The Starrett 585 micrometers have a pointed spindle and a double V-anvil, both shaped to contact the screw thread as shown in the drawing. The micrometer reading therefore gives the pitch diameter. 1-2" Range, .001" Grad, 28-30 TPI.
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L.S. Starrett
L.S. Starrett
L.S. Starrett
L.S. Starrett
L.S. Starrett
L.S. Starrett
L.S. Starrett
L.S. Starrett
L.S. Starrett