643J Dial Depth Gage

643 Dial Depth Gages
Dial Depth Gage with Knife Edge, 0-.125" Range, 0-25-0 Dial, .0005" Graduations

The Starrett 643 Dial Depth Gage has a knife-edge base and a needle point contact which has been hardened and ground. The knife-edge base has a cutout so that the conical point can be precisely positioned for close work. Point is 1/2" (12.7mm) long with a 40 Deg included angle. In action, the inspector gently pushes the point down to read zero with the base and then pushes down to make the needle point contact the workpiece to take the measurement. 0-.125" Range, .0005" Grad, 0-25-0 Dial.

Contact Starrett


  • Hardened, ground needle point contact
  • Knife-edge base which can be precisely positioned for close work
  • Point is 1/2" (17.7mm) long with a 40 degree included angle
  • Case is not included
  • 0-.125" Range
  • .0005" Graduation
  • 0-25-0 Dial Reading


  • Made in America: Yes
  • Range (in): 0-.125"
  • Graduations (in): .0005"
  • Dial Reading: 0-25-0


    2D Dimensional Drawing (PDF)



    58.24 kb

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
      10BASE, #64308228-01
      30SCREW, #4-48 SHCS X .375 LONGPT077612
      40SCREW, #3-56 SLOT X .556 LONGPT093522
      60BACK, INDICATOR #25PT261601
      70SCREW, #3-56 PHILLIPS X .190 LONGPT093074
      90•BEZEL IND., PLASTICPT234161
      100•CRYSTAL, #25PT066221
      110SPR WSHR,1.593X2.020X.01506662-01
      120HAND, #25PT083081
      130DIAL, REG. 643-13111158-21
      140CASE SUB-ASSEMBLY09340-101
      150•PIN, RACK GUIDE #25PT068481
      160•SPR, .105X.125X.56306888-01
      170•PUSHBUTTON #64007197-01
      180•CONTACT POINT #643PT082291
      200•SCREW, #1-64 SLOT X .154 LONGPT093482
      210•RACK, .125 RANGE09540-01
      220•CASE SUB-ASSEMBLY,#25 TOP LIFTPT227031
      230•BEZEL CLAMP, PLASTIC23417-01
      240•SCREW, .140-40 CLAMP X .281 LONGPT111551
      250BRIDGE/PLATE ASSEMBLY09315-01
      260•PLATE SUB ASSEMBLY09392-01
      300••BRIDGE #2509414-01
      310••BEARING, JEWEL #25PT094221
      330••PIN, .094X.30009425-02
      340•PINION, HANDPT089731
      350•GEAR, RACK ASSEMBLYPT092991
      360•SCREW, #3-56 PHILLIP X .263 LONGPT094244
      370•HAIRSPR GEAR ASSEM.PT092891
      380•POST, HAIRSPRING09418-01
      390•SCREW, #1-64 SLOT X .148 LONG23449-01

    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: www.P65Warnings.ca.gov