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Static and kinetic friction values

The following table shows a selection of frequently used values ​​of the coefficients for static friction µ0 (static coefficient) and sliding friction µ (also called friction values).

static
coefficient µ0
dry
lubricatedkinetic
friction µ

dry
lubricated
Aluminium alloy-
Aluminium alloy
0,15…0,60
Brake lining-Steel0,50…0,600,20…0,50
Chrome-Chrome0,41
Copper-Copper0,60…0,70
Iron-Iron1,0
Leather sealing-Metal0,600,200,20…0,250,12
Nickel-Nickel0,39…0,70
POM-H -- PA6.60,5
POM-H slide modified -- PA6.6 slide modified0,14
POM-H -- PE-HD0,3
POM-H -- PE-HD slide modified0,15
S235JR-S235JR polished0,15
Steel-Copper0,23…0,29
Steel-Gray cast iron0,18…0,240,100,17…0,240,02…0,21
Steel-Ice0,0270,014
Steel-Lead0,50
Steel-PA0,32…0,450,10
Steel-PTFE0,04…0,22
Steel-“S”green~0,20
Steel-Steel0,45…0,800,100,40…0,700,10
Steel-Tin0,60
Steel-White metal0,21
Wood-Metal0,50…0,650,100,20…0,500,02…0,10
Wood-Wood0,40…0,650,16…0,200,20…0,400,04…0,16

Explanations of the material names

PA: Polyamid

PE: Polyethylen

POM: Polyoxymethylen

PTFE: Polytetrafluoräthylen or Polytetrafluorethylen

S235JR: Material number 1.0038

“S” green: PE-based plastic, also known as Murtfeldt “S” green, standard material for sliding guides

White metal: Alloys of lead and tin

Here are some engineering mechanics exercises regarding friction.