■ Unified threads (for 2A class)

Unit:mm

SizeOutside diameter Max.of external thread Min.Bar diameter
No.0-80UNF1.5111.4311.45
No.1-64UNC1.8381.7431.77
No.1-72UNF1.8381.7511.77
No.2-56UNC2.1692.0662.09
No.2-64UNF2.1692.0732.10
No.3-48UNC2.4962.3832.41
No.3-56UNF2.4962.3932.42
No.4-40UNC2.8242.6952.73
No.4-48UNF2.8272.7132.74
No.5-40UNC3.1543.0263.06
No.5-44UNF3.1573.0363.07
No.6-32UNC3.4843.3333.37
No.6-40UNF3.4843.3563.39
No.8-32UNC4.1423.9914.03
No.8-36UNF4.1454.0064.04
No.10-24UNC4.8004.6184.66
No.10-32UNF4.8034.6514.69
No.12-24UNC5.4615.2795.32
No.12-28UNF5.4615.2965.34
1/4-20UNC6.3226.1176.17
1/4-28UNF6.3246.1606.20
1/4-32UNEF6.3246.1736.21
5/16-18UNC7.9077.6877.74
5/16-24UNF7.9097.7277.77
5/16-32UNEF7.9127.7607.80
3/8-16UNC9.4919.2549.31
3/8-24UNF9.4979.3159.36
3/8-32UNEF9.4999.3489.39
7/16-14UNC11.07610.81610.9
7/16-20UNF11.07910.87410.93
7/16-24UNS11.08210.90010.95
7/16-28UNEF11.08410.92010.96
1/2-13UNC12.66112.38612.5
1/2-20UNF12.66612.46212.51
1/2-28UNEF12.67212.50712.55
9/16-12UNC14.24613.95814.0
9/16-18UNF14.25114.03114.09
9/16-20UN14.25414.04914.10
9/16-24UNEF14.25714.07514.12
5/8-11UNC15.83415.52815.6
5/8-18UNF15.83915.61915.67
5/8-24UNEF15.84415.66215.71
3/4-10UNC19.00418.67718.8
3/4-16UNF19.01118.77418.83
3/4-20UNEF19.01718.81218.86
7/8-9UNC22.17621.82421.9
7/8-14UNF22.18421.92322.0
1 -8UNC25.34924.96925.1
1 -12UNF25.35425.06525.1
1 -14UNS25.35925.09825.2
1 -20UNEF25.36425.15925.21
1 1/8-7UNC 1 1/8-8UN28.519 28.52128.103 28.14128.2 28.2
Outside diameterof external thread
zeMax.Min.ar ameer
1 1/8-12UNF28.52928.24028.3
1 1/4-7UNC31.69431.27831.4
1 1/4-8UN31.69631.31631.4
1 1/4-12UNF31.70431.41531.5
1 3/8-6UNC34.86434.40234.5
1 3/8-12UNF34.87634.58834.7
1 1/2-6UNC38.03937.57737.7
1 1/2-8UN38.04437.66437.8
1 1/2-12UNF38.05137.76337.8
1 5/8-12UN41.22940.94041.0
1 3/4-5UNC44.38143.86144.0
1 3/4-12UN44.40444.11544.2
2 -12UN50.75450.46550.5