Abstract: A wear resistant sub assembly with a sleeve with a sleeve outer diameter larger than the body outer diameter, a plurality of offset indentations formed on the outer side of the sleeve formed in rows of four to eight offset indentations along a diagonal orientation to a sleeve axis; a plurality of a metal carbide inserts providing an interference fit into each offset indentation thereby forming a wear resistant sleeve; a sealing means disposed between the sleeve and the body and at least two spring locking apparatus engaging locking indentations on the body.

Abstract: An apparatus for protecting a sub assembly inside a borehole of a well, with a sleeve having a sleeve outer diameter larger than the body outer diameter; a plurality of offset indentations formed on the outer side of the sleeve formed in rows of 4 to 8 offset indentations along a diagonal orientation to a sleeve axis; a plurality of a metal carbide inserts providing an interference fit into each offset indentation thereby forming a wear resistant pad on the outer side of the sleeve; a sealing means disposed between the sleeve bottom beveled edge and the body forming a sealed sub assembly using at least two spring locking apparatus engaging locking indentations on the body.

Abstract: A collar for protecting a body inside a borehole of a well, with a collar outer diameter larger than the body outer diameter, a plurality of offset indentations formed on the outer side of the collar formed in rows of four to eight offset indentations along a diagonal orientation to a collar axis. A metal carbide inserts engages each offset indentation with an interference fit forming a wear resistant pad on the outer side of the collar. A sealing means is disposed between a bottom beveled edge of a collar and the body forming a sealed sub assembly. At least two spring locking apparatus engaging a locking portion on the body.