Accu-Lock Milling Machine Vice QM series for milling machines.

Scope and features of the series milling machine vice QM

Rotary rigid-fixing machine vices of the QM seriesare used for securing workpieces on milling machines or machines with numerical control, and can also be used on cutting machines and drilling machines.
Rotary base of the QM series vices allows you to fasten workpieces with rotation in a horizontal plane, which provides a wide range of applications for the vice.
The scale printed on the rotating base of the vice is made by mechanical engraving, which ensures excellent readability of the scale and its unlimited service life. 
The clamping jaws of the machine vise are made of high quality hardened steel and then ground.
The clamping jaws are attached to the milling vise using bolts, which allows them to be replaced if necessary.
The screw design is a closed screw. The screw is protected from chips and dirt, which significantly extends the service life of the machine vice.
The needle bearing in the vice body ensures smooth clamping of the workpiece.
The machine vice can be used with or without a rotary base.
In the lower surface of the machine rigid-fixing vice there are grooves for installing fixing crackers, which allow you to more securely fasten the vice on a milling or other machine.

Features of QM series machine vices.

The design of the machine vice has a special spherical segment located in the movable jaw. The structural presence of a spherical segment in the vice makes it possible to exert a vertical force action directed downwards during the clamping of the workpiece. This design is specially designed to enhance the longitudinal horizontal compression of the workpiece. This distinctive feature of the QM series milling vice avoids vertical lifting of the workpiece when clamping it, and also prevents deformation of the surface shape of the clamped workpiece.

Milling machine vices can clamp workpieces of different widths due to the ability to reposition the clamping jaws.
The clamping jaws can be installed in four positions.

The QM series machine vice is made of high-strength ductile iron with nodular graphite, providing better impact and fatigue resistance.
More detailed information about the material of manufacture in Wikipedia

Model	Width jaws, mm	Height jaws, mm	Maximum opening jaws, mm
Accu-Lock Milling Machine Vice QM16100	100	32	100
Accu-Lock Milling Machine Vice QM16125	125	40	125
Accu-Lock Milling Machine Vice QM16160	160	45	160
Accu-Lock Milling Machine Vice QM16200	200	50	190