17. 17. Bar diameter of external threads (for thread rolling dies)

NRS-D recommendation for bar diameter

■ for metric external threads

Unit : mm

sizerecommended bar diameter
Max. Min.
M3×0.52.64 2.62
M4×0.73.54 3.52
M5×0.84.40 4.38
M6×15.30 5.28
M8×1.257.10 7.07

d max d min dmax dmin

P dmax dmin T dmax dmin T No.0-80UNF 1.511 1.431 1.45

241.96241.6820.28041.94041.6400.300No.2-64UNF2.1692.0732.10SM 1002.3812.3062.32
1.541.96841.7320.23641.95041.7800.170No.3-48UNC2.4962.3832.41
444.94044.4650.47544.94044.4650.475No.4-40UNC2.8242.6952.731/8 SM 443.1753.0553.09
M45 344.95244.5770.37544.95244.5770.375No.4-48UNF2.8272.7132.743.5723.4423.47
9/64 SM 40
244.96244.6820.28044.94044.6400.300No.5-40UNC3.1543.0263.06
1.544.96844.7320.23644.95044.7800.170No.5-44UNF3.1573.0363.0711/64 SM 404.3664.2364.27
RS-D recommendation for bar diameter for metric external threads
547.92947.3990.53047.93047.5900.340No.6-32UNC3.4843.3333.373/SM 244.7624.602Unit : mm 4.64

16

sizerecommended bar diameter
Max.Min.
M2.3×0.41.9981.968
M2.3×0.252.0962.071
M2.5×0.452.1622.126
M2.5×0.352.2282.196
M2.6×0.452.2622.226
M2.6×0.352.3182.278
M3×0.52.6272.589
M3×0.352.7182.677
M4×0.53.6073.561
M5×0.54.6064.560
sizerecommendedbar diameter
Max.Min.
M1×0.250.8080.785
M1.1×0.250.9180.891
M1.2×0.251.0070.984
M1.4×0.31.1681.142
M1.6×0.351.3321.300
M1.7×0.351.4321.401
M1.8×0.351.5301.498
M2×0.41.6991.669
M2×0.251.7961.771
M2.2×0.451.8631.827
1.547.96847.7320.23647.95047.7800.170No.10-24UNC4.8004.6184.667/SM 325.5565.3965.44
No.12-28UNF5.4615.2965.341/4 SM 246.3506.1706.22
1/4-20UNC6.3226.1176.171/SM 406.3506.2206.25
3/8-16UNC9.4919.2549.31
3/8-24UNF9.4979.3159.36
1/2-13UNC12.61112.38612.4
dmaxdmin
1/2-20UNF12.66612.46212.5

PT 1/16 - 28 7.5 7.9 PF 1/16 - 28 7.723 7.509 7.56

9/16-12UNC 14.246 13.958 14.0

9/16-18UNF14.25114.03114.1PT1/8 - 289.59.9PF1/8 - 289.7289.5149.57
5/8-11UNC15.83415.52815.6MS-RS-D recommendation for bar diameter
PT1/4 - 1912.813.4PF1/4 - 1913.15712.90713.0for miniature external threads
5/8-18UNF15.83915.61915.7Unit : mm
3/4-10UNC19.00418.67718.8PT3/8 - 1916.316.9PF3/8 - 1916.66216.41216.5
sizerecommended bar diameter
Max. Min.
S0.5×0.1250.410 0.396
S0.6×0.150.494 0.479
S0.7×0.1750.575 0.559
S0.8×0.20.658 0.640
S0.9×0.2250.741 0.720
1 1/8-7UNC28.51928.10328.248.2 47.1 - 11 PT 1 1/ PF1 - 1133.24932.88933.0
1 1/8-12UNF28.52928.24028.3
1 1/4-12UNF31.70431.41531.5PF 1 1/4 - 1141.91041.55041.6
1 3/8-6UNC34.86434.40234.5PF 1 1/- 1147.80347.44347.5
2
1 3/8-12UNF34.87634.58834.7
1 1/2-6UNC38.03937.57737.7PF2 - 1159.61459.25459.3
1 1/2-12UNF38.05137.76337.8
1 3/4-5UNC44.38143.86144.0
2-4.5UNC50.72650.16850.3