Headed Drill Bush-standard: DIN 172 similar to ISO 4247

d1
short
medium
long
d2
d3
L2
r
tr
tp
Above 0.4 to 0.8
graded bores d1 (15 in increments of 0.1 & 0.25 mm ) 15 preferably 0.5 mm
6
3
6
2
1
0.01
0.03
Above 0.8 to 1.0
6
9
3
6
Above 1.0 to 1.8 
4
7
Above 1.8 to 2.6
5
8
Above 2.6 to 3.3
8
12
16
6
9
2.5
1
 
Above 3.3 to 4.0
7
10
Above 4.0 to 5.0
8
11
Above 5.0 to 6.0
10
16
20
10
13
3
1.5
0.02
Above 6.0 to 8.0
12
15
Above 8.0 to 10.0
12
20
25
15
18
2
Above 10.0 to 12.0
18
22
4
2
Above 12.0 to 15.0
16
28
36
22
26
Above 15.0 to 18.0
26
30
Above 18.0 to 22.0
20
36
45
30
34
5
3
Above 22.0 to 26.0
35
39
0.05
Above 26.0 to 30.0
25
45
56
42
46
Above 30.0 to 35.0
48
52
5
3
0.04
Above 35.0 to 42.0
30
56
67
55
59
3.5
Above 42.0 to 48.0
62
66
6
Above 48.0 to 55.0
70
74
Above 55.0 to 63.0
35
67
78
78
82
4
   
.Material: Steel selected by manufacturer

Hardness: 740+80 HV10

How to order: Headed drill bush DIN 172 d1*l1