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igus® Ltd.

Caswell Road

Northampton, NN4 7PW

01604 677240

drylin® - trapezoidal leadscrew nuts - Assembly instruction

drylin® lead screw nuts must be secured against twisting and axial sway.

Leadscrew nuts with flange

The maximum tightening torque for the flanged lead screw nut fastening screws is 2.5Nm. We recommend that fastening screws be secured with a third medium (such as liquid thread-locking glue). Metallic ferrules should be used for even higher tightening torques.

Cylindrical lead screw nuts

The cylindrical lead screw nut outer diameter tolerances are according to h9. We therefore recommend the use of spanner flat. In practice, a screw mount has proven to be effective with low forces. Gluing lead screws nuts is not recommended. If however, the securing of the lead screw nuts by adhesives is planned, individual tests are necessary in each case.

Zero-backlash lead screw nut assembly

1. Support nut
2. Locking ring with torsion spring
3. Friction disc
4. Axial element
Using the torsion spring (2.), thread the locking ring approx. half-way onto the support nut (1.) and secure the spring tab in the bore.

Thread the locking ring to the end of the support nut to tension the torsion spring.

Position the friction disc (3.) and the axial element (4.) flush against the locking ring. Ensure that the locking ring does not rotate.

Press together the support nut (1.) and the axial element (4.) and thread the lead screw through the nut. Pre-tension the locking ring while doing so.

You can now let go of the locking ring, therefore pre-tensioning the nut on the lead screw.

Assembly instruction videos

Zero-backlash lead screw nut assembly (disassembled) (german)
Zero-backlash lead screw nut assembly (as shipped) (german)
Anti-backlash lead screw nut assembly (german)