1519 R max. ± 0.001 R max. corresponds to Ra-Value Roughness parameters 71 – 100 100 17 – 26 N11 50 – 71 71 12 – 18 40 – 50 50 9 – 13 N10 31.5 – 40 40 6.3 – 10 25 – 31.5 31.5 5.2 – 7.6 N9 18 – 25 25 3.5 – 6 12.5 – 18 18 2.5 – 4 N8 8 – 12.5 12.5 1.5 – 2.8 5 – 8 8 0.8 – 1.8 N7 2.5 – 5 5 0.4 – 1 N6 1.4 – 2.5 2.5 0.2 – 0.47 N5 0.14 – 1.4 1.4 0.025 – 0.25 N1-N4 Nom. range of dia. Z Graduation Unequal graduation Unequal graduation and extreme unequal graduation. 0.5 - 1.9 3 120°/120°/120 1.9 - 2.65 4 93°/87° 2.65 - 13.2 6 63°/60°/57° 13.2 - 20.3 8 47°/43°/47°/43° Material to 6 mm to 10 mm to 16 mm to 25 mm over 25 mm Nom. range of dia. Z Graduation Extreme unequal graduation Extremely unequal graduation make it possible to make boreholes of high circularity precision with a maximum circuarity devitation of 1-3 µm and an ISO fitting exactness of almost IT 0.5. 3.0 - 20.0 6 75°/60°/45° Steel ≤ 800 0.1 - 0.2 0.2 0.2 - 0.3 0.3 - 0.4 0.4 - 0.5 Steel casting 0.1 - 0.2 0.2 0.2 0.2 - 0.3 0.3 - 0.4 Cast iron 0.1 - 0.2 0.2 0.2 - 0.3 0.3 - 0.4 0.4 - 0.5 Mailable cast iron 0.1 - 0.2 0.2 0.3 0.4 0.5 Copper 0.1 - 0.2 0.2 - 0.3 0.3 - 0.4 0.4 - 0.5 0.5 Brass, bronze 0.1 - 0.2 0.2 0.2 - 0.3 0.3 0.3 - 0.4 Aluminium 0.1 - 0.2 0.2- 0.3 0.3 - 0.4 0.4 - 0.5 0.5 Hard plastic 0.1 - 0.2 0.3 0.4 0.4 - 0.5 0.5 Thermoplastic 0.1 - 0.2 0.2 0.2 0.3 0.3 - 0.4 Roughness depth according to DIN Uneven spacing and extremely uneven spacing for Karnasch reamers Recommended drill hole diameters for reaming. Standard value in mm 11 Index 10 9 OIL 8 7 6 5 4 3 2 1
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