Jr. Posted November 10, 2021 Report Share Posted November 10, 2021 What type of bits do the Dewalt model # D25551 , Type 2. 1 9/16"rotary drill/ hammer drill/ hammer combo. uses??? Also what adapter chuck is recommended to use ordinary 1/2" drill bits Quote Link to comment Share on other sites More sharing options...
Jr. Posted November 10, 2021 Author Report Share Posted November 10, 2021 Specifically I needed to know the spline type design that is inserted into the chuck. Quote Link to comment Share on other sites More sharing options...
wingless Posted November 10, 2021 Report Share Posted November 10, 2021 Welcome to the forum. Here is the Owner's Manual, available in the link. That part number accepts a 12 spline bit. This adapter might work. IMO a different tool, that accepts SDS Plus or SDS Max bits is probably a better option than this dinosaur w/ weird bits. Quote Link to comment Share on other sites More sharing options...
Jr. Posted November 10, 2021 Author Report Share Posted November 10, 2021 Question. Does the D25551 uses SDS, SDS Max or SDS Plus??? I want to insert into the chuck an adapter chuck that will allow me to use more readily available bits of newer spline design. Quote Link to comment Share on other sites More sharing options...
wingless Posted November 10, 2021 Report Share Posted November 10, 2021 No to all of the above. Examine the previously linked manual. (Navigation required, then in the bottom left corner) Four model numbers use the spline drive, including the one for the OP. Three use SDS-Max bits, those have different model numbers. Quote Link to comment Share on other sites More sharing options...
wingless Posted November 10, 2021 Report Share Posted November 10, 2021 This link appears to have spline drill bits. Quote Link to comment Share on other sites More sharing options...
wingless Posted November 10, 2021 Report Share Posted November 10, 2021 Here is a spline to SDS Plus adapter. That DW5791 may be very difficult to locate. Here is one. Quote Link to comment Share on other sites More sharing options...
wingless Posted November 10, 2021 Report Share Posted November 10, 2021 One point I find interesting in the Owner's Manual does not specify a grease for the bit. My Bosch RH540M SDS-Max tool defines usage of a grease each time the bit is changed. IMO that would be a good practice to implement. Quote Link to comment Share on other sites More sharing options...
Jr. Posted November 11, 2021 Author Report Share Posted November 11, 2021 Thanks for your detailed help. It was so appreciated. Quote Link to comment Share on other sites More sharing options...
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