Reducing Union

Imperial Tube OD x Imperial Tube OD

Reducing unions are used to connect two fractional tubes of different sizes in instrumentation and process piping systems.

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Technical Drawing

Tube Fitting Product

Short Product Description

Reducing unions are used to connect two fractional tubes of different sizes in instrumentation and process piping systems.

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Reducing Tube Connection

Connects two fractional tube runs of different sizes.

Inline Coupling

Supports straight tube routing in instrumentation layouts.

Instrumentation Duty

Designed for clean routing and dependable installation in instrument and process piping systems.

Imperial Sizes

Reducing Union Size Chart

Showing 23 of 23 sizes - 0 selected

Part No.	Tube OD (T) inch	Tube OD (Tx) inch	A	C	CX	D	DX	E	F Hex	G	GX	H
2RU1	1/8	1/16	1.22	0.60	0.43	0.50	0.34	0.05	7/16	7/16	5/16	0.81
3RU1	3/16	1/16	1.27	0.63	0.43	0.54	0.34	0.05	7/16	7/16	5/16	0.86
3RU2	3/16	1/8	1.44	0.63	0.60	0.54	0.50	0.09	7/16	7/16	7/16	0.92
4RU1	1/4	1/16	1.35	0.70	0.43	0.60	0.34	0.05	7/16	9/16	5/16	0.91
4RU2	1/4	1/8	1.52	0.70	0.60	0.60	0.50	0.09	7/16	9/16	7/16	0.97
4RU3	1/4	3/16	1.55	0.70	0.63	0.60	0.54	0.12	7/16	9/16	1/2	1
5RU2	5/16	1/8	1.56	0.73	0.60	0.64	0.50	0.09	9/16	5/8	7/16	1.01
5RU4	5/16	1/4	1.66	0.73	0.70	0.64	0.60	0.19	9/16	5/8	9/16	1.08
6RU1	3/8	1/16	1.44	0.76	0.43	0.66	0.34	0.05	5/8	11/16	5/16	1
6RU2	3/8	1/8	1.61	0.76	0.60	0.66	0.50	0.09	5/8	11/16	7/16	1.06
6RU4	3/8	1/4	1.70	0.76	0.70	0.66	0.60	0.19	5/8	11/16	9/16	1.12
6RU5	3/8	5/16	1.74	0.76	0.73	0.66	0.64	0.25	5/8	11/16	5/8	1.16
8RU2	1/2	1/8	1.78	0.86	0.60	0.90	0.50	0.09	7/8	7/8	7/16	1.12
8RU4	1/2	1/4	1.85	0.86	0.70	0.90	0.60	0.19	7/8	7/8	9/16	1.16
8RU6	1/2	3/8	1.91	0.86	0.76	0.90	0.66	0.28	7/8	7/8	11/16	1.22
10RU6	5/8	3/8	1.94	0.86	0.76	0.96	0.66	0.28	1	1	11/16	1.25
10RU8	5/8	1/2	2.05	0.86	0.86	0.96	0.90	0.41	1	1	7/8	1.25
12RU4	3/4	1/4	1.94	0.86	0.70	0.96	0.60	0.19	1-1/8	1-1/8	9/16	1.25
12RU6	3/4	3/8	2.00	0.86	0.76	0.96	0.66	0.28	1-1/8	1-1/8	11/16	1.31
12RU8	3/4	1/2	2.11	0.86	0.86	0.96	0.90	0.41	1-1/8	1-1/8	7/8	1.31
12RU10	3/4	5/8	2.11	0.86	0.86	0.96	0.96	0.50	1-1/8	1-1/8	1	1.31
16RU8	1	1/2	2.38	1.04	0.86	1.23	0.90	0.41	1-1/2	1-1/2	7/8	1.5
16RU12	1	3/4	2.38	1.04	0.86	1.23	0.96	0.62	1-1/2	1-1/2	1-1/8	1.5

2RU1

Tube OD 1/8, Thread Tube OD Tx 1/16

A: 1.22
C: 0.60
CX: 0.43
D: 0.50
DX: 0.34
E: 0.05
F Hex: 7/16
G: 7/16
GX: 5/16
H: 0.81

3RU1

Tube OD 3/16, Thread Tube OD Tx 1/16

A: 1.27
C: 0.63
CX: 0.43
D: 0.54
DX: 0.34
E: 0.05
F Hex: 7/16
G: 7/16
GX: 5/16
H: 0.86

3RU2

Tube OD 3/16, Thread Tube OD Tx 1/8

A: 1.44
C: 0.63
CX: 0.60
D: 0.54
DX: 0.50
E: 0.09
F Hex: 7/16
G: 7/16
GX: 7/16
H: 0.92

4RU1

Tube OD 1/4, Thread Tube OD Tx 1/16

A: 1.35
C: 0.70
CX: 0.43
D: 0.60
DX: 0.34
E: 0.05
F Hex: 7/16
G: 9/16
GX: 5/16
H: 0.91

4RU2

Tube OD 1/4, Thread Tube OD Tx 1/8

A: 1.52
C: 0.70
CX: 0.60
D: 0.60
DX: 0.50
E: 0.09
F Hex: 7/16
G: 9/16
GX: 7/16
H: 0.97

4RU3

Tube OD 1/4, Thread Tube OD Tx 3/16

A: 1.55
C: 0.70
CX: 0.63
D: 0.60
DX: 0.54
E: 0.12
F Hex: 7/16
G: 9/16
GX: 1/2
H: 1

5RU2

Tube OD 5/16, Thread Tube OD Tx 1/8

A: 1.56
C: 0.73
CX: 0.60
D: 0.64
DX: 0.50
E: 0.09
F Hex: 9/16
G: 5/8
GX: 7/16
H: 1.01

5RU4

Tube OD 5/16, Thread Tube OD Tx 1/4

A: 1.66
C: 0.73
CX: 0.70
D: 0.64
DX: 0.60
E: 0.19
F Hex: 9/16
G: 5/8
GX: 9/16
H: 1.08

6RU1

Tube OD 3/8, Thread Tube OD Tx 1/16

A: 1.44
C: 0.76
CX: 0.43
D: 0.66
DX: 0.34
E: 0.05
F Hex: 5/8
G: 11/16
GX: 5/16
H: 1

6RU2

Tube OD 3/8, Thread Tube OD Tx 1/8

A: 1.61
C: 0.76
CX: 0.60
D: 0.66
DX: 0.50
E: 0.09
F Hex: 5/8
G: 11/16
GX: 7/16
H: 1.06

6RU4

Tube OD 3/8, Thread Tube OD Tx 1/4

A: 1.70
C: 0.76
CX: 0.70
D: 0.66
DX: 0.60
E: 0.19
F Hex: 5/8
G: 11/16
GX: 9/16
H: 1.12

6RU5

Tube OD 3/8, Thread Tube OD Tx 5/16

A: 1.74
C: 0.76
CX: 0.73
D: 0.66
DX: 0.64
E: 0.25
F Hex: 5/8
G: 11/16
GX: 5/8
H: 1.16

8RU2

Tube OD 1/2, Thread Tube OD Tx 1/8

A: 1.78
C: 0.86
CX: 0.60
D: 0.90
DX: 0.50
E: 0.09
F Hex: 7/8
G: 7/8
GX: 7/16
H: 1.12

8RU4

Tube OD 1/2, Thread Tube OD Tx 1/4

A: 1.85
C: 0.86
CX: 0.70
D: 0.90
DX: 0.60
E: 0.19
F Hex: 7/8
G: 7/8
GX: 9/16
H: 1.16

8RU6

Tube OD 1/2, Thread Tube OD Tx 3/8

A: 1.91
C: 0.86
CX: 0.76
D: 0.90
DX: 0.66
E: 0.28
F Hex: 7/8
G: 7/8
GX: 11/16
H: 1.22

10RU6

Tube OD 5/8, Thread Tube OD Tx 3/8

A: 1.94
C: 0.86
CX: 0.76
D: 0.96
DX: 0.66
E: 0.28
F Hex: 1
G: 1
GX: 11/16
H: 1.25

10RU8

Tube OD 5/8, Thread Tube OD Tx 1/2

A: 2.05
C: 0.86
CX: 0.86
D: 0.96
DX: 0.90
E: 0.41
F Hex: 1
G: 1
GX: 7/8
H: 1.25

12RU4

Tube OD 3/4, Thread Tube OD Tx 1/4

A: 1.94
C: 0.86
CX: 0.70
D: 0.96
DX: 0.60
E: 0.19
F Hex: 1-1/8
G: 1-1/8
GX: 9/16
H: 1.25

12RU6

Tube OD 3/4, Thread Tube OD Tx 3/8

A: 2.00
C: 0.86
CX: 0.76
D: 0.96
DX: 0.66
E: 0.28
F Hex: 1-1/8
G: 1-1/8
GX: 11/16
H: 1.31

12RU8

Tube OD 3/4, Thread Tube OD Tx 1/2

A: 2.11
C: 0.86
CX: 0.86
D: 0.96
DX: 0.90
E: 0.41
F Hex: 1-1/8
G: 1-1/8
GX: 7/8
H: 1.31

12RU10

Tube OD 3/4, Thread Tube OD Tx 5/8

A: 2.11
C: 0.86
CX: 0.86
D: 0.96
DX: 0.96
E: 0.50
F Hex: 1-1/8
G: 1-1/8
GX: 1
H: 1.31

16RU8

Tube OD 1, Thread Tube OD Tx 1/2

A: 2.38
C: 1.04
CX: 0.86
D: 1.23
DX: 0.90
E: 0.41
F Hex: 1-1/2
G: 1-1/2
GX: 7/8
H: 1.5

16RU12

Tube OD 1, Thread Tube OD Tx 3/4

A: 2.38
C: 1.04
CX: 0.86
D: 1.23
DX: 0.96
E: 0.62
F Hex: 1-1/2
G: 1-1/2
GX: 1-1/8
H: 1.5

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