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12. Guide to Threads Forming Taps (Roll Taps)

<Condition of use>

Relation between tapping speed and tapping lubricant depending on work materials.

Work MaterialTapping SpeedTapping lubricant
Ali d Ali AllDie Cast MaterialsInsoluble oil
umnum an umnum oyCold Drawn, Cold Forged, Cast
Die Cast Materials
Zinc and Zinc AlloyCold Drawn, Cold Forged, Cast
CopperCold Forged, Cast
BrassCold Drawn, Cold Forged
lMild Steel, Medium Carbon Steel, Stainless Steel
SteeFree Cutting Steel, Soft Magnetic Iron

Note : It is necessary to carefully select a suitable tapping speed taking into consideration : machining conditions, style of tap, number of tap chamfered threads, work piece design, material being tapped, hole condition and type of tapping fluid.

Accuracy of roll taps

■Comparison of pitch diameter tolerance zone between ISO6H internal threads and recommended Roll Taps

Sizes Basic Pitch Dia. (+)μm

M 1.40.3ISO 2XISO 3X
M 1.60.35ISO 2XISO 3XTap class for 6H ISO2X
M 1.80.35ISO 2XISO 3XTap class for 6G ISO3X
M 20.4ISO 2XISO 3XInternal threads 6H
M 2.20.45ISO 2XISO 3X
M 2.50.45ISO 2XISO 3X
M 30.5ISO 2X ISO 3X
M 3.50.6ISO 2XISO 3X
M 40.7ISO 2XISO 3X
M 50.8ISO 2XISO 3X
M 61ISO 2XISO 3X
M 81.25ISO 2X ISO 3X
M 101.5ISO 2XISO 3X
M 121.75ISO 2X ISO 3X

■Roll taps for miniature threads, Accuracy GS class

GS class is the accuracy class special for roll taps for miniature threads. ■Comparison table of PD tolerance of GS class of roll taps for miniature threads and 4H5 internal threads. 8 18 GS1 23 GS2 28

13GS333
18GS4
23

10 20 30 40 45

S0.6×0.15 GS2 4H5 internal threads S0.7×0.175 GS3

S0.8×0.2 GS class tap GS3 S0.9×0.225 GS4

Basic pitch diameter Tolerance area

(+)μm