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2. Carriage bolt - Wikipedia

   en.wikipedia.org/wiki/Carriage_bolt

   Plough bolt. The plow bolt is a flush-fitting carriage bolt, whose head is countersunk beneath the surface of the wood. The plow bolt was devised to hold replaceable plowshares to the moldboards of iron plows. The share, the fastest-wearing part of the plow, would be replaced several times over the life of the plow.

3. List of screw and bolt types - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_and_bolt_types

   plow bolt: plough bolt: A plow bolt is bolt similar to a carriage bolt, except the head is flat or concave, and the underside of the head is a cone designed to fit in a countersunk recess. Plow bolts provide a smooth surface for attaching a plow moldboard to its beam, where a raised head would suffer from soil abrasion. There are many ...

4. Plough - Wikipedia

   en.wikipedia.org/wiki/Plough

   A plough or (US) plow (both pronounced / plaʊ /) is a farm tool for loosening or turning the soil before sowing seed or planting. [1] Ploughs were traditionally drawn by oxen and horses but modern ploughs are drawn by tractors. A plough may have a wooden, iron or steel frame with a blade attached to cut and loosen the soil.

5. Screw - Wikipedia

   en.wikipedia.org/wiki/Screw

   Screw. An assortment of screws, and a US quarter for size comparison. A wood screw: a) head; b) non-threaded shank; c) threaded shank; d) tip. The six classical simple machines. A screw is an externally helical threaded fastener capable of being tightened or released by a twisting force (torque) to the head. The most common uses of screws are ...

6. Bolt (fastener) - Wikipedia

   en.wikipedia.org/wiki/Bolt_(fastener)

   For other uses, see Bolt (disambiguation). A bolt is an externally helical threaded fastener capable of being tightened or released by a twisting force (torque) to a matching nut. The bolt has an external male thread requiring a matching nut with a pre-formed female thread. [1]

7. Snowplow - Wikipedia

   en.wikipedia.org/wiki/Snowplow

   Snowplow. A snowplow (also snow plow, snowplough or snow plough) is a device intended for mounting on a vehicle, used for removing snow and ice from outdoor surfaces, typically those serving transportation purposes. Although this term is often used to refer to vehicles mounting such devices, more accurately they are known as winter service ...