Inch Formathane Urethane Rods - Low Repulsion Springs

Q: Which urethane type should I choose for high versus low deflection in a mold or fixture spring application?

Use PO-652 Tan for very high load (stiffer response, reduced deflection). Use PO-670 Black for very low load where you need greater compliance at lower forces. For intermediate behavior, select PO-650 Red ( medium load ) or CU-290 Yellow ( high load ). Match the chosen type to the required cushioning stroke and how much rebound you can tolerate.

Q: How do I select the outside diameter (OD) of the urethane rods from the given 1–8 in range?

Choose OD from 1 ~ 8 in based on the available envelope in your tooling or fixture. Verify that the OD provides sufficient contact area for damping while leaving enough space for assembly and compression. If side loading is possible, consider adding guiding features in the housing to maintain consistent spring behavior.

Q: What lengths (L) are available, and how should I match length to the load path in the mold tooling?

Available lengths are 3, 6, 12, 24, 36, and 48 in . Select the length that spans the full region where compression occurs so the rod supports the load path throughout cycling. Avoid a length that is too short, as it can concentrate stress and reduce repeatability of cushioning.

Q: What is the role of low repulsion urethane in preventing undesirable rebound in automated operations?

Low repulsion urethanes are intended to maintain stable cushioning and damping behavior while reducing “recoil” after impact. This helps protect sensitive systems by absorbing shocks without compromising motion control. The specific tuning by urethane type (e.g., PO-670 vs PO-652) lets you tailor the rebound tendency to your cycle conditions.

Inch Formathane Urethane Rods - Low Repulsion Springs (DANLY IEM) deliver dependable cushioning for shock and vibration control in demanding industrial equipment, using urethane formulations tuned for stable support and reduced wear.

Built on pillar-shaped spring geometry to stabilize operation under dynamic loads
Low repulsion urethanes (e.g., Shore A70) help maintain consistent damping performance
Designed to protect sensitive systems by absorbing impacts without compromising motion control
Available in multiple urethane types to match varying load and deflection requirements

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Specifications

524 configurations available

Urethane Type	Length (L) (in)	Outside Dia. (in)
PO-652 Tan (Very high load)	3	1/4
PO-670 Black (Very low load)	3	1/4
PO-650 Red (Medium load)	3	1/4
CU-290 Yellow (High load)	3	1/4
PO-652 Tan (Very high load)	6	1/4
PO-670 Black (Very low load)	6	1/4
PO-650 Red (Medium load)	6	1/4
CU-290 Yellow (High load)	6	1/4
PO-652 Tan (Very high load)	12	1/4
PO-670 Black (Very low load)	12	1/4
PO-650 Red (Medium load)	12	1/4
CU-290 Yellow (High load)	12	1/4
PO-652 Tan (Very high load)	24	1/4
PO-670 Black (Very low load)	24	1/4
PO-650 Red (Medium load)	24	1/4
CU-290 Yellow (High load)	24	1/4
PO-652 Tan (Very high load)	3	3/8
PO-670 Black (Very low load)	3	3/8
PO-650 Red (Medium load)	3	3/8
CU-290 Yellow (High load)	3	3/8
PO-652 Tan (Very high load)	6	3/8
PO-670 Black (Very low load)	6	3/8
PO-650 Red (Medium load)	6	3/8
CU-290 Yellow (High load)	6	3/8
PO-652 Tan (Very high load)	12	3/8
PO-670 Black (Very low load)	12	3/8
PO-650 Red (Medium load)	12	3/8
CU-290 Yellow (High load)	12	3/8
PO-652 Tan (Very high load)	3	1/2
PO-670 Black (Very low load)	3	1/2
PO-650 Red (Medium load)	3	1/2
CU-290 Yellow (High load)	3	1/2
PO-652 Tan (Very high load)	6	1/2
PO-670 Black (Very low load)	6	1/2
PO-650 Red (Medium load)	6	1/2
CU-290 Yellow (High load)	6	1/2
PO-652 Tan (Very high load)	12	1/2
PO-670 Black (Very low load)	12	1/2
PO-650 Red (Medium load)	12	1/2
CU-290 Yellow (High load)	12	1/2
PO-652 Tan (Very high load)	24	1/2
PO-670 Black (Very low load)	24	1/2
PO-650 Red (Medium load)	24	1/2
CU-290 Yellow (High load)	24	1/2
PO-652 Tan (Very high load)	36	1/2
PO-670 Black (Very low load)	36	1/2
PO-650 Red (Medium load)	36	1/2
CU-290 Yellow (High load)	36	1/2
PO-652 Tan (Very high load)	48	1/2
PO-670 Black (Very low load)	48	1/2

Product Guide

🏭Application Scenarios+

These low repulsion urethane rods are used inside injection mold tooling and industrial fixture systems where vibration damping and impact cushioning are required without introducing stick-slip behavior. Because the urethane is engineered for stable support, the rod helps maintain consistent compliance during repeated load cycles.

Automotive and appliance component fixtures: Suitable for locating and cushioning pins, slides, or work-holding components that experience intermittent knocks or cyclical vibration. Low repulsion urethanes help keep damping performance predictable as contact conditions change.
Medical device housings and precision parts: Ideal for protecting sensitive mechanisms in assembly jigs where shock events could shift alignment. Pillar-shaped spring geometry supports dynamic loads while reducing the risk of sudden rebound.
Electronics and industrial sensor modules: Works well for cushioning against handling impacts and vibration in post-molding operations, helping preserve finished-part dimensional stability.

Select the urethane type (e.g., PO-652 Tan very high load or PO-670 Black very low load) to match the required deflection and return behavior.

🔧Material & Process Details+

Formathane urethane rods use purpose-tuned urethane formulations selected by load level and damping behavior. The product family includes PO-652 Tan (very high load), PO-650 Red (medium load), PO-670 Black (very low load), and CU-290 Yellow (high load). These low repulsion materials are designed to reduce contact “recoil” and maintain stable spring response under dynamic loading.

Material properties: Urethane provides high damping for vibration control and cushioning for shock absorption, with wear resistance tailored by formulation.
Hardness: The description notes low repulsion urethanes such as Shore A70, supporting consistent compliance.

Heat treatment/manufacturing: As a urethane component, it is not described as heat-treated like steel; it is manufactured as an engineered polymer rod with the specified pillar-shaped spring geometry.

Compared across variants, higher-load types (PO-652/CU-290) generally trade increased stiffness for less deflection, while PO-670 is optimized where compliance needs to be greatest at lower loads.

📐Sizing & Selection Guide+

To select the correct urethane rod dimensions for mold tooling or fixtures, match both the outside diameter and the length (L) to the available space and the required support travel under load.

Outside Dia. range: choose from 1 ~ 8 in based on the cavity/core envelope and the guide clearance around the rod.
Length (L) options: select from 3, 6, 12, 24, 36, or 48 in to ensure full engagement across the load path.

For core/cavity mounting, determine the effective bearing area and ensure the rod length covers the full region that will see compression during cycling. Because urethane compliance influences deflection, allow for the intended stroke so the rod does not bottom out.

Tolerance/fit: The provided data specifies size ranges but not explicit tolerance values; use practical clearance designed for urethane compression and ensure the surrounding housing prevents side loading that could affect repeatability.
Configurable vs fixed: Urethane type (PO-652, PO-670, PO-650, CU-290) and available lengths are defined as selectable options; outside diameter is chosen from the stated 1–8 in range.

Frequently Asked Questions

Which urethane type should I choose for high versus low deflection in a mold or fixture spring application?+

Use PO-652 Tan for very high load (stiffer response, reduced deflection). Use PO-670 Black for very low load where you need greater compliance at lower forces. For intermediate behavior, select PO-650 Red (medium load) or CU-290 Yellow (high load). Match the chosen type to the required cushioning stroke and how much rebound you can tolerate.

How do I select the outside diameter (OD) of the urethane rods from the given 1–8 in range?+

Choose OD from 1 ~ 8 in based on the available envelope in your tooling or fixture. Verify that the OD provides sufficient contact area for damping while leaving enough space for assembly and compression. If side loading is possible, consider adding guiding features in the housing to maintain consistent spring behavior.

What lengths (L) are available, and how should I match length to the load path in the mold tooling?+

Available lengths are 3, 6, 12, 24, 36, and 48 in. Select the length that spans the full region where compression occurs so the rod supports the load path throughout cycling. Avoid a length that is too short, as it can concentrate stress and reduce repeatability of cushioning.

Are these urethane rods steel-like in hardness and heat treatment, and do they require quench-and-temper?+

No. The product is urethane (Formathane) and the provided information does not specify steel heat treatment, quenching, or tempering. Hardness references such as Shore A70 relate to polymer formulation performance rather than metal HRC values. Heat treatment requirements should follow the supplier’s polymer manufacturing process, not steel procedures.

What is the role of low repulsion urethane in preventing undesirable rebound in automated operations?+

Low repulsion urethanes are intended to maintain stable cushioning and damping behavior while reducing “recoil” after impact. This helps protect sensitive systems by absorbing shocks without compromising motion control. The specific tuning by urethane type (e.g., PO-670 vs PO-652) lets you tailor the rebound tendency to your cycle conditions.