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://teppan-ichiba.com/

Extruded Aluminum
http://shop.smartdiys.com/ sells lots of build materials in Japan, including Openbuilds V-slot extruded aluminum:
 * http://shop.smartdiys.com/products/detail.php?product_id=61

The following shops sell direct, and take internet orders


 * http://www.nic-direct.jp/
 * http://fa.sus.co.jp/
 * http://www.monotaro.com/g/00263340/

Monotaro also has a wide selection of extrusion, as well as all the other parts:
 * Aluminum Frame materials

Mechanical Parts

 * http://jp.misumi-ec.com/

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:
 * http://www.powers-rainbow.com
 * http://jp.rs-online.com/web/c/pneumatics-hydraulics-power-transmission/power-transmission-gears/worm-gears/