Roltappen

When fluteless taps are used, the material to be threaded is not cut into. Rather, the material is transformed. This way, no chips are produced. Because transforming takes place instead of cutting, fluteless taps cannot be used in all sectors; the end shape or open thread top is not always needed. The screw thread formed can be produced more quickly and is stronger than a cut screw thread.

Steel/ Alu Threadformer

Contains 4 product(s)

UNI Threadformer

Contains 2 product(s)

Roltappen

Pre-drill diameter with fluteless taps

Because the material is pushed up when fluteless taps are used, the pre-drill diameters are larger than when hand taps and machine taps are used. The tolerance of the pre-drill diameter is smaller, too. This means it is important to use the right diameter for pre-drilling when using fluteless taps to ensure that the workpiece is not ruined during the final machining operation. See our summary of pre-drill diameters for fluteless taps. The fluteless taps are available in sizes M2 to M20, with M4, M5, M6 and M8 being the most popular. An added advantage of the fluteless tap is that only 1 fluteless tap is required to thread both blind and continuous holes.

Fluteless tap and material to be machined

The fluteless tap can, in principle, be used on materials with a 10% minimum stretch, including most steel types up to 1000N/mm2, stainless steel, aluminium and nodular cast irons. Other materials lend themselves better to being cut. The UNI fluteless tap can be used on the most commonly used materials; for steel and aluminium, there is a specific fluteless tap in the range.

Discover our full range of fluteless taps.