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#16 X #12 MJIC UNION

Description & Features

The 16MJ-12MJ Straight connector from Brennan Industries Inc. is designed for secure and reliable connections in high-pressure environments. This straight steel union belongs to the 2403 series and features a maximum dynamic pressure capacity of 4 000 psi.

It has a compact design with an overall length of 2.200 mm making it suitable for tight spaces without sacrificing performance. The male JIC SAE 37-degree flare threads conforming to SAE J514 specifications provide a robust connection with thread size B1 of 1-5/16-12 and thread size B2 of 1-1/16-12.

Both ends of the union are drilled to precise dimensions with thread drill B1 at 0.844 mm and thread drill B2 at 0.609 mm. This ensures a consistent fit and optimal performance.

California Residents: PROP-65 WARNING

MPN: 2403-16-12

Supplier Part Number: 2403-16-12

Specifications

Brand BRENNAN	Connection Size 1 1 in	Connection Size 2 3/4 in	Connection Type Male JIC	Connection Type 1 Male SAE 37 deg JIC Flare	Connection Type 2 Male SAE 37 deg JIC Flare	Cubic Inch Space L x W x H Dimensions 4.159 cu-in	Dimension Standards SAE J514	Dimensions 2.2 in L	Finish Trivalent Zinc-Plated	Fitting Type Adapter	Hex Size 1-3/8 in	Material Steel	Material Construction 12L14/C1045 Steel	Maximum Operating Pressure 4000 psi	Series 2403 Series	Thread 2 Drill Dimensions 0.609 in	Thread B1 Drill Dimensions 0.844 in	Thread Size 1-5/16-12 x 1-1/16-12

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
2403-04-03	1/4 in	3/16 in	12L14/C1045 Steel	7/16-20 x 3/8-24	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
2403-16-16	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 (3)

Question by: Harvey H on Oct 31, 2025, 11:11 AM

Will this union handle 4000 psi okay?

Answer by: Customer Support on Nov 2, 2025, 9:01 AM

It's designed to handle a maximum dynamic pressure of 4,000 psi, according to the specs. So you should be good to go.

Question by: Roger H on Jan 15, 2026, 1:11 PM

trying to step down from a #16 JIC to a #12 JIC, is that what this union does?

Answer by: Customer Support on Jan 16, 2026, 8:19 PM

Function-wise, it is a straight steel union with a male JIC 37 degree flare on both ends, sized #16 on one side and #12 on the other. The thread sizes are 1-5/16-12 (B1) and 1-1/16-12 (B2), both to SAE J514.

Question by: Cindy T on May 16, 2025, 5:58 PM

Got a #16 hose end on one side and a #12 on the other, this union gonna work for that kind of reducer setup?

Answer by: Customer Support on May 18, 2025, 6:06 AM

Both ends of this union are male JIC, so it won't work as a reducer between mismatched hose ends. One side is 1-5/16-12 thread and the other is 1-1/16-12 thread, but both are male JIC SAE 37-degree flare fittings. You'd need a female JIC fitting on whatever you're connecting to on each end. If your hose ends are already female JIC, then yes, this bridges a #16 port to a #12 port in a straight inline run just fine.

#16 X #12 MJIC UNION

Description & Features

Specifications

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Product Questions & Answers (3)