About Hex & Jack Screws Accurate Screw Machine offers fast delivery of all sizes (Metric & Standard) of stock hex & stock jack screws, custom hex & custom jack screws and other electronic hardware in large, small or prototype quantities. We serve the computer, consumer electronics, aerospace, medical, telecommunication equipment manufacturing and the metal fabricating industries. Off-the-shelf orders are usually filled the same day, custom orders are usually completed in one week or less.