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#4 X #3 MJIC UNION

Description & Features

This straight steel #4 X #3 MJIC UNION, part of the 2403 series, is designed for hydraulic applications requiring a secure and reliable connection. Featuring male JIC SAE 37-degree flare threads on both ends, this union ensures a tight seal and optimal performance.

The union is constructed from a raw straight steel material, offering durability and strength in demanding environments. With a maximum dynamic pressure rating of 7,500 PSI, it is suitable for high-pressure hydraulic systems. The thread sizes are 7/16-20 and 3/8-24, both adhering to SAE J514 specifications.

SKU: 2403-04-03

Supplier Part Number (MPN): 2403-04-03

Alternate Part Numbers: A2027-4-3S

Specifications

Brand BRENNAN	Connection Size 1 1/4 in	Connection Size 2 3/16 in	Connection Type Male JIC	Connection Type 1 Male SAE 37 deg JIC Flare	Connection Type 2 Male SAE 37 deg JIC Flare	Dimension Standards SAE J514	Dimensions 1.3 in L	Finish Trivalent Zinc-Plated	Fitting Type Adapter	Hex Size 1/2 in	Material Steel	Material Construction 12L14/C1045 Steel	Series 2403 Series	Thread 2 Drill Dimensions 0.125 in	Thread B1 Drill Dimensions 0.172 in	Thread Size 7/16-20 x 3/8-24

Similar Products

Model Number	Connection Size 1	Connection Size 2	Material Construction	Thread Size	Hex Size
2403-02-02	1/8 in	1/8 in	12L14/C1045 Steel	5/16-24	7/16 in
2403-03-02	3/16 in	1/8 in	12L14/C1045 Steel	5/16-24, 3/8-24	7/16 in
2403-03-03	3/16 in	3/16 in	12L14/C1045 Steel	3/8-24	7/16 in
2403-04-02	1/4 in	1/8 in	12L14/C1045 Steel	7/16-20 x 5/16-24	1/2 in
2403-04-04	1/4 in	1/4 in	12L14/C1045 Steel	7/16-20	1/2 in
2403-05-04	5/16 in	1/4 in	12L14/C1045 Steel	1/2-20 x 7/16-20	0.563 in
2403-05-05	5/16 in	5/16 in	12L14/C1045 Steel	1/2-20	0.563 in
2403-06-04	3/8 in	1/4 in	12L14/C1045 Steel	9/16-18, 7/16-20	5/8 in
2403-06-05	3/8 in	5/16 in	12L14/C1045 Steel	9/16-18 x 1/2-20	5/8 in
2403-06-06	3/8 in	3/8 in	12L14/C1045 Steel	9/16-18	5/8 in
2403-08-04	1/2 in	1/4 in	12L14/C1045 Steel	3/4-16 x 7/16-20	0.81 in
2403-08-05	1/2 in	5/16 in	12L14/C1045 Steel	1/2-20 x 3/4-16	0.81 in
2403-08-06	1/2 in	3/8 in	12L14/C1045 Steel	3/4-16, 9/16-18	0.81 in
2403-08-08	1/2 in	1/2 in	12L14/C1045 Steel	3/4-16	0.81 in
2403-10-04 Steel Male JIC To JIC Adapter	5/8 in	1/4 in	AISI 12L14/C1045 Steel	7/8-14 x 7/16-20	0.94 in
2403-10-06	5/8 in	3/8 in	12L14/C1045 Steel	7/8-14 x 9/16-18	0.94 in
2403-10-08	5/8 in	1/2 in	12L14/C1045 Steel	7/8-14 x 3/4-16	0.94 in
2403-10-10	5/8 in	5/8 in	12L14/C1045 Steel	7/8-14	0.94 in
2403-12-04	3/4 in	1/4 in	12L14/C1045 Steel	1-1/16-12 x 7/16-20	1-1/8 in
2403-12-06 Steel Male JIC To JIC Adapter	3/4 in	3/8 in	AISI 12L14/C1045 Steel	1-1/16-12 x 9/16-18	1-1/8 in
2403-12-08	3/4 in	1/2 in	12L14/C1045 Steel	3/4-16 x 1-1/16-12	1-1/8 in
2403-12-10	3/4 in	5/8 in	12L14/C1045 Steel	7/8-14 x 1-1/16-12	1-1/8 in
2403-12-12	3/4 in	3/4 in	12L14/C1045 Steel	1-1/16-12	1-1/8 in
2403-14-12 Steel Male JIC To JIC Adapter	7/8 in	3/4 in	AISI 12L14/C1045 Steel	1-3/16-12 x 1-1/16-12	1-1/4
2403-14-14	7/8 in	7/8 in	12L14/C1045 Steel	1-3/16-12	1-1/4
2403-16-08	1 in	1/2 in	12L14/C1045 Steel	1-5/16-12, 3/4-16	1-3/8 in
2403-16-10	1 in	5/8 in	12L14/C1045 Steel	7/8-14 x 1-5/16-12	1-3/8 in
2403-16-12	1 in	3/4 in	12L14/C1045 Steel	1-5/16-12 x 1-1/16-12	1-3/8 in
2403-16-16	1 in	1 in	12L14/C1045 Steel	1-5/16-12	1-3/8 in
2403-20-12	1-1/4 in	3/4 in	12L14/C1045 Steel	1-5/8-12 x 1-1/16-12	1.688 in
2403-20-16	1-1/4 in	1 in	12L14/C1045 Steel	1-5/8-12 x 1-5/16-12	1.688 in
2403-20-20	1-1/4 in	1-1/4 in	12L14/C1045 Steel	1-5/8-12	1.688 in
2403-24-16	1-1/2 in	1 in	12L14/C1045 Steel	1-7/8-12 x 1-5/16-12	2 in
2403-24-20	1-1/2 in	1-1/4 in	12L14/C1045 Steel	1-7/8-12, 1-5/8-12	2 in
2403-24-24	1-1/2 in	1-1/2 in	12L14/C1045 Steel	1-7/8-12	2 in
2403-32-24	2 in	1-1/2 in	12L14/C1045 Steel	2-1/2-12 x 1-7/8-12	2-5/8 in
2403-32-32	2 in	2 in	12L14/C1045 Steel	2-1/2-12	2-5/8 in
2403-48-48	3 in	3 in	12L14/C1045 Steel	3-1/2-12

Product Questions & Answers (1)

Question by: Ralph A on Feb 14, 2026, 3:15 PM

what's the pressure rating on this union, and will it hold up on a system running pretty steady around 6,000 PSI?

Answer by: Customer Support on Feb 16, 2026, 10:27 AM

At 7,500 PSI max dynamic pressure, it's got a solid margin above 6,000 PSI for regular hydraulic system use. That rating covers dynamic conditions, so it's not just a static benchmark. For a system running steady in that range, this union should handle it without issue.

#4 X #3 MJIC UNION

Description & Features

Specifications

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Product Questions & Answers (1)