axolotl wrote:
On 7/9/2010 12:19 PM, RBnDFW wrote:
I have a nice set of small collets that I cannot match up on any of the
collet charts. Looks like a miniature R8.

Here's the specs

3.00" OA Length
.500"bearing/shaft diameter
.675 max diameter at face.
5/16-16 internal thread.
sizes 1/6 - 3/8


B3. Used on the Bridgeport "C" head, and some of the "M" heads.

The chart I have shows the back bearing to be .650" on the B3.
Mine are .500". Thread size is also different.