Through-bore slip rings
Fabricast Self-contained through-bore slip rings
Housed through-bore slip rings with 0.50 to 2.00 in bores; the 1.00 in range offers 2 to 24 coin-silver rings at 5 A (10 A option), 60 V standard up to 1,000 V, up to 10,000 rpm and 1 Gb Ethernet capability.
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Need Fabricast parts, a replacement or another suitable option? Send your part number or describe the application. We’ll review the requirement and help with product selection, sourcing, pricing and lead times.
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Key specifications
| Circuits (max) | 24 |
|---|---|
| Current per circuit (max) | 10 A |
| Voltage (max) | 1,000 V |
| Speed (max) | 10,000 rpm |
| Bore | 12.7–50.8 mm |
| Data / bus | 1 Gb Ethernet capable |
| Contacts | coin silver rings, silver-graphite brushes |
| Options | hard-vacuum compatible |
Summarised in our own words from United Equipment Accessories, Inc.'s published data; series maxima, individual models vary. Last checked 2026-10-30. Source 1 · Source 2
Notes on this data
Ring count, current, voltage and speed are for the 1.00 in bore range; 10,000 rpm with FAG150 brushes subject to review.
Specify Motion is not affiliated with United Equipment Accessories, Inc.. Fabricast and Self-contained through-bore slip rings are used only to identify the product. Comparisons use published figures; always confirm against the current datasheet.
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Our experienced engineers are on hand, ready to help with your project. Whether you need the Fabricast Self-contained through-bore slip rings 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 Self-contained through-bore slip rings 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 Fabricast Self-contained through-bore slip rings
Send these with your enquiry and an engineer can confirm the right Self-contained through-bore slip rings 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
Fabricast Self-contained through-bore slip rings: frequently asked questions
Can you help replace Fabricast Self-contained through-bore slip rings 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 Motion Control Products options where appropriate. We confirm compatibility and any changes needed before recommending a replacement.
What is the Fabricast Self-contained through-bore slip rings?
Housed through-bore slip rings with 0.50 to 2.00 in bores; the 1.00 in range offers 2 to 24 coin-silver rings at 5 A (10 A option), 60 V standard up to 1,000 V, up to 10,000 rpm and 1 Gb Ethernet capability. Published series figures include circuits 24, current per circuit 10 A, voltage 1,000 V, speed 10,000 rpm. It is made by United Equipment Accessories, Inc.; Specify Motion can help source it or propose an equivalent.
Who makes the Fabricast Self-contained through-bore slip rings?
The Fabricast Self-contained through-bore slip rings is made by Fabricast (United Equipment Accessories, Inc.) and is listed here for engineers comparing options. Specify Motion is not affiliated with United Equipment Accessories, Inc.; brand names are used only to identify the product.
What is the circuits of the Fabricast Self-contained through-bore slip rings?
The published series maximum circuits is 24. Individual models and sizes in the Self-contained through-bore slip rings 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 Fabricast Self-contained through-bore slip rings?
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
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Tell us about your project and how you use the Fabricast Self-contained through-bore slip rings: the load, speed, duty and environment. An experienced engineer will review it and reply, normally within one working day.
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