Mitutoyo

Holtests – Series 368-Three Point/Two-Point Internal Micrometers

These Holtests are versatile, self-centering three-point internal micrometers for the accurate and efficient direct-measurement of internal diameters. Three anvils, evenly spaced at 120° apart, contact the internal wall surfaces and find true alignment with the axis of the bore for accurate ID measurement.

  • TiN-coated measuring contact points(over 6mm/.275″ range models) provide excellent durability and impact resistance and allow the instrument to measure right to the bottom of a blind hole.
  • Highly durable because of carbide-tipped contact points (anvils).
  • Measurement can be taken closer to the bottom of the blind bore.
  • Can measure deep holes using an Extension rod (optional) which is available on models over 6mm (.275″) measuring range.
  • With Ratchet Stop for constant force.
  • Setting Rings for zero point adjustment are optional.
  • Supplied in fitted plastic case up to 100mm / 4”. Over 100mm / 4” supplied in wooden case.
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Technical Data

Graduation: 0.001mm, 0.005mm*,
.0001″ or .0002″* (*over 12mm or .5” models)

Optional Accessories
952322: Extension rod 100mm / 3.94” For range 6-12mm / .275-.5” models
952621: Extension rod 150mm / 5.9” For range 12-20mm / .5″ – .8” models
952622: Extension rod 150mm / 5.9” For range 20-50mm / .8″ – 2” models
952623: Extension rod 150mm / 5.9” For range 50-300mm / 2″-12” models

Order NoModelRangeHead Assy Order No.AccuracyRemarks
368-001-2-2.5mm-2µm-
368-002-2.5-3mm-2µm-
368-003-3-4mm-2µm-
368-004-4-5mm-2µm-
368-005-5-6mm-2µm-
368-161HT-8R6-8mm04AZB1362µm-
368-162HT-10R8-10mm04AZB1372µm-
368-163HT-12R10-12mm04AZB1382µm-
368-164HT-16R12-16mm04AZA7192µmwith titanium coated contact points
368-165HT-20R16-20mm04AZA7202µmwith titanium coated contact points
368-166HT-25R20-25mm04AZA7283µmwith titanium coated contact points
368-167HT-30R25-30mm04AZA7293µmwith titanium coated contact points
368-168HT-40R30-40mm04AZA7373µmwith titanium coated contact points
368-169HT-50R40-50mm04AZA7383µmwith titanium coated contact points
368-170HT-63R50-63mm04AZA7503µmwith titanium coated contact points
368-171HT-75R62-75mm04AZA7513µmwith titanium coated contact points
368-172HT-88R75-88mm04AZA7523µmwith titanium coated contact points
368-173HT-100R87-100mm04AZA7533µmwith titanium coated contact points
368-174HT-125R100-125mm04AZA7755µmwith titanium coated contact points
368-175HT-150R125-150mm04AZA7765µmwith titanium coated contact points
368-176HT-175R150-175mm04AZA7775µmwith titanium coated contact points
368-177HT-200R175-200mm04AZA7785µmwith titanium coated contact points
368-178HT-225R200-225mm04AZA7795µmwith titanium coated contact points
368-179HT-250R225-250mm04AZA7805µmwith titanium coated contact points
368-180HT-275R250-275mm04AZA7815µmwith titanium coated contact points
368-181HT-300R275-300mm04AZA7825µmwith titanium coated contact points

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