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

PdmaxdminTdmaxdminTNo.0-80UNF1.5111.4311.45
d maxd mind maxdd mind1/SM 801.5881.5181.54
4.541.93741.4370.50041.93041.610ISO0.320old JIS1.8381.7431.7716

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

441.94041.4650.47541.94041.4650.475No.1-72UNF1.8381.7511.7764
M42M30 ×1.5329.968 29.732 29.950 29.780 41.95241.5770.37541.95241.57729.80.37529.8No.2-56UNC2.1692.0662.09SM 562.3812.2862.31

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

  • 1.5 41.968 41.732 0.236 41.950 41.780 0.170 No.3-48UNC 2.496 2.383 2.41

M32 2 31.962 31.682 31.940 31.640 31.8 31.7 SM 40 3.175 3.045 3.08

4.544.93744.4370.50044.93044.6100.320No.3-56UNF2.4962.3932.421/8
M32 ×1.531.968 31.732 31.950 31.78031.831.8
444.94044.4650.47544.94044.4650.475No.4-40UNC2.8242.6952.731/8 SM 443.1753.0553.09
M33 ×3.5332.947 32.522 32.940 32.660 44.95244.5770.37544.95244.57732.60.37532.72.7132.74
M45No.4-48UNF2.8273.5723.4423.47
  • 9/64 SM 40

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

  • 1.5 44.968 44.732 0.236 44.950 44.780 0.170 No.5-44UNF 3.157 3.036 3.07 11/64 SM 40 4.366 4.236 4.27

M33 2 32.962 32.682 32.962 32.682 32.8 32.8

  • 5 47.929 47.399 0.530 47.930 47.590 0.340 No.6-32UNC 3.484 3.333 3.37 3/ SM 24 4.762 4.602 4.64

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

M48347.95247.5770.37547.95247.5770.375No.8-32UNC4.1423.9914.03
M36 ×4235.940 35.465 35.930 35.630 47.96247.6820.28047.94047.64035.60.30035.7No.8-36UNF4.1454.0064.043/SM 324.7624.6024.64

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

  • No.12-24UNC 5.461 5.279 5.32

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

  • 4

M39 4 38.940 38.465 38.930 38.630 38.6 38.7 1/4-28UNF 6.324 6.160 6.20

M39 ×338.952 38.577 38.952 38.57738.738.75/16-18UNC7.9077.6877.74
M39 ×238.962 38.682 38.962 38.68238.838.85/16-24UNF7.9097.7277.77
  • 3/8-16UNC 9.491 9.254 9.31

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 ■ ■

7/16-14UNC11.07610.81610.88
M40 ×239.962 39.682 39.940 39.64039.839.77/16-20UNF11.07910.87410.93
M40 ×1.539.968 39.732 39.950 39.78039.839.81/2-13UNC12.61112.38612.4

dmax dmin

  • 1/2-20UNF 12.666 12.462 12.5

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

  • 4 4

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

  • 3/4-16UNF 19.011 18.774 18.8 PT 1/2 - 14 20.5 21.3 PF 1/2 - 14 20.955 20.671 20.7

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 ×244.962 44.682 44.940 44.64044.844.71-12UNF25.35425.06525.1PT 1 1/4 - 1141.242.3PF7/8 - 1430.20129.91730.0
M45 ×1.544.968 44.732 44.950 44.78044.844.81 1/8-7UNC28.51928.10328.2PT 1 1/- 1147.148.2PF1 - 1133.24932.88933.0

2

  • 1 1/8-12UNF 28.529 28.240 28.3

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 1/4-12UNF31.70431.41531.5PF 1 1/4 - 1141.91041.55041.6
M48 ×347.952 47.577 47.952 47.57747.747.71 3/8-6UNC34.86434.40234.5
PF 1 1/2 - 1147.80347.44347.5
M48 ×247.962 47.682 47.940 47.64047.847.71 3/8-12UNF34.87634.58834.7
1 1/2-6UNC38.03937.57737.7PF2 - 11 59.61459.25459.3
M48 ×1.547.968 47.732 47.950 47.78047.847.8
1 1/2-12UNF38.05137.76337.8
1 3/4-5UNC44.38143.86144.0
2-4.5UNC50.72650.16850.3

・from table 4 JIS B 0210 and table 4 JIS B 0212