SRU Reducing Unions - USA SUPERLOK - Tube Fittings - Ball Valves - Pipe Fittings

SRU Reducing Unions

Reducing Union – SRU Reducing Unions

The Reducing Union is a high-performance fitting designed for secure tube-to-tube connections in industrial fluid systems. Made from stainless steel, it ensures durability and leak-proof performance in high-pressure environments. This union facilitates transitions between different tubing sizes while maintaining structural integrity. Widely used in instrumentation, gas distribution, and hydraulic applications, it provides a reliable connection without compromising system efficiency.

Browse all Reducing Unions below to find the perfect component for your fluid system.

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SKU: 17630 Category: Union Tube Fittings

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SRU-Reducing-Unions.pdf

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Specifications

Superlok Part Type	Union

Available Sizes

SRU 2-1 SRU Reducing Unions

SRU 1/8 in. Tube Outside Diameter D x 1/16 in. Tube Outside Diameter D1 Reducing Union

Dimension A	12.70mm
Dimension A1	8.63mm
Dimension B	15.24mm
Dimension B1	10.92mm
Dimension I	20.60mm
Dimension L	31.00mm
Dimension L2	mm
Dimension d [Min]	1.27mm

Inch/Metric	Inch
Tube Outside Diameter D	1/8in, mm
Tube Outside Diameter D1	1/16in, mm
Width Across Flats H1	5/16in, mm
Width Across Flats h	7/16in, mm

Swagelok®	200-6-1
Parker (Alok)®	2RU1
Hy-Lok®	CUR 2-1
Tylok (CBC-Lok)®	2-DRU-1
Ham-Let (Let-Lok)®	763L 1/8 X 1/16
Hoke (Gyrolok)®	2RU1
Dk-Lok®	DUR2-1
Bi-Lok (Series D)®	DUR-2-1
SSP (DUlok)®	D2RU1

SRU 3-2 SRU Reducing Unions

SRU 3/16 in. Tube Outside Diameter D x 1/8 in. Tube Outside Diameter D1 Reducing Union

Dimension A	13.71mm
Dimension A1	12.70mm
Dimension B	16.00mm
Dimension B1	15.24mm
Dimension I	23.36mm
Dimension L	36.57mm
Dimension L2	mm
Dimension d [Min]	2.28mm

Inch/Metric	Inch
Tube Outside Diameter D	3/16in, mm
Tube Outside Diameter D1	1/8in, mm
Width Across Flats H1	7/16in, mm
Width Across Flats h	7/16in, mm

Swagelok®	300-6-2
Parker (Alok)®	3RU2
Hy-Lok®	CUR 3-2
Tylok (CBC-Lok)®	3-DRU-2
Ham-Let (Let-Lok)®	763L 3/16 X 1/8
Hoke (Gyrolok)®	3RU2
Dk-Lok®	DUR3-2
Bi-Lok (Series D)®	DUR-3-2
SSP (DUlok)®	D3RU2

SRU 4-2 SRU Reducing Unions

SRU 1/4 in. Tube Outside Diameter D x 1/8 in. Tube Outside Diameter D1 Reducing Union

Dimension A	15.24mm
Dimension A1	12.70mm
Dimension B	17.78mm
Dimension B1	15.24mm
Dimension I	24.63mm
Dimension L	38.60mm
Dimension L2	mm
Dimension d [Min]	2.28mm

Inch/Metric	Inch
Tube Outside Diameter D	1/4in, mm
Tube Outside Diameter D1	1/8in, mm
Width Across Flats H1	7/16in, mm
Width Across Flats h	1/2in, mm

Swagelok®	400-6-2
Parker (Alok)®	4RU2
Hy-Lok®	CUR 4-2
Tylok (CBC-Lok)®	4-DRU-2
Ham-Let (Let-Lok)®	763L 1/4 X 1/8
Hoke (Gyrolok)®	4RU2
Dk-Lok®	DUR4-2
Bi-Lok (Series D)®	DUR-4-2
SSP (DUlok)®	D4RU2

SRU 4-3 SRU Reducing Unions

SRU 1/4 in. Tube Outside Diameter D x 3/16 in. Tube Outside Diameter D1 Reducing Union

Dimension A	15.24mm
Dimension A1	13.71mm
Dimension B	17.78mm
Dimension B1	16.00mm
Dimension I	25.40mm
Dimension L	39.37mm
Dimension L2	mm
Dimension d [Min]	3.04mm

Inch/Metric	Inch
Tube Outside Diameter D	1/4in, mm
Tube Outside Diameter D1	3/16in, mm
Width Across Flats H1	1/2in, mm
Width Across Flats h	1/2in, mm

Swagelok®	400-6-3
Parker (Alok)®	4RU3
Hy-Lok®	CUR 4-3
Tylok (CBC-Lok)®	4-DRU-3
Ham-Let (Let-Lok)®	763L 1/4 X 3/16
Hoke (Gyrolok)®	4RU3
Dk-Lok®	DUR4-3
Bi-Lok (Series D)®	DUR-4-3
SSP (DUlok)®	D4RU3

SRU 5-2-TM SRU Reducing Unions

SRU 5/16 in. Tube Outside Diameter D x 1/8 in. Tube Outside Diameter D1 Reducing Union with Bored Through

Dimension A	16.25mm
Dimension A1	12.70mm
Dimension B	18.54mm
Dimension B1	15.24mm
Dimension I	25.90mm
Dimension L	39.87mm
Dimension L2	mm
Dimension d [Min]	2.28mm

Inch/Metric	Inch
Tube Outside Diameter D	5/16in, mm
Tube Outside Diameter D1	1/8in, mm
Width Across Flats H1	7/16in, mm
Width Across Flats h	9/16in, mm

SRU 5-4 SRU Reducing Unions

SRU 5/16 in. Tube Outside Diameter D x 1/4 in. Tube Outside Diameter D1 Reducing Union

Dimension A	16.25mm
Dimension A1	15.24mm
Dimension B	18.54mm
Dimension B1	17.78mm
Dimension I	27.43mm
Dimension L	42.16mm
Dimension L2	mm
Dimension d [Min]	4.82mm

Inch/Metric	Inch
Tube Outside Diameter D	5/16in, mm
Tube Outside Diameter D1	1/4in, mm
Width Across Flats H1	9/16in, mm
Width Across Flats h	9/16in, mm

Swagelok®	500-6-4
Parker (Alok)®	5RU4
Hy-Lok®	CUR 5-4
Tylok (CBC-Lok)®	5-DRU-4
Ham-Let (Let-Lok)®	763L 5/16 X 1/4
Hoke (Gyrolok)®	5RU4
Dk-Lok®	DUR5-4
Bi-Lok (Series D)®	DUR-5-4
SSP (DUlok)®	D5RU4

SRU 6-2 SRU Reducing Unions

SRU 3/8 in. Tube Outside Diameter D x 1/8 in. Tube Outside Diameter D1 Reducing Union

Dimension A	16.76mm
Dimension A1	12.70mm
Dimension B	19.30mm
Dimension B1	15.24mm
Dimension I	26.92mm
Dimension L	40.89mm
Dimension L2	mm
Dimension d [Min]	2.28mm

Inch/Metric	Inch
Tube Outside Diameter D	3/8in, mm
Tube Outside Diameter D1	1/8in, mm
Width Across Flats H1	7/16in, mm
Width Across Flats h	5/8in, mm

Swagelok®	600-6-2
Parker (Alok)®	6RU2
Hy-Lok®	CUR 6-2
Tylok (CBC-Lok)®	6-DRU-2
Ham-Let (Let-Lok)®	763L 3/8 X 1/8
Hoke (Gyrolok)®	6RU2
Dk-Lok®	DUR6-2
Bi-Lok (Series D)®	DUR-6-2
SSP (DUlok)®	D6RU2

SRU 6-4 SRU Reducing Unions

SRU 3/8 in. Tube Outside Diameter D x 1/4 in. Tube Outside Diameter D1 Reducing Union

Dimension A	16.76mm
Dimension A1	15.24mm
Dimension B	19.30mm
Dimension B1	17.78mm
Dimension I	28.44mm
Dimension L	43.18mm
Dimension L2	mm
Dimension d [Min]	4.82mm

Inch/Metric	Inch
Tube Outside Diameter D	3/8in, mm
Tube Outside Diameter D1	1/4in, mm
Width Across Flats H1	9/16in, mm
Width Across Flats h	5/8in, mm

Swagelok®	600-6-4
Parker (Alok)®	6RU4
Hy-Lok®	CUR 6-4
Tylok (CBC-Lok)®	6-DRU-4
Ham-Let (Let-Lok)®	763L 3/8 X 1/4
Hoke (Gyrolok)®	6RU4
Dk-Lok®	DUR6-4
Bi-Lok (Series D)®	DUR-6-4
SSP (DUlok)®	D6RU4

SRU 6-5 SRU Reducing Unions

SRU 3/8 in. Tube Outside Diameter D x 5/16 in. Tube Outside Diameter D1 Reducing Union

Dimension A	16.76mm
Dimension A1	16.25mm
Dimension B	19.30mm
Dimension B1	18.54mm
Dimension I	29.46mm
Dimension L	44.19mm
Dimension L2	mm
Dimension d [Min]	6.35mm

Inch/Metric	Inch
Tube Outside Diameter D	3/8in, mm
Tube Outside Diameter D1	5/16in, mm
Width Across Flats H1	5/8in, mm
Width Across Flats h	5/8in, mm

Swagelok®	600-6-5
Parker (Alok)®	6RU5
Hy-Lok®	CUR 6-5
Tylok (CBC-Lok)®	6-DRU-5
Ham-Let (Let-Lok)®	763L 3/8 X 5/16
Hoke (Gyrolok)®	6RU5
Dk-Lok®	DUR6-5
Bi-Lok (Series D)®	DUR-6-5
SSP (DUlok)®	D6RU5

SRU 8-2 SRU Reducing Unions

SRU 1/2 in. Tube Outside Diameter D x 1/8 in. Tube Outside Diameter D1 Reducing Union

Dimension A	22.86mm
Dimension A1	12.70mm
Dimension B	21.84mm
Dimension B1	15.24mm
Dimension I	28.44mm
Dimension L	45.21mm
Dimension L2	mm
Dimension d [Min]	2.28mm

Inch/Metric	Inch
Tube Outside Diameter D	1/2in, mm
Tube Outside Diameter D1	1/8in, mm
Width Across Flats H1	7/16in, mm
Width Across Flats h	13/16in, mm

Swagelok®	810-6-2
Parker (Alok)®	8RU2
Hy-Lok®	CUR 8-2
Tylok (CBC-Lok)®	8-DRU-2
Ham-Let (Let-Lok)®	763L 1/2 X 1/8
Hoke (Gyrolok)®	8RU2
Dk-Lok®	DUR8-2
Bi-Lok (Series D)®	DUR-8-2
SSP (DUlok)®	D8RU2

SRU 8-4 SRU Reducing Unions

SRU 1/2 in. Tube Outside Diameter D x 1/4 in. Tube Outside Diameter D1 Reducing Union

Dimension A	22.86mm
Dimension A1	15.24mm
Dimension B	21.84mm
Dimension B1	17.78mm
Dimension I	29.46mm
Dimension L	46.99mm
Dimension L2	mm
Dimension d [Min]	4.82mm

Inch/Metric	Inch
Tube Outside Diameter D	1/2in, mm
Tube Outside Diameter D1	1/4in, mm
Width Across Flats H1	9/16in, mm
Width Across Flats h	13/16in, mm

Swagelok®	810-6-4
Parker (Alok)®	8RU4
Hy-Lok®	CUR 8-4
Tylok (CBC-Lok)®	8-DRU-4
Ham-Let (Let-Lok)®	763L 1/2 X 1/4
Hoke (Gyrolok)®	8RU4
Dk-Lok®	DUR8-4
Bi-Lok (Series D)®	DUR-8-4
SSP (DUlok)®	D8RU4

SRU 8-4-TM SRU Reducing Unions

SRU 1/2 in. Tube Outside Diameter D x 1/4 in. Tube Outside Diameter D1 Reducing Union with Bored Through

Dimension A	22.86mm
Dimension A1	15.24mm
Dimension B	21.84mm
Dimension B1	17.78mm
Dimension I	29.46mm
Dimension L	46.99mm
Dimension L2	mm
Dimension d [Min]	4.82mm

Inch/Metric	Inch
Tube Outside Diameter D	1/2in, mm
Tube Outside Diameter D1	1/4in, mm
Width Across Flats H1	9/16in, mm
Width Across Flats h	13/16in, mm

SRU 8-6 SRU Reducing Unions

SRU 1/2 in. Tube Outside Diameter D x 3/8 in. Tube Outside Diameter D1 Reducing Union

Dimension A	22.86mm
Dimension A1	16.76mm
Dimension B	21.84mm
Dimension B1	19.30mm
Dimension I	30.98mm
Dimension L	48.51mm
Dimension L2	mm
Dimension d [Min]	7.11mm

Inch/Metric	Inch
Tube Outside Diameter D	1/2in, mm
Tube Outside Diameter D1	3/8in, mm
Width Across Flats H1	11/16in, mm
Width Across Flats h	13/16in, mm

Swagelok®	810-6-6
Parker (Alok)®	8RU6
Hy-Lok®	CUR 8-6
Tylok (CBC-Lok)®	8-DRU-6
Ham-Let (Let-Lok)®	763L 1/2 X 3/8
Hoke (Gyrolok)®	8RU6
Dk-Lok®	DUR8-6
Bi-Lok (Series D)®	DUR-8-6
SSP (DUlok)®	D8RU6

SRU 8M-6M SRU Reducing Unions

SRU 8 mm Tube Outside Diameter D x 6 mm Tube Outside Diameter D1 Reducing Union

Dimension A	16.2mm
Dimension A1	15.3mm
Dimension B	18.6mm
Dimension B1	17.7mm
Dimension I	27.4mm
Dimension L	42.3mm
Dimension L2	mm
Dimension d [Min]	4.8mm

Inch/Metric	Metric
Tube Outside Diameter D	in, 8mm
Tube Outside Diameter D1	in, 6mm
Width Across Flats H1	in, 14mm
Width Across Flats h	in, 15mm

SRU 10-6 SRU Reducing Unions

SRU 5/8 in. Tube Outside Diameter D x 3/8 in. Tube Outside Diameter D1 Reducing Union

Dimension A	24.38mm
Dimension A1	16.76mm
Dimension B	21.84mm
Dimension B1	19.30mm
Dimension I	31.75mm
Dimension L	49.27mm
Dimension L2	mm
Dimension d [Min]	7.11mm

Inch/Metric	Inch
Tube Outside Diameter D	5/8in, mm
Tube Outside Diameter D1	3/8in, mm
Width Across Flats H1	11/16in, mm
Width Across Flats h	15/16in, mm

Swagelok®	1010-6-6
Parker (Alok)®	10RU6
Hy-Lok®	CUR 10-6
Tylok (CBC-Lok)®	10-DRU-6
Ham-Let (Let-Lok)®	763L 5/8 X 3/8
Hoke (Gyrolok)®	10RU6
Dk-Lok®	DUR10-6
Bi-Lok (Series D)®	DUR-10-6
SSP (DUlok)®	D10RU6

SRU 10-8 SRU Reducing Unions

SRU 5/8 in. Tube Outside Diameter D x 1/2 in. Tube Outside Diameter D1 Reducing Union

Dimension A	24.38mm
Dimension A1	22.86mm
Dimension B	21.84mm
Dimension B1	21.84mm
Dimension I	31.75mm
Dimension L	52.07mm
Dimension L2	mm
Dimension d [Min]	10.41mm

Inch/Metric	Inch
Tube Outside Diameter D	5/8in, mm
Tube Outside Diameter D1	1/2in, mm
Width Across Flats H1	7/8in, mm
Width Across Flats h	15/16in, mm

Swagelok®	1010-6-8
Parker (Alok)®	10RU8
Hy-Lok®	CUR 10-8
Tylok (CBC-Lok)®	10-DRU-8
Ham-Let (Let-Lok)®	763L 5/8 X 1/2
Hoke (Gyrolok)®	10RU8
Dk-Lok®	DUR10-8
Bi-Lok (Series D)®	DUR-10-8
SSP (DUlok)®	D10RU8

SRU 12-4 SRU Reducing Unions

SRU 3/4 in. Tube Outside Diameter D x 1/4 in. Tube Outside Diameter D1 Reducing Union

Dimension A	24.38mm
Dimension A1	15.24mm
Dimension B	21.84mm
Dimension B1	17.78mm
Dimension I	31.75mm
Dimension L	49.27mm
Dimension L2	mm
Dimension d [Min]	4.82mm

Inch/Metric	Inch
Tube Outside Diameter D	3/4in, mm
Tube Outside Diameter D1	1/4in, mm
Width Across Flats H1	9/16in, mm
Width Across Flats h	1-1/16in, mm

Swagelok®	1210-6-4
Parker (Alok)®	12RU4
Hy-Lok®	CUR 12-4
Tylok (CBC-Lok)®	12-DRU-4
Ham-Let (Let-Lok)®	763L 3/4 X 1/4
Hoke (Gyrolok)®	12RU4
Dk-Lok®	DUR12-4
Bi-Lok (Series D)®	DUR-12-4
SSP (DUlok)®	D12RU4

SRU 12-6 SRU Reducing Unions

SRU 3/4 in. Tube Outside Diameter D x 3/8 in. Tube Outside Diameter D1 Reducing Union

Dimension A	24.38mm
Dimension A1	16.76mm
Dimension B	21.84mm
Dimension B1	19.30mm
Dimension I	33.27mm
Dimension L	50.80mm
Dimension L2	mm
Dimension d [Min]	7.11mm

SRU 12-8 SRU Reducing Unions

SRU 3/4 in. Tube Outside Diameter D x 1/2 in. Tube Outside Diameter D1 Reducing Union

SRU 12-10 SRU Reducing Unions

SRU 3/4 in. Tube Outside Diameter D x 5/8 in. Tube Outside Diameter D1 Reducing Union

SRU 16-8 SRU Reducing Unions

SRU 1 in. Tube Outside Diameter D x 1/2 in. Tube Outside Diameter D1 Reducing Union

SRU 16-12 SRU Reducing Unions

SRU 1in. Tube Outside Diameter D x 3/4 in. Tube Outside Diameter D1 Reducing Union

Swagelok®	1210-6-6
Parker (Alok)®	12RU6
Hy-Lok®	CUR 12-6
Tylok (CBC-Lok)®	12-DRU-6
Ham-Let (Let-Lok)®	763L 3/4 X 3/8
Hoke (Gyrolok)®	12RU6
Dk-Lok®	DUR12-6
Bi-Lok (Series D)®	DUR-12-6
SSP (DUlok)®	D12RU6

Swagelok®	1210-6-8
Parker (Alok)®	12RU8
Hy-Lok®	CUR 12-8
Tylok (CBC-Lok)®	12-DRU-8
Ham-Let (Let-Lok)®	763L 3/4 X 1/2
Hoke (Gyrolok)®	12RU8
Dk-Lok®	DUR12-8
Bi-Lok (Series D)®	DUR-12-8
SSP (DUlok)®	D12RU8

Swagelok®	1210-6-10
Parker (Alok)®	12RU10
Hy-Lok®	CUR 12-10
Tylok (CBC-Lok)®	12-DRU-10
Ham-Let (Let-Lok)®	763L 3/4 X 5/8
Hoke (Gyrolok)®	12RU10
Dk-Lok®	DUR12-10
Bi-Lok (Series D)®	DUR-12-10
SSP (DUlok)®	D12RU10

Dimension A	31.24mm
Dimension A1	22.86mm
Dimension B	26.41mm
Dimension B1	21.84mm
Dimension I	39.50mm
Dimension L	63.24mm
Dimension L2	mm
Dimension d [Min]	10.41mm

Swagelok®	1610-6-8
Parker (Alok)®	16RU8
Hy-Lok®	CUR 16-8
Tylok (CBC-Lok)®	16-DRU-8
Ham-Let (Let-Lok)®	763L 1 X 1/2
Hoke (Gyrolok)®	16RU8
Dk-Lok®	DUR16-8
Bi-Lok (Series D)®	DUR-16-8
SSP (DUlok)®	D16RU8

Swagelok®	1610-6-12
Parker (Alok)®	16RU12
Hy-Lok®	CUR 16-12
Tylok (CBC-Lok)®	16-DRU-12
Ham-Let (Let-Lok)®	763L 1 X 3/4
Hoke (Gyrolok)®	16RU12
Dk-Lok®	DUR16-12
Bi-Lok (Series D)®	DUR-16-12
SSP (DUlok)®	D16RU12