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2. Hole punch - Wikipedia

   en.wikipedia.org/wiki/Hole_punch

   The diameter of the holes varies between manufacturers, with typical values being 1 ⁄ 4 to 5 ⁄ 16 inch (6 to 8 mm). The 5 ⁄ 16 value is most commonly used, as it allows for looser tolerances in both ring binder and paper punching.

3. Knockout punch - Wikipedia

   en.wikipedia.org/wiki/Knockout_punch

   A 3/4 inch conduit size punch actually punches a hole that is approximately 1.1 inches diameter for 3/4 nominal size conduit. A dimensional size punch makes a hole very close to the indicated size. Punch sets are available on both imperial and metric sizes. Chassis punches are available in a number of shapes, round being the most common.

4. Punched tape - Wikipedia

   en.wikipedia.org/wiki/Punched_tape

   Tape for punching was usually 0.00394 inches (0.100 mm) thick. The two most common widths were 11 ⁄ 16 inch (17 mm) for five bit codes, and 1 inch (25 mm) for tapes with six or more bits. Hole spacing was 0.1 inches (2.5 mm) in both directions. Data holes were 0.072 inches (1.8 mm) in diameter; sprocket feed holes were 0.046 inches (1.2 mm). [8]

5. Punching - Wikipedia

   en.wikipedia.org/wiki/Punching

   The clearance is also dependent on the hardness of the workpiece. The punch press forces the punch through a workpiece, producing a hole that has a diameter equivalent to the punch, or slightly smaller after the punch is removed. All ductile materials stretch to some extent during punching which often causes the punch to stick in the workpiece.

6. Punch (tool) - Wikipedia

   en.wikipedia.org/wiki/Punch_(tool)

   A punch is a tool used to indent or create a hole through a hard surface. They usually consist of a hard metal rod with a narrow tip at one end and a broad flat "butt" at the other. When used, the narrower end is pointed against a target surface and the broad end is struck with a hammer or mallet , causing the blunt force of the blow to be ...

7. Pritchel - Wikipedia

   en.wikipedia.org/wiki/Pritchel

   The horseshoe is heated and a hole is punched through 90 percent of the steel with a forepunch or drift punch. The pointed end of the tool should be kept sharp so that the burr is cut out smoothly. The punched hole is lined up over the pritchel hole and the pritchel is driven into the hole, knocking out the remaining metal at the bottom of the ...