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.
• Always replace self-locking bolts. For exceptions, see the Overviews.
• Always replace corroded bolts and nuts.
• Threaded bolt holes where self-locking bolts or bolts with locking compound that 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.
• The specified tightening specifications apply to standard tools. When using socket wrenches a correction value must be considered.

Self-tapping bolts:

• Installing into existing threads: position the self-tapping bolts by hand and insert until they find the old threads. Then tighten the bolts to the 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 tightening specifications.