Which parts of a mechanism are replaced with graphite?

Those that suffer friction and wear without being able to be lubricated properly: bearing plates, guides, shoes, inserts, washers, and spacers. The practical rule is to replace the sacrificial element, not the structural component carrying the main load.

Does graphite last longer than a metal part?

It is not a general comparison. In dry contact or at temperature, graphite usually avoids the galling and adhesive wear that degrade metal pairs, which is why assembly life improves. Against abrasion by hard particles or impact loads, a hardened metal can still be the better choice.

How is a wear part specified?

With the drawing or reference part, plus temperature, load, speed, and counterface material. Those inputs define the grade and finish; if the current material is known, it helps narrow the equivalence.

Mechanical applications

Machine wear components

Wear components in graphite and carbon-graphite: plates, guides, inserts, and dry-friction parts.

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Replaceable wear part

Also known as: Graphite wear parts · Carbon-graphite antifriction inserts · Graphite guides · Graphite wear shoes

[ Technical summary ]

Graphite wear components are the sacrificial parts that absorb friction in a mechanism: plates, guides, inserts, and pads. They go where metal-to-metal contact produces wear, galling, or downtime from missing lubrication, and where adding grease is not viable because of temperature or process cleanliness. They are machined to size for each mechanism.

[ Problem it solves ]

Concentrate the wear of a mechanism in a replaceable, self-lubricating part, instead of letting structural components absorb it or depending on lubrication that is hard to maintain.

Processes

Dry friction
Guiding and sliding

Operating conditions

High temperature

When it is suitable

Metal-to-metal contact produces galling or accelerated wear
Grease lubrication cannot be maintained or contaminates
The mechanism works at elevated temperature
It is preferable to concentrate wear in a spare part

When it may not be suitable

There are impact or repeated shock loads
The part belongs to the load-bearing structure of the mechanism
The contact continuously carries abrasives
There is severe oxidation in air at high temperature without protection or impregnation

Process challenges

Metal-to-metal wear
Stoppages from insufficient lubrication
Grease contamination

Advantages

Self-lubrication
Low adhesion
Custom machining

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.

Load and its distributionDecisive
Sliding speedDecisive
Operating temperatureDecisive
Counterface material and finishDecisive
Geometry and tolerancesRelevant
Presence of abrasives or solidsRelevant
Atmosphere (air, inert, vacuum)Relevant

[ Required material properties ]

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

Critical properties

Friction coefficient
Wear resistance
Compressive strength
Thermal stability

Secondary properties

Flexural strength
Self-lubrication
Machinability
Dimensional stability

[ Related ]

[ Frequently asked questions ]

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

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