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#4 FP X #2 FP (RIGID) COUPLER

Description & Features

The 04FP-02FP Straight coupler by Brennan Industries Inc offers robust and reliable performance in demanding environments. Constructed from straight steel, this component ensures durability and resistance to wear under high-pressure conditions. The female NPTF thread specifications conform to SAE J476 standards, guaranteeing compatibility and reliable sealing.

With a maximum dynamic pressure rating of 6,000 psi, this coupler is engineered to withstand rigorous applications. The overall length of 1.130 mm and precision threading with B1 and B2 drills of 0.281 mm and 0.188 mm respectively, ensure secure and efficient connections.

The #4 FP X #2 FP (RIGID) COUPLER has thread sizes of 1/4-18 for B1 and 1/8-27 for B2, making it suitable for versatile industrial uses. Its reliable design and construction make it an excellent choice for applications needing robust and efficient performance.

Supplier Part Number: 5000-04-02

Specifications

Brand BRENNAN	Connection Size 1 1/4 in	Connection Size 2 1/8 in	Connection Type FNPT	Connection Type 1 Female SAE NPTF	Connection Type 2 Female SAE NPTF	Dimension Standards SAE J476, SAE J514	Dimensions 1.13 in L	Finish Trivalent Zinc-Plated	Fitting Type Adapter	Hex Size 3/4 in	Material Steel	Material Construction 12L14/C1045 Steel	Maximum Operating Pressure 6000 psi	Series 5000 Series	Thread 2 Drill Dimensions 0.188 in	Thread B1 Drill Dimensions 0.281 in	Thread Size 1/4-18 x 1/8-27

Similar Products

Model Number	Connection Size 1	Connection Size 2	Thread Size	Hex Size
5000-02-02	1/8 in	1/8 in	1/8-27	5/8 in
5000-04-04	1/4 in	1/4 in	1/4-18	3/4 in
5000-06-02 Steel Female NPT Straight Union	3/8 in	1/8 in	3/8-18, 1/8-27	7/8 in
5000-06-04 Steel Female NPT Straight Union	3/8 in	1/4 in	3/8-18 x 1/4-18	7/8 in
5000-06-06	3/8 in	3/8 in	3/8-18	7/8 in
5000-08-04 Steel Female NPT Straight Union	1/2 in	1/4 in	1/2-14 x 1/4-18	1-1/8 in
5000-08-06 Steel Female NPT Straight Union	1/2 in	3/8 in	1/2-14 x 3/8-18	1-1/8 in
5000-08-08	1/2 in	1/2 in	1/2-14	1-1/8 in
5000-12-04	3/4 in	1/4 in	3/4-14, 1/4-18	1-3/8 in
5000-12-06	3/4 in	3/8 in	3/4-14 x 3/8-18	1-3/8 in
5000-12-08 Steel Female NPT Straight Union	3/4 in	1/2 in	3/4-14 x 1/2-14	1-3/8 in
5000-12-12	3/4 in	3/4 in	3/4-14	1-3/8 in
5000-16-08	1 in	1/2 in	1-11-1/2 x 1/2-14	1-5/8
5000-16-12	1 in	3/4 in	1-11-1/2 x 3/4-14	1-5/8
5000-16-16	1 in	1 in	1-11-1/2	1-5/8
5000-20-16	1-1/4 in	1 in	1-1/4-11-1/2 x 1-11-1/2	2 in
5000-20-20	1-1/4 in	1-1/4 in	1-1/4-11-1/2	2 in
5000-24-24	1-1/2 in	1-1/2 in	1-1/2-11-1/2	2.38 in
5000-32-32	2 in	2 in	2-11-1/2	2-7/8 in

Product Questions & Answers (2)

Question by: Neal S on Oct 8, 2025, 5:06 PM

What kind of pressure can this thing handle without blowing apart?

Answer by: Customer Support on Oct 9, 2025, 6:51 PM

This coupler is rated for a maximum dynamic pressure of 6,000 psi, so it should hold up well in high-pressure systems.

Question by: Cody H on Mar 17, 2026, 12:30 PM

Got a 1/8-27 male fitting on one end and a 1/4-18 male on the other, will this coupler work to connect them both up?

Answer by: Customer Support on Mar 18, 2026, 9:59 PM

That's what this part is built for. Both ends are female NPTF, one at 1/4-18 and the other at 1/8-27, so it'll thread onto male fittings of those sizes on each side. Both threads conform to SAE J476, so sealing should be solid as long as your male fittings are cut to the same standard.

#4 FP X #2 FP (RIGID) COUPLER

Description & Features

Specifications

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Product Questions & Answers (2)