Tag Archives: Dynamic friction

Friction coefficients

Friction coefficients

Material 1Material 2Static dryStatic lubricatedDynamic dryDynamic lubricated
SteelSteel0.50.10.40,1-0,05
SteelCast iron0.20.10.180,1-0,05
SteelCu-Sn alloy0.20.10.10,06-0,03
SteelPb-Sn alloy0.150.10.10,05-0,03
SteelPolyamide0.30.150.30,12-0,03
SteelPTFE0.040.040.040.04
Steelfriction lining0.60.30.550,3-0,2
SteelWood0.550.10.350.05
WoodWood0.50.20.30.1
Cast ironCu-Sn alloy0.250.160.20.1
RubberCast iron0.50.45
Rolling elementSteel0,003-0,001
AluminumAluminum1,05-1,350.31.4
AluminumMild steel0.610.47
BrassCast iron0.3
BronzeCast iron0.22
Cast ironCast iron1.10.150.07
CopperStainless steel (304)0.230.21
GlassGlass0,9-10,1-0,60.40,09-0,12
GlassMetal0,5-0,70,2-0,3
GraphiteGraphite0.10.1
GraphiteSteel0.10.1
NylonNylon0,15-0,25
PolystyrenePolystyrene0.50.5
PolystyreneSteel0,3-0,350,3-0,35
SteelBrass0.350.19
Mild steelBrass0.510.44
Mild steelCast iron0.180.230.13
TeflonSteel0.040.040.04
Titanium AlloyAluminium Alloy0.410.38
Titanium AlloyTitanium Alloy0.360.3
Titanium AlloyBronze0.360.27

The friction coefficient depend on several factors: contact pressure, surface roughness, temperature, sliding velocity, type of lubricant  and level of contamination.
Static coefficients of friction are higher than the dynamic or kinetic values. 

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