Punchhole

Holes can be punched through a variety of materials for a variety of purposes. One of the most common uses of punched holes is for filing papers. When done on a large scale the holes are usually drilled.

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The most commonly used system for punching filing holes into paper is defined in International Standard ISO 838. Two holes with a diameter of 6?0.5 mm are punched into the paper. The centers of these holes are 80?0.5 mm apart and have a distance of 12?1 mm to the nearest edge of the paper. The holes are located symmetrically in relation to the axis of the sheet or document. Any paper format that is at least 100 mm high (e.g., ISO A7 and larger) can be filed using this system.