Centre Gauge Fish Tail Screw Thread Pitch Cutting Gauge 55 or 60 Degree

Center gauges are gauges used in lathe work for checking the angles when grinding the profiles of single-point screw-cutting tool bits and centers.  

These gauges are most commonly used when hand-grinding threading tool bits on a bench grinder, although they may be used with tool and cutter grinders.

 Very Handy Gauge For Grinding & Setting Thread Cutting Tools.

• Permanently etched graduations.

• Edge profile ground.

• Useful to find number of threads per inch by means of graduations in  14ths, 24ths and 32nds of an inch.
Three options:
1. WhitWorth or English Standard angle 55°
2. ISO standard 60°
3. USA standard 60°