Description of productsTechnical Information 17. Bar diameter for external threads (for cutting type dies) ■ Unified threads (for 2A class) Unit:mm Outside diameter of external thread Outside diameter of external thread Size Bar diameter Size Bar diameter Max. Min. Max. Min. No.0-80UNF 1.511 1.431 1.45 1 1/8-12UNF 28.529 28.240 28.3 No.1-64UNC 1.838 1.743 1.77 1 1/4-7UNC 31.694 31.278 31.4 No.1-72UNF 1.838 1.751 1.77 1 1/4-8UN 31.696 31.316 31.4 No.2-56UNC 2.169 2.066 2.09 1 1/4-12UNF 31.704 31.415 31.5 No.2-64UNF 2.169 2.073 2.10 1 3/8-6UNC 34.864 34.402 34.5 No.3-48UNC 2.496 2.383 2.41 1 3/8-12UNF 34.876 34.588 34.7 No.3-56UNF 2.496 2.393 2.42 1 1/2-6UNC 38.039 37.577 37.7 No.4-40UNC 2.824 2.695 2.73 1 1/2-8UN 38.044 37.664 37.8 No.4-48UNF 2.827 2.713 2.74 1 1/2-12UNF 38.051 37.763 37.8 No.5-40UNC 3.154 3.026 3.06 1 5/8-12UN 41.229 40.940 41.0 No.5-44UNF 3.157 3.036 3.07 1 3/4-5UNC 44.381 43.861 44.0 No.6-32UNC 3.484 3.333 3.37 1 3/4-12UN 44.404 44.115 44.2 No.6-40UNF 3.484 3.356 3.39 2 -12UN 50.754 50.465 50.5 No.8-32UNC 4.142 3.991 4.03 · UNC, UNF: JIS B 0210 and JIS B 0212 No.8-36UNF 4.145 4.006 4.04 · UNEF, UN, UNS: ASME B1.1 No.10-24UNC 4.800 4.618 4.66 No.10-32UNF 4.803 4.651 4.69 No.12-24UNC 5.461 5.279 5.32 No.12-28UNF 5.461 5.296 5.34 1/4-20UNC 6.322 6.117 6.17 1/4-28UNF 6.324 6.160 6.20 1/4-32UNEF 6.324 6.173 6.21 5/16-18UNC 7.907 7.687 7.74 5/16-24UNF 7.909 7.727 7.77 5/16-32UNEF 7.912 7.760 7.80 3/8-16UNC 9.491 9.254 9.31 3/8-24UNF 9.497 9.315 9.36 3/8-32UNEF 9.499 9.348 9.39 7/16-14UNC 11.076 10.816 10.9 7/16-20UNF 11.079 10.874 10.93 7/16-24UNS 11.082 10.900 10.95 7/16-28UNEF 11.084 10.920 10.96 1/2-13UNC 12.661 12.386 12.5 1/2-20UNF 12.666 12.462 12.51 1/2-28UNEF 12.672 12.507 12.55 9/16-12UNC 14.246 13.958 14.0 9/16-18UNF 14.251 14.031 14.09 9/16-20UN 14.254 14.049 14.10 9/16-24UNEF 14.257 14.075 14.12 5/8-11UNC 15.834 15.528 15.6 5/8-18UNF 15.839 15.619 15.67 5/8-24UNEF 15.844 15.662 15.71 3/4-10UNC 19.004 18.677 18.8 3/4-16UNF 19.011 18.774 18.83 3/4-20UNEF 19.017 18.812 18.86 7/8-9UNC 22.176 21.824 21.9 7/8-14UNF 22.184 21.923 22.0 1 -8UNC 25.349 24.969 25.1 1 -12UNF 25.354 25.065 25.1 1 -14UNS 25.359 25.098 25.2 1 -20UNEF 25.364 25.159 25.21 1 1/8-7UNC 28.519 28.103 28.2 1 1/8-8UN 28.521 28.141 28.2 Technical-54