Aluminum

.30

Material

Sliding

Dry

Lubricated

Aluminum on aluminum

-

-

Canvas belt on rubber lagging

-

-

Canvas belt, stitched, on steel

0.20

0.10

Canvas belt, woven, on steel

0.22

0.10

Cast iron on asbestos, fabric brake material

0.35-0.40

-

Cast iron on brass

0.30

-

Cast iron on bronze

0.22

0.07-0.08

Cast iron on cast iron

0.15

0.06-0.10

Cast iron on copper

0.29

-

Cast iron on lead

0.43

0.13-0.36

Cast iron on leather

-

0.07-0.20

Cast iron on oak (parallel)

0.30-0.50

-

Cast iron on magnesium

0.25

0.133

Cast iron on steel, mild

0.23

-

Cast iron on tin

0.32

-

Cast iron on zinc

0.21

-

Earth on earth

-

-

Glass on glass

0.40

-

Hemp rope on wood

0.40-0.70

-

Nickel on nickel

0.53

0.12

Oak on leather (parallel)

0.30-0.50

-

Oak on oak (parallel)

0.48

0.16

Oak on oak (perpendicular)

0.32

0.07

Rubber tire on pavement

0.75-0.85

0.5-0.7*

Steel on ice

0.01

-

Steel, hard, on babbit

0.33-0.35

0.05-0.16

Steel, hard, on steel, hard

0.42

0.03-0.12

Steel, mild, on aluminum

0.47

-

Steel, mild, on brass

0.44

-

Steel, mild, on bronze

0.34

0.17

Steel, mild, on copper

0.36

0.18

Steel, mild, on steel, mild

0.57

0.09-0.19

Stone masonry on concrete

-

-

Stone masonry on ground

-

-

Wrought iron in bronze

0.18

…

Wrought iron on wrought iron

0.44

0.08-0.10