A pipe machining apparatus comprising: - a first section including a first portion of a frame and a first portion of a tool carrier; - a second section including a second portion of the frame and a second portion of the tool carrier, wherein the first section and the second section are adapted to be coupled together around a pipe, and, with the first and second sections coupled together, the frame is fixed relative to the pipe and the tool carrier is adapted to move relative to the frame and the pipe, and wherein the apparatus has a profile defined by an interior diameter of the frame and an exterior diameter of the frame; and - a first coupling member and a second coupling member, each adapted to couple the first section and the second section together, wherein the coupling members (104, 132) are moveable between a coupled condition, in which the coupling members (104, 132) couple the first section and the second section together, and an uncoupled condition, in which the coupling members (104, 132) do not couple the first section and the second section together, wherein the second coupling member includes - a first housing member coupled to the first portion of the tool carrier, - a second housing member coupled to the second portion of the tool carrier, an arm movably coupled to the first housing member, and an engagement member coupled to and moveable with the arm, wherein the engagement member engages the second housing member in the coupled condition and the engagement member does not engage the second housing member in the uncoupled condition, and - wherein the arm remains coupled at one end within the profile of the apparatus in both the coupled condition and the uncoupled condition, characterized in that - a first end of the first coupling member is pivotally coupled to the second section of the frame, and a second threaded end includes an adjustable engagement member adapted to be received in a recess in the first section of the frame, and - the first housing member includes a projection and the second housing member includes a receptacle adapted to receive the projection therein, - wherein the projection including arcuate side surfaces and flat opposing front and rear surfaces (176, 180), the receptacle being defined by a pair of arcuate surfaces, a protrusion on the second housing member and a surface of the tool carrier. - a first section including a first portion of a frame and a first portion of a tool carrier; - a second section including a second portion of the frame and a second portion of the tool carrier, wherein the first section and the second section are adapted to be coupled together around a pipe, and, with the first and second sections coupled together, the frame is fixed relative to the pipe and the tool carrier is adapted to move relative to the frame and the pipe, and wherein the apparatus has a profile defined by an interior diameter of the frame and an exterior diameter of the frame; and - a first coupling member and a second coupling member, each adapted to couple the first section and the second section together, wherein the coupling members (104, 132) are moveable between a coupled condition, in which the coupling members (104, 132) couple the first section and the second section together, and an uncoupled condition, in which the coupling members (104, 132) do not couple the first section and the second section together, - a first housing member coupled to the first portion of the tool carrier, - a second housing member coupled to the second portion of the tool carrier, an arm movably coupled to the first housing member, and an engagement member coupled to and moveable with the arm, wherein the engagement member engages the second housing member in the coupled condition and the engagement member does not engage the second housing member in the uncoupled condition, and - wherein the arm remains coupled at one end within the profile of the apparatus in both the coupled condition and the uncoupled condition, - a first end of the first coupling member is pivotally coupled to the second section of the frame, and a second threaded end includes an adjustable engagement member adapted to be received in a recess in the first section of the frame, and - the first housing member includes a projection and the second housing member includes a receptacle adapted to receive the projection therein, - wherein the projection including arcuate side surfaces and flat opposing front and rear surfaces (176, 180), the receptacle being defined by a pair of arcuate surfaces, a protrusion on the second housing member and a surface of the tool carrier.