THK MDK is a miniature type with a screw shaft diameter of 4 to 14 mm and a lead of 1 to 5mm.
Lubrication of BNF
For nuts, lithium soap base grease has been shipped.
(for type MBF and MDK only coated with rust preventive oil)
Since only the effective threads of the screw shaft are hardened by induction hardening (all types of BNF and BIF; MDK1405) or carburizing (all types of MBF; MDK0401-1404), it is very easy for the shaft end to undergo additional machining via a grinder or milling machine.