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常规尺寸如下表所示： 1/2" 6-13mm 5/8" 10-16mm 3/4" 11-20mm 7/8" 13-23mm 1" 16-25mm 1-1/16" 14-27mm 1-1/4" 18-32mm 1 1/2" 21-38mm 1-1/16" 14-27mm 1-1/4" 18-32mm 1-1/2" 21-38mm 1-3/4" 21-44mm 2" 27-51mm 2-1/4" 33-57mm 2-1/2" 40-63mm 2-3/4" 46-70mm 3" 52-76mm 3-1/4" 59-82mm 3-1/2" 65-89mm 3-3/4" 72-95mm 4" 78-101mm 4-1/4" 84-108mm 4-1/2" 91-114mm 4-3/4" 95-120mm 5" 105-127mm 5-1/4" 110-134mm 5-1/2" 118-140mm 5-3/4" 125-146mm 6" 130-152mm 6 1/4" 133-159mm 6-1/2" 143-165mm 6 3/4" 146-171mm 7" 155-178mm