Heavy Duty Formathane Urethane Springs & Tube Stock (Inch)

These heavy-duty urethane springs and tube stock are used in injection mold tooling wherever vibration damping, stable pillar action, and repeatable shock absorption are required. A common scenario is automotive connector and sensor insert molding, where molded parts experience intermittent load spikes during ejection or alignment; selecting a very-high- to very-low-load urethane type helps tune system compliance to the press cycle.

They are also suited for precision medical device housings and other tight-tolerance assemblies that must resist unwanted motion. The low repulsion urethane options help reduce micro-movement while maintaining stable installation through the hole/counterbore mounting design.

In addition, use in industrial automation gripper and transfer tooling benefits from consistent damping under continuous use. The availability of multiple urethane load ranges (PO-670 to PO-652, plus CU-290 and PO-650) makes this variant compatible with varying load and cycle demands across mold designs.

The Formathane urethane compounds are designed for vibration damping and load-bearing behavior across multiple performance tiers. Available urethane types include PO-652 Tan (very high load), PO-650 Red (medium load), CU-290 Yellow (high load), and PO-670 Black (very low load). The “low repulsion” option is intended to reduce rebound/undesired return motion, which supports stable operation in precision tooling.

• Wear resistance vs. toughness trade-off: Higher-load formulations typically prioritize stiffness and load capacity, while lower-load options favor greater compliance. This tuning affects how the spring manages shock energy and rebound behavior over repeated cycles.
• Heat treatment: As urethane stock, performance is primarily governed by polymer formulation rather than steel heat treatment steps (no quench-and-temper or nitriding is specified in the provided data).

Choose the urethane type based on the required load range and acceptable rebound characteristics for the molding and ejection sequence.

Select dimensions by matching the spring/tube geometry to the mold’s required travel, support spacing, and mounting hole features. This inch series supports length (L) from 1 to 24 in, outside diameter from 1 to 2.75 in, and inner diameter (d) from 0.25 to 1.5 in.

• Outside diameter (OD): Confirm OD clearance within the surrounding mold plate, guide housing, or cavity support structure while maintaining enough contact area for stable pillar performance.
• Inner diameter (d): Match d to the installed shaft/guide and ensure functional clearance. If you have a shaft or pin, select the d value that provides the needed fit for alignment without binding during deflection.
• Length (L): Ensure L fits the available stack height in the tooling while allowing the expected compression under your selected load range.

The urethane type (PO-652, PO-650, CU-290, PO-670) is a configurable performance parameter, while OD/d/L are chosen from the provided ranges.