Seems to be used for making differential gearboxes, cars, and GBCs.

part image

  • 5
    It's used for many things! It's great at joining beams together at perpendicular angles. When disassembling technic sets, these are often the most challenging to get through.
    – Kirk Woll
    Jan 19, 2022 at 19:27
  • It's difficult to find a modern technic set that does NOT contain this element, it's ubiquitous... Jan 20, 2022 at 11:04
  • Vic, welcome to Bricks.SE. Does your piece take an axle or a pin in the direction we can't see from the angle of the picture?
    – chicks
    Jan 20, 2022 at 20:31
  • Thank you. It takes a pin
    – Vic
    Jan 21, 2022 at 13:09

1 Answer 1


Here you have the Bricklink link to the part: https://www.bricklink.com/v2/catalog/catalogitem.page?P=63869#T=C

enter image description here

it is named Technic, Axle and Pin Connector Perpendicular Triple on BrickLink. The ldraw/bricklin item id is 63869. The Lego design id is either 63869 or 42191, indicating that there have been at least two moulds.

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