Bore Gage Setting Ring Set * (6) sizes between 3.7" and 4.8"
Sizes included:
3.7012"
3.8114"
4.503"
4.6336"
4.7024"
4.7615"
I don't see any sign that these were calibrated in the past They all seem to be inscribed with a tool number (that includes the diameter).
All the rings are knurled on the OD and the IDs appear to be sufficiently smooth.
The rings are marked with dimensions that are accurate between the 2 arrows marked on each ring.
When I checked them with my ID micrometer (not calibrated), they all seemed to read .0005 to .001 under the size marked.
Like I said, the micrometer hasn't been calibrated. And setup / technique were also a possible points of error.
Good condition! From an inspection department of a quality, nationally known & respected machine tool accessory manufacturer. The company decided to close one of its facilities. See images.
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