Formathane Medium Duty Urethane Springs & Tube Stock - Inch

These Formathane medium-duty urethane springs and tube stock are used in injection mold tooling and end-of-arm tooling where controlled vibration damping, shock absorption, and stable support are required. Their pillar-shaped geometry helps maintain predictable resilience under intermittent loading, reducing the risk of nuisance motion in precision assemblies.

• Automotive part handling systems: Install around guide elements or load-transfer points to dampen impacts from rapid indexing, helping protect fixtures and increase cycle-to-cycle repeatability.
• Industrial vibration damping in mold support: Use for isolating shock energy in machine mount interfaces or tooling brackets subject to brief overload events, especially where metallic springs can transmit noise and rebound.
• General industrial assemblies: Fit in protective or cushioning applications where low repulsion and heavy-duty resilience are needed; the PO-652/CU-290 grades target very high to high load conditions.

The selected urethane type (PO-650/PO-652/CU-290/PO-670) lets engineers tune stiffness and damping to the specific load and rebound requirements of the molding cell.

This product is made from Formathane polyurethane in multiple load-rated formulations, supplied as urethane tube stock and pillar-shaped spring components. Urethane grade selection is the primary “material property” lever for tuning stiffness and damping behavior.

• Urethane Types: PO-652 Tan (very high load), PO-650 Red (medium load), CU-290 Yellow (high load), PO-670 Black (very low load). Higher load grades typically provide higher resistance to compression but may trade off some compliance compared with lower-load options.
• Heat treatment: The data provided specifies urethane formulations rather than hardened tool steels, so heat treatment in the metallurgical sense (e.g., quench & temper, nitriding) is not applicable to selecting this variant.
• Manufacturing process: Formathane components are manufactured as urethane shapes designed for resilience under dynamic loading, emphasizing wear resistance and consistent rebound characteristics rather than metal hardness.

Unlike steel spring inserts, these urethane parts are chosen for damping and shock absorption performance over HRC-based wear life.

Select dimensions by matching the required compression-support envelope in your mold tooling or equipment assembly. Start with the length (L) from 1 to 24 in to fit the available stack-up height between opposing surfaces or tooling interfaces.

• Outside diameter (OD): Choose OD 0.8125 to 2 in so the spring clears nearby features while providing adequate contact area for load transfer.
• Inner diameter (d): Select d 0.1875 to 1 in for alignment around shafts, posts, or guide elements without interference.
• Load tuning: Pair the dimensions with the correct urethane type—PO-652 (very high load) through PO-670 (very low load)—to achieve the desired stiffness/damping response.

Because tolerance values are not provided in the available data, use a standard engineering clearance approach for urethane in moving assemblies: verify fit against your shaft/post geometry and allow for dynamic deflection under shock loads.