In mid-2008 DEMU adapted its female socket bars. The 2010/3010 female socket bar has been replaced by type 4010. Male connector bar 2020 is unchanged and fits in 2010, 3010 and 4010. Type 4010 has a turn-in length (a size) that meets the constructive requirements for coupling, fixing and lifting. The 4010 is also not oversized so time can be saved on the building site when turning in. The lengths of the female socket bars have (sometimes) also had minor adaptations.

The screw-in length of the 4010 female socket bars is between the old 2010 and 3010. The a size suffices with regard to the 1.5 times the thread diameter parameter. The a size is also matched with the lifting gear. Obviously the system remains suitable for coupling.