Mitutoyo Three/Two-Point Internal Holtest Micrometer, Series 368, 3.5" - 4.0" - 368-273

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.

Features:

• 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

See all Mitutoyo Three/Two-Point Internal Holtest Micrometers, Series 368