Application

The Combined Tap enables the user to produce the tapping drill hole and the through thread in one operation without any tool changing. The tool incorporates a twist drill before the thread tapping part. This tool can produce through threads up to a maximuthreaded depth of 2 x D. The Combined Tap is suitable for universal use in materials of mediumechanical strength: non-alloyed and alloyed steel sorts up to 600 N/mm², malleable cast iron, nodulized graphite cast iron, copper, brass, aluminium, aluminium-magnesiuand zinc alloys, red bronze, electron metal, pressure-cast zinc. This tool should be used on machines possesing an RPswitchover facility for drilling and tapping. The feed rate must be adapted to the particular operation required - drilling or tapping. Tapping chucks with pressure compensation may not be used.

Additional information
Type of thread Whitworth-Thread
Standard Works Standard
Material HSSE
Tolerance medium
Size BSW 1/4 x 20
Overall length (L1) 80 mm
Thread length (L2) 22 mm
Core hole diameter (D1) 5.1 mm
Shank diameter (D2) 6.0 mm
Length (S1) 22 mm
Drive connector 4.9 mm
EAN 4022835700142
Item number 70014
Type of flute 30° Spiral Flute
Application for through holes
Thread standard BS 84
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