Bosch:
https://www.boschrexroth.com/en/xc/products/product-groups/assembly-technology/basic-mechanic-elements/strut-profiles/index
20 = 6mm slot, 5.5mm center, M6 center scrws
30 = 8mm, 7.3mm center, M8 center screws
40 = 10mm, 10mm center, M12 center screws?
45, 50, 60 = 10, 10mm center
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Nut 10: 10mm base, 20mm top, depth?
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M6 Low Profile
http://us.misumi-ec.com/pdf/mold/us_12e_mo1193.pdf
http://us.misumi-ec.com/vona2/detail/110300244240/
http://onlinecatalog.tpa-us.com/viewitems/hexalobular-socket-head-cap-screws-low-head/ket-head-cap-screw-extra-low-head-stainless-steel-
http://www.monotaro.sg/g/00423631/
http://www.monotaro.sg/p/41490942/
http://www.weiku.com/products/4290966/Ultra_low_head_bolt_with_hex_socket.html
http://www.weiku.com/products/4290966/Ultra_low_head_bolt_with_hex_socket.html
Not quite extra low:
http://products.coburnmyers.com/viewitems/metric/low-head-socket-cap-screws-din-7984
NZ Tarrif:
Aluminium bars, rods and profiles 76.04
Of Aluminium – not alloyed
76.04.10
Of Aluminium Alloys
7604.21.00 Hollow Profiles
7604.29 Other
https://www.boschrexroth.com/en/us/products/product-groups/goto-products/goto-assembly-technology/connection-elements/t-nuts-t-bolts/index
https://www13.boschrexroth-us.com/catalogs/R999001283_Aluminum_Framing_8_0_2016-03_media.pdf
https://dc-us.resource.bosch.com/media/us/products_13/product_groups_1/goto_products/goto_documentation/usl00015.pdf
www.fastenal.com/
https://www.damencnc.com/en/components/aluminium-profiles/profile-connectors#p178
Chongqing
- aluminium producer, land bound except 3 gorges dam will allow access from sea eventually
Shandong Aluminum Company, Pingguo Aluminum Company, Shanxi Aluminum Plant and the Lanzhou Aluminum Plant
China’s largest private aluminum producer was founded in 1994 and is headquartered in Zouping, Shandong. China Hongqiao Group Limited is a subsidiary of China Hongqiao Holdings Limited
China Power Investment Corporation’s
Shandong Xinfa Aluminum Group Co. Ltd Founded in 1972 and headquartered in the Shandong Province of eastern China, the company has over 50 subsidiaries in power generation, alumina and aluminum refining, carbon production and downstream aluminum product manufacturing.
East Hope Group