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Read in another language Watch this page Edit For punches used in punch presses, see Punching . Learn more This article has multiple issues. Please help improve it or discuss these issues on the talk page .  Engraving punch A punch is a hard metal rod with a sharp tip at one end and a blunt butt end at the other, which is usually struck by a hammer . Typically, woodworkers use a ball-peen hammer to strike a punch. Use Edit Punches are used to drive objects such as nails , or to form an impression of the tip on a workpiece. Decorative punches may also be used to create a pattern or even form an image.[ citation needed ] Pin Edit Pin punch Metal pins and similar connectors are driven in or out of holes using a pin punch. For removal, first use a starter punch to loosen the pin, then use a pin punch to finish. Center Edit Centre punch A center punch is used to mark the center of a point. It is usually used to mark the center of a hole when drilling holes. A drill has the tenden...

Calipers Read in another language Watch Edit Caliper detail view A caliper ( British spelling also calliper, or in plurale tantum sense a pair of calipers) is a device used to measure the distance between two opposite sides of an object. Many types of calipers permit reading out a measurement on a ruled scale, a dial, or a digital display. But a caliper can be as simple as a compass with inward or outward-facing points. The tips of the caliper are adjusted to fit across the points to be measured and then the caliper is then removed and the distance read by measuring between the tips with a measuring tool, such as a ruler . It is used in many fields such as mechanical engineering , metalworking , forestry , woodworking , science and medicine .

Torque wrench Read in another language Watch Edit A Torque wrench torque wrench is a tool used to apply a specific torque to a fastener such as a nut or bolt . It is usually in the form of a socket wrench with special internal mechanisms. A torque wrench is used where the tightness of screws and bolts is crucial. It allows the operator to set the torque applied to the fastener so it can be matched to the specifications for a particular application. This permits proper tension and loading of all parts. A torque wrench uses torque as a proxy for bolt tension. The technique suffers from inaccuracy due to inconsistent or uncalibrated friction between the fastener and its mating hole. Measuring bolt tension (indirectly via bolt stretch) is actually what is desired, but often torque is the only practical measurement which can be made. Torque screwdrivers and torque wrenches have similar purposes and mechanisms.