1. The major diameter of the Chamfer is read directly on the dial or electronic indicator

2. A Chamfer gage is a measurement tool that measures the major diameter of Chamfers, tapered holes and countersinks

3. The Barcor Chamfer Gage is a precision instrument designed specifically to measure the top (major) diameter of a Chamfer, countersink or tapered hole

4. THREAD DATA CHART: Metric Thread -- Coarse Pitch: Nominal Size ISO M: Thread Form Type: Major Diameter mm d=D: Pitch mm p: Root Radius mm r: Pitch Diameter mm d2=D2: Minor Diameter Male Thd

5. Since threading often produces starting burrs, these can be minimized by specifying a 45° countersink or Chamfer which is .015" minimum larger than the major diameter on internal threads (see Figure 4) and .015" minimum smaller than the minor diameter on external threads (see Figure 3).