Amazon.com: LEGO TECHNIC 100 pcs BLACK AXLE SIZE 4 STUDS STUD LENGTH Cross Rod Short Mindstorms robot motor part piece 3705 NXT ev3 robotics : Toys & Games
3900 Series Bearing Adaptor for LEGO Axle (6mm OD, 5mm Length) - 12 Pack - goBILDA
LEGO Ruler and Sorting Tool - Tom Alphin
Lego 4 Dark Bluish Gray technic axle 5.5L or 1 5/8 inch length with stop | eBay
3900 Series Bearing Adaptor for LEGO Axle (6mm OD, 5mm Length) - 12 Pack - goBILDA
LEGO Sets with Part 32016 Technic Connector for Axle and Pin, Angled Size #3 157.5 Degrees
Technic Axles - LEGO® Technic Axle 5.5 L with Stop - 4.4 cms - The shop Briques Passion
gears - What are the dimensions of a technic axle? - Bricks
Lego 4 Classic Dark Gray technic axle 4L or 1 inch length with stop | eBay