
17. Bar diameter for external threads (for cutting type dies) 17.
unit: mm ■Unified threads (for 2A class) Unit : mm Unit : mm
major diameter of external threadsoutside diameter of external screwsbar diameter major diameter of external threads bar diameter
size pitch size
ISO old JIS(ref.) d max d min (ref.) dmax dmin
designationSize ISO old JIS
| P | dmax | dmin | T | dmax | dmin | T | No.0-80UNF | 1.511 | 1.431 | 1.45 | ||||||
| d max | d min | d maxd | d min | d | 1/ | SM 80 | 1.588 | 1.518 | 1.54 | |||||||
| 4.5 | 41.937 | 41.437 | 0.500 | 41.930 | 41.610ISO | 0.320old JIS | 1.838 | 1.743 | 1.77 | 16 |
No.1-64UNC
M30 ×2 29.962 29.682 29.940 29.640 29.8 29.7 5/ SM 64 1.984 1.904 1.92
| 4 | 41.940 | 41.465 | 0.475 | 41.940 | 41.465 | 0.475 | No.1-72UNF | 1.838 | 1.751 | 1.77 | 64 | |||||
| M42M30 ×1.53 | 29.968 29.732 29.950 29.780 41.95241.5770.37541.952 | 41.57729.8 | 0.37529.8 | No.2-56UNC | 2.169 | 2.066 | 2.09 | SM 56 | 2.381 | 2.286 | 2.31 |
3/ 32
M30 ×1 2 29.974 29.794 29.960 29.810 29.8441.96241.6820.28041.94041.640 0.300 29.85 No.2-64UNF 2.169 2.073 2.10
3/ 32 SM 100 2.381 2.306 2.32
M32 2 31.962 31.682 31.940 31.640 31.8 31.7 SM 40 3.175 3.045 3.08
| 4.5 | 44.937 | 44.437 | 0.500 | 44.930 | 44.610 | 0.320 | No.3-56UNF | 2.496 | 2.393 | 2.42 | 1/8 | ||||
| M32 ×1.5 | 31.968 31.732 31.950 31.780 | 31.8 | 31.8 | ||||||||||||
| 4 | 44.940 | 44.465 | 0.475 | 44.940 | 44.465 | 0.475 | No.4-40UNC | 2.824 | 2.695 | 2.73 | 1/8 SM 44 | 3.175 | 3.055 | 3.09 | |
| M33 ×3.53 | 32.947 32.522 32.940 32.660 44.95244.5770.37544.952 | 44.57732.6 | 0.37532.7 | 2.713 | 2.74 | ||||||||||
| M45 | No.4-48UNF | 2.827 | 3.572 | 3.442 | 3.47 |
M33 3 2 32.952 32.577 32.952 32.577 44.96244.6820.28044.940 44.64032.7 0.30032.7 No.5-40UNC 3.154 3.026 3.06
M33 2 32.962 32.682 32.962 32.682 32.8 32.8
M33 1.5 32.968 32.732 32.950 32.780 32.8 32.8 16
4 47.940 47.465 0.475 47.940 47.465 0.475 No.6-40UNF 3.484 3.356 3.39
M35 ×1.5 34.968 34.732 34.950 34.780 34.8 34.8 3/16 SM 28 4.762 4.602 4.64
| M48 | 3 | 47.952 | 47.577 | 0.375 | 47.952 | 47.577 | 0.375 | No.8-32UNC | 4.142 | 3.991 | 4.03 | |||||
| M36 ×4 | 2 | 35.940 35.465 35.930 35.630 47.96247.6820.28047.940 | 47.64035.6 | 0.30035.7 | No.8-36UNF | 4.145 | 4.006 | 4.04 | 3/ | SM 32 | 4.762 | 4.602 | 4.64 |
16
M36 ×3 1.5 35.952 35.577 35.952 35.577 47.96847.7320.23647.950 47.78035.7 0.17035.7 No.10-24UNC 4.800 4.618 4.66 7/ SM 32 5.556 5.396 5.44
32
M36 ×2 35.962 35.682 35.940 35.640 35.8 35.7 No.10-32UNF 4.803 4.651 4.69
15/64 SM 28 5.953 5.773 5.82
M36 1.5 35.968 35.732 35.950 35.780 35.8 35.8 1/ SM 24 6.350 6.170 6.22
No.12-28UNF 5.461 5.296 5.34 4
M38 ×1.5 37.968 37.732 37.950 37.780 37.8 37.8
1/4-20UNC 6.322 6.117 6.17 1/ SM 40 6.350 6.220 6.25
M39 4 38.940 38.465 38.930 38.630 38.6 38.7 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
3/8-24UNF 9.497 9.315 9.36
M40 ×3 39.952 39.577 39.952 39.577 39.7 39.7 ■ ■
| 7/16-14UNC | 11.076 | 10.816 | 10.88 | ||||
| M40 ×2 | 39.962 39.682 39.940 39.640 | 39.8 | 39.7 | 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 |
dmax dmin
M42 4.5 41.937 41.437 41.930 41.610 41.6 41.7 PT 1/ - 28 7.5 7.9 PF 1/ - 28 7.723 7.509 7.56
9/16-12UNC 14.246 13.958 14.0 16 16
M42 ×4 41.940 41.465 41.940 41.465 41.6 41.6
9/16-18UNF 14.251 14.031 14.1 PT 1/8 - 28 9.5 9.9 PF 1/8 - 28 9.728 9.514 9.57
M42 ×3 41.952 41.577 41.952 41.577 41.7 41.7
5/8-11UNC 15.834 15.528 15.6 PT 1/ - 19 12.8 13.4 PF 1/ - 19 13.157 12.907 13.0
M42 2 41.962 41.682 41.940 41.640 41.8 41.7 5/8-18UNF 15.839 15.619 15.7
PT 3/8 - 19 16.3 16.9 PF 3/8 - 19 16.662 16.412 16.5
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
7/8-9UNC 22.176 21.824 21.9 PT 3/ - 14 25.9 26.8 PF 5/ - 14 22.911 22.627 22.7
M45 ×4 44.940 44.465 44.940 44.465 44.6 44.6 4 8
7/8-14UNF 22.184 21.923 22.0
M45 ×3 44.952 44.577 44.952 44.577 44.7 44.7 25.349 24.969 25.1 PT 1 - 11 32.7 33.7 PF 3/4 - 14 26.441 26.157 26.2
1-8UNC
| M45 ×2 | 44.962 44.682 44.940 44.640 | 44.8 | 44.7 | 1-12UNF | 25.354 | 25.065 | 25.1 | PT 1 1/4 - 11 | 41.2 | 42.3 | PF | 7/8 - 14 | 30.201 | 29.917 | 30.0 | |
| 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 | PT 1 1/ | - 11 | 47.1 | 48.2 | PF | 1 - 11 | 33.249 | 32.889 | 33.0 |
2
M48 5 47.929 47.399 47.930 47.590 47.5 47.7 PT 2 - 11 58.7 60.1 PF 1 1/ - 11 37.897 37.537 37.6
1 1/4-7UNC 31.694 31.278 31.4 8
M48 ×4 47.940 47.465 47.940 47.465 47.6 47.6
| 1 1/4-12UNF | 31.704 | 31.415 | 31.5 | PF 1 1/4 - 11 | 41.910 | 41.550 | 41.6 | ||||
| M48 ×3 | 47.952 47.577 47.952 47.577 | 47.7 | 47.7 | 1 3/8-6UNC | 34.864 | 34.402 | 34.5 | ||||
| PF 1 1/2 - 11 | 47.803 | 47.443 | 47.5 | ||||||||
| M48 ×2 | 47.962 47.682 47.940 47.640 | 47.8 | 47.7 | 1 3/8-12UNF | 34.876 | 34.588 | 34.7 | ||||
| 1 1/2-6UNC | 38.039 | 37.577 | 37.7 | PF | 2 - 11 59.614 | 59.254 | 59.3 | ||||
| M48 ×1.5 | 47.968 47.732 47.950 47.780 | 47.8 | 47.8 | ||||||||
| 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