Do you already know the impressive tool life of VÖLKEL GREEN RING Machine Taps?

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10.000 pcs of tapped holes and the VÖLKEL GREEN RING Machine Tap is still in use

without any visible wear. The Customer is fascinated and satisfied with this great result.


Workpiece: Automotive part (Steering knuckle)

Material: GGG40

Rotation speed: 550-600 RPM

Pre-hole diameter: 5,0 mm with extra chamfered edge at entry position

Lubricant: Emulsion (mixed of water-oil)

Length of thread: 8mm

Type of hole: Blind hole

Machining direction: Horizontal


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