Standard Locknut Miether


Product Selector

MB-56 MB Series

MB-56 - MB Series, Lockwashers, Products

MB-56

MB56 Standard Locknut Part Number

This is the most popular series of metric washers that is coupled with KM series metric locknuts.  Lockwashers engage a keyway in a shaft or adapter sleeve slot, then locks the accompanying locknut in position by bending one of the washer tabs into the nut’s outside diameter slots. 

Features and benefits

  • Fast and simple to use mating component to a locknut.
  • Specific sizes to accommodate metric applications.
  • Simple installation and removal.
  • Standard Locknut sets the industry locknut standard


  • MB lockwashers have a 25 degree tang angle.
  • Can be mounted directly to the shaft or on an adapter sleeve.
  • A new lockwasher should be used each time the corresponding KM locknut and assembly is reinstalled.
  • Unless otherwise specified, manufactured from AISI grade 1020 series steel.
  • Most suitable for applications using cams, clutches, gears, pulleys, sprockets, and other general industry power transmission applications.
Dimensions
R 11.024 INCH Bore
E 12.598 INCH Face Diameter
B 14.252 INCH Dia. over Tangs
S 1.102 INCH Key Width
X 10.748 INCH Inside Dia.
NOTAN 19 INCH No. of Tangs
T 0.945 INCH Tang Width
Q 0.118 INCH Material Thickness
Weight 150 LB/100