Reiff & Nestor Company
Quality Taps Since 1912
Distributor Sign In
Home
Products
All Taps
In Stock Special H-Limit Taps
In Stock Treated Taps
Overstocks & Deals
Special Taps
Catalog
Search
Find A Distributor
About R&N
Technical Information
Contact Us
Metric Tap Drill Sizes and Percentages of Threads
TAP SIZE
TAP DRILL
DECIMAL EQUIV.
THEOR. % OF THREAD
TAP SIZE
TAP DRILL
DECIMAL EQUIV.
THEOR. % OF THREAD
TAP SIZE
TAP DRILL
DECIMAL EQUIV.
THEOR. % OF THREAD
M1.6X3.5
1.25mm
0.0492
77
M8X1.25
I
0.272
67
M22X1.5
20.5mm
0.8071
77
1.3mm
0.0512
66
M8X1
7mm
0.2756
77
13/16
0.8125
70
#55
0.052
61
J
0.277
74
M24X3
21mm
0.8268
77
M1.8X.35
1.45mm
0.0571
77
M10X1.5
8.5mm
0.3346
77
27/32
0.8438
66
1.5mm
0.0591
66
R
0.339
71
M24X2
22mm
0.8661
77
#53
0.0595
64
M10X1.25
8.75mm
0.3445
77
7/8
0.875
68
M2X.4
1.6mm
0.063
77
S
0.348
71
M27X3
24mm
0.9449
77
#52
0.0635
74
M12X1.75
13/32
0.4062
74
61/64
0.9531
72
M2.2X.45
1.75mm
0.0689
77
Z
0.413
66
M27X2
25mm
0.9843
77
#50
0.07
72
M12X1.25
27/64
0.4219
79
63/64
0.9844
77
M2.5X.45
2.05mm
0.0807
77
11mm
0.4331
62
M30X3.5
26.5mm
1.0433
77
#45
0.082
71
M14X2
12mm
0.4724
77
1 1/16
1.0625
66
M3X.5
2.5mm
0.0984
77
31/64
0.4844
65
M30X2
28mm
1.1024
77
#39
0.0995
73
M14X1.5
12.5mm
0.4921
77
1 7/64
1.1094
70
M3.5X.6
2.9mm
0.1142
77
1/2
0.5
67
M33X3.5
29.5mm
1.1614
77
#32
0.116
71
M16X2
14mm
0.5512
77
1 11/64
1.1719
71
M4X.7
3.3mm
0.1299
77
9/16
0.5625
66
M33X2
31mm
1.2205
77
3.4mm
0.1339
66
M16X1.5
14.5mm
0.5709
77
1 15/64
1.2344
63
#29
0.136
60
37/64
0.5781
68
M36X4
32mm
1.2598
77
M4.5X.75
3.75mm
0.1476
77
M18X2.5
15.5mm
0.6102
77
1 17/64
1.2656
74
#25
0.1495
72
5/8
0.625
65
M36X3
1 19/64
1.2969
78
M5X.8
4.2mm
0.1654
77
M18X1.5
16.5mm
0.6496
77
33mm
1.2992
77
#18
0.1695
67
21/32
0.6562
68
1 5/16
1.3125
68
M6X1
5mm
0.1969
77
M20X2.5
17.5mm
0.689
77
M39X4
1 3/8
1.375
78
#8
0.199
73
45/64
0.7031
66
35mm
1.378
77
M7X1
6mm
0.2362
77
M20X1.5
18.5mm
0.7283
77
1 25/64
1.3906
71
B
0.238
74
47/64
0.7344
69
M39X3
36mm
1.4173
77
M8X1.25
6.75mm
0.2657
77
M22X2.5
19.5mm
0.7677
77
1 27/64
1.4219
74
6.8mm
0.2677
74
25/32
0.7812
66