JIC tube fittings Union Size Chart

Jun 09, 2019

JIC tube fittings size is according to SAE J514 and ISO 8434-4 standards, it is connection from tube to tube.

Union size chart types of hydraulic flare fittings including straight fittings(S), elbow fittings(E), tee fittings(T) and cross fittings(K).  

Dimensions of JIC tube union connectors

Dimensions in millimetres Thread  c d d 1 L 4 L 5 S 2 S 3 Forged connector Connector machined from bar stock Ordering size code  a Tube OD  b ref.  ± 0,8  ± 1  nom.  tol.  max.

6 × 6  6  7/16-20 UNF  4,4  35  22,5  12  12  +0/-0,8  14

8 × 8  8  1/2-20 UNF  6  35  24  14  14  +0/-0,8  17

10 × 10  10  9/16-18 UNF  7,5  36  27  17  14  +0/-0,8  22

12 × 12  12  3/4-16 UNF  9,9  41  32  22  19  +0/-0,8  22

16 × 16  16  7/8-14 UNF  12,3  48  37  24  22  +0/-0,8  32

20 × 20  20  1 1/16-12 UN  15,5  55  42  30  27  +0/-1,0  36

25 × 25  25  1 5/16-12 UN  21,5  57  46  36  32  +0/-1,0  41

32 × 32  32  1 5/8-12 UN  27,5  61,5  52,5  46  41  +0/-1,0  55

38 × 38  38  1 7/8-12 UN  33,5  70  59  50  50  +0/-1,0  60

50 × 50  50  2 1/2-12 UN  45  86,5  77,5  65  65  +0/-1,0  80

a Code given is for straights and elbows. Add third and fourth sizes for tees and crosses using left, right, up-and-down sequence omitting ends when not present.

b See Table 1 for corresponding inch sizes.

c In accordance with ISO 263, ISO 68-2 and ISO 5864.