Emmhic, Paco and I were having a discussion at REI climbing hardware department last night. We talked about the relative merits of TCUs versus Aliens and we covered the usual things about the TCUs being more durable, etc., Aliens supposedly being better for aid climbing, all stuff covered by this old thread.
I noticed a big difference is load capacities between TCU's and Aliens in the small sizes. Is it is real or just a matter of one manufacturer being more conservative in its ratings? If Aliens are better for aid, then why do they have the higher load capacity?
I've tried to group the cams below according to size. The Aliens all have a higher rating for their size.
Silver TCU 00, 8.9-14.5 mm, 4.4 kN
Blue Alien 3/8, 9.9-17.0, 9.3 kN
Purple TCU 0, 10.4-16.5, 4.4 kN
Green Alien 1/2, 12.7-17.0 mm, 11.6 kN
Blue TCU 1, 11.7-19.5 mm, 8.8 kN
Yellow TCU 2, 15.2-24.9 mm, 8.8 kN
Yellow Alien 3/4, 15.5-27.1 mm, 13 kN