Buying metals and extruded aluminum in Japan
Building a machine?
Need steel for a welding course, table or project?
Need extruded aluminum?
Need gears, chains and pullys?
Steel Square pipe, round pipe and bar
Teppan-Ichiba sells direct over the internet
http://shop.smartdiys.com/ sells lots of build materials in Japan, including Openbuilds V-slot extruded aluminum:
The following shops sell direct, and take internet orders
Monotaro also has a wide selection of extrusion, as well as all the other parts:
POWERS mechanical parts
These parts can be found in a few shops in Akihabara, as well as online.
RS carries a good chunk of the POWERS small mechanical inventory: