Step 2. Move your T-bones to the medium heat side of your grill and continue grilling. If you like your T-bone medium rare, grill for four to five minutes on each side or until a meat thermometer reads 130 to 140 degrees Fahrenheit.For a medium steak, grill six to seven minutes per side or until a meat thermometer reads 140 to 150 degrees.iming and technique are the keys to grilling a 1-inch-thick T-bone steak to perfection. This thicker cut requires different treatment from a T-bone, for example, 1/2- to 3/4-inch thick.