Thread Pitch Gauge Set Included Threads per Inch 2 1/4 TPI 2 3/8 TPI 2 1/2 TPI 2 5/8 TPI 2 3/4 TPI 2 7/8 TPI 3 TPI 3 1/4 TPI 3 1/2 TPI 4 TPI 4 1/2 TPI 5 TPI 5 1/2 TPI 6 TPI 7 TPI 8 TPI 9 TPI 10 TPI 11 TPI 12 TPI 13 TPI 14 TPI 16 TPI 18 TPI 20 TPI 24 TPI 28 TPI Maximum Thread Pitch - mm 28 Minimum Thread Pitch - mm 2 1/4 Number of Leaves 27 Thread Angle 60 Degrees Thread Type Metric Gauge Material Steel Locking Device Yes Thread Location Internal/External