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Refrigeration Tube Fittings - Internal Flare Union

SAE J 513 (010107-U4) - 2019

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Tube outer diameter

3/16

1/4

5/16

3/8

1/2

5/8

3/4

d	（UN）
C₃
D₅	mm
	in.
I₁	mm
	in.
J₁	mm	min
	in.	min
L₆	mm	Nominal Size
		max
		min
	in.	Nominal Size
		max
		min
T₁	mm	min
	in.	min
U	mm	max
		min
	in.	max
		min
X	mm	max
		min
	in.	max
		min

3/8 -24	7/16 -20	1/2 -20	5/8 -18	3/4 -16	7/8 -14	1-1/16 -14
1/2	5/8	11/16	13/16	15/16	1-1/16	1-5/16
4.78	6.35	7.92	9.52	12.7	15.88	19.05
0.188	0.25	0.312	0.375	0.5	0.625	0.75
7.1	8.6	9.7	11.2	13.5	16.8	19.8
0.28	0.34	0.38	U	0.53	0.66	0.78
5.3	6.6	7.6	8.6	5.4	13.7	16.8
0.21	0.26	0.3	0.34	0.43	0.54	0.66
22.4	25.4	26.9	31.8	36.6	42.9	50.8
23.2	26.2	27.7	32.6	37.4	43.7	51.6
21.6	24.6	26.1	31	35.8	42.1	50
0.88	1	1.06	1.25	1.44	1.69	2
0.91	1.03	1.09	1.28	1.47	1.72	2.03
0.85	0.97	1.03	1.22	1.41	1.66	1.97
5.3	6.1	6.1	7.6	9.4	10.9	12.4
0.21	0.24	0.24	0.3	0.37	0.43	0.49
10.4	11.9	13.5	17	20.3	23.6	28.2
9.9	11.4	13	16.3	19.6	22.9	27.4
0.41	0.47	0.53	0.67	0.8	0.93	1.11
0.39	0.45	0.51	0.64	0.77	0.9	1.08
12.7	15.7	17.5	20.6	23.9	26.9	33.3
12.2	15.2	17	20.1	23.4	26.4	32.8
0.5	0.62	0.69	0.81	0.94	1.06	1.31
0.48	0.6	0.67	0.79	0.92	1.04	1.29

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