124MCZ Solid -Rod Inside Micrometer 56143

The Starrett 124M Solid -Rod Inside Micrometer Sets are the most popular inside micrometers because of their lightness, ease of use, and range. They are very useful for measuring inside diameters of cylinders and rings and measuring parallel surfaces. The desired range is obtained by assembling rods and spacing collars to the micrometer head. Measuring rods are provided with a shoulder that is set accurately in the micrometer head and locked in position. When assembling rods to the A and B heads, the reading line on the micrometer head should be lined up with the marking on each rod (except for the 50-75mm (2-3") rods). Rod diameters are approximately 6mm (1/4") on the A and B sizes, and approximately 8.5mm (11/32") on the C size. Each rod has individual length adjustment for the anvil by means of special wrenches furnished 200-800mm, 0.01mm Grad, 4 Measuring Rods with Case.

Open Starrett-3D Parts Catalog

Contact Starrett


  • Insulated rods marked with length
  • Adjustable for length
  • Measuring rods are solid
  • Hardened and ground anvils
  • Quick-reading figures
  • 6-1/2" (165mm) long handle is available (124H)


  • Micrometer Type: Inside Micrometer Set
  • Range (mm): 200-800mm
  • Graduations (mm): 0.01mm
  • Measuring Rods (qty): 4
  • Case Type: Padded Case
  • Accuracy (mm): Lead accuracy +/-.003mm per 25mm


    Member of Kit

    Item #DescriptionPart No.QtyInformation
    2•SPRING, BARREL10058-01 
    3•BODY,METRIC #124MC22693-01 
    4•NUT, .375-52PT164141 
    5•SHELL, ADJUSTING17788-01 
    6•SPINDL SCR, .294-1/217790-01 
    7•CAP, SHELL01540-01 
    8•HANDLE, SHORTPT01546A2 
    9•NUT, .437-40PT073861 
    10•CHUCK, ROD07387-01 
    11•SHELL, OUTSIDE-MET.17786-01 
    12COLLAR, LARGE07389-M1 
    13COLLAR, SMALL07390-M1 
    14ROD SUB ASSEMBLY 200-350MMPT993221 
    17ROD SUB ASSEMBLY 350-500MMPT993231 
    21ROD SUB ASSEMBLY 500-650MMPT993241 
    25ROD SUB ASSEMBLY 650-800MMPT993251 
    29WRENCH, SPANNERPT057111 
    30WRENCH, ROD POINTPT191771 
    31WRENCH #3PT015261