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

Series 368
Features
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



Parts Break Down


 

Inch IndividualInch SetMetric IndividualMetric Set
Order NoModelRangeHead Assy Order No.AccuracyRemarks
368-021-0.8-1in-.0001inCarbide Contact Point
368-022-.1-.12in-.0001inCarbide Contact Point
368-023-.12-.16in-.0001inCarbide Contact Point
368-024-.16-.2in-.0001inCarbide Contact Point
368-025-.2-.24in-.0001inCarbide Contact Point
368-026-.24-.28in-.0001inCarbide Contact Point
368-261HT-.35”R.275-.35in04AZB139.0001inwith titanium coated contact points
368-262HT-.425”R.35-.425in04AZB140.0001inwith titanium coated contact points
368-263HT-5”R.425-.5in04AZB141.0001inwith titanium coated contact points
368-264HT-.65”R.5-.65in04AZA721.0001inwith titanium coated contact points
368-265HT-.8”R.65-.8in04AZA722.0001inwith titanium coated contact points
368-266HT-1”R.8-1in04AZA730.00015inwith titanium coated contact points
368-267HT-1.2”R1-1.2in04AZA731.00015inwith titanium coated contact points
368-268HT-1.6”R1.2-1.6in04AZA739.00015inwith titanium coated contact points
368-269HT-2”R1.6-2in04AZA740.00015inwith titanium coated contact points
368-270HT-2.5”R2-2.5in04AZA754.00015inwith titanium coated contact points
368-271HT-3”R2.5-3in04AZA755.00015inwith titanium coated contact points
368-272HT-3.5”R3-3.5in04AZA756.00015inwith titanium coated contact points
368-273HT-4”R3.5-4in04AZA757.00015inwith titanium coated contact points
368-274HT-5”R4-5in04AZA783.00025inwith titanium coated contact points
368-275HT-6”R5-6in04AZA784.00025inwith titanium coated contact points
368-276HT-7”R6-7in04AZA785.00025inwith titanium coated contact points
368-277HT-8”R7-8in04AZA786.00025inwith titanium coated contact points
368-278HT-9”R8-9in04AZA787.00025inwith titanium coated contact points
368-279HT-10”R9-10in04AZA788.00025inwith titanium coated contact points
368-280HT-11”R10-11in04AZA789.00025inwith titanium coated contact points
368-281HT-12”R11-12in04AZA790.00025inwith titanium coated contact points
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