Table of friction coefficients

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First surface Second surface Condition \mu_s \mu_k \tan^{-1}(\mu_s) (radians) \tan^{-1}(
\mu_s) (degrees) \tan^{-1}(\mu_k) (radians) \tan^{-1}(\mu_k) (degrees)
Aluminimum Mild steel Dry and clean 0.61 0.47 0.55 31 0.44 25
Aluminimum Aluminimum Dry and clean 1.05 - 1.35 1.4 0.81 - 0.93 46 - 53 0.95 54
Copper Steel Dry and clean 0.53 0.36 0.49 28 0.35 20
Copper Copper Dry and clean 1.0  ? 0.79 45  ?  ?
Wood Concrete Dry and clean 0.62  ? 0.55 32  ?  ?
Wood Metal Dry and clean 0.2 - 0.6  ? 0.2 - 0.54 11.3 - 31  ?  ?
Wood Metal Wet 0.2  ? 0.2 11.3
Wood Wood Dry and clean 0.25 - 0.5  ? 0.24 - 0.46 14 - 26  ?  ?
Wood Wood Wet 0.2  ? 0.2 11  ?  ?
Mild steel Mild steel Dry and clean 0.74 0.57 0.64 37 0.52 30
Hard steel Hard steel Dry and clean 0.78 0.42 0.66 38 0.40 23

For more, see The Engineer's Handbook and Engineering Toolbox.