78XTZ-312 Starrett Internal Micrometer Bore Gage 1/4*-5/16*

78XTZ-312
Starrett Bore Gage
1/4″ to 5/16″ range

The 78XT Series Internal Micrometers feature
extended travel, reducing the need to exchange
anvils . The ground contact points seat the
internal micrometer faster and more accurately
than the spherical contacts found in other gages .
These rugged and accurate internal micrometers
are available individually or in economical sets
from .040-12″ (1-300mm) .

Features

• Wide measurement range without
  changing anvils
• Resolution from .0001″ (0 .0025mm) on the 2-point contact tools ranging
  up to 1/4″ (6mm) and .00025″ (0 .005mm) on the 3-point contact
  tools ranging from 1/4″-12″ (6mm – 300mm)
• Tungsten carbide measuring faces on all
  3-point heads above 1/2″ (12 .5mm)
• Ratchet stop ensures consistent
  measurements
• Self-centering contacts for true readings
• Blind bore measuring capability above
  1/2″ (12 .5mm) diameter
• Extensions available up to 6″ (150mm)
  for deep hole measuring
• Setting rings included
• Depth stop/collar also available for
  .080″- .250″ (1-6mm) range
• Each micrometer bore gage is furnished
  in a case, complete with setting ring,
  contacts, wrenches, and instructions