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Increase your competitive advantage by converting your DC controls to state-of-the-art OmniPulse DDC Digital DC drives.

The leader in crane and hoist motor control, Electromotive Systems, brings you the OmniPulse DDC Digital DC Drive. OmniPulse will improve the performance and reliability of your DC operated crane or hoist, while minimizing downtime, ma

Ringfeder Shrink Discs


RfN 4071, 4051, 4091 Shrink Discs Sizes from .625" to 34" diameter.

Torques from 77 lb.ft. to 7.6 million lb.ft.

Ideal for transmission of very high torques, particularly when external clamping is advantageous and excellent concentricity is needed. RfN 4071-SR, 4051-SR, 4091-SR Split Shrink Disc Designed as separate-half inner rings which offer greater mounting versatility and allow symmetrical hub designs

Also useable as Half Shrink Discs transmitting half the catalog rated torque - clearance or tapered holes need to be provided in the hub for the locking screws.

RfN 4171 Shrink Discs Sizes for shafts from 0.75 to 16.5" Torques from 136 lb.ft. to 860,000 lb.ft. Uses a single, long, shallow taper instead of opposing tapers of the RfN 4071 Better centering and concentricity Ideal for high-speed applications where balance is critical

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