IBC TopFix 200 Installation Manual page 26

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Two ASD flat head screws are required to fasten one roof hook.
Figure 34: Inserting flat head screws
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Each roof hook connection must additionally be secured by a ASD countersunk screw to absorb sliding
forces at an angle of 60°.
Figure 36: Inserting countersunk screws to absorb sliding forces
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Version 17.01, as of: 27-Jun-2017
Figure 35: Inserted flat head screws