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.
Order No | Model | Range | Head Assy Order No. | Accuracy | Remarks |
368-021 | – | 0.8-1in | – | .0001in | Carbide Contact Point |
368-022 | – | .1-.12in | – | .0001in | Carbide Contact Point |
368-023 | – | .12-.16in | – | .0001in | Carbide Contact Point |
368-024 | – | .16-.2in | – | .0001in | Carbide Contact Point |
368-025 | – | .2-.24in | – | .0001in | Carbide Contact Point |
368-026 | – | .24-.28in | – | .0001in | Carbide Contact Point |
368-261 | HT-.35”R | .275-.35in | 04AZB139 | .0001in | with titanium coated contact points |
368-262 | HT-.425”R | .35-.425in | 04AZB140 | .0001in | with titanium coated contact points |
368-263 | HT-5”R | .425-.5in | 04AZB141 | .0001in | with titanium coated contact points |
368-264 | HT-.65”R | .5-.65in | 04AZA721 | .0001in | with titanium coated contact points |
368-265 | HT-.8”R | .65-.8in | 04AZA722 | .0001in | with titanium coated contact points |
368-266 | HT-1”R | .8-1in | 04AZA730 | .00015in | with titanium coated contact points |
368-267 | HT-1.2”R | 1-1.2in | 04AZA731 | .00015in | with titanium coated contact points |
368-268 | HT-1.6”R | 1.2-1.6in | 04AZA739 | .00015in | with titanium coated contact points |
368-269 | HT-2”R | 1.6-2in | 04AZA740 | .00015in | with titanium coated contact points |
368-270 | HT-2.5”R | 2-2.5in | 04AZA754 | .00015in | with titanium coated contact points |
368-271 | HT-3”R | 2.5-3in | 04AZA755 | .00015in | with titanium coated contact points |
368-272 | HT-3.5”R | 3-3.5in | 04AZA756 | .00015in | with titanium coated contact points |
368-273 | HT-4”R | 3.5-4in | 04AZA757 | .00015in | with titanium coated contact points |
368-274 | HT-5”R | 4-5in | 04AZA783 | .00025in | with titanium coated contact points |
368-275 | HT-6”R | 5-6in | 04AZA784 | .00025in | with titanium coated contact points |
368-276 | HT-7”R | 6-7in | 04AZA785 | .00025in | with titanium coated contact points |
368-277 | HT-8”R | 7-8in | 04AZA786 | .00025in | with titanium coated contact points |
368-278 | HT-9”R | 8-9in | 04AZA787 | .00025in | with titanium coated contact points |
368-279 | HT-10”R | 9-10in | 04AZA788 | .00025in | with titanium coated contact points |
368-280 | HT-11”R | 10-11in | 04AZA789 | .00025in | with titanium coated contact points |
368-281 | HT-12”R | 11-12in | 04AZA790 | .00025in | with titanium coated contact points |
Order No | Range | Ind Range | Setting Rings Incld | Remarks |
368-916 | .275-.5in | .275-.35 in,.35-.425 in,.425-.5 in | .35in DIA., .5in DIA. | with extension rod |
368-917 | .5-.8in | .5-.65 in,.65-.8 in | .65in DIA. | with extension rod/titanium coated contact points |
368-918 | .8-2in | .8-1 in,1-1.2 in,1.2-1.6 in,1.6-2 in | 1in DIA., 1.6in DIA. | with extension rod/titanium coated contact points |
368-919 | 2-4in | 2-2.5 in,2.5-3 in,3-3.5 in,3.5-4 in | 2.5in DIA., 3.5in DIA. | with extension rod/titanium coated contact points |
368-920 | 4-8in | 4-5 in,5-6 in,6-7 in,7-8 in | 5in DIA., 7in DIA. | with extension rod/titanium coated contact points |
368-926 | .08-.12in | .08-1 in,.1-.12 in | .1in DIA. | – |
368-927 | .12-.28in | .12-.16 in,.16-.2 in,.2-.24 in,.24-.28 in | .16in DIA., .24im DIA. | – |
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