LEGO Sets with Part 6538b Technic Axle Joiner with X-Shaped Hole Profile and Ridges
LEGO Technic Through Axle Connector with Bushing - Pack of 8 (32039 / 42135) | eBay
the complete parts reference bricks
This axle pin is stuck. How can I remove it from the axle connector? : r/ lego
Lego® Technic 32184 Axle and Pin Connector (light bluish gray)
LEGO has designed a set that can't be taken apart | Brickset: LEGO set guide and database
Amazon.com: Gobricks GDS-1029 Technical, Axle and Pin Connector Perpendicular Split compatible with lego 92907 All Major Brick Building Blocks Technical Parts Assembles (191 Bright Light Orange(036),400PCS) : Toys & Games
10 x LEGO® Technic, Axle and Pin Connector Perpendicular Triple Black : Amazon.co.uk: Toys & Games