Our company AFT Inc. has been making nitro clutches since 1985. If you look at a Boninfante non rigid style nitro clutch you will see that they have copied ours exactly, real original right? We also make a rigid style cover. We have made over 950 titanium nitro cluches since we started. We also make cannons and controllers. The clutches (cover, pressure plate and flywheel) are all made out of 6al-4v titanium.
When you say that Boninfante is the primary supplier of the clutches themselves you would be mistaken, as many of the teams manufacture their own hats, pressure plates and flywheels. We have many of the teams that make their own titanium components, buy levers (the most important part of the clutch) carbides and facings from us.
Boninfante does however control the market in discs.
The cannons we make are made from aluminum and magnesium (the center section or housing being mag) and the rest being aluminum, except for the piston which is either steel or titanium. Ours is a hydraulic cannon, I believe that the Automan cannon is air operated. JT Stewart makes a cannon as well.
-Steve