Page 21 - Centerdrill Produktkatalog 2020 English
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M8 - 7.4 Surface without collar
Centerdrill 7.4 long Centerdrill 7.4 short-flat Centerdrill 7.4 long-flat
Order no.: 3650740 Order no.: 3550740
Product discription: 7.4 short-flat Product discription: 7.4 long-flat
Thread type: DIN ISO 13 / DIN 371 Thread type: DIN ISO 13 / DIN 371
Thread size: M8x1,25 Thread size: M8x1,25
Centerdrill core hole: 7,4mm Centerdrill core hole: 7,4mm
Working part L1: 14,0mm Working part L1: 18,20mm
Shank-ø: 8,0mm h6 Shank-ø: 8,0mm h6
Surface workpiece: flat / plan, without collar Surface workpiece: flat / plan, without collar
Max. Material thickness: 2,0mm Max. Material thickness: 4,5mm
Suitable for materials: Stainless steel Suitable for materials: Stainless steel
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Reference values for M8 in 1-2mm Material thickness
Material
Process data Stainless steel Steel Copper Brass Aluminum
RPM Centerdrill 1800 2100 3200 3200 3200
RPM Centertap 190-240 600-650 650-800 650-800 650-800
kW-Power + 2,0 1,5 1,5 1,5 1,5
Feed rate (mm/min)* + 50-150 50-150 50-150 50-150 50-150
• *While removing the collar, the feed rate should be increased at the end of the process, approx. 900 mm/min.
• These are recommended values and they may vary significantly, depending on the type of material, material
thickness, lubrication, etc. For thread forming, we recommend our cutting oil. If you use an emulsion, it should contain
at least 8-10% grease.
• CNC-data can be provided on request.
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