the wireline entry port with the wear bushing 318 inserted provides a bore 104 substantially equivalent to the central bore of the tool 103 providing this wireline tool entry port to the drill string permits full sized downhole tools to be inserted in the drill string without disconnecting the drill string below the sub thereby eliminating unnecessary rig idle time in deep water projects while providing a tool which supports as much tensile loading as the drill pipe to which it is attached the high tensile loading top entry sub shown in fig1 provides two wear bushings or rings 318 and 208 to hold the wireline or coiled tubing off the interior wall of the sub while still allowing the introduction of wireline tools and coiled tubing tools through the bowen fitting while the drill string is suspended from the box connection on the tool the internal wear surfaces provided by the one or more bushings along with the axial alignment of the tool over the longitudinal axis of the drill string which prevents the introduction of bending moments which can unduly stress the tubular connections either above or below the tool provides the benefits of the prior art side entry sub with the benefits of the prior art top entry sub since the apparatus of the present invention provides an axially aligned tool which is designed to be stronger than the weakest drill pipe connection in the entire drill string which also permits wireline tools to be inserted in the well bore without disconnecting.