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Strength classes

Screws and nuts are sub-divided into different strength classes. The classification is shown by a marking on the screw head. Markings of a higher num- ber indicate stronger material. For example, a screw marked 10-9 is stronger than one marked 8-8. For this reason, it is important when fasteners are dismantled, that the screws are put back in the correct places when they are re-installed. If a bolt must be replaced check in the spare parts catalogue to make sure the correct type is used.

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