Why use graphite bushings instead of lubricated metal?

Graphite is self-lubricating dry, thermally stable, and compatible with vacuum or atmospheres where oils and greases fail or contaminate. Ideal for bushings, spacers, and rotary inserts.

What data do you need to quote a graphite bushing?

OD × ID × length (or drawing), quantity, temperature, atmosphere, load/speed, and current or preferred grade. With that we recommend isostatic, extruded, or carbon-graphite.

What is the advantage of an insert over a full graphite bushing?

The insert separates the structural function from the sliding function: the metal carrier takes the load and the fixing, and the graphite only takes the friction. That allows thinner graphite walls, cheaper replacement, and better behaviour when the housing must retain stiffness.

How is the insert retained in the carrier?

By press fit, mechanical retention, or a machined shoulder that prevents axial movement. The fit must be calculated knowing that graphite and metal expand differently, so it neither loosens when hot nor cracks during cold assembly.

What data is needed to quote it?

Inside and outside diameter of the insert, length, tolerances, and type of fit, plus temperature, load, speed, and the material of the shaft and carrier.

Mechanical applications

Machine rotary bushing inserts

They improve the durability and performance of bushings in rotating systems.

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Replaceable sliding insert

Also known as: Graphite bushing inserts · Graphite liners · Rotary antifriction inserts · Carbon-graphite insert sleeves

[ Technical summary ]

Graphite inserts for rotary bushings are the inner liner that takes the shaft friction, mounted inside a metal carrier. By separating the wear part from the housing, maintenance is reduced to replacing the insert instead of regrinding or replacing the assembly. Graphite provides dry sliding and temperature tolerance in continuously rotating mechanisms.

[ Problem it solves ]

Isolate the wear of a rotary bushing in a replaceable insert, avoiding relubrication of the mechanism or work on the housing each time the rubbing surface is exhausted.

Processes

Continuous rotation
Dry sliding

Operating conditions

Moderate loads

When it is suitable

Rotation is continuous and relubrication cannot be sustained
Only the rubbing surface should be replaced, not the housing
Mechanism temperature degrades the conventional lubricant
The metal carrier can seat and retain the insert

When it may not be suitable

There are impact or repeated shock loads
The insert is left without continuous support inside the carrier
The shaft is significantly misaligned or unbalanced
There is severe oxidation in air at high temperature without protection or impregnation

Process challenges

Bushing wear
Need for relubrication
Elevated temperature

Advantages

Self-lubrication
Modular replacement
Good dry-running behavior

Limitations

Oxidation in air at high temperature without protection
Lower mechanical strength than structural metals
Requires grade selection by load and environment

[ Critical selection variables ]

These variables define the grade and the geometry. Actual values are confirmed against the grade datasheet.

Rotational speedDecisive
Load and its distributionDecisive
Clearance and type of fitDecisive
Operating temperatureDecisive
Geometry and tolerancesRelevant
Counterface material and finishRelevant
Alignment and mounting stiffnessRelevant

[ Required material properties ]

Properties that guide selection. Numerical values come from each grade's datasheet.

Critical properties

Friction coefficient
Wear resistance
Compressive strength
Thermal expansion

Secondary properties

Self-lubrication
Dimensional stability
Machinability

[ Related ]

[ Frequently asked questions ]

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Technical content reviewed by ESGRAF — Last reviewed: September 8, 2026

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