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Hole Arrangement




Hole Size and Pitch




Open Area


Open Area is the ratio between the total area of the holes and total sheet area.  Normally it is expressed as percent.


Open Area Formula


Round Hole, 60°  Staggered                                                   Round Hole, Straight Row




Round Hole,45° Staggered                                                 Square Hole, Staggered




Square Hole, Straight Row                                            Round End Slot, Z Type Staggered




Round End Slot, Straight Row                                         Round End Slot, K Type Staggered                         




Square End Slot, Z Type Staggered                                       Square End Slot, Straight Row




Square End Slot, K Type Staggered



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