The following graphics show the common bolt hole patterns with labeled dimensions. The Drilling Template Pattern codelist in the AllCodeLists.xls workbook provides a list of codes for common bolt hole patterns.
Circular Bolt Hole Pattern (two holes up)
Circular Bolt Hole Pattern (one hole up)
Square Bolt Hole Pattern
Square Bolt Hole Pattern with Offset
Rectangular Bolt Hole Pattern
Rectangular Bolt Hole Pattern with Offset
Rectangular Bolt Hole Pattern with Split Flange Face
Triangular Bolt Hole Pattern
Oval Bolt Hole Pattern