The D271 can be installed on a minimum door thickness of 1-3/8" when specified for a standard door thickness.
The D271 can be specified and ordered for a thick door range from 1-7/8" up to 2-¼".
The tailpiece (B520-653) is the same for all door thicknesses between 1-3/8" up to 2-¼".
The mounting screws are different for a door range greater than 1-¾". The mounting screw part number is B520-663 for 1-7/8 - 2-¼" door range.
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