1. Woodworking joints may be fitted by chalking one of the mating surfaces . 2. Thus the mating surfaces to be joined must be kept clean. 3. It does so by inhibiting contact between mating surfaces , reducing friction and associated heat. 4. The mating surface seals to the cylinder head with a rubber O-ring style gasket. 5. The main wear in electromagnetic couplings occurs on the faces of the mating surfaces . 6. It has a good abrasion resistance but is better suited to soft mating surfaces . 7. Mated surfaces between touching parts like gears are often sized.8. Other failure modes are severely grooved / damaged clutch mating surface , grease loss, and cracking. 9. An HSK toolholder has both a tapered shank, and a flange with a mating surface . 10. A resultant colossal mate surfaces , watches him die, and sinks down again to the seabed.