Locking Assembly RfN 7012 stainless steel

Narrow locking assembly made of stainless steel
The RfN 7012 stainless steel locking assembly transmits high forces and torques. Ideal for confined spaces, compensates for tolerance deviations, and self-releasing during disassembly. Contains no moving parts on the shaft and hub, reusable. Not self-centering. Applications include: chain wheels, levers, belt pulleys, shaft-mounted gear units, conveyor drums, impellers, and rope pulleys.

Product Features

• Narrowest design, particularly suitable for applications with limited space
• The RfN 7012 stainless steel compensates for small tolerance variations and minor assembly errors
• High transmittable forces and torques – multiple RfN 7012 stainless steel units can be arranged in series; torque and axial force values are additive
• Simple assembly – no heat treatment or fitting required compared to interference fits. RfN 7012 units can bridge large fitting clearances
• Low sensitivity to contamination – during tightening, functional surfaces press firmly together, preventing ingress of dirt and moisture
• Wear-free operation – the RfN 7012 stainless steel assembly contains no moving parts on the shaft or hub, reliably eliminating wear and backlash. Can be repeatedly engaged and disengaged

Applications

• Chain wheels
• Levers
• Belt pulleys
• Shaft-mounted gear units
• Conveyor drums
• Impellers
• Rope pulleys

Locking Assembly Installation

Locking assemblies are delivered lightly oiled and ready for installation. The values for T, Fax, pW, and pN apply in the delivered condition.

Recommended installation tolerances:

• Shaft: k9–h9
• Hub: N9–H9
• Maximum permissible:
  • Shaft: k11–h11
  • Hub: N11–H11

To avoid excessive deformation of the relatively thick pressure rings, the assembly should be positioned symmetrically between shaft and hub bore. If the shaft is smaller than nominal d, the bore should be larger than nominal D by the same amount, and vice versa. Runout quality is defined by the direct centering between shaft and hub.

Arrangement of multiple RfN 7012 stainless steel units

If multiple assemblies are used, the transmission values from the table can be added if the units are spaced within a distance of 4·L.

Adjustment of screw tightening torques

The assemblies are equipped with A2-70 grade screws. Reduced torque is possible by tightening the screws with less force.

Extraction Threads

To ease disassembly, auxiliary threads are provided in the front pressure rings.