A slot is to be milled centrally on a block with a dimension

slot dimensions in drawing   Dan slot da bar 2019

Typically I draw a dimension to the center point of the slot, rather than to both ends of it, but there is no harm in doing it this way

The 25L is the length of the slot Because it's not a circle, you do need two dimensions to determine its size (Don't confuse this with bolt The figure shows a system of two parts – machined part with slot and mating part

free play slot machine PART NAME: 12-SLOT PRO-ENGINEER GENERATED SCALE: DO NOT SCALE DRAWING OR CHANGE MANUALLY UNLESS OTHERWISE SPECIFIED TOLERANCES ON DIMENSIONS ARE:  FIGURE Grouping Dimensions 25 25 GROUP DIMENSIONS 3 Drawing Dimension Arrowheads Radius dimensions help to call out slots, curves, arcs,