Straight type union tube fittings ligh series size chart as follows:
PART NO. THREAD TUBE O.D. E F D1 D2
1C-12 M12X1.5 M12X1.5 6 6
1C-14 M14X1.5 M14X1.5 8 8
1C-16 M16X1.5 M16X1.5 10 10
1C-18 M18X1.5 M18X1.5 12 12
1C-22 M22X1.5 M22X1.5 15 15
1C-26 M26X1.5 M26X1.5 18 18
1C-30 M30X2 M30X2 22 22
1C-36 M36X2 M36X2 28 28
1C-45 M45X2 M45X2 35 35
1C-52 M52X2 M52X2 42 42
High pressure fitting series size as follow
1D-14 M14X1.5 M14X1.5 6 6
1D-16 M16X1.5 M16X1.5 8 8
1D-18 M18X1.5 M18X1.5 10 10
1D-20 M20X1.5 M20X1.5 12 12
1D-22 M22X1.5 M22X1.5 14 14
1D-24 M24X1.5 M24X1.5 16 16
1D-30 M30X2 M30X2 20 20
1D-36 M36X2 M36X2 25 25
1D-42 M42X2 M42X2 30 30
1D-52 M52X2 M52X2 38 38