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

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

Holtest Micrometer SETS:

# 368-917: 0.5″ – 0.8″

• Individual Ranges: 0.5 – 0.65″ // 0.65 – 0.8″
• Setting Rings Included: 0.65″ DIA.

# 368-918: 0.8″ – 2.0″

• Individual Ranges: 0.8 – 1.0″ // 1.0 – 1.2″ // 1.2 – 1.6″ // 1.6 – 2.0″
• Setting Rings Included: 1″ DIA., 1.6″ DIA.

# 368-919: 2″ – 4″

• Individual Ranges: 2.0 – 2.5″ // 2.5 – 3.0″ // 3.0 – 3.5″ // 3.5 – 4.0″
• Setting Rings Included: 2.5″ DIA., 3.5″ DIA.