U

Union

Tube-to-tube union fitting

Connects Fractional (Inch) Tube

Part No.	Tube OD T (inch)	Tube OD T (mm)	E Min.	h (inch)	h (mm)	H (inch)	H (mm)	F	I	L
U-01	1/16	1.58	1.3	5/16	7.93	5/16	7.93	8.6	17.5	25.1
U-02	1/8	3.17	2.3	7/16	11.11	7/16	11.11	12.7	22.4	35.6
U-03	3/16	4.76	3.0	7/16	11.11	1/2	12.70	12.7	24.1	37.3
U-04	1/4	6.35	4.8	1/2	12.70	9/16	14.28	15.2	26.2	40.9
U-05	5/16	7.93	6.4	9/16	14.28	5/8	15.87	16.3	28.2	42.9
U-06	3/8	9.52	7.1	5/8	15.87	11/16	17.46	16.8	30.2	45.0
U-08	1/2	12.70	10.4	13/16	20.63	7/8	22.22	22.9	31.0	51.3
U-10	5/8	15.87	12.7	15/16	23.81	1	25.40	24.4	31.8	52.1
U-12	3/4	19.05	15.7	1-1/16	26.98	1-1/8	28.57	24.4	33.3	53.6
U-14	7/8	22.22	18.3	1-3/16	30.16	1-1/4	31.75	25.9	35.1	55.4
U-16	1	25.40	22.4	1-3/8	34.92	1-1/2	38.10	31.2	40.4	64.8
U-20	1-1/4	31.75	27.7	1-3/4	44.45	1-7/8	47.63	41.1	48.0	92.2
U-24	1-1/2	38.10	34.0	2-1/8	53.97	2-1/4	57.15	50.0	53.6	108.0
U-32	2	50.80	46.0	2-3/4	69.85	3	76.20	67.6	74.7	149.4

All dimensions are in millimetres unless otherwise stated. E refers to the smallest opening. F and L are standard hand-tightened dimensions.

Connects Metric Tube

Part No.	Tube OD T (mm)	E Min.	h (mm)	H (mm)	F	I	L
U-M02	2	1.7	11.11	11.11	12.9	22.4	35.6
U-M03	3	2.4	11.11	11.11	12.9	22.1	35.3
U-M04	4	2.4	11.11	12.70	13.7	24.1	37.3
U-M06	6	4.8	12.70	14.28	15.3	26.2	41.0
U-M08	8	6.4	14.28	15.87	16.2	28.2	43.2
U-M10	10	7.9	17.46	19.05	17.2	31.0	46.2
U-M12	12	9.5	20.63	22.22	22.8	31.0	51.2
U-M14	14	11.1	23.81	25.40	24.4	31.8	52.0
U-M15	15	11.9	23.81	25.40	24.4	31.8	52.0
U-M16	16	12.7	23.81	25.40	24.4	31.8	52.0
U-M18	18	15.1	26.98	30.16	24.4	33.3	53.5
U-M22	22	18.3	30.16	31.75	26.0	34.8	55.0
U-M25	25	21.8	34.92	38.10	31.3	40.4	65.0
U-M28	28	21.8	44.45	47.63	36.6	43.4	85.0
U-M30	30	26.2	44.45	50.80	39.6	49.5	92.7
U-M32	32	28.6	44.45	50.80	42.0	51.3	97.3
U-M38	38	33.7	55.56	57.15	49.4	58.4	114.0

All dimensions are in millimetres unless otherwise stated. E refers to the smallest opening. F and L are standard hand-tightened dimensions.

RU

Reducing Union

Tube-to-tube reducing union fitting

Connects Fractional (Inch) Tube

Part No.	Tube OD T (inch)	Tube OD T (mm)	Tube OD T1 (inch)	Tube OD T1 (mm)	E Min.	h (inch)	h (mm)	H (inch)	H (mm)	H1 (inch)	H1 (mm)	F	F1	I	L
RU-0201	1/8	3.17	1/16	1.58	1.3	7/16	11.11	7/16	11.11	5/16	7.93	12.7	8.6	20.6	31.0
RU-0301	3/16	4.76	1/16	1.58	1.3	7/16	11.11	1/2	12.70	5/16	7.93	13.7	8.6	21.9	32.3
RU-0302	3/16	4.76	1/8	3.17	2.3	7/16	11.11	1/2	12.70	7/16	11.11	13.7	12.7	23.4	36.6
RU-0401	1/4	6.35	1/16	1.58	1.3	1/2	12.70	9/16	14.28	5/16	7.93	15.2	8.6	23.1	34.3
RU-0402	1/4	6.35	1/8	3.17	2.3	1/2	12.70	9/16	14.28	7/16	11.11	15.2	12.7	24.6	38.6
RU-0403	1/4	6.35	3/16	4.76	3.0	1/2	12.70	9/16	14.28	1/2	12.70	15.2	13.7	25.4	39.4
RU-0502	5/16	7.93	1/8	3.17	2.3	9/16	14.28	5/8	15.87	7/16	11.11	16.3	12.7	25.9	39.6
RU-0504	5/16	7.93	1/4	6.35	4.8	9/16	14.28	5/8	15.87	9/16	14.28	16.3	15.2	27.4	42.2
RU-0601	3/8	9.52	1/16	1.58	1.3	5/8	15.87	11/16	17.46	5/16	7.93	16.8	8.6	25.4	36.6
RU-0602	3/8	9.52	1/8	3.17	2.3	5/8	15.87	11/16	17.46	7/16	11.11	16.8	12.7	26.9	40.9
RU-0604	3/8	9.52	1/4	6.35	4.8	5/8	15.87	11/16	17.46	9/16	14.28	16.8	15.2	28.4	43.2
RU-0605	3/8	9.52	5/16	7.93	6.4	5/8	15.87	11/16	17.46	5/8	15.87	16.8	16.3	29.5	44.2
RU-0802	1/2	12.70	1/8	3.17	2.3	13/16	20.63	7/8	22.22	7/16	11.11	22.9	12.7	28.4	45.2
RU-0804	1/2	12.70	1/4	6.35	4.8	13/16	20.63	7/8	22.22	9/16	14.28	22.9	15.2	29.5	47.0
RU-0806	1/2	12.70	3/8	9.52	7.1	13/16	20.63	7/8	22.22	11/16	17.46	22.9	16.8	31.0	48.5
RU-1006	5/8	15.87	3/8	9.52	7.1	15/16	23.81	1	25.40	11/16	17.46	24.4	16.8	31.8	49.3
RU-1008	5/8	15.87	1/2	12.70	10.4	15/16	23.81	1	25.40	7/8	22.22	24.4	22.9	31.8	52.1
RU-1204	3/4	19.05	1/4	6.35	4.8	1-1/16	26.98	1-1/8	28.57	9/16	14.28	24.4	15.2	31.8	49.3
RU-1206	3/4	19.05	3/8	9.52	7.1	1-1/16	26.98	1-1/8	28.57	11/16	17.46	24.4	16.8	33.3	50.8
RU-1208	3/4	19.05	1/2	12.70	10.4	1-1/16	26.98	1-1/8	28.57	7/8	22.22	24.4	22.9	33.3	53.6
RU-1210	3/4	19.05	5/8	15.87	12.7	1-1/16	26.98	1-1/8	28.57	1	25.40	24.4	24.4	33.3	53.6
RU-1608	1	25.40	1/2	12.70	10.4	1-3/8	34.92	1-1/2	38.10	7/8	22.22	31.2	22.9	40.9	63.2
RU-1612	1	25.40	3/4	19.05	15.7	1-3/8	34.92	1-1/2	38.10	1-1/8	28.57	31.2	24.4	40.9	63.2

All dimensions are in millimetres unless otherwise stated. E refers to the smallest opening. F and L are standard hand-tightened dimensions.

Connects Metric Tube

Part No.	Tube OD T (mm)	Tube OD T1 (mm)	E Min.	h (mm)	H (mm)	H1 (mm)	F	F1	I	L
RU-M06M03	6	3	2.4	12.70	14.28	11.11	15.3	12.9	24.6	38.6
RU-M06M04	6	4	2.4	12.70	14.28	12.70	15.3	13.7	25.4	39.4
RU-M08M06	8	6	4.8	14.28	15.87	14.28	16.2	15.3	27.4	42.3
RU-M10M06	10	6	4.8	17.46	19.05	14.28	17.2	15.3	29.5	44.5
RU-M12M06	12	6	4.8	20.63	22.22	14.28	22.8	15.3	29.5	47.0
RU-M12M08	12	8	6.4	20.63	22.22	15.87	22.8	16.2	30.2	47.8
RU-M12M10	12	10	7.9	20.63	22.22	19.05	22.8	17.2	31.0	48.7
RU-M16M10	16	10	7.9	23.81	25.40	19.05	24.4	17.2	31.8	49.5
RU-M16M12	16	12	9.5	23.81	25.40	22.22	24.4	22.8	31.8	52.0
RU-M18M12	18	12	9.5	26.98	30.16	22.22	24.4	22.8	33.3	53.5
RU-M25M18	25	18	15.1	34.92	38.10	30.16	31.3	24.4	38.6	61.0
RU-M25M20	25	20	15.9	34.92	38.10	31.75	31.3	26.0	39.9	62.3

All dimensions are in millimetres unless otherwise stated. E refers to the smallest opening. F and L are standard hand-tightened dimensions.

Connects Metric Tube to Fractional (Inch) Tube

Part No.	Tube OD T (mm)	Tube OD T1 (inch)	Tube OD T1 (mm)	E Min.	h (mm)	H (mm)	H1 (inch)	H1 (mm)	F	F1	I	L
RU-M0402	4	1/8	3.17	2.4	11.11	12.70	7/16	11.11	13.7	12.7	23.4	36.5
RU-M0404	4	1/4	6.35	2.4	12.70	12.70	9/16	14.28	13.7	15.2	25.4	39.4
RU-M0602	6	1/8	3.17	2.4	12.70	14.28	7/16	11.11	15.3	12.7	24.6	38.5
RU-M0604	6	1/4	6.35	4.8	12.70	14.28	9/16	14.28	15.3	15.2	26.2	41.0
RU-M0605	6	5/16	7.93	4.8	14.28	14.28	5/8	15.87	15.3	16.3	27.4	42.3
RU-M0804	8	1/4	6.35	4.8	14.28	15.87	9/16	14.28	16.2	15.2	27.4	42.3
RU-M1004	10	1/4	6.35	4.8	17.46	19.05	9/16	14.28	17.2	15.2	29.5	44.5
RU-M1006	10	3/8	9.52	7.1	17.46	19.05	11/16	17.46	17.2	16.8	31.0	45.9
RU-M1206	12	3/8	9.52	7.1	20.63	22.22	11/16	17.46	22.8	16.8	31.0	48.4
RU-M1208	12	1/2	12.70	9.5	20.63	22.22	7/8	22.22	22.8	22.9	31.0	51.2
RU-M1508	15	1/2	12.70	10.4	23.81	25.40	7/8	22.22	24.4	22.9	31.8	52.0

All dimensions are in millimetres unless otherwise stated. E refers to the smallest opening. F and L are standard hand-tightened dimensions.

BU

Bulkhead Union

Panel-mount tube-to-tube union fitting

Connects Fractional (Inch) Tube

Part No.	Tube OD T (inch)	Tube OD T (mm)	E Min.	h (inch)	h (mm)	H (inch)	H (mm)	F	I	I1	L	L1	Panel Hole Size	Max Panel Thickness
BU-01	1/16	1.68	1.3	5/16	7.93	5/16	7.93	8.6	23.9	13.5	31.5	17.3	5.2	3.1
BU-02	1/8	3.17	2.3	1/2	12.70	7/16	11.11	12.7	38.1	24.6	51.3	31.2	8.3	12.7
BU-03	3/16	4.76	3.0	9/16	14.28	1/2	12.70	13.7	40.4	25.4	53.6	32.0	9.9	12.7
BU-04	1/4	6.35	4.8	5/8	15.87	9/16	14.28	15.2	42.9	26.2	57.7	33.5	11.5	10.2
BU-05	5/16	7.93	6.4	11/16	17.46	5/8	15.87	16.3	46.0	28.4	60.7	35.8	13.1	11.2
BU-06	3/8	9.52	7.1	3/4	19.05	11/16	17.46	16.8	47.5	29.5	62.2	36.8	14.7	11.2
BU-08	1/2	12.70	10.4	15/16	23.81	7/8	22.22	22.9	50.8	31.8	71.1	41.9	19.4	12.7
BU-10	5/8	15.87	12.7	1-1/16	26.98	1	25.40	24.4	52.3	32.5	72.6	42.7	22.6	12.7
BU-12	3/4	19.05	15.7	1-3/16	30.16	1-1/8	28.57	24.4	58.7	37.3	79.0	47.5	25.8	16.8
BU-14	7/8	22.22	18.3	1-3/8	34.92	1-1/4	31.75	25.9	64.3	42.9	84.6	53.1	29.0	19.1
BU-16	1	25.40	22.4	1-5/8	41.27	1-1/2	38.10	31.2	71.4	45.2	95.8	57.4	33.7	19.1
BU-20	1-1/4	31.75	27.7	1-7/8	47.63	1-7/8	47.63	41.1	78.9	47.8	123.2	69.9	41.7	19.1
BU-24	1-1/2	38.10	34.0	2-1/4	57.15	2-1/4	57.15	50.0	84.8	49.3	139.2	76.5	49.6	19.1
BU-32	2	50.80	46.0	2-3/4	69.85	3	76.20	67.6	105.7	56.4	180.3	93.7	67.1	19.1

All dimensions are in millimetres unless otherwise stated. E refers to the smallest opening. F and L are standard hand-tightened dimensions.

Connects Metric Tube

Part No.	Tube OD T (mm)	E Min.	h (mm)	H (mm)	F	I	I1	L	L1	Panel Hole Size	Max Panel Thickness
BU-M03	3	2.4	14.28	11.11	12.9	38.1	24.6	51.3	31.2	8.3	12.7
BU-M04	4	2.4	14.28	12.70	13.7	40.4	25.4	53.6	32.0	9.9	12.7
BU-M06	6	4.8	15.87	14.28	15.3	42.9	26.2	57.7	33.6	11.5	10.2
BU-M08	8	6.4	17.46	15.87	16.2	46.0	28.6	61.0	36.1	13.1	11.2
BU-M10	10	7.9	22.22	19.05	17.2	48.5	29.4	63.7	37.0	16.2	11.2
BU-M12	12	9.5	23.81	22.22	22.8	50.8	31.8	71.0	41.9	19.5	12.7
BU-M14	14	11.1	26.98	25.40	24.4	52.3	32.5	72.5	42.6	22.8	12.7
BU-M15	15	11.9	26.98	25.40	24.4	52.3	32.5	72.5	42.6	22.8	12.7
BU-M16	16	12.7	26.98	25.40	24.4	52.3	32.5	72.5	42.6	22.8	12.7
BU-M18	18	15.1	30.16	30.16	24.4	58.7	37.3	78.9	47.4	26.0	16.8
BU-M20	20	15.9	34.92	31.75	26.0	64.3	42.9	84.5	53.0	29.0	17.0
BU-M22	22	18.3	34.92	31.75	26.0	64.3	42.9	84.5	53.0	29.0	19.1
BU-M25	25	21.8	41.27	38.10	31.3	71.4	45.2	96.0	57.5	33.7	19.1
BU-M32	32	28.6	50.80	50.80	42.0	82.3	49.5	128.3	72.5	42.5	19.0
BU-M38	38	33.7	60.30	57.15	49.4	89.8	51.9	145.0	79.5	50.5	19.0

All dimensions are in millimetres unless otherwise stated. E refers to the smallest opening. F and L are standard hand-tightened dimensions.

Reference dimensions may be changed by the manufacturer without notice. Confirm the current technical datasheet before final engineering selection or procurement.