True-Tech Industries Co. - Power Transmission

SHRINK DISCS RfN 4071, 4051, 4091
The shrink discs are external locking devices installed over hub projections. By tightening the locking screws, the locking collars exert radial forces on the tapered ring and on the hub. After bridging the fit clearances, radial clamping pressure is generated between shaft and hub establishing a solid, frictional connection. For adjustment or removal, just unscrew the bolts.

Applied for transmission of very high torques, particularly when external clamping is advantageous and excellent concentricity is required.

Available sizes:
The Shrink Discs accommodate both inch and metric shafts ranging from 0.75" to 34" dia.

SPLIT SHRINK DISCS RfN 4071-SR, 4051-SR, 4091-SR
They are basically the standard Shrink Disc with two separate half inner rings offering greater mounting versatility and allowing symmetrical hub designs. Split Shrink Discs can also be used as Half Shrink Discs transmitting half the catalog rated torque. Then, either clearance or tapered holes need to be provided in the hub for the locking screws.

Applied for transmission of very high torques, particularly when external clamping is advantageous and excellent concentricity is required.

Available sizes:
The Shrink Discs accommodate both inch and metric shafts ranging from 0.75" to 34" dia.

SHRINK DISCS RfN 4171
This new RfN 4171 Shrink Disc employs a single, long, shallow taper instead of opposing tapers in the traditional Ringfeder® three-piece series (RfN 4071). Better centering and concentricity result, making the shrink disc especially suitable for high-speed applications where balance is critical.

Installation is also simplified. When the fasteners are properly torqued, the installer has a visual aid to indicate correct installation, i.e.: the inner ring should be flush with the outer ring face.

Available sizes:
Shafts from 3/4" to 16.5", and torques from 136 lb-ft to 860,000 lb-ft.