Ringfeder RfN 4061 Standard Shrink Disc, 14-200 mm

The standard shrink disc for small and mid-size shafts

The RfN 4061 is RINGFEDER’s most popular shrink disc, a universally applicable series for smaller shaft diameters and high torques. It covers inner diameters from 14 to 200 mm and, as the direct further development of the RfN 4071 up to 200 mm, uses forged pressure rings of high stability for good stress distribution and security against breakage. RINGFEDER presents it as the cost-efficient answer for the widest range of applications.

Both two-part and three-part forms are shown in the tech paper. The slit inner ring keeps losses and pressure on the hub low, and the preload can be set to the application by varying the tightening torque. After the screws are loosened the disc releases by itself and the hub moves freely on the shaft.

Technical specifications

Selected sizes from the tech paper

The 14 x 37 size is listed with three shaft diameters (10, 11 and 12 mm). Its screws are of lower quality, 8.8 instead of 10.9, as the table footnote states.

Reading the table from top to bottom shows how the series scales: the 20 x 46 disc is tabulated at 140 Nm with five M5 screws, the 44 x 80 disc at 1,000 Nm with seven M6 screws, and the 200 x 350 disc at 81,000 Nm with twelve M16 screws and an axial force of 1,045 kN. Use the shaft diameter column to match a disc to your shaft, since each size accepts several diameters at different torque values.

Using the series

The nickel plated version is ordered by adding N after the size; the product paper also lists a stainless steel RfN 4061 for equipment that must be cleaned intensely. For shafts above 200 mm the paper points to the extended RfN 4071 series. Typical uses are gear wheels, sprockets, pulleys, couplings, brake discs and levers on machine shafts. Confirm before ordering: the shaft diameter dw within the range of the size, hub yield strength and bore, and torque with shock factor.

For orientation, the product paper lists the maximum clearance S between shaft and bore that the function values allow: 0.011 mm for shafts of 6 to 10 mm, 0.017 mm for 18 to 30 mm, 0.032 mm for 30 to 50 mm and 0.048 mm for 50 to 80 mm. As long as the stated clearance is not exceeded, other tolerances may be chosen without changing the functional characteristics.

Documents and quotation

The PDF is the RINGFEDER tech paper for the RfN 4061 (10.2024). Related drives are listed under Electric Motors and Gear Units. For a quotation send shaft diameter, hub bore, torque and speed.