Simpson 4×12 Beam Hanger
Simpson GLTV3.511 "Beam Hanger" that looks like it should work for a 4x12. Has a top flange to hang on wall on another beam. This product has been discontinued by Simpson. The other brackets for this size beam I found online were much lighter duty, galvanized steel. This hanger could also be a heck of a coffee table leg, if you can find two or three more (see next item). Beam "slot" is ~3 1/2" wide x 11 3/4" deep.
Rack: TOOL C
Width: 10 in.
Height: 12.25 in.
Time in Stock: Less than 1 month