Bolts And Nuts

• All threaded connections must be tightened to specifications to ensure a secure operation in traffic.
• Loosen the bolts opposite the tightening sequence.
• Loosen or tighten bolts or nuts that do not have a specified tightening sequence in a diagonal sequence in stages.
• Always replace self-locking nuts.
• Self-locking bolts must always be replaced; refer to the overviews for any exceptions.
• Always replace corroded nuts and bolts.
• Threaded bolt holes where self-locking bolts or bolts with locking compound will be installed must be cleaned (for example, using a thread tap). Otherwise there is the risk that the bolts could break off when they are removed again.
• Threads in blind holes must be free of fluids and contamination.
• The tightening specifications given apply to non-lubricated bolts and nuts.

Installing self-tapping bolts:

• Installing in existing threads: position the self-tapping bolts by hand and tighten until they find the old threads. Then tighten the bolts to the specified tightening specifications.
• Install in the new tapping threads: position the self-tapping bolts on the holes and install all the way under light pressure. The bolts cut a new thread by doing so. Then tighten the bolts to the specified tightening specifications.