How to install custom hatch patterns in AutoCAD using PAT files. Copy the For AutoCAD and earlier, the default location is: C:\Program. Hatch Pattern for AutoCAD LT, AEC, ADT, Revit: Exclusive CAD & free Including AutoCAD , , , , Architecture, ADT, Mechanical etc. You can use your own AutoCAD pattern/hatch by embedding the pattern in acad. pat or add the pattern file into the support folder. Can anyone tell me how to import hatch patterns. where are the patterns found? Discussion · AutoCAD Help; Importing Hatch Patterns. AutoCAD hatch library, We have hundreds of FREE AutoCAD hatch pattern files, including wood, stone and stonework patterns. Custom Hatch patterns/ PAT-extension file basic rules: 1. File name and hatch pattern name must be one and the same. 2. One hatch pattern. The first step to download these new hatch pattern files. The new Note: For AutoCAD and earlier, the default hatch pattern location is. For AutoCAD , , , , , LT , , , , , Hatch pattern files .pat) are just ordinary text files consisting mainly of. AutoCAD has a predefined built-in hatch pattern library. But if you need to create some other types of hatch pattern, if you need custom AutoCAD hatch.