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> [ = ] starrett no. C391 no. C398M center gauges [ = ]
[ = ] starrett no. C391 no. C398M center gauges [ = ]
| No. C391 - 60 American National |
| Made of spring-tempered steel with satin chrome finish. Gaging surfaces ground. |
| Very useful scale for finding the number of threads per inch through graduations in 14ths, 20ths, 24ths and 32nds of an inch on No. C391. |
| Graduations on No. C398M are in mm and 1/2mm. |
| The No. C391 Gage also has a table of double depths of threads for determining size of tap drills. |
![[ = ] starrett no. C391 no. C398M center gauges [ = ]](/Full-Machines/Incomplete-Machines/East/Used/starrett-no-C391-no-C398M-center-gauges-pic-no-.jpg)