Here's a link to Fenner Drives CEC couplings:
http://www.fennerindustrial.com/products/cec_ind.html
From looking at their on-line spec's, the 3/8" bore coupling is rated only to 51 inch-lb. Their 1/2" bore coupling is rated only to 228 inch-lb, which is about 10% below your requirement.
I was concerned that their composite couplings included carbon fiber (which is a forbidden exotic material for FIRST), but from their web-site it appears the composite is nylon-glass (which is allowable).
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