There is a newer version of this product available

446MAZ-150RL Digital Micrometer Depth Gage

446, 446M Digital Micrometer Depth Gages
Micrometer Depth Gage, Ratchet Thimble, 0-150mm Range, 0.01mm

The Starrett 446, 446M Series Digital Micrometer Depth Gage is a mechanical digital depth micrometer - simple to use even by the inexperienced. One feature is its clear, easily read white numbers on black background that reduces errors. 0-150mm Range, 0.01mm Grad, 6 Rods, Ratchet Stop, Lock Nut, Case.

This item is discontinued. Please consider the recommended alternative listed above or contact our special order department at (978) 249-3551 x410 for more information.

Contact Starrett



  • Clear, easily read white numbers on black background reduce errors
  • No-glare black finish on the frame
  • Measurement is read directly from the counter
  • Ring-type knurled lock nut for quick and sure locking
  • Combination ratchet and speeder for uniform pressure and quicker adjustment
  • Hardened, ground, and lapped base is 3" (75mm) long
  • Measuring rods are 5/32" (4mm) diameter and are adjustable


  • Made in America: Yes
  • Micrometer Type: Mechanical Digital
  • Range (mm): 0-150mm
  • Graduations (mm): 0.01mm
  • Base Length (mm): 75mm
  • Lock Nut Type: Ring Type Knurled
  • Measuring Rods (qty): 6
  • Rod Diameter (mm): 4mm
  • Thimble Type: Ratchet
  • Case Type: Padded Case
  • Accuracy (mm): Mic head +/-.002mm; Rods +/-.005mm




    Catalog 33 - Section 1 - Micrometers
    The L.S. Starrett Company

    In the hands of a skilled operator, the precision micrometer is the most accurate hand-held tool available. When close measurements are necessary, the micrometer is the ideal tool for the job because measurement and reading are on the same axis and the anvil end is supported by a strong frame.

    [69 pages]

3D CAD Files / Exploded Parts Diagram

    Login to see related product files. Or create an account.

Product Testimonials

    Write a product review


      Member of Kit
      Item #DescriptionPart No.QtyInformation
      2SHELL, ADJUSTING24536-01
      3SPRING, BARREL10058-01
      4NUT, .375-52PT164141
      5SPINDL SCR, .294-1/219493-M1
      6SCREW, 1/16-64 SLOT X .041 LONG23607-01
      7SHELL, MICROMETER19495-M1
      8CAP, SHELL19496-01
      9RING, BINDER19141-01
      10SPRING, .089X.107X.062X.009X213207-01
      11LOCK PIN, DIG MIC19762-01
      13WINDOW, METRIC #216MPT191081
      14SCREW, .052-80 SLOT X .173 LONGPT192902
      15SCREW, .052-80 SLOT X .111 LONGPT191422
      17•CAP ASSEMBLYPT994451
      20•BODY, RATCHET #44619802-01
      21•PIN, RATCHET .066D X .156LPT189761
      22•SPRING, .041X.061X.188X.010X6PT076731
      23•SCREW, #2-64 SLOT X .204 LONGPT197721
      240-25MM ROD ASSEMBLYPT993911133.75MM LNG
      2525-50MM ROD ASSEMBLYPT993921158.75MM LNG
      2650-75MM ROD ASSEMBLYPT993931184.15MM LNG
      2775-100MM ROD ASSEMBLYPT993941209.55MM LNG
      28100-125MM ROD ASSEMBLYPT993951234.16MM LNG
      29125-150MM ROD ASSEMBLYPT993961259.56MM LNG
      30WRENCH #3PT015261
      32REPLACEMENT NUT, .125-40PT171211NOT SHOWNW

    California Proposition 65 Warning

      WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer, and birth defects or other reproductive harm. For more information go to: