Tap Charts

Metric Form Taps
Metric Cut Taps
Standard Form Taps
Standard Cut Taps

Pitch			75% Thread		70% Thread		65% Thread		60% Thread		55% Thread
Tap Size	M	MF	(mm)	(in)	(mm)	(in)	(mm)	(in)	(mm)	(in)	(mm)	(in)
M1.6	0.35	–	1.42	0.0559	1.43	0.0563	1.45	0.0571	1.46	0.0575	1.47	0.0579
M1.7	0.35	–	1.56	0.0617	1.57	0.0620	1.58	0.0623	1.59	0.0627	1.60	0.0630
M1.8	0.35	–	1.62	0.0638	1.63	0.0642	1.65	0.0650	1.66	0.0654	1.67	0.0657
M2	0.4	–	1.8	0.0709	1.81	0.0713	1.82	0.0717	1.84	0.0724	1.85	0.0728
M2.2	0.45	–	1.97	0.0776	1.99	0.0783	2.00	0.0787	2.02	0.0795	2.03	0.0799
M2.5	0.45	–	2.27	0.0894	2.29	0.0902	2.30	0.0906	2.32	0.0913	2.33	0.0917
M2.6	0.45	–	2.41	0.0949	2.42	0.0953	2.43	0.0957	2.44	0.0962	2.45	0.0966
M3	0.5 –	– 0.35	2.75 2.86	0.1083 0.1126	2.76 2.87	0.1087 0.1130	2.78 2.88	0.1094 0.1134	2.80 2.89	0.1102 0.1138	2.81 2.90	0.1106 0.1142
M3.5	0.6	–	3.19	0.1256	3.21	0.1264	3.23	0.1272	3.26	0.1283	3.28	0.1291
M4	0.7 –	– 0.5	3.64 3.75	0.1433 0.1476	3.67 3.76	0.1445 0.1480	3.69 3.78	0.1453 0.1488	3.71 3.80	0.1461 0.1496	3.74 3.81	0.1472 0.1500
M4.5	0.75	–	4.12	0.1622	4.14	0.1630	4.17	0.1642	4.19	0.1650	4.22	0.1661
M5	0.8 –	– 0.5	4.59 4.75	0.1807 0.1870	4.62 4.76	0.1819 0.1874	4.65 4.78	0.1831 0.1882	4.67 4.80	0.1839 0.1890	4.70 4.81	0.1850 0.1894
M6	1 –	– 0.75	5.49 5.62	0.2161 0.2213	5.52 5.64	0.2173 0.2220	5.56 5.67	0.2189 0.2232	5.59 5.69	0.2201 0.2240	5.63 5.72	0.2217 0.2252
M7	1	–	6.49	0.2555	6.52	0.2567	6.56	0.2583	6.59	0.2594	6.63	0.2610
M8	1.25 – –	– 1 0.75	7.36 7.49 7.62	0.2898 0.2949 0.3000	7.41 7.52 7.64	0.2917 0.2961 0.3008	7.45 7.56 7.67	0.2933 0.2976 0.3020	7.49 7.59 7.69	0.2949 0.2988 0.3028	7.53 7.63 7.72	0.2965 0.3004 0.3039
M10	1.5 – – –	– 1.25 1 0.75	9.24 9.36 9.49 9.62	9.29 9.41 9.52 9.64	9.29 9.41 9.52 9.64	0.3657 0.3705 0.3748 0.3795	9.34 9.45 9.56 9.67	0.3677 0.3720 0.3764 0.3807	9.39 9.49 9.59 9.69	0.3697 0.3736 0.3776 0.3815	9.44 9.53 9.63 9.72	0.3717 0.3752 0.3791 0.3827
M12	1.75 – – –	– 1.5 1.25 1	11.11 11.24 11.36 11.49	11.17 11.29 11.41 11.52	11.17 11.29 11.41 11.52	0.4398 0.4484 0.4492 0.4535	11.23 11.34 11.45 11.56	0.4421 0.4465 0.4508 0.4551	11.29 11.39 11.49 11.59	0.4445 0.4484 0.4524 0.4563	11.35 11.44 11.53 11.63	0.4469 0.4504 0.4539 0.4579
M14	2 –	– 1.5	12.98 13.24	13.05 13.29	13.05 13.29	0.5138 0.5232	13.12 13.34	0.5165 0.5252	13.18 13.39	0.5189 0.5272	13.25 13.44	0.5217 0.5291
M16	2 –	– 1.5	14.98 15.24	15.05 15.29	15.05 15.29	0.5925 0.6020	15.12 15.34	0.5953 0.6039	15.18 15.39	0.5976 0.6059	15.25 15.44	0.6004 0.6079
M18	2.5 –	– 1.5	16.73 17.24	16.81 17.29	16.81 17.29	0.6618 0.6807	16.90 17.34	0.6654 0.6827	16.98 17.39	0.6685 0.6846	17.07 17.44	0.6720 0.6866
M20	2.5 – –	– 1.5 1	18.73 19.24 19.49	18.81 19.29 19.52	18.81 19.29 19.52	0.7406 0.7594 0.7685	18.90 19.34 19.56	0.7441 0.7614 0.7701	18.98 19.39 19.59	0.7472 0.7634 0.7713	19.07 19.44 19.63	0.7508 0.7654 0.7728
M22	2.5 – –	– 2 1.5	20.73 20.98 21.24	20.81 21.05 21.29	20.81 21.05 21.29	0.8193 0.8287 0.8382	20.90 21.12 21.34	0.8228 0.8315 0.8402	20.98 21.18 21.39	0.8260 0.8339 0.8421	21.07 21.25 21.44	0.8295 0.8366 0.8441
M24	3 – –	– 2 1.5	22.47 22.98 23.24	22.57 23.05 23.29	22.57 23.05 23.29	0.8886 0.9075 0.9169	22.67 23.12 23.34	0.8925 0.9102 0.9189	22.78 23.18 23.39	0.8969 0.9126 0.9209	22.88 23.25 23.44	0.9008 0.9154 0.9228

Pitch			80% Thread		75% Thread		70% Thread		65% Thread		60% Thread
Tap Size	M	MF	(mm)	(in)	(mm)	(in)	(mm)	(in)	(mm)	(in)	(mm)	(in)
M1.6	0.35	–	1.24	0.0488	1.26	0.0496	1.28	0.0504	1.30	0.0512	1.33	0.0524
M1.7	0.35	–	1.33	0.0524	1.36	0.0535	1.38	0.0543	1.40	0.0551	1.42	0.0559
M1.8	0.35	–	1.44	0.0567	1.46	0.0575	1.48	0.0583	1.50	0.0591	1.53	0.0602
M2	0.4	–	1.58	0.0622	1.61	0.0634	1.64	0.0646	1.66	0.0654	1.69	0.0665
M2.2	0.45	–	1.73	0.0681	1.76	0.0693	1.79	0.0705	1.82	0.0717	1.85	0.0728
M2.5	0.45	–	2.03	0.0799	2.06	0.0811	2.09	0.0823	2.12	0.0835	2.15	0.0846
M2.6	0.45	–	2.13	0.0839	2.16	0.0850	2.19	0.0862	2.22	0.0874	2.25	0.0886
M3	0.5 –	– 0.35	2.48 2.63	0.0976 0.1035	2.51 2.66	0.0988 0.1047	2.55 2.68	0.1004 0.1055	2.58 2.70	0.1016 0.1063	2.61 2.72	0.1028 0.1071
M3.5	0.6	–	2.88	0.1134	2.92	0.1150	2.95	0.1161	2.99	0.1177	3.03	0.1193
M4	0.7 –	– 0.5	3.27 3.48	0.1287 0.1370	3.32 3.51	0.1307 0.1382	3.36 3.54	0.1323 0.1394	3.41 3.58	0.1343 0.1409	3.45 3.61	0.1358 0.1421
M4.5	0.75	–	3.72	0.1465	3.77	0.1484	3.82	0.1504	3.87	0.1524	3.92	0.1543
M5	0.8 –	– 0.5	4.17 4.48	0.1642 0.1764	4.22 4.51	0.1661 0.1776	4.27 4.54	0.1681 0.1787	4.32 4.58	0.1701 0.1803	4.38 4.61	0.1724 0.1815
M6	1 –	– 0.75	4.96 5.22	0.1953 0.2055	5.03 5.27	0.1980 0.2075	5.09 5.32	0.2004 0.2094	5.16 5.37	0.2031 0.2114	5.22 5.41	0.2055 0.2130
M7	1	–	5.96	0.2346	6.03	0.2374	6.09	0.2398	6.16	0.2425	6.22	0.2449
M8	1.25 – –	– 1 0.75	6.70 6.96 7.22	0.2638 0.2740 0.2843	6.78 7.03 7.27	0.2669 0.2768 0.2862	6.86 7.09 7.32	0.2701 0.2791 0.2882	6.94 7.16 7.37	0.2732 0.2819 0.2902	7.03 7.22 7.41	0.2768 0.2843 0.2917
M10	1.5 – – –	– 1.25 1 0.75	8.44 8.70 8.96 9.22	0.3323 0.3425 0.3528 0.3630	8.54 8.78 9.03 9.27	0.3362 0.3457 0.3555 0.3650	8.64 8.86 9.09 9.32	0.3402 0.3488 0.3579 0.3669	8.73 8.94 9.16 9.37	0.3437 0.3520 0.3606 0.3689	8.83 9.03 9.22 9.41	0.3476 0.3555 0.3630 0.3705
M12	1.75 – – –	– 1.5 1.25 1	10.18 10.44 10.70 10.96	0.4008 0.4110 0.4213 0.4315	10.30 10.54 10.78 11.03	0.4055 0.4150 0.4244 0.4343	10.41 10.64 10.86 11.09	0.4098 0.4189 0.4276 0.4366	10.52 10.73 10.94 11.16	0.4142 0.4224 0.4307 0.4394	10.64 10.83 11.03 11.22	0.4189 0.4264 0.4343 0.4417
M14	2 –	– 1.5	11.92 12.44	0.4693 0.4898	12.05 12.54	0.4744 0.4937	12.18 12.64	0.4795 0.4976	12.31 12.73	0.4846 0.5012	12.44 12.83	0.4898 0.5051
M16	2 –	– 1.5	13.92 14.44	0.5480 0.5685	14.05 14.54	0.5531 0.5724	14.18 14.64	0.5583 0.5764	14.31 14.73	0.5634 0.5799	14.44 14.83	0.5685 0.5839
M18	2.5 –	– 1.5	15.40 16.44	0.6063 0.6472	15.56 16.54	0.6126 0.6512	15.73 16.64	0.6193 0.6551	15.89 16.73	0.6256 0.6587	16.05 16.83	0.6319 0.6626
M20	2.5 – –	– 1.5 1	17.40 18.44 18.96	0.6850 0.7260 0.7465	17.56 18.54 19.03	0.6913 0.7299 0.7492	17.73 18.64 19.09	0.6980 0.7339 0.7516	17.89 18.73 19.16	0.7043 0.7374 0.7543	18.05 18.83 19.22	0.7106 0.7413 0.7567
M22	2.5 – –	– 2 1.5	19.40 19.92 20.44	0.7638 0.7843 0.8047	19.56 20.05 20.54	0.7701 0.7894 0.8087	19.73 20.18 20.64	0.7768 0.7945 0.8126	19.89 20.31 20.73	0.7831 0.7996 0.8161	20.05 20.44 20.83	0.7894 0.8047 0.8201
M24	3 – –	– 2 1.5	20.88 21.92 22.44	0.8220 0.8630 0.8835	21.08 22.05 22.54	0.8299 0.8681 0.8874	21.27 22.18 22.64	0.8374 0.8732 0.8913	21.47 22.31 22.73	0.8453 0.8783 0.8949	21.66 22.44 22.83	0.8528 0.8835 0.8988
M27	3 – –	– 2 1.5	23.88 24.92 25.44	0.9402 0.9811 1.0016	24.08 25.05 25.54	0.9480 0.9862 1.0055	24.27 25.18 25.64	0.9555 0.9913 1.0094	24.47 25.31 25.73	0.9634 0.9965 1.0130	24.66 25.44 25.83	0.9709 1.0016 1.0169
M30	3.5 – –	– 2 1.5	26.36 27.92 28.44	1.0378 1.0992 1.1197	26.59 28.05 28.54	1.0469 1.1043 1.1236	26.82 28.18 28.64	1.0559 1.1094 1.1276	27.04 28.31 28.73	1.0646 1.1146 1.1311	27.27 28.44 28.83	1.0736 1.1197 1.1350
M33	3.5 –	– 2	29.36 30.92	1.1559 1.2173	29.59 31.05	1.1650 1.2224	29.82 31.18	1.1740 1.2276	30.04 31.31	1.1827 1.2327	30.27 31.44	1.1917 1.2378
M36	4 – –	– 3 2	31.84 32.88 33.92	1.2535 1.2945 1.3354	32.10 33.08 34.05	1.2638 1.3024 1.3406	32.36 33.27 34.18	1.2740 1.3098 1.3457	32.62 33.47 34.31	1.2843 1.3177 1.3508	32.88 33.66 34.44	1.2945 1.3252 1.3559
M39	4 –	– 2	34.84 36.92	1.3717 1.4535	35.10 37.05	1.3819 1.4587	35.36 37.18	1.3921 1.4638	35.62 37.31	1.4024 1.4689	35.88 37.44	1.4126 1.4740
M42	4.5 – –	– 3 2	37.32 38.88 39.92	1.4693 1.5307 1.5717	37.62 39.08 40.05	1.4811 1.5386 1.5768	37.91 39.27 40.18	1.4925 1.5461 1.5819	38.20 39.47 40.31	1.5039 1.5539 1.5870	38.49 39.66 40.44	1.5154 1.5614 1.5921

Threads Per Inch				75% Thread	70% Thread	65% Thread	60% Thread	55% Thread
Tap Size	UNC	UNF	8-Pitch	(in)	(in)	(in)	(in)	(in)
0	–	80	–	0.0536	0.0540	0.0545	0.0549	0.0554
1	64 –	– 72	–	0.0650 0.0659	0.0655 0.0663	0.0661 0.0669	0.0666 0.0673	0.0672 0.0679
2	56 –	– 64	–	0.0769 0.0780	0.0774 0.0785	0.0781 0.0791	0.0787 0.0796	0.0794 0.0802
3	48 –	– 56	–	0.0884 0.0899	0.0890 0.0904	0.0898 0.0911	0.0905 0.0917	0.0913 0.0924
4	40 –	– 48	–	0.0993 0.1014	0.1000 0.1020	0.1010 0.1028	0.1018 0.1035	0.1028 0.1043
5	40 –	– 44	–	0.1123 0.1134	0.1130 0.1141	0.1140 0.1150	0.1148 0.1157	0.1158 0.1166
6	32 –	– 40	–	0.1221 0.1253	0.1230 0.1260	0.1243 0.1270	0.1252 0.1278	0.1264 0.1288
8	32 –	– 36	–	0.1481 0.1498	0.1490 0.1507	0.1503 0.1518	0.1512 0.1526	0.1524 0.1537
10	24 –	– 32	–	0.1688 0.1741	0.1700 0.1750	0.1716 0.1762	0.1729 0.1772	0.1746 0.1784
12	24 –	– 28	–	0.1948 0.1978	0.1960 0.1990	0.1976 0.2002	0.1989 0.2014	0.2006 0.2028
1/4	20 –	– 28	–	0.2245 0.2318	0.2260 0.2329	0.2279 0.2342	0.2295 0.2354	0.2315 0.2389
5/16	18 –	– 24	–	0.2842 0.2912	0.2861 0.2967	0.2879 0.2941	0.2898 0.2955	0.2917 0.2969
3/8	16 –	– 24	–	0.3431 0.3537	0.3452 0.3552	0.3474 0.3566	0.3495 0.3580	0.3516 0.3594
7/16	14 –	– 20	–	0.4011 0.4120	0.4035 0.4137	0.4059 0.4154	0.4084 0.4171	0.4108 0.4188
1/2	13 –	– 20	–	0.4608 0.4745	0.4634 0.4762	0.4660 0.4779	0.4686 0.4796	0.4712 0.4813
9/16	12 –	– 18	–	0.5200 0.5342	0.5229 0.5361	0.5257 0.5379	0.5285 0.5398	0.5313 0.5417
5/8	11 –	– 18	–	0.5787 0.5967	0.5817 0.5986	0.5848 0.6004	0.5879 0.6023	0.5910 0.6042
3/4	10 –	– 16	–	0.6990 0.7181	0.7024 0.7202	0.7058 0.7224	0.7092 0.7245	0.7126 0.7266
7/8	9 –	– 14	–	0.8183 0.8386	0.8221 0.8410	0.8259 0.8434	0.8297 0.8459	0.8334 0.8483
1	8 –	– 12	–	0.9363 0.9575	0.9405 0.9603	0.9448 0.9632	0.9490 0.9660	0.9533 0.9866

Threads Per Inch				80% Thread	75% Thread	70% Thread	65% Thread	60% Thread
Tap Size	UNC	UNF	8-Pitch	(in)	(in)	(in)	(in)	(in)
0	–	80	–	0.0470	0.0478	0.0486	0.0494	0.0503
1	64 –	– 72	– –	0.0568 0.0586	0.0578 0.0595	0.0588 0.0604	0.0598 0.0613	0.0608 0.0622
2	56 –	– 64	– –	0.0674 0.0698	0.0686 0.0708	0.0698 0.0718	0.0709 0.0728	0.0721 0.0738
3	48 –	– 56	– –	0.0774 0.0804	0.0787 0.0816	0.0801 0.0828	0.0814 0.0839	0.0828 0.0851
4	40 –	– 48	– –	0.0860 0.0904	0.0876 0.0917	0.0893 0.0931	0.0909 0.0944	0.0925 0.0958
5	40 –	– 44	– –	0.0990 0.1014	0.1006 0.1029	0.1023 0.1043	0.1039 0.1058	0.1055 0.1073
6	32 –	– 40	– –	0.1055 0.1120	0.1076 0.1136	0.1096 0.1153	0.1116 0.1169	0.1136 0.1185
8	32 –	– 36	– –	0.1315 0.1351	0.1336 0.1369	0.1356 0.1387	0.1376 0.1405	0.1396 0.1424
10	24 –	– 32	– –	0.1467 0.1575	0.1494 0.1596	0.1521 0.1616	0.1548 0.1636	0.1575 0.1656
12	24 –	– 28	– –	0.1727 0.1789	0.1754 0.1812	0.1781 0.1835	0.1808 0.1858	0.1835 0.1882
1/4	20 –	– 28	– –	0.1980 0.2129	0.2013 0.2152	0.2045 0.2175	0.2078 0.2198	0.2110 0.2222
5/16	18 –	– 24	– –	0.2548 0.2692	0.2584 0.2719	0.2620 0.2746	0.2656 0.2773	0.2692 0.2800
3/8	16 –	– 24	– –	0.3101 0.3317	0.3141 0.3344	0.3182 0.3371	0.3222 0.3398	0.3263 0.3425
7/16	14 –	– 20	– –	0.3633 0.3855	0.3679 0.3888	0.3726 0.3920	0.3772 0.3953	0.3818 0.3985
1/2	13 –	– 20	– –	0.4201 0.4480	0.4251 0.4513	0.4301 0.4545	0.4351 0.4578	0.4400 0.4610
9/16	12 –	– 18	– –	0.4759 0.5048	0.4813 0.5084	0.4867 0.5120	0.4921 0.5156	0.4976 0.5192
5/8	11 –	– 18	– –	0.5305 0.5673	0.5364 0.5709	0.5423 0.5745	0.5482 0.5781	0.5541 0.5817
3/4	10 –	– 16	– –	0.6461 0.6851	0.6526 0.6891	0.6591 0.6932	0.6656 0.6972	0.6721 0.7013
7/8	9 –	– 14	– –	0.7595 0.8008	0.7668 0.8054	0.7740 0.8101	0.7812 0.8147	0.7884 0.8193
1	8 –	– 12	– –	0.8701 0.9134	0.8782 0.9188	0.8863 0.9242	0.8945 0.9296	0.9026 0.9351
1 1/8	7 – –	– 12 –	– – 8	0.9765 1.0384 0.9951	0.9858 1.0438 1.0032	0.9951 1.0492 1.0113	1.0044 1.0546 1.0195	1.0137 1.0601 1.0276
1 1/4	7 – –	– 12 –	– – 8	1.1015 1.1634 1.1201	1.1108 1.1688 1.1282	1.1201 1.1742 1.1363	1.1294 1.1796 1.1445	1.1387 1.1851 1.1526
1 3/8	6 – –	– 12 –	– – 8	1.2018 1.2884 1.2451	1.2126 1.2938 1.2532	1.2235 1.2992 1.2613	1.2343 1.3046 1.2695	1.2451 1.3101 1.2776
1 1/2	6 – –	– 12 –	– – 8	1.3268 1.4134 1.3701	1.3376 1.4188 1.3782	1.3485 1.4242 1.3863	1.3593 1.4296 1.3945	1.3701 1.4351 1.4026
1 5/8	–	–	8	1.4951	1.5032	1.5113	1.5195	1.5276
1 3/4	5 –	– –	– 8	1.5422 1.6201	1.5551 1.6282	1.5681 1.6363	1.5811 1.6445	1.5941 1.6526
1 7/8	–	–	8	1.7451	1.7532	1.7613	1.7695	1.7776
2	4 1/2 –	– –	– 8	1.7691 1.8701	1.7835 1.8782	1.7979 1.8863	1.8124 1.8945	1.8268 1.9026
2 1/4	4 1/2 –	– –	– 8	2.0191 2.1201	2.0335 2.1282	2.0479 2.1363	2.0624 2.1445	2.0768 2.1526
2 1/2	4 –	– 12	– –	2.2402 2.3701	2.2564 2.3782	2.2727 2.3863	2.2889 2.3945	2.3051 2.4026

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Our Technical Sales department can help you decide whether cutting or forming taps are best for the internal-threading operation you will be performing. Contact us today!

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