Tapping Services tailored to your product's exact requirements.
Whether it be internal holes or external threads, Zinc alloys are readily tapped and form excellent quality threads. Threads can be cut or formed with and without lubricants and can be easily tapped using fluteless taps to produce a rolled thread. Fluteless tapping is carried out at higher speeds than cutting taps, and lubrication is essential.
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Form tapping can be performed on the zinc alloys over a wide range of conditions. Form taps are fluteless and much stronger than fluted cutting taps, making them especially useful for small diameter holes where tap breakage is a potential problem. Form tapping also eliminates congestion of the small flutes. Form taps are more expensive, give poorer thread shape and require more accurate hole diameters than cut thread taps but they do have the considerable advantage of producing no swarf and the strength of the thread produced is equal if not better than a cut thread, (except in respect of torque relaxation). The recommended tapping speeds for form tapping are the same as for cut threads. Cutting fluids are especially important because the process generates high frictional forces. Water-based oils or light mineral oils are suitable.
In most cases, tapping is performed on cored holes in the diecasting without any drilling operation. If this is not possible holes can be drilled prior to tapping. Please see our drilling section for more information.