LEGO part 61904: Technic Axle and Pin Connector Block 4 x 3 x 2 1/2 [Linear Actuator Holder]

LEGO part 61904, Technic Axle and Pin Connector Block 4 x 3 x 2 1/2 [Linear Actuator Holder], belongs to the Technic Connectors category. It exists in 2 colours and appears in 32 sets of our database, from 2008 to 2026, for a total of 71 listed pieces. Its most common colour is Dark Bluish Gray.

Number 61904 identifies the shape and is moulded under the part. Each colour also has its own element ID, the one Pick a Brick uses: in dark bluish gray, it is 6356106.

Part 61904 through the years

The oldest set in our database that contains part 61904 is 8294 Excavator, released in 2008 in the Technic theme. It is still in use: the most recent set featuring it, 4000048 Bugatti Type 35, dates from 2026.

Its peak year is 2010, with 4 sets containing it. The set with the most copies is 42131 Cat D11 Bulldozer: 9 copies, against an average of 2.2 per set.

The part is closely tied to the Technic theme: 91% of the sets that contain it belong to it. With 32 sets, it ranks no. 2,098 of 2,731 parts in our database and no. 69 of 74 in the Technic Connectors category.

Sets containing part 61904, by period