Patent ID: 7984869

Claim:
A refiner plate segment for refining lignocellulosic material comprising: a top surface comprising bars and grooves for refining lignocellulosic material; a bottom surface adapted to interface with a mounting surface of a refiner; a first hole in the top surface and a second hole in the bottom surface; wherein the first hole comprises a threaded portion adapted to receive a first threaded bolt and wherein the second hole comprises a threaded portion adapted to receive a second threaded bolt, wherein the first hole and second hole are the same hole through the plate segment, wherein the first threaded bolt is adapted to cinch a face-mounted plate carrier between a head portion of the first threaded bolt and the refiner plate segment, and wherein the face-mounted plate carrier comprises a collar extending beyond the bottom surface, wherein the collar rests on a portion of the plate segment circumferential to the hole such that a gap is formed, wherein the gap prevents the entire surface of the bars and grooves from contacting the face-mounted plate carrier.