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clutch button uses in the gear box, the coupling, the gear box, the brake FOR TRACTOR 1. Copper-base P/M friction material,clutch button bronze friction plate,bronze friction disc dry type: Average coefficient of kinetic friction μd=0.20 0.25; Coefficient of friction of rest μs=0.42 0.47; Rate of wear <3.0×10-7cm3/J 2. wet (gumming): Average coefficient of kinetic friction μd=0.05 0.08; Coefficient of friction of rest μs=0.12 0.17; Rate of wear <2.5×10-8cm3/J 3. the product widely applies in general domains and so on machinery, engineering machinery, farm machinery, ships machinery, automobile and war industry machinery. 4. copper base friction disk and antithesis steel disk:Mainly uses in the gear box, the coupling, the gear box, the brake and so on; 5.model application: Big, middle, the low power ship uses the gear box, the car loader, the bulldozer, the excavator, the road roller, the hoist crane, heavy automobile, tractor, press, and so on