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1 - Komet Scandinavia AB

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JEL®<br />

Torque calculations for tapping and thread forming<br />

M<br />

k c<br />

h<br />

D<br />

M =<br />

Nm<br />

N/mm²<br />

mm<br />

mm<br />

Factor*<br />

8000<br />

Formula symbols and abbreviations used<br />

Torque<br />

Specific cutting force<br />

Thread pitch<br />

Nominal thread diameter<br />

× kc × h² × D<br />

1<br />

2<br />

Factor*<br />

Tapping<br />

Thread forming<br />

3<br />

New tool<br />

Used tool<br />

1,0 2,5<br />

2,5 3,5<br />

Specific cutting force kc<br />

Material<br />

Steel 1000-1300 N/mm²<br />

Steel 800-1000 N/mm²<br />

Steel 600- 850 N/mm²<br />

Steel

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