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Hard Drill, Type B781

®

Solid-carbide Drills for Drilling Hard Materials

Shank typestraight,Version A: t l l
max 4 5 d d l
1 1 2 Forthreadt KC Ø d
1 6215
max d
2 h6 l
1 l
4 l
5 t
max / d
1 3
m7 B781A03000
+0,05 M4 B781A03400

•

7,5363471,502,53,40 B781A04000

•

8,0463491,602,54
+0,05 M5 B781A04300

•

10,0463442,002,54,3 M6 B781A05000

•

10,3563432,052,55
m7 B781A06000

•

12,5563402,502,56
m7 +0,05 M8 B781A06850

•

15,0663403,002,56,85 B781A08000

•

17,3763383,452,58
m7 +0,05 M10 B781A08500

•

20,0876444,002,58,5 B781A10000

•

21,81076434,352,510
m7 +0,05 M12 B781A10300

•

25,01089525,002,510,3 B781A12000

•

26,01189525,702,512
m7 B781A14000

•

30,012100556,002,514
m7 B781A16000

•

35,014100487,002,516
m7 B781A18000

•

40,016110508,002,518
m7 B781A20000

•

45,018125589,002,520
m7

•

50,0201255110,002,5

The drilling mills B781 were developed forhard materials HRC 62.In addition to drilling they can also be used for3-D milling. Drilling Standard values

Feed per tooth [mm]

c in[m/min] up to Diameter in mm 34568101214161820<30800,100,120,140,160,180,200,220,250,270,280,3030-40600,080,100,130,150,170,190,200,230,250,260,28 40-50450,070,090,100,120,160,180,190,200,220,230,25 50 - 60400,060,080,090,100,140,170,180,190,200,210,22 60 - 70300,050,060,070,080,100,120,140,160,170,180,19

B

Note:

34

Maximum drilling depth: 2,5 x D.SteelRockwellhardness HRcCuttingspeed v