How much do spacers raise clearance and will they harm handling?

The lift depends on spacer height, which is selected for the specific vehicle and task. A moderate lift compensates for settled springs and adds ground clearance without noticeable loss of handling. Excessive height changes suspension geometry, so height and hardness are best agreed with factory engineers for your model.

Will the suspension become too stiff with polyurethane spacers?

A spacer under a spring adds some stiffness, and this is a controllable characteristic through hardness selection in the range from 50 Shore A to 70 Shore D. Softer polyurethane is closer to the standard travel; harder polyurethane better supports a loaded or commercial vehicle. The optimal balance is selected for your task.

Why is a polyurethane spacer better than a rubber or capron one?

Polyurethane combines tensile strength of 39-87 MPa with rebound elasticity of 34-61 %, while rubber is weaker and settles faster, and capron is nearly inelastic (rebound 5-15 %) and chips under impact. Polyurethane carries the load, recovers its shape, and does not crack on rough roads.

Can spacers be produced for a specific vehicle model?

Yes. From a sample or drawing the factory casts spacers to your seating dimensions: under spring, under strut, or inter-coil. This is the standard way to obtain a part for rare or older equipment and to select a non-standard lift height.

Do spacers withstand operation in winter and at sub-zero temperatures?

Yes. The operating range of TIMOL polyurethane is from -60 to +100 °C, so spacers do not stiffen or crack in frost, unlike many rubbers that harden in cold. This is important for suspension operation in winter conditions without loss of resilience.

Polyurethane Spacers: Clearance and Suspension Life Without Sagging

A settled spring announces itself immediately: the vehicle drops at the rear, its under-body guard catches road irregularities, it rolls more in corners, and a full spring replacement is still a long and expensive way off. Rubber spacers under the spring quickly compress and stiffen in frost, while rigid capron chips at the first serious bump. Polyurethane spacers from TIMOL factory carry the load, recover their shape, and deliver ground clearance without sagging for seasons on end. This article explains how these spacers work, why polyurethane outperforms rubber and capron, and how to order a part for your vehicle.

What Polyurethane Spacers Are and What They Are For

A polyurethane spacer is a resilient insert placed in the suspension to lift the body, compensate for spring sag, and add ground clearance. In appearance it is a solid cylinder or ring with strong walls, working under compression between suspension elements.

The primary task of a spacer under a spring is to raise the body above the shock-absorber struts and restore the height lost by settled springs. As a side effect, it softens the oscillations transmitted to the body and unloads adjacent suspension components. Inter-coil spacers serve a different purpose: they are placed between spring coils to increase spring rate and prevent the coils from bottoming out at full jounce.

By installation method, spacers fall into several types. Those mounted under the spring act as a spacer between the spring and the body and raise the vehicle slightly. Inter-coil spacers increase stiffness without a noticeable rise in clearance. Adjustable spacers allow clearance and stiffness to be varied to requirement. The range of automotive polyurethane parts is listed in the product catalogue.

Why Polyurethane Is Better Than Rubber and Capron in Spacers

Polyurethane wins because it combines the ability to carry compressive load with resilience and impact resistance — exactly what its competitors lack in this node. Tensile strength for polyurethane is 39-87 MPa versus 8-20 MPa for SBR rubber and 20-30 MPa for natural rubber. This means a polyurethane spacer carries vehicle weight without compressing through or tearing better than any rubber.

A rubber spacer initially works acceptably but quickly settles under sustained load and stiffens in frost, losing resilience. The operating range of polyurethane from -60 to +100 °C eliminates the frost problem: the part retains its properties in winter too. Abrasion per DIN 53516 for polyurethane is 38-39 mm³ versus 100-200 mm³ for SBR, so where the spacer rubs against metal polyurethane lasts significantly longer.

Capron (polyamide PA6/PA66) is sometimes used as a rigid spacer because it carries static load well. But its rebound elasticity is only 5-15 % versus 34-61 % for polyurethane. In practice this means capron does not absorb impact but takes it rigidly and chips under sharp loads; it also absorbs moisture. Polyurethane at hardness up to 70 Shore D delivers comparable stiffness while remaining resilient and crack-free.

Material	Abrasion DIN 53516, mm³	Operating t, °C	Hardness	Tensile strength, MPa	Rebound elasticity, %
Polyurethane TIMOL	38-39	-60…+100	85A-95A	39-87	34-61
SBR rubber	100-200	-40…+80	40A - 80A	8-20	30-55
Natural rubber NR	60-130	-50…+70	30A - 80A	20-30	40-75
Capron PA6/PA66	30-90	-40…+100	75D - 85D	60-85	5-15

The table explains the basis of the choice: rubber is soft but weak and settles quickly; capron is hard but inelastic and brittle under impact; polyurethane covers the full required hardness range while retaining resilience and wear resistance.

Engineer’s tip: select spacer height conservatively. Every extra centimetre of lift changes the angles of the control arms and ball joints, so excessive lift accelerates wear of the running gear and impairs handling. To compensate for settled springs a small height is sufficient. Match hardness to the load: for a passenger car use the lower half of the Shore A range; for a loaded or commercial vehicle a harder material closer to Shore D. Ensure the spacer bearing surface makes full contact with the spring cup — partial bearing destroys the part at the edge.

Selecting Spacers and What to Consider at Installation

Spacer selection starts with the objective: to compensate for sag, raise clearance for off-road conditions, or increase spring stiffness. Each objective calls for a different type: under-spring for lift, inter-coil for stiffness, adjustable for flexible tuning. Height and hardness of the part depend on the objective.

At installation it is important to account for the fact that a spacer changes suspension geometry. A moderate lift is safe, but significant lift requires checking the length of brake hoses, driveshafts, and wheel alignment angles. Bearing surfaces under the spacer must be cleaned of dirt and rust, and the part itself installed so that load is distributed evenly over the full area without tilt.

Polyurethane provides an additional benefit in this node beyond the numbers: it does not corrode and does not seize to metal, so the next suspension service is easier than with metal or rubber elements that have rusted in place. The casting and substrate preparation process is described in the reference information section.

Other Applications of Polyurethane Spacers

Beyond automotive suspension, polyurethane spacers function as separating and compensating elements in industrial nodes. The factory’s overall product range covers 12 industries, and spacers are in demand wherever a gap must be maintained, a joint must be unloaded, or vibration between parts must be damped.

In mechanical engineering, spacers set clearances and compensate for thermal expansion between assemblies. In agricultural and commercial equipment they work in suspension and attached implements under high loads and in frost. In pump and conveyor equipment spacers damp vibration between the frame and the machine. In all these cases the decisive property is the combination of load-carrying capacity and resilience that only polyurethane delivers.

This breadth of application is explained by the free-casting process: the factory reproduces a spacer of any size and hardness to fit the specific seat. As a result a single part can simultaneously meet several requirements: carry a specified load, damp vibration, and withstand moisture and chemicals. Further detail on material selection for different tasks is available in the services section.

How to Order Polyurethane Spacers to Size

To place an order, supply an old part sample or a drawing with dimensions and describe the task: vehicle model or equipment type, desired lift height, and load character. Based on this data the technologist will select hardness, height, and polymer formulation.

TIMOL factory produces spacers using the free-casting process: under-spring, inter-coil, adjustable, and industrial separating elements. Both single parts for repairing a specific machine and batches for a fleet or production facility are produced.

For consultation, height and hardness selection, and ordering, contact TIMOL factory. Engineers will reproduce the spacer for your vehicle or equipment.