Lathe Chuck Back Plate 6 3/4" OD with 2 3/8" - 6 TPI Hub

Description

Lathe Chuck Back Plate 6 3/4" OD with 2 3/8" - 6 TPI Hub. Condition is Used. Shipped with USPS to the lower 48 contiguous United States ONLY.
The thread pitch was found to be 6 TPI using a thread gauge.  The thread OD was determined by measurement of the thread ID (2.194" average of 6 values). This value was then compared with those tabulated in Machinery's Handbook 23rd Edition page 1481.  It was found to lie within the limits given for the 2 3/8"-6 TPI entry.
Other pertinent dimensions:
Hub depth = 1 3/4"
Hub Backside Protrusion - 1/4"
Flange thickness = 7/16"
Bolt Circle Diameter = 5 3/8" with 5/8" diameter holes at 90 degree intervals.