Series-368-02
Mitutoyo

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

The Holtests Series 368 is a versatile, self-centering, three-point inside micrometer for precise and efficient inside diameter measurement.

Three equally spaced measuring rods, each 120° apart, provide contact with the inside wall surface and are centered for precise inside diameter measurement.

Download Catalogue
Categories: ,

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.

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 No Model Range Head Assy Order No. Accuracy Remarks
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 –
368-161 HT-8R 6-8mm 04AZB136 2µm –
368-162 HT-10R 8-10mm 04AZB137 2µm –
368-163 HT-12R 10-12mm 04AZB138 2µm –
368-164 HT-16R 12-16mm 04AZA719 2µm with titanium coated contact points
368-165 HT-20R 16-20mm 04AZA720 2µm with titanium coated contact points
368-166 HT-25R 20-25mm 04AZA728 3µm with titanium coated contact points
368-167 HT-30R 25-30mm 04AZA729 3µm with titanium coated contact points
368-168 HT-40R 30-40mm 04AZA737 3µm with titanium coated contact points
368-169 HT-50R 40-50mm 04AZA738 3µm with titanium coated contact points
368-170 HT-63R 50-63mm 04AZA750 3µm with titanium coated contact points
368-171 HT-75R 62-75mm 04AZA751 3µm with titanium coated contact points
368-172 HT-88R 75-88mm 04AZA752 3µm with titanium coated contact points
368-173 HT-100R 87-100mm 04AZA753 3µm with titanium coated contact points
368-174 HT-125R 100-125mm 04AZA775 5µm with titanium coated contact points
368-175 HT-150R 125-150mm 04AZA776 5µm with titanium coated contact points
368-176 HT-175R 150-175mm 04AZA777 5µm with titanium coated contact points
368-177 HT-200R 175-200mm 04AZA778 5µm with titanium coated contact points
368-178 HT-225R 200-225mm 04AZA779 5µm with titanium coated contact points
368-179 HT-250R 225-250mm 04AZA780 5µm with titanium coated contact points
368-180 HT-275R 250-275mm 04AZA781 5µm with titanium coated contact points
368-181 HT-300R 275-300mm 04AZA782 5µm with titanium coated contact points

Related products