Sutton Tools Tapping Drill Size Chart
Threading Tapping Drill Size Chart
M ISO METRIC COARSE (60?)
Tap Size
M1.6 M2 M2.5 M3 M3.5 M4 M4.5 M5 M6 M8 M10 M12 M14 M16 M18 M20 M22 M24 M27 M30 M33 M36 M42 M45 M48 M52 M56
Pitch mm
0.35 0.4 0.45 0.5 0.6 0.7 0.75 0.8 1.0 1.25 1.5 1.75 2.0 2.0 2.5 2.5 2.5 3.0 3.0 3.5 3.5 4.0 4.5 4.5 5.0 5.0 5.5
Tapping Drill mm
1.25 1.6 2.05 2.5 2.9 3.3 3.7 4.2 5.0 6.8 8.5 10.2 12.0 14.0 15.5 17.5 19.5 21.0 24.0 26.5 29.5 32.0 37.5 40.5 43.0 47.0 50.5
MF ISO METRIC FINE (60?)
M4 M5 M6 M8 M10** M10 M12** M12 M14** M14 M16* M18** M20* M22 M24 M25* M32* M40* M50*
0.5
3.5
0.5
4.5
0.75
5.3
1.0
7.0
1.0
9.0
1.25
8.8
1.25
10.8
1.5
10.5
1.25
12.8
1.5
12.5
1.5
14.5
1.5
16.5
1.5
18.5
1.5
20.5
2.0
22.0
1.5
23.5
1.5
30.5
1.5
38.5
1.5
48.5
*Metric Conduit **Spark Plug
8UN (8 TPI) UNIFIED NATIONAL FORM (60?)
1-1/8 1-1/4 1-3/8 1-1/2 1-5/8 1-3/4 1-7/8 2
8
25.5
8
28.5
8
31.75
8
35.0
8
38.0
8
41.5
8
44.5
8
47.5
UNC UNIFIED NATIONAL COARSE (60?)
Tap Size
#2 (.086) #3 (.099) #4 (.112) #5 (.125) #6 (.138) #8 (.164) #10 (.190) #12 (.216) 1/4 5/16 3/8 7/16 1/2 9/16 5/8 3/4 7/8 1 1-1/8 1-1/4 1-3/8 1-1/2 1-3/4 2
TPI
Tapping Drill
mm
56
1.85
48
2.1
40
2.3
40
2.6
32
2.8
32
3.4
24
3.8
24
4.5
20
5.1
18
6.6
16
8.0
14
9.4
13
10.8
12
12.2
11
13.5
10
16.5
9
19.5
8
22.2
7
25.0
7
28.0
6
31.0
6
34.0
5
39.5
4.5
45.0
UNF UNIFIED NATIONAL FINE (60?)
#3 (.099)
56
#4 (.112)
48
#5 (.125)
44
#6 (.138)
40
#8 (.164)
36
#10 (.190)
32
#12 (.216)
28
3/16*
32
1/4
28
5/16
24
3/8
24
7/16
20
1/2
20
9/16
18
5/8
18
3/4
16
7/8
14
1
12
1*
14
1-1/8
12
1-1/4
12
1-3/8
12
1-1/2
12
2.1 2.35 2.65 2.9 3.5 4.1 4.6 4.0 5.5 6.9 8.5 9.8 11.5 12.8 14.5 17.5 20.5 23.5 24.0 26.5 29.5 33.01 36.0
*UNS
UNEF UNIFIED NATIONAL FORM (60?)
1/4 5/16 3/8 1/2 5/8
32
5.6
32
7.2
32
8.8
28
11.8
24
14.75
3/4
20
18
1
20
24.2
BSW BRITISH STANDARD WHITWORTH (55?)
Tap Size
1/16* 3/32* 1/8 5/32* 3/16 7/32* 1/4 5/16 3/8 7/16 1/2 9/16 5/8 3/4 7/8 1 1-1/8 1-1/4 1-1/2 1-3/4 2
TPI
60 48 40 32 24 24 20 18 16 14 12 12 11 10 9 8 7 7 6 5 4-1/2
Tapping Drill mm
1.2 1.85 2.55 3.2 3.7 4.5 5.1 6.5 7.9 9.3 10.5 12.1 13.5 16.25 19.25 22.0 24.75 28.0 33.5 39.0 44.5
*WHIT. Form
BSF BRITISH STANDARD FINE (55?)
3/16 7/32 1/4 5/16 3/8
32
4.0
28
4.6
26
5.3
22
6.8
20
8.3
7/16 1/2 9/16 5/8 11/16
18
9.8
16
11.0
16
12.7
14
14.0
14
15.5
3/4 7/8 1 1-1/8 1-1/4
12
16.75
11
19.75
10
22.75
9
25.5
9
28.5
1-1/2 1-3/4
8
34.5
7
41.0
BSB BRITISH STANDARD BRASS (55?)
1/4 5/16 3/8 7/16 1/2 9/16 5/8 3/4 7/8 1
26
5.2
26
6.8
26
8.4
26
10.0
26
11.6
26
13.2
26
14.8
26
18.0
26
20.8
26
24.3
*Taper pipe threads of improved quality are obtained when the tapping hole is pre-formed using Sutton Taper Pipe Reamers.
Threading Tapping Drill Size Chart
Rc (BSPT)* ISO Rc TAPER SERIES 1:16 (55?)
Tap Size
Rc 1/16 Rc 1/8 Rc 1/4 Rc 3/8 Rc 1/2 Rc 3/4 Rc 1 Rc 1-1/4 Rc 1-1/2 Rc 2
TPI Drill Drill & Only* Reamer
28
6.4
6.2
28
8.4
8.4
19
11.2 10.8
19 14.75 14.5
14 18.25 18.0
14 23.75 23.0
11
30.0 29.0
11
38.5 38.0
11
44.5 44.0
11
56.0 55.0
G (BSPF) ISO G PARALLEL SERIES (55?)
Tap Size
TPI
Tapping Drill
mm
G 1/16
28
6.8
G 1/8
28
8.8
G 1/4
19
11.8
G 3/8
19
15.3
G 1/2
14
19.0
G 5/8
14
21.0
G 3/4
14
24.5
G 7/8
14
28.5
G 1
11
31.0
G 1-1/4
11
39.5
G 1-1/2
11
45.5
G 1-3/4
11
51.5
G 2
11
57.5
G 2-1/2
11
72.5
Rp (BSPPL) SEALING PIPE THREAD PARALLEL (55?)
Rp 1/8 Rp 1/4
28
8.6
19
11.5
Rp 3/8
19
15.0
Rp 1/2
14
18.5
Rp 3/4
14
24.0
Rp 1
11
30.2
Rp 1-1/4
11
39.0
Rp 1-1/2
11
45.0
Rp 2
11
56.4
Pg (Steel Conduit) (80?)
Pg7
20
11.3
Pg9
18
13.9
Pg11
18
17.3
Pg13.5
18
19.1
Pg16
18
21.2
Pg21
15
26.8
THREAD FORMING (FLUTELESS TAPS)
Tap Size
Pitch mm
Tapping Drill mm
METRIC COARSE
M1 M1.1 M1.2 M1.4 M1.6 M1.7 M1.8 M2.0 M2.2 M2.3 M2.5 M2.6 M3 M3.5 M4 M5 M6 M8 M10 M12
0.25
0.9
0.25
1.0
0.25
1.1
0.3
1.28
0.35
1.45
0.35
1.55
0.35
1.65
0.40
1.8
0.45
2.0
0.4
2.1
0.45
2.3
0.45
2.4
0.5
2.8
0.6
3.2
0.7
3.7
0.8
4.6
1.0
5.5
1.25
7.4
1.5
9.3
1.75
11.2
BSW
1/8 5/32 3/16 1/4 5/16 3/8
40
2.9
32
3.6
24
4.3
20
5.8
18
7.3
16
8.8
NPT-NPTF* NATIONAL PIPE TAPER 1:16 (60?)
Tap Size
1/16 1/8 1/4 3/8 1/2 3/4 1 1-1/4 1-1/2 2
TPI
27 27 18 18 14 14 11-1/2 11-1/2 11-1/2 11-1/2
Drill Only*
6.3 8.5 11.0 14.5 18.0 23.0 29.0 37.5 44 55.5
Drill & Reamer
6.0 8.2 10.8 14.0 17.5 23.0 28.5 37.0 43.5 55.0
NPSF NATIONAL PIPE STRAIGHT (60?)
Tap Size
1/8 1/4 3/8 1/2
TPI
Tapping Drill
mm
27
8.6
18
11.3
18
14.5
14
18.0
THREAD FORMING (FLUTELESS TAPS)
Tap Size
T.P.I. Tapping Drill mm
UNC
#1 (.073)
64
1.7
#2 (.086)
56
2.0
#3 (.099)
48
2.3
#4 (.112)
40
2.6
#5 (.125)
40
2.9
#6 (.138)
32
3.2
#8 (.164)
32
3.8
#10 (.190)
24
4.4
#12 (.216)
24
5.0
1/4
20
5.8
5/16
18
7.3
3/8
16
8.8
7/16
14
10.2
1/2
13
11.7
UNF
#1 (.073)
72
1.7
#2 (.086)
64
2.0
#3 (.099)
56
2.3
#4 (.112)
48
2.6
#5 (.125)
44
2.9
#6 (.138)
40
3.2
#8 (.164)
36
3.9
#10 (.190)
32
4.5
#12 (.216)
28
5.1
1/4
28
6.0
5/16
24
7.5
3/8
24
9.0
7/16
20
10.6
1/2
20
12.1
G (BSPF)
1/8
28
9.25
1/4
19
12.5
3/8
19
16.0
1/2
14
20.0
5/8
14
22.0
3/4
14
25.5
7/8
14
29.25
1
11
32.0
BA BRITISH ASSOCIATION (47.5?)
Tap Size
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Pitch mm
1 0.9 0.81 0.73 0.66 0.59 0.53 0.48 0.43 0.39 0.35 0.31 0.28 0.25 0.23 0.21 0.19
Tapping Drill mm
5.1 4.5 4.0 3.4 3.0 2.65 2.3 2.05 1.8 1.55 1.4 1.2 1.05 0.98 0.8 0.7 0.6
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