Set 3 HSS Metric Serial Tap Set M3 M4 M5 M6 M8 M10 M12 Right Hand Thread Cutter Machine Taps
Serial Tap Set(Rougher, Intermediate and Finisher)
Serial Tap Set (Designated as Rougher, Intermediate and Finisher) actually vary in thread diameter, unusual conventional tap sets (Taper, Second and Plug) where the difference between each one is length of the taper.
For extremely smooth thread tapping
Bacause the major and pitch diameter of the "rougher" is smaller than the "Intermediate", and "Intermediate" is smaller than the "Finisher" each tap removes a smaller volume of metal resulting in a extremely smooth thread.
Serial taps come in sets of three. The first two taps cut under size and the third completes the threading.
Tapping takes less effort because the full thread is cut in 3 passes.
Reduced tap breakage due to reduced load.
Easier to start straight because the roughing tap is a lot smaller, as well as tapered.
How to use it?
To start cutting inside threads lube your hole with cutting oil and start the Rougher tap with lots of taper run this tap about 2 or 3 turns in then back it out 1/4 turn lube your work go another 2 or 3 turns back it out 1/4 turn keeping your work wet with cutting fluid continue this method until you have completed the cut then use Intermediate tap the tap with the 2nd least amount of taper run this tap through using the same method as above then your final cut is with the Finisher tap.
Specification:
Size:as the picture show
Material:High Speed Steel
Package include:
1 x Rougher tap
1 x Intermediate tap
1 x Finisher tap
Care in tapping:
Considerable care must be execised when tapping.
Use the tap before the die because the tap are non-adjustdable for size, the dies are.
Start the tap square.
Use a cutting solution where necessary.