17. Bar diameter for external threads (for cutting type dies) Unuinti:t:mmmm ■Unified threads (for 2A class) Unit : mm Production data pitch major diamouetseirdoefdeiaxmteerntearl othf reexatedrsnal scrbewarsdiameter size major diameter of external threads bar diameter size ISO old JIS(ref.) d max d min (ref.) designatioSnize ISO old JIS P ddmmaaxx dd mmiinn d Tmdax ddmmainx dImSOin oTlddJIS No.0-80UNF 1.511 1.431 1.45 M30 ×2 4.5 2491..996327 2491..648327 209..590400 4219..963400 412.691.80 0.2392.07 No.1-64UNC 1.838 1.743 1.77 4 41.940 41.465 0.475 41.940 41.465 0.475 No.1-72UNF 1.838 1.751 1.77 M4M230 ×1.53 2491..996582 2491..753727 209..397550 4219..975820 412.597.87 0.2397.58 No.2-56UNC 2.169 2.066 2.09 M30 ×1 2 2491..997642 2491..769842 209..298600 4219..984100 412.694.804 0.2390.085 No.2-64UNF 2.169 2.073 2.10 M32 ×2 1.5 3411..996628 3411..678322 301..293460 4311..965400 413.718.80 0.3117.07 No.3-48UNC 2.496 2.383 2.41 M32 ×1.54.5 3414..996387 3414..743327 301..590500 4341..973800 443.611.80 0.3312.08 No.3-56UNF 2.496 2.393 2.42 M4M533 ×3.543 344244...999445702 344244...545267257 3002...439774550 443442...996456020 44443..45267.657 00..343277.557 No.4-40UNC 2.824 2.695 2.73 M33 ×3 3424..995622 3424..567872 302..298502 4342..954707 443.624.70 0.3320.07 No.4-48UNF 2.827 2.713 2.74 2 No.5-40UNC 3.154 3.026 3.06 M33 ×2 1.5 3424..996628 3424..678322 302..293662 4342..965802 443.728.80 0.3127.08 No.5-44UNF 3.157 3.036 3.07 M33 ×1.55 3427..996289 3427..733929 302..593500 4372..973800 473.529.80 0.3324.08 No.6-32UNC 3.484 3.333 3.37 M35 ×1.54 3447..996480 3447..743625 304..497550 4374..974800 473.446.85 0.3447.58 No.6-40UNF 3.484 3.356 3.39 M4M836 ×4 3 47.952 47.577 0.375 47.952 47.577 0.375 No.8-32UNC 4.142 3.991 4.03 3457..994602 3457..466852 305..298300 4375..964300 473.654.60 0.3350.07 2 No.8-36UNF 4.145 4.006 4.04 M36 ×3 1.5 3457..995628 3457..577372 305..293562 4375..955707 473.758.70 0.3157.07 No.10-24UNC 4.800 4.618 4.66 M36 ×2 35.962 35.682 35.940 35.640 35.8 35.7 No.10-32UNF 4.803 4.651 4.69 M36 ×1.5 35.968 35.732 35.950 35.780 35.8 35.8 No.12-24UNC 5.461 5.279 5.32 M38 ×1.5 37.968 37.732 37.950 37.780 37.8 37.8 No.12-28UNF 5.461 5.296 5.34 M39 ×4 38.940 38.465 38.930 38.630 38.6 38.7 1/4-20UNC 6.322 6.117 6.17 1/4-28UNF 6.324 6.160 6.20 M39 ×3 38.952 38.577 38.952 38.577 38.7 38.7 5/16-18UNC 7.907 7.687 7.74 M39 ×2 38.962 38.682 38.962 38.682 38.8 38.8 5/16-24UNF 7.909 7.727 7.77 M39 ×1.5 38.968 38.732 38.968 38.732 38.8 38.8 3/8-16UNC 9.491 9.254 9.31 M40 ×3 39.952 39.577 39.952 39.577 39.7 39.7 3/8-24UNF 9.497 9.315 9.36 M40 ×2 39.962 39.682 39.940 39.640 39.8 39.7 7/16-14UNC 11.076 10.816 10.88 7/16-20UNF 11.079 10.874 10.93 M40 ×1.5 39.968 39.732 39.950 39.780 39.8 39.8 1/2-13UNC 12.611 12.386 12.4 M42 ×4.5 41.937 41.437 41.930 41.610 41.6 41.7 1/2-20UNF 12.666 12.462 12.5 M42 ×4 41.940 41.465 41.940 41.465 41.6 41.6 9/16-12UNC 14.246 13.958 14.0 M42 ×3 41.952 41.577 41.952 41.577 41.7 41.7 9/16-18UNF 14.251 14.031 14.1 M42 ×2 41.962 41.682 41.940 41.640 41.8 41.7 5/8-11UNC 15.834 15.528 15.6 5/8-18UNF 15.839 15.619 15.7 M42 ×1.5 41.968 41.732 41.950 41.780 41.8 41.8 3/4-10UNC 19.004 18.677 18.8 M45 ×4.5 44.937 44.437 44.930 44.610 44.6 44.7 3/4-16UNF 19.011 18.774 18.8 M45 ×4 44.940 44.465 44.940 44.465 44.6 44.6 7/8-9UNC 22.176 21.824 21.9 M45 ×3 44.952 44.577 44.952 44.577 44.7 44.7 7/8-14UNF 22.184 21.923 22.0 1-8UNC 25.349 24.969 25.1 M45 ×2 44.962 44.682 44.940 44.640 44.8 44.7 1-12UNF 25.354 25.065 25.1 M45 ×1.5 44.968 44.732 44.950 44.780 44.8 44.8 1 1/8-7UNC 28.519 28.103 28.2 M48 ×5 47.929 47.399 47.930 47.590 47.5 47.7 1 1/8-12UNF 28.529 28.240 28.3 M48 ×4 47.940 47.465 47.940 47.465 47.6 47.6 1 1/4-7UNC 31.694 31.278 31.4 M48 ×3 47.952 47.577 47.952 47.577 47.7 47.7 1 1/4-12UNF 31.704 31.415 31.5 1 3/8-6UNC 34.864 34.402 34.5 M48 ×2 47.962 47.682 47.940 47.640 47.8 47.7 1 3/8-12UNF 34.876 34.588 34.7 M48 ×1.5 47.968 47.732 47.950 47.780 47.8 47.8 1 1/2-6UNC 38.039 37.577 37.7 1 1/2-12UNF 38.051 37.763 37.8 1 3/4-5UNC 44.381 43.861 44.0 2-4.5UNC 50.726 50.168 50.3 ・from table 4 JIS B 0210 and table 4 JIS B 0212 Information Technical Technical-48 819