Machinery's Handbook, 31st Edition
Taps
995
Table 15. Tap Thread Limits: Metric Sizes, Ground Thread (M Profile Standard Thread Limits in Inches) ANSI/ASME B94.9-2008 (R2018) Nom. Major Diameter (Inches) Pitch Diameter (Inches)
Limit #
D # Limit
Limit #
D # Limit
Dia mm
Pitch, mm
Basic
Min.
Max.
Basic
D
Min.
Max.
D
Min.
Max.
1.6 0.35 0.06299 0.06409 0.06508 0.05406 0.4 0.07874 0.08000 0.08098 0.06850 2.5 0.45 0.09843 0.09984 0.10083 0.08693 2 0.5 0.11811 0.11969 0.12067 0.10531 3.5 0.6 0.13780 0.13969 0.14067 0.12244 0.7 0.15748 0.15969 0.16130 0.13957 4.5 0.75 0.17717 0.17953 0.18114 0.15799 3 4 0.8 0.19685 0.19937 0.20098 0.17638 5
0.05500 0.05559 0.06945 0.07004 0.08787 0.08846 0.10626 0.10685 0.12370 0.12449 0.14083 0.14161 0.15925 0.16004 0.17764 0.17843 0.21220 0.21319 0.25157 0.25256 0.28433 0.28555 0.35720 0.35843 0.42953 0.43075 0.50201 0.50362 0.52070 f 0.52171 f 0.58075 0.58236 0.67180 f 0.67230 f 0.72543 0.72705 0.87063 0.8722 1.0942 1.0962 1.3176 1.3197 1.5415 1.5436 1.7649 1.7670
… … … … … … … … …
3
0.10278 a,b 0.10787 a, b
5
…
6
0.14185 a, b 0.14264 a, b
4
… … …
7 8
0.17917 b, c 0.17996 b, c 0.21374 b, c 0.2147 b, c 0.2864 b, d 0.2875 b, d 0.3593 b, e 0.3605 b, e
6 1 7 1
0.23622 0.23937 0.24098 0.21063 0.27559 0.27874 0.28035 0.25000
5
…
8
1.25 0.31496 0.31890 0.32142 0.28299 1.5 0.39370 0.39843 0.40094 0.35535 1.75 0.47244 0.47795 0.48047 0.42768 0.55118 0.55748 0.56000 0.50004 1.25 0.55118 0.55500 0.55600 0.51920 0.62992 0.63622 0.63874 0.57878 1.5 0.70870 0.71350 0.71450 0.67030 2.5 0.78740 0.79528 0.79780 0.72346 0.94488 0.95433 0.95827 0.86815 3.5 1.18110 1.19213 1.19606 1.09161 1.41732 1.42992 1.43386 1.31504 4.5 1.65354 1.66772 1.71102 1.53846 1.88976 1.90552 1.98819 1.76189
9
10 12
10 11
6 7 4 7 4 7 8 9
0.43209 e
0.43331 e
14 2
… … … … … … … … … … … … … … … … … … … … … 7 0.58075 0.58236 … … … … … …
14
16 2
18 20
24 3
30
36 4
42
10
48 5
a Minimum and maximum major diameters are 0.00102 larger than shown. b Standard D limit for thread-forming taps. c Minimum and maximum major diameters are 0.00154 larger than shown. d Minimum and maximum major diameters are 0.00205 larger than shown. e Minimum and maximum major diameters are 0.00256 larger than shown.
f These sizes are intended for spark plug applications; use tolerances from Table 2, column D. All dimensions are given in inches. Not all styles of taps are available with all limits listed. For calculation of limits other than those listed, see formulas in Table 4. Table 16. Tap Thread Limits: Metric Sizes, Ground Thread (M Profile Standard Thread Limits in Millimeters) ANSI/ASME B94.9-2008 (R2018)
Pitch Diameter
Major Diameter
D # Limit
D # Limit
Size mm Pitch
Basic Min.
Max.
Basic
D #
Min.
Max.
D #
Min.
Max.
1.6 0.35 1.60 1.628 1.653 1.373 2.00 2.032 2.057 1.740 2.5 0.45 2.50 2.536 2.561 2.208 2 0.4
1.397 1.412 1.764 1.779 2.232 2.247 2.699 2.714 3.142 3.162 3.577 3.597 4.045 4.065 4.512 4.532 5.391 5.416 6.391 6.416 7.222 7.253 9.073 9.104 10.910 10.941 12.751 12.792 14.751 14.792 17.063 f 17.076 f 7.222 f 7.253 f
… … … … … … … … …
3
3
0.5
2.740 a,b
3.00 3.040 3.065 2.675 3.50 3.548 3.573 3.110 4.00 4.056 4.097 3.545
5
2.725 a,b
3.5 0.6
… … …
4
0.7
6
3.603 a,b
3.623 a,b
4
4.5 0.75 4.50 4.560 4.601 4.013
… … …
5 6 7 8
0.8
5.00 5.064 5.105 4.480 1.00 6.00 6.121 5.351 5.391 1.00 7.00 7.121 6.351 6.391 1.25 8.00 8.10 8.164 7.188 1.50 10.0 10.12 10.184 9.026 1.75 12.0 12.14 12.204 10.863 2.00 14.0 14.01 14.164 13.188 1.25 14.0 14.16 14.224 12.701 2.00 16.0 16.16 16.224 14.701 1.50 18.0 18.12 18.184 17.026
7 8
4.551 b,c 5.429 b,c 7.274 b,d 9.125 b,d 10.975 b,e
4.571 b,c 5.454 b,c 7.305 b,d 9.156 b,d 11.006 b,e
… … …
5
9
10 12 14 14 16 18
10 11
6 4 7 4
… … … … … … … … … … … …
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