NSK Bearings black handle, also known as the blueing is a surface treatment method. Mainly used for carbon and low alloy steel workpiece.
 
The black handle, the workpiece is heated in a very strong alkali and oxidant solution oxidation of the surface to produce a layer thickness of 0.6 to 0.8 micron magnetic iron oxide film. Workpieces of different chemical composition and operation of the different oxide film can be a different color was black, black, reddish brown, tan, etc., its dense, with a certain strength.

NSK Bearings black handle aim:

1, so that the workpiece surface is starting to put rust role.

2, the workpiece shiny and beautiful, with commodity surface.

3, the elimination of the workpiece residual stress.



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