Large-diameter slip rings
MOFLON GBT Series large through-bore slip rings
Large through-bore slip rings built to order with bores up to 2,000 mm, for machines where a large central passage must stay clear.
Key specifications
| Bore (max) | 2,000 mm |
|---|
Summarised in our own words from MOFLON Technology (legal entity name not stated on its website)'s published data; series maxima, individual models vary. Last checked 2026-10-30. Source 1 · Source 2
Notes on this data
Only the bore figure is published on the category page; the About page gives a 2 m maximum custom diameter.
Specify Motion is not affiliated with MOFLON Technology (legal entity name not stated on its website). MOFLON and GBT Series large through-bore slip rings are used only to identify the product. Comparisons use published figures; always confirm against the current datasheet.
Typical applications
Engineer support
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Our experienced engineers are on hand, ready to help with your project. Whether you need the MOFLON GBT Series large 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 GBT Series large 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
What a large-diameter slip ring is
A large-diameter slip ring is a rotary joint with a bore or ring diameter typically of several hundred millimetres up to a few metres, built for very large rotating structures. The rings are often fabricated in segments or machined as drums or platters, with brush blocks mounted around the stationary frame. Because the structure is large, they are usually designed to match the customer's machine and may integrate power, signal, data, fibre or contactless channels and media passages in one assembly.
When engineers choose a large-diameter slip ring
Choose a large-diameter design when the rotating structure has a big central opening, such as CT gantries, large turntables, radar pedestals, cranes and slewing platforms, or when cabling and services must pass through a wide bore. The trade-offs are cost, lead time and high surface speed even at modest rpm, which limits speed and raises brush wear. Mechanical runout of the machine becomes significant at this scale, so the slip ring is usually designed alongside the structure rather than chosen from a catalogue.
How to specify the MOFLON GBT Series large through-bore slip rings
Send these with your enquiry and an engineer can confirm the right GBT Series large through-bore slip rings variant or an equivalent:
- Bore and outer diameter limits (mm)
- Speed and surface speed (rpm, m/s)
- Power circuits, current and voltage (A, V)
- Data rates and channels, including contactless or fibre
- Structure runout and flatness at the mounting faces (mm)
- Environment: outdoor exposure, IP code and temperature (°C)
- Segmentation for installation and maintenance access
Common mistakes to avoid
- Specifying late, when the structure leaves too little room or too much runout for the slip ring
- Using the catalogue rpm without checking surface speed at the actual diameter
- Not planning how the ring will be lifted, installed and serviced in place
- Leaving out data rate growth, so the channel count is outgrown within the machine's life
MOFLON GBT Series large through-bore slip rings: frequently asked questions
What is the MOFLON GBT Series large through-bore slip rings?
Large through-bore slip rings built to order with bores up to 2,000 mm, for machines where a large central passage must stay clear. Published series figures include bore 2,000 mm. It is made by MOFLON Technology (legal entity name not stated on its website); Specify Motion can help source it or propose an equivalent.
Who makes the MOFLON GBT Series large through-bore slip rings?
The MOFLON GBT Series large through-bore slip rings is made by MOFLON (MOFLON Technology (legal entity name not stated on its website)) and is listed here for engineers comparing options. Specify Motion is not affiliated with MOFLON Technology (legal entity name not stated on its website); brand names are used only to identify the product.
What is the bore of the MOFLON GBT Series large through-bore slip rings?
The published series maximum bore is 2,000 mm. Individual models and sizes in the GBT Series large 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 MOFLON GBT Series large through-bore slip rings?
Yes. Our engineers can propose an equivalent built around your load, speed and environment. An engineer confirms the fit against your application before recommending anything.
Why do large slip rings have lower speed ratings?
Surface speed is diameter multiplied by rotational speed, so a ring a metre across turning at 60 rpm already runs faster at the contact than a small capsule at a thousand rpm. Brush wear, heat and contact bounce all rise with surface speed. Large-diameter designs manage this with brush materials, contact force and runout control, but their rpm ratings are typically far lower.
How is high-speed data passed through a large-diameter slip ring?
Contact rings work for slower networks, but for very high data rates, such as CT image data, large rings often use contactless capacitive, inductive or optical transmission around the circumference. A fibre optic rotary joint can also be placed on the axis if the centre is accessible. State the data rate and latency requirements early, as they shape the whole design.
Further reading: How to select a slip ring · How to select a fibre optic rotary joint · Slip rings
Other large-diameter slip rings series
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Our engineers are ready to help with your project
Tell us about your project and how you use the MOFLON GBT Series large 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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