1 2 3

4

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7 8

9 10 11

12 13

14

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18 19

20

Across

4. continuous helical groove

5. elastic body to distort

8. transmit small torque

10. reduce wear

12. rigidity of an object

15. consist flat plates

18. permanent joining

19. rotating machine element

20. mean diameter per wire diameter

Down

1. term substances

2. fluid resistance to flow

3. resist to move

6. easy connect

7. push / drive quickly

9. support moving elements

11. alternative search

13. storing energy

14. fix couplings

16. connect under tensile load

17. modifying existing one

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