The length "L" of a standard cable assembly is measured from the reference planes of the connectors, if not specified differently in the order. For angled connectors the center axis is used instead.
If not specified in the order, the standard tolerances below will be used. Upon request other tolerances can be offered. But it will depend on the type of cable, the style of the connectors and possibly also on other parameters of the customer's specification. Smaller lengths tolerances may be subject to surcharge.