Tools > Drilling > Countersink Bits & Sets | Sutton Tools 90 Three Flute Countersink Drill Bits DIN | Descriptions | Three Flute Countersink 90, DIN 335, UNI | Countersinking / Counterboring screw holes | For Countersunk screws acc. to DIN 963, 964, 965, 966, 7513, 7516 | For Countersunk screws acc. to ISO 2009, 2010, 7046-1, 7046-2, 7047 | Chamfering of tapping holes | Dimensions | d1 (mm): 31 | d2 (mm): 12 | l1 (mm): 71 | Screw Head (mm): M10 | Pack Quantity: 1 | Features | For use in machine applications | Type N - For non-ferrous, Type UNI - For difficult to machine materials | Specifications | Designation: UNI | Material: High Speed Steel-Cobalt | Finish: TiAIN | Shank Tolerance: h9 | Standard: DIN 335 | Point Type: 90 | Applications | Optimal for Steel - Non-alloy, cast & free cutting (~ 0.15 %C)- 125 HB | Optimal for Steel - Non-alloy, cast & free cutting (~ 0.45 %C)- 190 HB | Optimal for Steel - Non-alloy, cast & free cutting (~ 0.45 %C)- 250 HB | Optimal for Steel - Non-alloy, cast & free cutting (~ 0.75 %C)- 270 HB | Optimal for Steel - Non-alloy, cast & free cutting (~ 0.75 %C)- 300 HB | Optimal for Steel - Low alloy & cast < 5% of alloying elements- 180 HB | Optimal for Steel - Low alloy & cast < 5% of alloying elements- 275 HB | Optimal for Steel - Low alloy & cast < 5% of alloying elements- 300 HB | Optimal for Steel - High alloy, cast & tool- 200 HB | Optimal for Steel - Corrosion resistant & cast - Ferritic / Martensitic- 200 HB | Optimal for Steel - Corrosion resistant & cast Martensitic- 240 HB | Optimal for Stainless Steel Austenitic- 180 HB | Optimal for Stainless Steel Duplex- 250 HB | Optimal for Stainless Steel - Precipitation Hardening- 250 HB | Optimal for Cast Iron, Grey (GG) - Ferritic / Pearlitic- 180 HB | Optimal for Cast Iron, Grey (GG) - Pearlitic- 260 HB | Optimal for Cast Iron, Nodular (GGG) - Ferritic- 160 HB | Optimal for Cast Iron, Nodular (GGG) Pearlitic- 250 HB | Optimal for Cast Iron, Malleable Ferritic- 130 HB | Optimal for Cast Iron, Malleable Pearlitic- 230 HB | Optimal for Aluminum & Magnesium, cast alloy 12% Si - Non Heat Treatable- 75 HB | Optimal for Aluminum & Magnesium, cast alloy 12% Si - Heat Treatable- 90 HB | Optimal for Aluminum & Magnesium, cast alloy >12% Si - Non Heat Treatable- 130 HB | Optimal for Copper & Copper alloys (Brass/Bronze) - Free cutting, Pb > 1 110 HB | Optimal for Copper & Copper alloys (Brass/Bronze) - Brass (CuZn, CuSnZn)- 90 HB | Optimal for Copper & Copper alloys (Brass/Bronze) - Bronze (CuSn)- 100 HB | Optimal for Cast Iron Chilled 400 HB