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Drills
(60o Combined Drills and Countersinks)

Standard No: GB6078
Material: H.S.S
Metric System:mm
Index
  1. (A) Plain type (metric system)
  2. (A) Plain type (british system)
  3. (B) Bill type (metric system)
  4. (B) Bill type (british system)

(A) Plain type (metric system)
d
d1
L
l
1.0
3.15
31.5
1.9
1.25
3.15
35.5
2.8
1.6
4
35.5
2.8
2.0
5
40
3.3
2.5
6.3
45
4.1
3.15
8
50
4.9
4.0
10
56
6.2
5.0
12.5
63
7.5
6.3
16
71
9.2
8.0
20
80
11.5
10.0
25
100
14.2

(B) Bill type (metric system)
d
d1
d2
L
l
1.0
4
2.12
35.5
1.9
1.25
5
2.65
40
2.2
1.6
6.3
3.55
45
2.8
2.0
8
4.25
50
3.3
2.5
10
5.3
56
4.1
3.15
11.2
6.7
60
4.9
4.0
14
8.5
67
6.2
5.0
18
10.6
75
7.5
6.3
20
13.2
80
9.2
8.0
25
17
100
11.5
10.0
31.5
21.2
125
14.2

(A) Plain type (british system)
size
designation
d1
d
i
l
inch
mm
inch
mm
inch
mm
inch
mm
00
1/8
3.18
0.025
0.64
0.030
0.76
1-1/8
29
0
1/8
3.18
1/32
0.79
0.038
0.79
1-1/8
29
1
1/8
3.18
3/64
1.19
3/64
1.19
1-1/4
32
2
3/16
4.76
5/64
1.98
5/64
1.98
1-7/8
48
3
1/4
6.35
7/64
2.78
7/64
2.78
2"
51
4
5/16
7.94
1/8
3.18
1/8
3.18
2-1/8
54
5
7/16
11.11
3/16
4.76
3/16
4.76
2-3/4
70
6
1/2
12.70
7/32
5.56
7/32
5.56
3"
76
7
5/8
15.88
1/4
6.35
1/4
6.35
3-1/4
83
8
3/4
19.05
5/16
7.94
5/16
7.94
3-1/2
89

(B) Bill type (british system)
size designation
d1
d
d2
i
l
inch
mm
inch
mm
inch
mm
inch
mm
inch
mm
11
1/8
3.18
3/64
1.19
0.10
2.5
3/64
1.19
1-1/4
32
12
3/16
4.76
1/16
1.59
0.15
3.8
1/16
1.59
1-7/8
48
13
1/4
6.35
3/32
2.38
0.20
5.1
3/32
2.38
2"
51
14
5/16
7.94
7/64
2.78
0.25
6.4
7/64
2.78
2-1/8
54
15
7/16
11.11
5/32
3.97
0.35
8.1
5/32
3.97
2-3/4
70
16
1/2
12.70
3/16
4.76
0.40
10.2
3/16
4.76
3"
76
17
5/8
15.88
7/32
5.56
0.50
12.7
7/32
5.56
3-1/4
83
18
3/4
19.05
1/4
6.35
0.60
15.2
1/4
6.35
3-1/2
89




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