1CO 1DO Thread Stud Ends with O-ring Sealing Adapter Fittings UN/UNF

The 1CO/1DO UN/UNF thread studs are ISO 11926-compliant hydraulic fittings with O-ring face sealing. Made of zinc-nickel plated carbon steel, they handle up to 400 bar, suiting heavy equipment/machine tools for compact, leak-proof high-pressure connections. It is similar to Parker's GE-UNF series.

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Description

1. Product Overview

The 1CO/1DO UN/UNF thread studs are high-pressure hydraulic fittings compliant with ISO 11926 standard. Adopting O-ring face sealing and compact structure, they are engineered for leak-proof connection in hydraulic systems. The series is fully equivalent to Parker GE-UNF series, serving as standard connection components for heavy-duty equipment pipelines.

1CO 1DO-图纸

2. Structural & Sealing Features

Designed as straight male stud type with two model specifications: 1CO and 1DO, tailored for reliable fluid power transmission.

Equipped with UN (Unified National Coarse) and UNF (Unified National Fine) threads, ensuring firm mechanical engagement with matched female ports.

O-ring fitted in face groove (NBR, Viton or EPDM optional) forms tight face seal after compression, achieving permanent leak-tight performance under high pressure.

3. Material & Pressure Performance

Made of high-strength carbon steel with zinc-nickel plated surface for excellent corrosion resistance.

Rated working pressure up to 400 bar (6000 PSI), suitable for long-term operation in medium and high-pressure hydraulic circuits.

Precision forged construction offers great impact resistance and durability against repeated assembly and disassembly.

4. Standard & Interchangeability

Fully compliant with ISO 11926 international standard, directly interchangeable with mainstream UN/UNF hydraulic fittings.

Dimension and performance matched with Parker GE-UNF series, ideal as direct replacement parts.

5. Application Scenarios

Hydraulic port connection for heavy-duty construction machinery

High-pressure pipeline connection of machine tools

Compact sealed connection for industrial machinery and fluid power systems

Hydraulic assembly equipment requiring compact layout and high-pressure leak-proof performance

Specifications

PART NO.	THREAD		TUBE O.D.	DIMENSIONS					MPa
PART NO.	E	F	D1	B	11	L1	S1	S2	MPa
1CO-14-04	M14X1.5	7/16"X20	8	9	10	25	17	17	31.5 L series
1CO-16-04	M16X1.5	7/16"×20	10	9	11	26	17	19
1CO-18-06	M18X1.5	9/16"×18	12	10	11	26	19	22
1CO-18-08	M18X1.5	3/4"×16	12	11	13	28	24	22
1CO-18-10	M18X1.5	7/8"X14	12	12.7	14.3	29	27	22
1CO-22-08	M22X1.5	3/4"×16	15	11	14	29	24	27
1CO-22-10	M22X1.5	7/8"X14	15	12.7	15.3	30	27	27
1CO-22-12	M22X1.5	1.1/16"×12	15	15.09	11.91	30	32	27
1CO-26-08	M26X1.5	3/4"X16	18	11	14.5	31	27	32
1CO-26-10	M26X1.5	7/8"X14	18	12.7	14.8	31	27	32
1CO-30-08	M30X2	3/4"×16	18	11.13	13.87	33	32	36	16 L series
1CO-30-10	M30X2	7/8"×14	22	12.7	16.8	33	32	36
1CO-30-12	M30×2	1.1/16"X12	22	15	16.5	33	32	36
1CO-30-16	M30X2	1.5/16"X12	22	15	17.5	34	41	36
1CO-36-12	M36X2	1.1/16"X12	28	15.09	14.41	34	41	41
1CO-36-16	M36X2	1.5/16"×12	28	15	17.5	34	41	41
1CO-45-16	M45X2	1.5/16"×12	35	15	17.5	39	46	50
1CO-45-20	M45×2	1.5/8"×12	35	15.09	16.41	39	50	50
1CO-52-20	M52X2	1.5/8"X12	42	15.09	15.91	42	55	60
1DO-16-04	M16X1.5	7/16"X20	8	9	15	30	17	19	63 S series
1DO-18-06	M18X1.5	9/16"×18	10	10	14.5	31	19	22
1DO-20-06	M20X1.5	9/16"×18	12	10	14.5	31	22	24
1DO-20-08	M20X1.5	3/4"X16	12	11	17.5	34	24	24
1DO-24-08	M24X1.5	3/4"×16	16	11	15.5	34	24	30	40 S series
1DO-24-10	M24X1.5	7/8"X14	16	12.7	18.8	37	27	30
1DO-30-08	M30X2	3/4"X16	20	11	20.5	42	32	36
1DO-30-10	M30X2	7/8"X14	20	12.7	20.8	42	32	36
1DO-30-12	M30X2	1.1/16"×12	20	15	20.5	42	32	36
1DO-36-12	M36X2	1.1/16"X12	25	15.09	19.91	47	41	46
1DO-36-16	M36X2	1.5/16"×12	25	15	23	47	41	46
1DO-42-16	M42X2	1.5/16"X12	30	15	23.5	50	46	50
1DO-42-20	M42X2	1.5/8"×12	30	15	23.5	50	50	50
1DO-52-20	M52X2	1.5/8"×12	38	15.09	22.9	53.9	55	60	31.5 S series
Note:In case if you are interested to order the adapter in complete set with cutting ring and nut it is necessary to insert suffix "RN"after our part no.,for example 1CO-30-10RN.