BS 84

Coarse thread series (B.S.W.) ‐ Basic sizes

Nominal size in	Number of threads per inch (t.p.i.)	Pitch in.	Depth of thread in.	Major diameter in.	Effective diameter in.	Minor diameter in.	Cross-sectional area at bottom of thread in2
1/8 (A)	40	0.025 00	0.016 0	0.125 0	0.109 0	0.093 0	0.006 8
3/16	24	0.041 67	0.026 7	0.187 5	0.160 8	0.134 1	0.014 1
1/4	20	0.050 00	0.032 0	0.250 0	0.218 0	0.186 0	0.027 2
5/16	18	0.055 56	0.035 6	0.312 5	0.276 9	0.241 3	0.045 7
3/8	16	0.062 50	0.040 0	0.375 0	0.335 0	0.295 0	0.068 3
7/16	14	0.071 43	0.045 7	0.437 5	0.391 8	0.346 1	0.094 1
1/2	12	0.083 33	0.053 4	0.500 0	0.446 6	0.393 2	0.121 4
9/16	12	0.083 33	0.053 4	0.562 5	0.509 1	0.455 7	0.163 1
5/8	11	0.090 91	0.058 2	0.625 0	0.566 8	0.508 6	0.203 2
11/16	11	0.090 91	0.058 2	0.687 5	0.629 3	0.571 1	0.256 2
3/4	10	0.100 00	0.064 0	0.750 0	0.686 0	0.622 0	0.303 9
7/8	9	0.111 11	0.071 1	0.875 0	0.803 9	0.732 8	0.421 8
1	8	0.125 00	0.080 0	1.000 0	0.920 0	0.840 0	0.554 2
1 1/8	7	0.142 86	0.091 5	1.125 0	1.033 5	0.942 0	0.696 9
1 1/4	7	0.142 86	0.091 5	1.250 0	1.158 5	1.067 0	0.894 2
1 1/2	6	0.166 67	0.106 7	1.500 0	1.393 3	1.286 6	1.300 0
1 3/4	5	0.200 00	0.128 1	1.750 0	1.621 9	1.493 8	1.753 0
2	4.5	0.222 22	0.142 3	2.000 0	1.857 7	1.715 4	2.311 0
2 1/4	4	0.250 00	0.160 1	2.250 0	2.089 9	1.929 8	2.925 0
2 1/2	4	0.250 00	0.160 1	2.500 0	2.339 9	2.179 8	3.732 0
2 3/4	3.5	0.285 71	0.183 0	2.750 0	2.567 0	2.384 0	4.464 0
3	3.5	0.285 71	0.183 0	3.000 0	2.817 0	2.634 0	5.449 0
3 1/4	3.25	0.307 69	0.197 0	3.250 0	3.053 0	2.856 0	6.406 0
3 1/2	3.25	0.307 69	0.197 0	3.500 0	3.303 0	3.106 0	7.577 0
3 3/4	3	0.333 33	0.213 4	3.750 0	3.536 6	3.323 2	8.674 0
4	3	0.333 33	0.213 4	4.000 0	3.786 6	3.573 2	10.030 0
4 1/2	2.875	0.347 83	0.222 7	4.500 0	4.277 3	4.054 6	12.910 0
5	2.75	0.363 64	0.232 8	5.000 0	4.767 2	4.534 4	16.150 0
5 1/2	2.625	0.380 95	0.243 9	5.500 0	5.256 1	5.012 2	19.730 0
6	2.5	0.400 00	0.256 1	6.000 0	5.743 9	5.487 8	23.650 0

Coarse thread series (B.S.W.) ‐ External threads ‐ Close class ‐ Limits and tolerances

Nominal size in	Number of threads per inch	Major Diameter			Effective Diameter			Minor Diameter
		Max. in	Tol in	Min. in	Max. in	Tol in	Min. in	Max. in	Tol in	Min. in
1/8	40	0.125 0	0.003 5	0.121 5	0.109 0	0.0019	0.107 1	0.093 0	0.004 0	0.089 0
3/16	24	0.187 5	0.004 3	0.183 2	0.160 8	0.002 3	0.158 5	0.134 1	0.005 0	0.129 1
1/4	20	0.250 0	0.004 8	0.245 2	0.218 0	0.002 6	0.215 4	0.186 0	0.005 5	0.180 5
5/16	18	0.312 5	0.005 2	0.307 3	0.276 9	0.002 8	0.274 1	0.241 3	0.005 9	0.235 4
3/8	16	0.375 0	0.005 5	0.369 5	0.335 0	0.003 0	0.332 0	0.295 0	0.006 2	0.288 8
7/16	14	0.437 5	0.005 9	0.4316	0.3918	0.003 2	0.388 6	0.346 1	0.006 7	0.339 4
1/2	12	0.500 0	0.006 3	0.193 7	0.116 6	0.003 1	0.113 2	0.393 2	0.007 2	0.386 0
9/16	12	0.562 5	0.006 5	0.556 0	0.509 1	0.003 6	0.505 5	0.455 7	0.007 4	0.448 3
5/8	11	0.625 0	0.006 7	0.618 3	0.566 8	0.003 7	0.563 1	0.508 6	0.007 6	0.5010
11/16	11	0.687 5	0.006 8	0.680 7	0.629 3	0.003 8	0.625 5	0.571 1	0.007 7	0.563 4
3/4	10	0.750 0	0.007 2	0.742 8	0.686 0	0.004 0	0.682 0	0.622 0	0.008 1	0.613 9
7/8	9	0.875 0	0.007 6	0.876 4	0.803 9	0.004 3	0.799 6	0.732 8	0.008 6	0.724 2
1	8	1.000 0	0.008 0	0.992 0	0.920 0	0.004 5	0.915 5	0.840 0	0.009 1	0.830 9
1 1/8	7	1.125 0	0.008 6	1.116 4	1.033 5	0.004 8	1.028 7	0.942 0	0.009 7	0.932 3
1 1/4	7	1.250 0	0.008 7	1.241 3	1.158 5	0.004 9	1.153 6	1.067 0	0.009 8	1.057 2
1 1/2	6	1.500 0	0.009 4	1.490 6	1.393 3	0.005 3	1.388 0	1.286 6	0.010 6	1.276 0
1 3/4	5	1.750 0	0.010 2	1.739 8	1.621 9	0.005 7	1.616 2	1.493 8	0.0115	1.482 3
2	4.5	2.000 0	0.010 8	1.989 2	1.857 7	0.006 1	1.8516	1.715 4	0.012 2	1.703 2
2 1/4	4	2.250 0	0.0114	2.238 6	2.089 9	0.006 4	2.083 5	1.929 8	0.012 9	1.916 9
2 1/2	4	2.500 0	0.0116	2.488 4	2.339 9	0.006 6	2.333 3	2.179 8	0.013 1	2.166 7
2 3/4	3.5	2.750 0	0.012 3	2.737 7	2.567 0	0.007 0	2.560 0	2.384 0	0.013 9	2.370 1
3	3.5	3.000 0	0.012 5	2.987 5	2.817 0	0.007 2	2.809 8	2.634 0	0.014 1	2.619 9
3 1/4	3.25	3.250 0	0.013 0	3.237 0	3.053 0	0.007 4	3.045 6	2.856 0	0.014 6	2.841 4
3 1/2	3.25	3.500 0	0.013 2	3.486 8	3.303 0	0.007 6	3.295 4	3.106 0	0.014 8	3.091 2
3 3/4	3	3.750 0	0.013 6	3.736 4	3.5366	0.007 9	3.528 7	3.323 2	0.015 4	3.307 8
4	3	4.000 0	0.013 8	3.986 2	3.7866	0.008 0	3.778 6	3.573 2	0.015 5	3.557 7
4 1/2	2.875	4.500 0	0.014 3	4.485 7	4.2773	0.008 4	4.268 9	4.054 6	0.016 1	4.038 5
5	2.75	5.000 0	0.014 8	4.985 2	4.7672	0.008 8	4.758 4	4.534 4	0.0166	4.517 8
5 1/2	2.625	5.500 0	0.015 3	5.484 7	5.2561	0.009 1	5.247 0	5.012 2	0.0171	4.995 1
6	2.5	6.000 0	0.015 8	5.984 2	5.7439	0.009 4	5.734 5	5.487 8	0.0177	5.470 1

Coarse thread series (B.S.W.) ‐ Internal threads ‐ Medium class ‐ Limits and tolerances

Nominal size in	Number of threads per inch	Major Diameter	Effective Diameter			Minor Diameter
		Min. in	Max. in	Tol in	Min. in	Max. in	Tol in	Min. in
1/8	40	0.125 0	0.1119	0.002 9	0.109 0	0.102 0	0.009 0	0.093 0
3/16	24	0.187 5	0.164 3	0.003 5	0.160 8	0.147 4	0.013 3	0.134 1
1/4	20	0.250 0	0.221 9	0.003 9	0.218 0	0.203 0	0.017 0	0.186 0
5/16	18	0.312 5	0.281 1	0.004 2	0.276 9	0.259 4	0.018 1	0.241 3
3/8	16	0.375 0	0.339 5	0.004 5	0.335 0	0.314 5	0.019 5	0.295 0
7/16	14	0.437 5	0.396 6	0.004 8	0.391 8	0.367 4	0.021 3	0.346 1
1/2	12	0.500 0	0.451 8	0.005 2	0.446 6	0.416 9	0.023 7	0.393 2
9/16	12	0.562 5	0.514 4	0.005 3	0.509 1	0.479 4	0.023 7	0.455 7
5/8	11	0.625 0	0.572 4	0.005 6	0.566 8	0.533 8	0.025 2	0.508 6
11/16	11	0.687 5	0.635 1	0.005 8	0.629 3	0.596 3	0.025 2	0.571 1
3/4	10	0.750 0	0.692 0	0.006 0	0.686 0	0.649 0	0.027 0	0.622 0
7/8	9	0.875 0	0.810 3	0.006 4	0.803 9	0.762 0	0.029 2	0.732 8
1	8	1.000 0	0.926 8	0.006 8	0.920 0	0.872 0	0.032 0	0.840 0
1 1/8	7	1.125 0	1.040 7	0.007 2	1.033 5	0.977 6	0.035 6	0.942 0
1 1/4	7	1.250 0	1.165 9	0.007 4	1.158 5	1.102 6	0.035 6	1.067 0
1 1/2	6	1.500 0	1.401 3	0.008 0	1.393 3	1.326 9	0.040 3	1.286 6
1 3/4	5	1.750 0	1.630 5	0.008 6	1.621 9	1.540 8	0.047 0	1.4938
2	4.5	2.000 0	1.866 8	0.009 1	1.857 7	1.766 8	0.0514	1.715 4
2 1/4	4	2.250 0	2.099 5	0.009 6	2.089 9	1.986 8	0.057 0	1.929 8
2 1/2	4	2.500 0	2.349 9	0.010 0	2.339 9	2.236 8	0.057 0	2.179 8
2 3/4	3.5	2.750 0	2.577 4	0.010 4	2.567 0	2.448 1	0.064 1	2.384 0
3	3.5	3.000 0	2.827 8	0.010 8	2.817 0	2.698 I	0.064 1	2.634 0
3 1/4	3.25	3.250 0	3.064 1	0.011 1	3.053 0	2.924 5	0.068 5	2.856 0
3 1/2	3.25	3.500 0	3.314 4	0.011 4	3.303 0	3.174 5	0.068 5	3.106 0
3 3/4	3	3.750 0	3.548 4	0.011 8	3.536 6	3.396 9	0.073 7	3.323 2
4	3	1.000 0	3.798 7	0.012 1	3.786 6	3.616 9	0.073 7	3.573 2
4 1/2	2.875	4.500 0	4.289 9	0.012 6	4.277 3	4.1312	0.076 6	4.054 6
5	2.75	5.000 0	4.780 3	0.013 1	4.767 2	4.614 1	0.079 7	4.534 4
5 1/2	2.625	5.500 0	5.269 8	0.013 7	5.256 1	5.095 4	0.083 2	5.012 2
6	2.5	6.000 0	5.758 0	0.014 1	5.743 9	5.574 8	0.087 0	5.487 8

Coarse thread series (B.S.W.) ‐ External threads ‐ Medium class ‐ Limits and tolerances

Nominal sizes up to and including 3/4 in
Nominal size in	Number of threads per inch	Major Diameter				Effective Diameter				Minor Diameter
		Uncoated or before coating			After coating	Uncoated or before coating			After coating	Uncoated or before coating			After coating
		Max. in	Tol in	Min. in	Max. in	Max. in	Tol in	Min. in	Max. in	Max. in	Tol in	Min. in	Max. in
1/8	40	0.123 8	0.004 5	0.119 3	0.125 0	0.107 8	0.002 9	0.104 9	0.109 0	0.091 8	0.006 1	0.085 7	0.093 0
3/16	24	0.186 3	0.005 5	0.180 8	0.187 5	0.159 6	0.003 5	0.156 1	0.160 8	0.132 9	0.007 6	0.125 3	0.134 1
1/4	20	0.248 8	0.006 1	0.242 7	0.250 0	0.216 8	0.003 9	0.212 9	0.218 0	0.184 8	0.008 4	0.176 4	0.186 0
5/16	18	0.3112	0.006 6	0.304 6	0.312 5	0.275 6	0.004 2	0.271 4	0.276 9	0.240 0	0.008 9	0.2311	0.241 3
3/8	16	0.373 6	0.007 0	0.366 6	0.375 0	0.333 6	0.004 5	0.329 1	0.335 0	0.293 6	0.009 5	0.284 1	0.295 0
7/16	14	0.436 0	0.007 5	0.428 5	0.437 5	0.390 3	0.004 8	0.385 5	0.391 8	0.344 6	0.010 1	0.334 5	0.346 1
1/2	12	0.498 5	0.008 1	0.490 4	0.500 0	0.445 1	0.005 2	0.439 9	0.446 6	0.3917	0.011 0	0.380 7	0.393 2
9/16	12	0.560 9	0.008 2	0.552 7	0.562 5	0.507 5	0.005 3	0.502 2	0.509 1	0.454 1	0.0111	0.443 0	0.455 7
5/8	11	0.623 3	0.008 6	0.614 7	0.625 0	0.565 1	0.005 6	0.559 5	0.566 8	0.506 9	0.0116	0.495 3	0.508 6
11/16	11	0.685 8	0.008 8	0.677 0	0.687 5	0.627 6	0.005 8	0.621 8	0.629 3	0.569 4	0.0118	0.557 6	0.571 1
3/4	10	0.748 2	0.009 2	0.739 0	0.750 0	0.684 2	0.006 0	0.678 2	0.686 0	0.620 2	0.012 3	0.607 9	0.622 0

Nominal sizes above 3/4 in
Nominal size in	Number of threads per inch	Major Diameter			Effective Diameter			Minor Diameter
		Max. in	Tol in	Min. in	Max. in	Tol in	Min. in	Max. in	Tol in	Min. in
7/8	9	0.875 0	0.009 7	0.865 3	0.803 9	0.006 4	0.797 5	0.732 8	0.013 1	0.719 7
1	8	1.000 0	0.010 3	0.989 7	0.920 0	0.006 8	0.913 2	0.840 0	0.013 9	0.826 1
1 1/8	7	1.125 0	0.0110	1.114 0	1.033 5	0.007 2	1.026 3	0.942 0	0.014 8	0.927 2
1 1/4	7	1.250 0	0.0112	1.238 8	1.158 5	0.007 4	1.151 1	1.067 0	0.015 0	1.052 0
1 1/2	6	1.500 0	0.012 1	1.487 9	1.393 3	0.008 0	1.385 3	1.286 6	0.016 2	1.270 4
1 3/4	5	1.750 0	0.013 1	1.736 9	1.621 9	0.008 6	1.613 3	1.493 8	0.017 5	1.476 3
2	4.5	2.000 0	0.013 8	1.986 2	1.857 7	0.009 1	1.848 6	1.715 4	0.018 5	1.696 9
2 1/4	4	2.250 0	0.014 6	2.235 4	2.089 9	0.009 6	2.080 3	1.929 8	0.019 6	1.910 2
2 1/2	4	2.500 0	0.015 0	2.485 0	2.339 9	0.010 0	2.329 9	2.179 8	0.020 0	2.159 8
2 3/4	3.5	2.750 0	0.0 15 7	2.734 3	2.567 0	0.010 4	2.556 6	2.384 0	0.021 1	2.362 9
3	3.5	3.000 0	0.0 16 1	2.983 9	2.817 0	0.010 8	2.806 2	2.634 0	0.021 5	2.612 5
3 1/4	3.25	3.250 0	0.016 7	3.233 3	3.053 0	0.011 1	3.041 9	2.856 0	0.022 2	2.833 8
3 1/2	3.25	3.500 0	0.017 0	3.483 0	3.303 0	0.0114	3.291 0	3.100 0	0.022 5	3.083 5
3 3/4	3	3.750 0	0.017 6	3.732 4	3.536 6	0.0118	3.524 8	3.323 2	0.023 4	3.299 8
4	3	4.000 0	0.017 8	3.982 2	3.786 6	0.012 1	3.774 5	3.573 2	0.023 6	3.549 6
4 1/2	2.875	4.500 0	0.018 5	4.4815	4.277 3	0.012 6	4.264 7	4.054 6	0.024 4	4.030 2
5	2.75	5.000 0	0.019 2	4.980 8	4.767 2	0.013 1	4.754 1	4.534 4	0.025 2	4.509 2
5 1/2	2.625	5.500 0	0.019 8	5.480 2	5.256 1	0.013 7	5.242 4	5.012 2	0.026 0	4.986 2
6	2.5	6.000 0	0.020 5	5.979 5	5.743 9	0.014 1	5.729 8	5.487 8	0.026 8	5.4610

Coarse thread series (B.S.W.) ‐ Internal threads ‐ Normal class ‐ Limits and tolerances

Nominal sizes above 3/4 in
Nominal size in	Number of threads per inch	Major Diameter	Effective Diameter			Minor Diameter
		Max. in	Max. in	Tol in	Min. in	Max. in	Tol in	Min. in
1/8	40	0.125 0	0.113 3	0.004 3	0.109 0	0.102 0	0.009 0	0.093 0
3/16	24	0.187 5	0.166 0	0.005 2	0.160 8	0.147 4	0.013 3	0.134 1
1/4	20	0.250 0	0.223 8	0.005 8	0.218 0	0.203 0	0.017 0	0.186 0
5/16	18	0.312 5	0.283 2	0.006 3	0.276 9	0.259 4	0.018 1	0.2413
3/8	16	0.375 0	0.341 8	0.006 8	0.335 0	0.314 5	0.019 5	0.295 0
7/16	14	0.437 5	0.399 1	0.007 3	0.3918	0.367 4	0.0213	0.346 1
1/2	12	0.500 0	0.454 3	0.007 7	0.446 6	0.4 16 9	0.023 7	0.393 2
9/16	12	0.562 5	0.517 1	0.008 0	0.509 1	0.479 4	0.023 7	0.455 7
5/8	11	0.625 0	0.575 2	0.008 4	0.566 8	0.533 8	0.025 2	0.508 6
11/16	11	0.687 5	0.637 9	0.008 6	0.629 3	0.596 3	0.025 2	0.571 1
3/4	10	0.750 0	0.695 0	0.009 0	0.686 0	0.649 0	0.027 0	0.622 0
7/8	9	0.875 0	0.813 5	0.009 6	0.803 9	0.762 0	0.029 2	0.732 8
1	8	1.000 0	0.930 2	0.010 2	0.920 0	0.872 0	0.032 0	0.840 0
1 1/8	7	1.125 0	1.0112	0.010 7	1.033 5	0.977 6	0.035 6	0.912 0
1 1/4	7	1.250 0	1.169 6	0.011 1	1.158 5	1.102 6	0.035 6	1.067 0
1 1/2	6	1.500 0	1.405 3	0.012 0	1.393 3	1.326 9	0.040 3	1.286 6
1 3/4	5	1.750 0	1.634 8	0.012 9	1.621 9	1.540 8	0.047 0	1.493 8
2	4.5	2.000 0	1.871 4	0.013 7	1.857 7	1.766 8	0.051 4	1.715 4
2 1/4	4	2.250 0	2.104 3	0.014 4	2.089 9	1.986 8	0.057 0	1.929 8
2 1/2	4	2.500 0	2.354 8	0.014 9	2.339 9	2.236 8	0.057 0	2.179 8
2 3/4	3.5	2.750 0	2.582 7	0.015 7	2.567 0	2.448 1	0.064 1	2.384 0
3	3.5	3.000 0	2.833 1	0.016 1	2.817 0	2.698 1	0.064 1	2.634 0
3 1/4	3.25	3.250 0	3.069 7	0.016 7	3.053 0	2.924 5	0.068 5	2.856 0
3 1/2	3.25	3.500 0	3.320 1	0.017 1	3.303 0	3.174 5	0.068 5	3.106 0
3 3/4	3	3.750 0	3.554 3	0.017 7	3.536 6	3.396 9	0.073 7	3.323 2
4	3	4.000 0	3.804 7	0.018 1	3.786 6	3.646 9	0.073 7	3.573 2
4 1/2	2.875	4.500 0	4.296 2	0.018 9	4.277 3	4.131 2	0.076 6	4.054 6
5	2.75	5.000 0	4.786 9	0.019 7	4.767 2	4.614 1	0.079 7	4.534 4
5 1/2	2.625	5.500 0	5.276 6	0.020 5	5.256 1	5.095 4	0.083 2	5.012 2
6	2.5	6.000 0	5.765 1	0.0212	5.743 9	5.574 8	0.087 0	5.487 8

Coarse thread series (B.S.W.) ‐ External threads ‐ Free class ‐ Limits and tolerances

Nominal sizes up to and including 3/4 in
Nominal size in	Number of threads per inch	Major Diameter				Effective Diameter				Minor Diameter
		Uncoated or before coating			After coating	Uncoated or before coating			After coating	Uncoated or before coating			After coating
		Max. in	Tol in	Min. in	Max. in	Max. in	Tol in	Min. in	Max. in	Max. in	Tol in	Min. in	Max. in
1/8	40	0.123 8	0.005 9	0.117 9	0.125 0	0.107 8	0.004 3	0.103 5	0.109 0	0.091 8	0.007 5	0.084 3	0.093 0
3/16	24	0.186 3	0.007 2	0.179 1	0.187 5	0.159 6	0.005 2	0.154 4	0.160 8	0.132 9	0.009 3	0.123 6	0.134 1
1/4	20	0.248 8	0.008 0	0.240 8	0.250 0	0.216 8	0.005 8	0.2110	0.218 0	0.184 8	0.010 3	0.174 5	0.186 0
5/16	18	0.311 2	0.008 7	0.302 5	0.312 5	0.275 6	0.006 3	0.269 3	0.276 9	0.240 0	0.011 0	0.229 0	0.241 3
3/8	16	0.373 6	0.009 3	0.364 3	0.375 0	0.333 6	0.006 8	0.326 8	0.335 0	0.293 6	0.011 8	0.2818	0.295 0
7/16	14	0.436 0	0.010 0	0.426 0	0.437 5	0.390 3	0.007 3	0.383 0	0.391 8	0.344 6	0.012 6	0.332 0	0.346 1
1/2	12	0.498 5	0.010 6	0.487 9	0.500 0	0.445 1	0.007 7	0.437 4	0.446 6	0.391 7	0.013 5	0.378 2	0.393 2
9/16	12	0.560 9	0.010 9	0.550 0	0.562 5	0.507 5	0.008 0	0.499 5	0.509 1	0.454 1	0.013 8	0.440 3	0.455 7
5/8	11	0.623 3	0.011 4	0.611 9	0.625 0	0.565 1	0.008 4	0.556 7	0.566 8	0.506 9	0.014 4	0.492 5	0.508 6
11/16	11	0.685 8	0.011 6	0.674 2	0.687 5	0.627 6	0.008 6	0.619 0	0.629 3	0.569 4	0.014 6	0.554 8	0.571 1
3/4	10	0.748 2	0.012 2	0.736 0	0.750 0	0.684 2	0.009 0	0.675 2	0.686 0	0.620 2	0.015 3	0.604 9	0.622 0

Nominal sizes above 3/4 in
Nominal size in	Number of threads per inch	Major Diameter			Effective Diameter			Minor Diameter
		Max. in	Tol in	Min. in	Max. in	Tol in	Min. in	Max. in	Tol in	Min. in
7/8	9	0.875 0	0.012 9	0.862 1	0.803 9	0.009 6	0.794 3	0.732 8	0.016 3	0.716 5
1	8	1.000 0	0.013 7	0.986 3	0.920 0	0.010 2	0.909 8	0.840 0	0.017 3	0.822 7
1 1/8	7	1.125 0	0.014 5	1.110 5	1.033 5	0.010 7	1.022 8	0.942 0	0.018 3	0.923 7
1 1/4	7	1.250 0	0.014 9	1.235 1	1.158 5	0.011 1	1.147 4	1.067 0	0.018 7	1.048 3
1 1/2	6	1.500 0	0.016 1	1.483 9	1.393 3	0.012 0	1.381 3	1.286 6	0.020 2	1.266 4
1 3/4	5	1.750 0	0.017 4	1.732 6	1.621 9	0.012 9	1.609 0	1.493 8	0.021 8	1.472 0
2	4.5	2.000 0	0.018 4	1.981 6	1.857 7	0.013 7	1.844 0	1.715 4	0.023 1	1.692 3
2 1/4	4	2.250 0	0.019 4	2.230 6	2.089 9	0.014 4	2.075 5	1.929 8	0.024 4	1.905 4
2 1/2	4	2.500 0	0.019 9	2.480 1	2.339 9	0.014 9	2.325 0	2.179 8	0.024 9	2.154 9
2 3/4	3.5	2.750 0	0.021 0	2.729 0	2.567 0	0.015 7	2.551 3	2.384 0	0.026 4	2.357 6
3	3.5	3.000 0	0.021 4	2.978 6	2.817 0	0.016 1	2.800 9	2.634 0	0.026 8	2.607 2
3 1/4	3.25	3.250 0	0.022 3	3.227 7	3.053 0	0.016 7	3.036 3	2.856 0	0.027 8	2.828 2
3 1/2	3.25	3.500 0	0.022 7	3.477 3	3.303 0	0.017 1	3.285 9	3.106 0	0.028 2	3.077 8
3 3/4	3	3.750 0	0.023 5	3.726 5	3.536 6	0.017 7	3.518 9	3.323 2	0.029 3	3.293 9
4	3	4.000 0	0.023 9	3.976 1	3.786 6	0.018 1	3.768 5	3.573 2	0.029 6	3.543 6
4 1/2	2.875	4.500 0	0.024 8	4.475 2	4.277 3	0.018 9	4.258 4	4.054 6	0.030 7	4.023 9
5	2.75	5.000 0	0.025 7	4.974 3	4.767 2	0.019 7	4.747 5	4.534 4	0.0318	4.502 6
5 1/2	2.625	5.500 0	0.026 7	5.473 3	5.256 1	0.020 5	5.235 6	5.012 2	0.032 8	4.979 4
6	2.5	6.000 0	0.027 5	5.972 5	5.743 9	0.021 2	5.722 7	5.487 8	0.033 9	5.453 9

Fine thread series (B.S.F.) ‐ Basic sizes

Nominal size in	Number of threads per inch (t.p.i.)	Pitch in.	Depth of thread in.	Major diameter in.	Effective diameter in.	Minor diameter in.	Cross-sectional area at bottom of thread in2
3/16	32	0.03125	0.020 0	0.187 5	0.167 5	0.147 5	0.017 1
7/32	28	0.035 71	0.022 9	0.218 8	0.195 9	0.173 0	0.023 5
1/4	26	0.038 46	0.024 6	0.250 0	0.225 4	0.200 8	0.0317
9/32	26	0.038 46	0.024 6	0.2812	0.256 6	0.232 0	0.042 3
5/16	22	0.045 45	0.029 1	0.312 5	0.283 4	0.254 3	0.050 8
3/8	20	0.050 00	0.032 0	0.375 0	0.343 0	0.311 0	0.076 0
7/16	18	0.055 56	0.035 6	0.437 5	0.401 9	0.366 3	0.105 4
1/2	16	0.062 50	0.040 0	0.500 0	0.460 0	0.420 0	0.138 5
9/16	16	0.062 50	0.040 0	0.562 5	0.522 5	0.482 5	0.182 8
5/8	14	0.07143	0.045 7	0.625 0	0.579 3	0.533 6	0.223 6
11/16	14	0.07143	0.045 7	0.687 5	0.641 8	0.596 1	0.279 1
3/4	12	0.083 33	0.053 4	0.750 0	0.696 6	0.643 2	0.324 9
7/8	11	0.090 91	0.058 2	0.875 0	0.816 8	0.758 6	0.452 0
1	10	0.100 00	0.064 0	1.000 0	0.936 0	0.872 0	0.597 2
1 1/8	9	0.111 11	0.071 1	1.125 0	1.053 9	0.982 8	0.758 6
1 1/4	9	0.111 11	0.071 1	1.250 0	1.178 9	1.107 8	0.963 9
1 3/8	8	0.125 00	0.080 0	1.375 0	1.295 0	1.215 0	1.159 0
1 1/2	8	0.125 00	0.080 0	1.500 0	1.420 0	1.340 0	1.410 0
1 5/8	8	0.125 00	0.080 0	1.625 0	1.545 0	1.465 0	1.686 0
1 3/4	7	0.142 86	0.091 5	1.750 0	1.658 5	1.567 0	1.928 0
2	7	0.142 86	0.091 5	2.000 0	1.908 5	1.817 0	2.593 0
2 1/4	6	0.166 67	0.106 7	2.250 0	2.143 3	2.036 6	3.258 0
2 1/2	6	0.166 67	0.106 7	2.500 0	2.393 3	2.286 6	4.106 0
2 3/4	6	0.166 67	0.106 7	2.750 0	2.643 3	2.536 6	5.054 0
3	5	0.200 00	0.128 1	3.000 0	2.871 9	2.743 8	5.913 0
3 1/4	5	0.200 00	0.128 1	3.250 0	3.1219	2.993 8	7.039 0
3 1/2	4.5	0.222 22	0.142 3	3.500 0	3.357 7	3.215 4	8.120 0
3 3/4	4.5	0.222 22	0.142 3	3.750 0	3.607 7	3.465 4	9.432 0
4	4.5	0.222 22	0.142 3	4.000 0	3.857 7	3.715 4	10.840 0
4 1/4	4	0.250 00	0.160 1	4.250 0	4.089 9	3.929 8	12.130 0

Fine thread series (B.S.F.) ‐ External threads ‐ Close class ‐ Limits and tolerances

Nominal size in	Number of threads per inch	Major Diameter			Effective Diameter			Minor Diameter
		Max. in	Tol in	Min. in	Max. in	Tol in	Min. in	Max. in	Tol in	Min. in
3/16	32	0.187 5	0.004 0	0.]83 5	0.167 5	0.002 2	0.165 3	0.147 5	0.004 5	0.143 0
7/32	28	0.218 8	0.004 3	0.214 5	0.195 9	0.002 4	0.193 5	0.1730	0.004 9	0.168 1
1/4	26	0.250 0	0.004 5	0.245 5	0.225 4	0.002 5	0.222 9	0.200 8	0.005 0	0.195 8
9/32	26	0.2812	0.004 6	0.276 6	0.256 6	0.002 6	0.254 0	0.232 0	0.005 1	0.226 9
5/16	22	0.312 5	0.004 8	0.307 7	0.283 4	0.002 7	0.280 7	0.254 3	0.005 5	0.248 8
3/8	20	0.375 0	0.005 1	0.369 9	0.343 0	0.002 9	0.340 1	0.311 0	0.005 8	0.305 2
7/16	18	0.437 5	0.005 5	0.432 0	0.401 9	0.003 1	0.398 8	0.366 3	0.006 2	0.360 1
1/2	16	0.500 0	0.005 8	0.494 2	0.460 0	0.003 3	0.456 7	0.420 0	0.006 5	0.413 5
9/16	16	0.562 5	0.005 9	0.556 6	0.522 5	0.003 4	0.519 1	0.482 5	0.006 6	0.475 9
5/8	14	0.625 0	0.006 3	0.618 7	0.579 3	0.003 6	0.575 7	0.533 6	0.007 1	0.526 5
11/16	14	0.687 5	0.006 4	0.681 1	0.641 8	0.003 7	0.638 1	0.596 1	0.007 2	0.588 9
3/4	12	0.750 0	0.006 8	0.743 2	0.696 6	0.003 9	0.692 7	0.643 2	0.007 7	0.635 5
7/8	11	0.875 0	0.007 2	0.867 8	0.816 8	0.004 2	0.812 6	0.758 6	0.008 1	0.750 5
1	10	1.000 0	0.007 6	0.992 4	0.936 0	0.004 4	0.9316	0.872 0	0.008 5	0.863 5
1 1/8	9	1.125 0	0.007 9	l.]17 1	1.053 9	0.004 6	1.049 3	0.982 8	0.008 9	0.973 9
1 1/4	9	1.250 0	0.008 1	1.24 1 9	1.178 9	0.004 8	1.174 1	1.107 8	0.009 1	1.098 7
1 3/8	8	1.375 0	0.008 5	1.366 5	1.295 0	0.005 0	1.290 0	1.215 0	0.009 6	1.205 4
1 1/2	8	1.500 0	0.008 7	1.491 3	1.420 0	0.005 2	1.414 8	1.340 0	0.009 8	1.330 2
1 5/8	8	1.625 0	0.008 8	1.616 2	1.545 0	0.005 3	1.539 7	1.465 0	0.009 9	1.455 1
1 3/4	7	1.750 0	0.009 3	1.740 7	1.658 5	0.005 5	1.653 0	1.567 0	0.010 4	1.556 6
2	7	2.000 0	0.009 5	1.990 5	1.908 5	0.005 8	1.902 7	1.817 0	0.010 7	1.806 3
2 1/4	6	2.250 0	0.010 2	2.239 8	2.143 3	0.006 1	2.137 2	2.036 6	0.011 4	2.025 2
2 1/2	6	2.500 0	0.010 4	2.489 6	2.393 3	0.006 3	2.387 0	2.286 6	0.011 6	2.275 0
2 3/4	6	2.750 0	0.010 6	2.739 4	2.643 3	0.006 5	2.636 8	2.536 6	0.011 9	2.524 7
3	5	3.000 0	0.011 3	2.988 7	2.871 9	0.006 9	2.865 0	2.743 8	0.012 7	2.731 1

Fine thread series (B.S.F.) ‐ Internal threads ‐ Medium class ‐ Limits and tolerances

Nominal size in	Number of threads per inch	Major Diameter	Effective Diameter			Minor Diameter
		Min. in	Max. in	Tol in	Min. in	Max. in	Tol in	Min. in
3/16	32	0.187 5	0.170 8	0.003 3	0.167 5	0.157 7	0.010 2	0.147 5
7/32	28	0.218 8	0.199 5	0.0036	0.195 9	0.184 1	0.011 1	0.1730
1/4	26	0.250 0	0.229 1	0.003 7	0.225 4	0.212 5	0.011 7	0.200 8
9/32	26	0.281 2	0.260 5	0.003 9	0.256 6	0.243 7	0.011 7	0.232 0
5/16	22	0.312 5	0.287 5	0.004 1	0.283 4	0.268 4	0.014 1	0.254 3
3/8	20	0.375 0	0.347 4	0.004 4	0.343 0	0.328 0	0.017 0	0.311 0
7/16	18	0.437 5	0.406 6	0.004 7	0.4019	0.384 4	0.018 1	0.366 3
1/2	16	0.500 0	0.465 0	0.005 0	0.460 0	0.439 5	0.019 5	0.420 0
9/16	16	0.562 5	0.527 7	0.005 2	0.522 5	0.502 0	0.019 5	0.482 5
5/8	14	0.625 0	0.584 7	0.005 4	0.579 3	0.554 9	0.0213	0.533 6
11/16	14	0.687 5	0.647 4	0.005 6	0.641 8	0.617 4	0.0213	0.596 1
3/4	12	0.750 0	0.702 5	0.005 9	0.696 6	0.666 9	0.023 7	0.643 2
7/8	11	0.875 0	0.823 0	0.006 2	0.816 8	0.783 8	0.025 2	0.758 6
1	10	1.000 0	0.942 6	0.006 6	0.936 0	0.899 0	0.027 0	0.872 0
1 1/8	9	1.125 0	1.060 8	0.006 9	1.053 9	1.012 0	0.029 2	0.982 8
1 1/4	9	1.250 0	1.186 1	0.007 2	1.178 9	1.137 0	0.029 2	1.107 8
1 3/8	8	1.375 0	1.302 5	0.007 5	1.295 0	1.247 0	0.032 0	1.215 0
1 1/2	8	1.500 0	1.427 7	0.007 7	1.420 0	1.372 0	0.032 0	1.340 0
1 5/8	8	1.625 0	1.552 9	0.007 9	1.545 0	1.497 0	0.032 0	1.465 0
1 3/4	7	1.750 0	1.666 8	0.008 3	1.658 5	1.602 6	0.035 6	1.567 0
2	7	2.000 0	1.917 2	0.008 7	1.908 5	1.852 6	0.035 6	1.817 0
2 1/4	6	2.250 0	2.152 5	0.009 2	2.143 3	2.076 9	0.040 3	2.036 6
2 1/2	6	2.500 0	2.402 8	0.009 5	2.393 3	2.326 9	0.040 3	2.286 6
2 3/4	6	2.750 0	2.653 1	0.009 8	2.643 3	2.576 9	0.040 3	2.536 6
3	5	3.000 0	2.882 2	0.010 3	2.871 9	2.790 8	0.047 0	2.743 8

Fine thread series (B.S.F.) ‐ External threads ‐ Medium class ‐ Limits and tolerances

Nominal sizes up to and including 3/4 in
Nominal size in	Number of threads per inch	Major Diameter				Effective Diameter				Minor Diameter
		Uncoated or before coating			After coating	Uncoated or before coating			After coating	Uncoated or before coating			After coating
		Max. in	Tol in	Min. in	Max. in	Max. in	Tol in	Min. in	Max. in	Max. in	Tol in	Min. in	Max. in
3/16	32	0.186 4	0.005 1	0.181 3	0.187 5	0.166 4	0.003 3	0.163 1	0.167 5	0.146 4	0.006 8	0.139 6	0.147 5
7/32	28	0.217 7	0.005 5	0.212 2	0.218 8	0.194 8	0.003 6	0.1912	0.195 9	0.171 9	0.007 4	0.164 5	0.173 0
1/4	26	0.248 9	0.005 7	0.243 2	0.250 0	0.224 3	0.003 7	0.220 6	0.225 4	0.199 7	0.007 6	0.192 1	0.200 8
9/32	26	0.280 0	0.005 9	0.274 1	0.2812	0.255 4	0.003 9	0.251 5	0.256 6	0.230 8	0.007 8	0.223 0	0.232 0
5/16	22	0.3113	0.006 2	0.305 1	0.312 5	0.282 2	0.004 1	0.278 1	0.283 4	0.253 1	0.008 4	0.244 7	0.254 3
3/8	20	0.373 7	0.006 6	0.367 1	0.375 0	0.341 7	0.004 4	0.337 3	0.343 0	0.309 7	0.008 9	0.300 8	0.311 0
7/16	18	0.436 1	0.007 1	0.429 0	0.437 5	0.400 5	0.004 7	0.395 8	0.401 9	0.364 9	0.009 4	0.355 5	0.366 3
1/2	16	0.498 5	0.007 5	0.491 0	0.500 0	0.458 5	0.005 0	0.453 5	0.460 0	0.418 5	0.010 0	0.408 5	0.420 0
9/16	16	0.561 0	0.007 7	0.553 3	0.562 5	0.521 0	0.005 2	0.515 8	0.522 5	0.4810	0.010 2	0.470 8	0.482 5
5/8	14	0.623 4	0.008 1	0.615 3	0.625 0	0.577 7	0.005 4	0.572 3	0.579 3	0.532 0	0.010 7	0.521 3	0.533 6
11/16	14	0.685 8	0.008 3	0.677 5	0.687 5	0.640 ]	0.005 6	0.634 5	0.641 8	0.594 4	0.010 9	0.583 5	0.596 1
3/4	12	0.748 2	0.008 8	0.739 4	0.750 0	0.694 8	0.005 9	0.688 9	0.696 6	0.641 4	0.011 7	0.629 7	0.643 2

Nominal sizes above 3/4 in
Nominal size in	Number of threads per inch	Major Diameter			Effective Diameter			Minor Diameter
		Max. in	Tol in	Min. in	Max. in	Tol in	Min. in	Max. in	Tol in	Min. in
7/8	11	0.875 0	0.009 2	0.865 8	0.816 8	0.006 2	0.810 6	0.758 6	0.012 2	0.746 4
1	10	1.000 0	0.009 8	0.990 2	0.936 0	0.006 6	0.929 4	0.872 0	0.012 9	0.859 1
1 1/8	9	1.125 0	0.010 2	1.114 8	1.053 9	0.006 9	1.047 0	0.982 8	0.013 6	0.969 2
1 1/4	9	1.250 0	0.010 5	1.239 5	1.178 9	0.007 2	1.171 7	1.107 8	0.013 9	1.093 9
1 3/8	8	1.375 0	0.011 0	1.364 0	1.295 0	0.007 5	1.287 5	1.215 0	0.014 6	I.ZOO 4
1 1/2	8	1.500 0	0.011 2	1.488 8	1.420 0	0.007 7	1.412 3	1.340 0	0.014 8	1.325 2
1 5/8	8	1.625 0	0.011 5	1.613 5	1.545 0	0.007 9	1.537 1	1.465 0	0.015 0	1.450 0
1 3/4	7	1.750 0	0.012 0	1.738 0	1.658 5	0.008 3	1.650 2	1.567 0	0.0158	1.551 2
2	7	2.000 0	0.012 4	1.987 6	1.908 5	0.008 7	1.899 8	1.817 0	0.016 2	1.800 8
2 1/4	6	2.250 0	0.013 2	2.236 8	2.143 3	0.009 2	2.134 1	2.036 6	0.017 3	2.019 3
2 1/2	6	2.500 0	0.013 6	2.486 4	2.393 3	0.009 5	2.383 8	2.286 6	0.017 7	2.268 9
2 3/4	6	2.750 0	0.013 9	2.736 1	2.643 3	0.009 8	2.633 5	2.536 6	0.018 0	2.518 6
3	5	3.000 0	0.014 8	2.985 2	2.871 9	0.010 3	2.861 6	2.743 8	0.019 3	2.724 5

Fine thread series (B.S.F.) ‐ Internal threads ‐ Normal class ‐ Limits and tolerances

Nominal size in	Number of threads per inch	Major Diameter	Effective Diameter			Minor Diameter
		Min. in	Max. in	Tol in	Min. in	Max. in	Tol in	Min. in
3/16	32	0.187 5	0.172 5	0.005 0	0.167 5	0.157 7	0.010 2	0.147 5
7/32	28	0.218 8	0.201 2	0.005 3	0.195 9	0.184 1	0.011 1	0.173 0
1/4	26	0.250 0	0.231 0	0.005 6	0.225 4	0.212 5	0.011 7	0.200 8
9/32	26	0.281 2	0.262 4	0.005 8	0.256 6	0.243 7	0.011 7	0.232 0
5/16	22	0.312 5	0.289 6	0.006 2	0.283 4	0.268 4	0.014 1	0.254 3
3/8	20	0.375 0	0.349 6	0.006 6	0.343 0	0.328 0	0.017 0	0.311 0
7/16	18	0.437 5	0.408 9	0.007 0	0.401 9	0.384 4	0.018 1	0.366 3
1/2	16	0.500 0	0.467 4	0.007 4	0.460 0	0.439 5	0.019 5	0.420 0
9/16	16	0.562 5	0.530 2	0.007 7	0.522 5	0.502 0	0.019 5	0.182 5
5/8	14	0.625 0	0.587 4	0.008 1	0.579 3	0.554 9	0.0213	0.533 6
11/16	14	0.687 5	0.650 2	0.008 4	0.641 8	0.617 4	0.0213	0.596 1
3/4	12	0.750 0	0.705 4	0.008 8	0.696 6	0.666 9	0.023 7	0.643 2
7/8	11	0.875 0	0.826 1	0.009 3	0.816 8	0.783 8	0.025 2	0.758 6
1	10	1.000 0	0.945 9	0.009 9	0.936 0	0.899 0	0.027 0	0.872 0
1 1/8	9	1.125 0	1.064 3	0.010 4	1.053 9	1.012 0	0.029 2	0.982 8
1 1/4	9	1.250 0	1.189 7	0.010 8	1.178 9	1.137 0	0.029 2	1.107 8
1 3/8	8	1.375 0	1.306 3	0.0113	1.295 0	1.247 0	0.032 0	1.215 0
1 1/2	8	1.500 0	1.431 6	0.0116	1.420 0	1.372 0	0.032 0	1.340 0
1 5/8	8	1.625 0	1.556 9	0.0119	1.545 0	1.497 0	0.032 0	1.465 0
1 3/4	7	1.750 0	1.670 9	0.012 4	1.658 5	1.602 6	0.035 6	1.567 0
2	7	2.000 0	1.921 5	0.013 0	1.908 5	1.852 6	0.035 6	1.817 0
2 1/4	6	2.250 0	2.157 0	0.013 7	2.143 3	2.076 9	0.040 3	2.036 6
2 1/2	6	2.500 0	2.407 5	0.014 2	2.393 3	2.326 9	0.040 3	2.286 6
2 3/4	6	2.750 0	2.658 0	0.014 7	2.643 3	2.576 9	0.040 3	2.536 6
3	5	3.000 0	2.887 4	0.015 5	2.871 9	2.790 8	0.047 0	2.743 8

Fine thread series (B.S.F.) ‐ External threads ‐ Free class ‐ Limits and tolerances

Nominal sizes up to and including 3/4 in
Nominal size in	Number of threads per inch	Major Diameter				Effective Diameter				Minor Diameter
		Uncoated or before coating			After coating	Uncoated or before coating			After coating	Uncoated or before coating			After coating
		Max. in	Tol in	Min. in	Max. in	Max. in	Tol in	Min. in	Max. in	Max. in	Tol in	Min. in	Max. in
3/16	32	0.186 4	0.006 8	0.179 6	0.187 5	0.166 4	0.005 0	0.161 4	0.167 5	0.146 4	0.008 5	0.137 9	0.147 5
7/32	28	0.217 7	0.007 2	0.210 5	0.218 8	0.194 8	0.005 3	0.189 5	0.195 9	0.171 9	0.009 1	0.162 8	0.173 0
1/4	26	0.248 9	0.007 6	0.241 3	0.250 0	0.224 3	0.005 6	0.218 7	0.225 4	0.199 7	0.009 5	0.190 2	0.200 8
9/32	26	0.280 0	0.007 8	0.272 2	0.281 2	0.255 4	0.005 8	0.249 6	0.256 6	0.230 8	0.009 7	0.221 1	0.232 0
5/16	22	0.311 3	0.008 3	0.303 0	0.312 5	0.282 2	0.006 2	0.276 0	0.283 4	0.253 1	0.010 5	0.242 6	0.254 3
3/8	20	0.373 7	0.008 8	0.364 9	0.375 0	0.341 7	0.006 6	0.335 1	0.343 0	0.309 7	0.011 1	0.298 6	0.311 0
7/16	18	0.436 1	0.009 4	0.426 7	0.437 5	0.400 5	0.007 0	0.393 5	0.401 9	0.364 9	0.011 7	0.353 2	0.366 3
1/2	16	0.498 5	0.009 9	0.488 6	0.500 0	0.458 5	0.007 4	0.451 1	0.460 0	0.418 5	0.012 4	0.406 1	0.420 0
9/16	16	0.561 0	0.010 2	0.550 8	0.562 5	0.521 0	0.007 7	0.513 3	0.522 5	0.481 0	0.012 7	0.468 3	0.482 5
5/8	14	0.623 4	0.010 8	0.612 6	0.625 0	0.577 7	0.008 1	0.569 6	0.579 3	0.532 0	0.013 4	0.518 6	0.533 6
11/16	14	0.685 8	0.011 1	0.674 7	0.687 5	0.640 1	0.008 4	0.631 7	0.641 8	0.594 4	0.013 7	0.580 7	0.596 1
3/4	12	0.748 2	0.011 7	0.736 5	0.750 0	0.694 8	0.008 8	0.686 0	0.696 6	0.641 4	0.014 6	0.626 8	0.643 2

Nominal sizes above 3/4 in
Nominal size in	Number of threads per inch	Major Diameter			Effective Diameter			Minor Diameter
		Max. in	Tol in	Min. in	Max. in	Tol in	Min. in	Max. in	Tol in	Min. in
7/8	11	0.875 0	0.012 3	0.862 7	0.816 8	0.009 3	0.807 5	0.758 6	0.015 3	0.743 3
1	10	1.000 0	0.013 1	0.986 9	0.936 0	0.009 9	0.926 1	0.872 0	0.016 2	0.855 8
1 1/8	9	1.125 0	0.013 7	1.111 3	1.053 9	0.010 4	1.043 5	0.982 8	0.017 1	0.965 7
1 1/4	9	1.250 0	0.014 1	1.235 9	1.178 9	0.010 8	1.168 1	1.107 8	0.017 5	1.090 3
1 3/8	8	1.375 0	0.014 8	1.360 2	1.295 0	0.011 3	1.283 7	1.215 0	0.018 4	1.196 6
1 1/2	8	1.500 0	0.015 1	1.484 9	1.420 0	0.011 6	1.408 4	1.340 0	0.018 7	1.321 3
1 5/8	8	1.625 0	0.015 5	1.609 5	1.545 o	0.011 9	1.533 1	1.465 o	0.019 0	1.446 0
1 3/4	7	1.750 0	0.016 2	1.733 8	1.658 5	0.012 4	1.646 1	1.567 0	0.020 0	1.547 0
2	7	2.000 0	0.016 8	1.983 2	1.908 5	0.013 o	1.895 5	1.817 o	0.020 5	1.796 5
2 1/4	6	2.250 0	0.017 8	2.232 2	2.143 3	0.013 7	2.129 6	2.036 6	0.021 9	2.014 7
2 1/2	6	2.500 0	0.018 3	2.481 7	2.393 3	0.014 2	2.379 1	2.286 6	0.022 4	2.264 2
2 3/4	6	2.750 0	0.018 8	2.731 2	2.643 3	0.014 7	2.628 6	2.536 6	0.022 9	2.513 7
3	5	3.000 0	0.019 9	2.980 1	2.871 9	0.015 5	2.856 4	2.743 8	0.024 4	2.719 4