Standard K-Prene Tubes / Springs – 3/4″ ID, 24″ Length – KPS0304

Stocked in 95A Durometer, urethane tubes and urethane springs are useful in applications where vibration, corrosion and magnetism prevent the use of steel springs. Also, urethane springs have proven to be safest, most efficient and reliable compression material for punching, stamping and drawing dies.

The K•Prene® urethane Tube/Spring material is a polyether-elastomer that reacts similarly to an incompressible fluid. The volume of material moved by compression is displaced laterally in the form of bulging sides. An approximate change in the diameter of our K•Prene® urethane tube stock can be made by increasing the diameter by the same amount of compression.

Example: A 1.50″ long spring is to be deflected by 15% or .225″. The diameter will then also increase roughly by .225″. The material’s lateral expansion must be considered for many applications.

The maximum recommended free (unloaded) length is 2.5 times the springs outside diameter, although springs may be stacked with guide rods and washer-shaped spacers.

Suggested maximum cyclic frequencies and deflection percentages of free length are summarized by the following for 95A Durometer Tubes/Springs.