Coonbait,if you are talking about a steel adapter that glues into the shaft,I don't think so.
There are steel screw in adapters that come in 75 gr,100 gr and 125 gr.When combined with a brass insert,they provide a very strong setup.The only thing to watch for is that there were some problems with the standard 75 gr steel adapters breaking where yours did.This was corrected with the Premium 75 gr adapters so if you stick with those,you should be fine.
ALW,I don't know of any 5/16 steel adapters.If you need them for a 5/16" shaft,the 11/32" ones work well and are what you need.They don't work real well with 5/16" broadheads though.
I don't know how short you need.If you needed them short like for Bear Razorheads,you could grind down 125 gr steel adapters,till you hit 75 grs.That would make the shortest because the 125 is not hollow.