124MC Solid -Rod Inside Micrometer 50549

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 2-3" and the 50-75mm rods). Rod diameters are approximately 1/4" (6mm) on the A and B sizes, and approximately 11/32" (8.5mm) 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 furnished.

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
  • 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 
    15ROD SUB ASSEMBLY 350-500MMPT993231 
    16ROD SUB ASSEMBLY 500-650MMPT993241 
    17ROD SUB ASSEMBLY 650-800MMPT993251 
    18WRENCH, SPANNERPT057111 
    19WRENCH, ROD POINTPT191771 
    20WRENCH #3PT015261