rings for heavy outdoor plant, with through holes quoted up to 1000 mm and long service life.
| Published maximum | Separates (SR001–SR012) | Large Size Slip Ring |
|---|---|---|
| Circuits | — | 35 |
| Current per circuit | 10 A | 50 A meets or exceeds |
| Voltage | 210 V | 500 V meets or exceeds |
| Bore | 120.7 mm | 1,000 mm meets or exceeds |
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.
What an open and frameless slip ring is
An open or frameless slip ring is supplied as separate components, typically a ring assembly and one or more brush blocks, without its own housing or bearings. The machine builder mounts the rings on the rotating part and the brushes on the stationary frame, using the machine's own bearings to locate them. This lets the slip ring fit around large shafts, inside existing housings or in very short axial spaces. Designs range from precious-metal signal rings to heavy copper rings with carbon brushes for high current.
When engineers choose an open and frameless slip ring
Choose a frameless design when a housed unit will not fit, when the bore is very large or when the machine already has stiff bearings and a protected space to house the rings. It saves weight and length and avoids a second set of bearings fighting the machine's. The trade-offs are responsibility and risk: concentricity, runout, brush preload, sealing and contamination control all move to the machine builder. Plan assembly, setting and inspection procedures carefully.
How to specify the Rotary Systems Separates (SR001–SR012)
Send these with your enquiry and an engineer can confirm the right Separates (SR001–SR012) variant or an equivalent:
- Ring inner and outer diameter and stack length (mm)
- Permitted runout and axial float of the machine (mm)
- Number of circuits, current and voltage (A, V)
- Brush type and number of brushes per ring
- Speed (rpm) and expected life
- Environment inside the machine: dust, oil, humidity
- How the brush block is located and adjusted
Common mistakes to avoid
- Leaving runout and concentricity tolerances undefined between ring and brush block
- Installing rings where oil mist or swarf can reach the contacts
- Not designing an anti-rotation method for the ring assembly on its shaft
- Omitting an assembly and setting procedure for the brush preload
Rotary Systems Separates (SR001–SR012): frequently asked questions
What is the Rotary Systems Separates (SR001–SR012)?
Separate rotor and brush-block slip rings for building into a machine, 3 to 10 A at 150 to 210 V DC, with silver or gold contacts and bores from 0.59 to 4.75 in (15 to 121 mm). Published series figures include current per circuit 10 A, voltage 210 V, bore 15 mm, bore 120.7 mm. It is made by Rotary Systems Inc.; Specify Motion can help source it or propose an equivalent.
Who makes the Rotary Systems Separates (SR001–SR012)?
The Rotary Systems Separates (SR001–SR012) is made by Rotary Systems (Rotary Systems Inc.) and is listed here for engineers comparing options. Specify Motion is not affiliated with Rotary Systems Inc.; brand names are used only to identify the product.
What is the current per circuit of the Rotary Systems Separates (SR001–SR012)?
The published series maximum current per circuit is 10 A. Individual models and sizes in the Separates (SR001–SR012) 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 Rotary Systems Separates (SR001–SR012)?
Yes. On published figures, PR/PSR Series Pancake Slip Ring and Waterproof Slip Ring are the closest match from our supply network. An engineer confirms the fit against your application before recommending anything.
What is the advantage of a frameless slip ring?
A frameless slip ring removes the housing and bearings, so it is lighter, shorter and can fit large bores or tight spaces inside an existing machine. Using the machine's own bearings also avoids alignment conflicts between two bearing sets. The machine builder takes on responsibility for runout, sealing and brush setting, so it suits teams that can control those tolerances.
How accurately must a frameless slip ring be installed?
The ring and brush block must stay concentric and within the runout and axial float the supplier specifies, typically a fraction of a millimetre, so brush pressure stays even around the turn. The rings also need protecting from contamination. Ask for an installation drawing with tolerances and a setting procedure, and allow for inspection access.
Further reading: How to select a slip ring · How to specify a slip ring · Slip rings
Other open and frameless slip rings series
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