One for all: a single tap solution for multiple applications

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Selecting the correct drill size is paramount

It is very important to understand that the tap drill needs to create the minor internal thread diameter. Therefore the drill diameter should be in a range of maximum minor diameter of the internal thread to be produced.

The precise formula for the metric cutting tap drill size is:

S- the size of the tap drill (mm)

D- the basic major diameter of the thread (mm)

%- percentage of thread engagement

P- pitch of the thread (mm)

S= D – ([% X P] ÷ 76.98)

For example, the drill size needed for M8X1.25 with 75% of full thread: 8 – ([75X1.25]÷76.98)=6.78mm

The precise formula for the metric forming tap drill size is:

S- the size of the tap drill (mm)

D- the basic major diameter of the thread (mm)

%- percentage of thread engagement

P- pitch of the thread (mm)

S= D – ([% X P] ÷ 147.06)

For example, the drill size needed for M8X1.25 with 70% of full thread: 8 – ([70X1.25]÷147.06)=7.4mm

Iscar said its drills are suited for standard coarse pitch thread tolerances. Solid carbide drills are made with m7 tolerance and indexable head drills are produced with k7 tolerance. The hole tolerance produced by these drills is 0/+0.05 mm. This will ensure the correct pre-threading hole diameter.

It is always preferable to produce a chamfer on the hole before the threading operation. The company offers drills that combine the drilling and chamfering operation into a single machining cycle.

One system allows adjustment of the drill projection for proper drilling depth according to thread specification. The other provides drilling heads that enable an easy swap from different material types to be machined, which makes it very user-friendly and saves time.

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One for all: a single tap solution for multiple applications

Selecting the correct drill size is paramount