Features:
- Ease-of-use, which provides fast (yes or no) dimensional information that rarely calls for human judgment
- Portable and independent of power, which means they can be used anywhere in the shop without additional equipment
- Allows for accurate alignment between spindle tools and their supporting members
- Provides information as to whether more contact is required to drive a tool
There are a number of standards that define taper shank dimensions, and Locher, Inc. can provide taper gages to meet the criteria for many of them.
Morse Taper
These types of shanks are used on a variety of tools, and exclusively on the shanks of twist drills. The taper for this standard is approximately 0.625 inch per foot, in most cases.
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| No. of Taper | Taper per Foot | Taper per Inch | Small End of Plug D | Diameter End of Socket A | Shank | Depth of Hole H | |
| Length B | Depth S | ||||||
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0 1 2 3 4 5 6 7 |
0.62460 0.59858 0.59941 0.60235 0.62326 0.63151 0.62565 0.62400 |
0.05205 0.04988 0.04995 0.05019 0.05193 0.05262 0.05213 0.05200 |
0.252 0.369 0.572 0.778 1.020 1.475 2.116 2.750 |
0.3561 0.475 0.700 0.938 1.231 1.748 2.494 3.270 |
2 11/32 2 9/16 3 1/8 3 7/8 4 7/8 6 1/8 8 9/16 11 5/8 |
2 7/32 2 7/16 2 15/16 3 11/16 4 5/8 5 7/8 8 1/4 11 1/4 |
2 1/32 2 5/32 2 39/64 3 1/4 4 1/8 5 1/4 7 21/64 10 5/64 |
Jarno Taper Shanks
This taper is based on simple formulas that require almost no calculations, when the number of taper is known.
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| Number of Taper | Length A | Length B | Diameter C | Diameter D | Taper per Foot |
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2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 |
1 1/8 1 5/8 2 3/16 2 11/16 3 3/16 3 11/16 4 3/16 4 11/16 5 1/4 5 3/4 6 1/4 6 3/4 7 1/4 7 3/4 8 5/16 8 13/16 9 5/16 9 13/16 10 5/16 |
1 1 1/2 2 2 1/2 3 3 1/2 4 4 1/2 5 5 1/2 6 6 1/2 7 7 1/2 8 8 1/2 9 9 1/2 10 |
0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90 1.00 1.10 1.20 1.30 1.40 1.50 1.60 1.70 1.80 1.90 2.00 |
0.250 0.375 0.500 0.625 0.750 0.875 1.000 1.125 1.250 1.375 1.500 1.625 1.750 1.875 2.000 2.125 2.250 2.375 2.500 |
0.600 0.600 0.600 0.600 0.600 0.600 0.600 0.600 0.600 0.600 0.600 0.600 0.600 0.600 0.600 0.600 0.600 0.600 0.600 |
American National Standard Taper Shanks
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No. of Taper |
Taper per Foot |
Dia. at Gage Line | Tolerances for Diameter A |
Dia. at A' |
Length to L |
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| Class X Gage | Class Y Gage | Class Z Gage | |||||||
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5 10 15 20 25 30 35 40 45 50 55 60 |
3.500 3.500 3.500 3.500 3.500 3.500 3.500 3.500 3.500 3.500 3.500 3.500 |
0.500 0.625 0.750 0.875 1.000 1.250 1.500 1.750 2.250 2.750 3.500 4.250 |
0.00004 0.00004 0.00004 0.00006 0.00006 0.00006 0.00006 0.00008 0.00008 0.00010 0.00010 0.00010 |
0.00007 0.00007 0.00007 0.00009 0.00009 0.00009 0.00009 0.00012 0.00012 0.00015 0.00015 0.00015 |
0.00010 0.00010 0.00010 0.00012 0.00012 0.00012 0.00012 0.00016 0.00016 0.00020 0.00020 0.00020 |
0.2995 0.3698 0.4401 0.4922 0.5443 0.7031 0.8438 1.0026 1.2839 1.5833 1.9870 2.3906 |
0.6875 0.8750 1.0625 1.3125 1.5625 1.8750 2.2500 2.5625 3.3125 4.0000 5.1875 6.3750 |
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