Swivel

A swivel is a connection that allows the connected object, such as a gun

Swivel gun

The term swivel gun usually refers to a small cannon, mounted on a swiveling stand or fork which allows a very wide arc of movement. Another type of firearm referred to as a swivel gun was an early flintlock combination gun with two barrels that rotated along their axes to allow the shooter to...

 or chair

Chair

A chair is a raised surface used to sit on, commonly for use by one person. Chairs often have the seat raised above floor level, supported by four legs. A chair without a back or arm rests is a stool, or when raised up, a bar stool or high chair . A chair with arms is an armchair and with...

 to rotate horizontally and/or vertically. A common design for a swivel is a cylindrical rod

Rod

Rod may refer to:*Rod , a straight and slender stick; a wand; a cylinder; hence, any slender bar*Rod cell, a cell found in the retina that is sensitive to light/dark...

 that can turn freely within a support structure. The rod is usually prevented from slipping out by a nut

Nut (hardware)

A nut is a type of hardware fastener with a threaded hole. Nuts are almost always used opposite a mating bolt to fasten a stack of parts together. The two partners are kept together by a combination of their threads' friction, a slight stretch of the bolt, and compression of the parts...

, washer

Washer (mechanical)

A washer is a thin plate with a hole that is normally used to distribute the load of a threaded fastener. Other uses are as a spacer, spring , wear pad, preload indicating device, and locking device. Rubber washers may also be used to reduce vibration when fastening fans to computer cases...

 or thickening of the rod. The device can be attached to the ends of the rod or the center. Another common design is a sphere

Sphere

A sphere is a perfectly round geometrical object in three-dimensional space, such as the shape of a round ball. Like a circle in two dimensions, a perfect sphere is completely symmetrical around its center, with all points on the surface lying the same distance r from the center point...

 that is able to rotate within a support structure.

A swivel is a connection that allows the connected object, such as a gun

Swivel gun

The term swivel gun usually refers to a small cannon, mounted on a swiveling stand or fork which allows a very wide arc of movement. Another type of firearm referred to as a swivel gun was an early flintlock combination gun with two barrels that rotated along their axes to allow the shooter to...

 or chair

Chair

A chair is a raised surface used to sit on, commonly for use by one person. Chairs often have the seat raised above floor level, supported by four legs. A chair without a back or arm rests is a stool, or when raised up, a bar stool or high chair . A chair with arms is an armchair and with...

 to rotate horizontally and/or vertically. A common design for a swivel is a cylindrical rod

Rod

Rod may refer to:*Rod , a straight and slender stick; a wand; a cylinder; hence, any slender bar*Rod cell, a cell found in the retina that is sensitive to light/dark...

 that can turn freely within a support structure. The rod is usually prevented from slipping out by a nut

Nut (hardware)

A nut is a type of hardware fastener with a threaded hole. Nuts are almost always used opposite a mating bolt to fasten a stack of parts together. The two partners are kept together by a combination of their threads' friction, a slight stretch of the bolt, and compression of the parts...

, washer

Washer (mechanical)

A washer is a thin plate with a hole that is normally used to distribute the load of a threaded fastener. Other uses are as a spacer, spring , wear pad, preload indicating device, and locking device. Rubber washers may also be used to reduce vibration when fastening fans to computer cases...

 or thickening of the rod. The device can be attached to the ends of the rod or the center. Another common design is a sphere

Sphere

A sphere is a perfectly round geometrical object in three-dimensional space, such as the shape of a round ball. Like a circle in two dimensions, a perfect sphere is completely symmetrical around its center, with all points on the surface lying the same distance r from the center point...

 that is able to rotate within a support structure. The device is attached to the sphere. A third design is a hollow cylindrical rod that has a rod that is slightly smaller than its inside diameter inside of it. They are prevented from coming apart by flanges. The device may be attached to either end.

A swivel joint for a pipe

Pipe (material)

A pipe is round tubular section or hollow cylinder used mainly to convey media. It can also be used for structural applications. In layman's terms the appelations pipe and tube are almost interchangeable, but in industry and engineering discipline the terms are uniquely defined...

is often a threaded connection in between which at least one of the pipes is curved, often at an angle of 45 or 90 degrees. The connection is tightened enough to be water- or air-tight and then tightened further so that it is in the correct position.