SL WN VHM FIRE twist drill, internal cooling, shaft HA 7xD 4.90mmGÜHRING

Twist drill, solid carbide, SuperLine

Design: right-hand cut, with special grinding.Normal side rake angle, core thickness greater than normal, no taper.Drill with very good self-centering properties, producing short chips even when cutting long-chipping materials.
Application Twist drill for concentricity with narrow diameter tolerances and good surface quality.Designed to drill up to 7 x D holes at high cutting speeds.Particularly suitable for long and short-cut materials, such as construction and carburizing steels, cast steel, heat-treatable steels, carbon steels, bronzes, castings, high-alloy AlSi alloys and alloy steels with a strength of up to 1200 N / mm2.

Spiral grooves supplying coolant.The coolant goes directly to the blades and flushes the chips away from the drill hole.

Technical parameters:

• Ø m7 / h7: 4.90 mm
• Spiral length l2: 50.0 mm
• Shank length l3: 36 mm
• Overall length l1: 90 mm
• Shank Ø h6: 6 mm
• Steel & lt; 1000 N / mm2 f: 0.125 mm / rev.
• Steel & lt; 700 N / mm2: 130
• Steel & lt; 1000 N / mm2: 120
• Steel & lt; 1400 N / mm2: 105
• INOX ferrite./ martenz .: 60
• INOX austenit .: 55
• INOX duplex: 45
• Cast iron GG / GTS: 180
• Cast iron GGG : 144
• Tytan & gt; 850 N / mm2: 40
• Aluminum & lt; 8% silicon: 260
• Aluminum & gt; 8% silicon: 220
• Copper alloys: 325
• Hardened steel & lt; 55 HRC: 55
• HGNr .: W112