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A metal flex disc coupling with two shim packs per side, replacing elastomer with spring steel discs. Built for pump drives and industrial power transmission where backlash must be zero, temperature must be tolerated and angular / axial misalignment must be absorbed without sacrificing torsional rigidity.
Replaces elastomer with spring steel — keeps flexibility, adds temperature capability
A metal flex disc coupling is a disc type coupling where several flexible metallic elements are bolted alternately to opposite flanges. Because the elastomer used in a jaw coupling or spider coupling is replaced by spring steel discs, the metal flex disc coupling keeps angular and axial misalignment capability but adds high temperature capability that no elastomer can match. The stretched shim pack design gives zero backlash — there is no rubber to compress, no spider to wear, and no hysteresis loss in the drive train.
EPT Metal Flex couplings are available up to 13,367 Nm torque with a single shim pack (UMK series) or a double shim pack (UMS series). The double pack version — the product on this page — uses two disc packs per side to raise torque capacity and increase axial and angular misalignment allowance without enlarging the coupling envelope.
Each point maps to a specific pump or drive-line problem
Both series cover the same torque range but solve different alignment problems
One disc pack per flange. Lowest axial and bending stiffness, highest misalignment tolerance per unit of torque. Best for close-coupled pump drives where the shafts are already aligned and the metal flex disc coupling mainly absorbs residual misalignment and thermal growth.
Two disc packs per flange. Higher torque capacity in the same envelope, and greater angular and axial misalignment allowance. Best for spacer-type pump drives and longer drive trains where shaft alignment cannot be guaranteed to the same tolerance as a close-coupled arrangement.
If you are not sure which version fits, send us the pump shaft drawing, the motor shaft drawing and the spacer length. We will confirm the correct series, disc pack count and bolt pattern before you order.
Standard coupling data plus the machining envelope for custom builds
| Coupling Type | Metal flex disc coupling — double shim pack (UMS series) or single shim pack (UMK series) |
|---|---|
| Max Torque | Up to 13,367 Nm (single pack UMK) — double pack raises capacity in the same envelope |
| Backlash | Zero — stretched shim pack under tension at zero torque |
| Misalignment Capability | Angular and axial, with low axial and bending stiffness |
| Temperature Capability | High temperature — no elastomer element, disc pack is spring steel |
| Inspection | Visual disc and bolt inspection without dismantling the drive |
| Speed Capability | High-speed balanced disc pack, no centrifugal restriction from elastomer mass |
Materials Available
Machining & Surface Finish
| CNC Turning | φ0.5 – φ300 × 750 mm, tolerance ±0.005 mm |
|---|---|
| CNC Milling | 510 × 1020 × 500 mm max, tolerance ±0.001 mm to ±0.005 mm |
| Aluminum Finish | Clear anodized, color anodized, sandblast anodized, chemical film, brushing, polishing, chroming |
| Stainless Finish | Polishing, passivating, sandblasting, laser engraving |
| Steel Finish | Zinc plating, oxide black, nickel plating, chrome plating, carburized, heat treatment, powder coated |
| Plastic Finish | Painting, chrome plating, polishing, sandblast, laser engraving |
| Drawing Formats Accepted | IGS, STP, X_T, DXF, DWG, Pro/E, PDF |
| Test Equipment | Measurement instrument, projector, CMM, altimeter, micrometer, thread gages, calipers, pin gauge |
Pump drives and industrial power transmission where backlash and temperature matter
The metal flex disc coupling connects motor to pump without transmitting vibration or bending load to the pump bearings. Zero backlash keeps flow control accurate where the pump is servo-driven.
Boiler feed, hot oil circulation, exhaust-driven pumps. The metal flex disc coupling disc pack tolerates temperatures that would destroy a jaw coupling spider in weeks.
Zero backlash from the stretched shim pack means the driven shaft follows the motor command without a dead band. Used on test stands and positioning drives.
When the pump must be pulled back for seal change without moving the motor, a double pack disc coupling with a spacer drop-out section allows the pump to slide out without disturbing alignment.
Balanced disc packs run at speeds where elastomer couplings would be limited by centrifugal mass. Suitable for gearbox input and output couplings on high-speed trains.
Where a jaw coupling or spider coupling keeps failing from heat or from misalignment, the metal flex disc coupling is a direct upgrade. Bolt pattern and bore can be matched to the existing hubs.
From drawing to delivery — four steps
Pump shaft and motor shaft drawings, spacer length, torque, speed. IGS, STP, DXF or PDF accepted.
We confirm UMK single pack or UMS double pack, bore tolerance, bolt pattern and materials.
Written quotation with unit price, MOQ, lead time, shipping terms and packing method.
Machined, assembled, inspected and packed for export. Run-off data supplied on request.
Buyers sourcing disc couplings often combine the order with these items
Answers to what buyers ask before placing the first order
Send us the pump and motor shaft drawings, spacer length and operating torque. We will reply with coupling size, materials, price, lead time and packing details.
Address
Luotuo Industrial Area, Zhenhai District, Ningbo City, China
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