The standard architectural hatches — concrete, brick, CMU, stone/rubble, earth, gravel, sand, wood grain & end-grain, batt and rigid insulation, steel, plus plain 45°/crosshatch and solid poché — as real SVG patterns. Set the repeat true to your drawing scale, pick a pen weight and rotation, and read the density you'll actually get on the sheet.
Runs entirely in your browser — nothing is uploaded. Export a filled sample as SVG sized in real millimetres (imports true-scale into Illustrator/CAD) or PNG, or copy the SVG <pattern> definition to reuse in your own drawings.