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M TUBING
An industry standard for copper tubing defined by the tube wall thickness, identified by a "red" stripe.

M-FACTOR
Number that indicates the relative heat retention properties of a mass.

MACADAM
Paving surface material for driveways & roads, comprised of small compacted pieces of stone. It was invented by John McAdam who combined it with tar to be make Tarmac. An asphalt binder was added and used often approximately 50 years ago, when it was called Tarmacadam.

MACERATOR
A device installed in a drain line between a toilet and the soil stack to reduce solids to liquid form.

MACHINE
A structure which is made of a framework and assorted fixed and moving parts to transmit motion or energy from one part to another, as it's used for doing some kind of work. A mechanism.

MACHINE BOLT
Hexagonal headed male fastener with threads that fit in a machine threaded part or a nut for assembly purposes.

MACHINE BRAZING
Brazing, which is a process of bonding metals together by use of an additional metal that melts at a higher temperature than 840 degrees F and lower than the melting point of the metals being joined, by use of an automatic or operator controlled heat application, often with a brazing filler metal feed. Machine brazing is often more consistent.

MACHINE SCREW
Indented head, male fastener with threads that fit in a machine threaded part or a nut for assembly purposes. They can have either Phillips heads or slotted heads.

MACHINE SHOP
Factory where powered tools and machinery to shape, cut, smooth, etc. are used to manufacture items out of metal.

MACHINE TOOL
Powered tool, which is used on metals or other materials to cut, grind, shape, etc.

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