1/2" UNF HSS L/H Taper Tap

For producing precision Left Hand threads by hand tapping, for starting threads - either second or bottoming taps should used after to achieve desire thread depth.
General purpose use
Suitable for materials up to 1000N/mm2
Through & blind holes
Suitable for both hand and machine operations
Threads per inch 20
Overall length 89mm
Cutting length 29mm
Drill diameter 11.5mm