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What is the part number for the "U" shaped black Tinnerman clip used to mount a QMB switch to the interior?

Issue:
What is the "U" shaped Tinnerman clip or speed nut used with the LP9502?

Product Line:
QMB Panelboards

Environment:
Maintenance

Cause:
Replacement

Resolution:
The U shaped clip is a 1/4-20 Tinnermann clip. The part number is 23301-02203.
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