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#20 MP X #4 FP BUSHING

Description & Features

Constructed from straight steel, this reducer bushing transitions from a 1-1/4-11-1/2 Male NPTF thread to a 1/4-18 Female NPTF thread, making it well-suited for connecting lines of significantly different sizes within hydraulic and industrial fluid systems. Both thread ends conform to SAE J476, ensuring compatibility with standard fittings and assemblies. The #20 MP X #4 FP Bushing is rated for dynamic pressures up to 3,000 PSI, supporting demanding service conditions where a reliable threaded reduction is required.

Manufactured by Brennan Industries, this fitting carries a California Proposition 65 warning for residents of that state. Its compact straight steel body keeps installation straightforward wherever a male-to-female NPTF bushing reduction is needed in a high-pressure hydraulic circuit.

SKU: 5406-20-04

Supplier Part Number (MPN): 5406-20-04

Alternate Part Numbers: A2081-20-4S

Specifications

Brand BRENNAN	Connection Size 1 1-1/4 in	Connection Size 2 1/4 in	Connection Type FNPT, MNPT	Connection Type 1 Male SAE NPTF	Connection Type 2 Female SAE NPTF	Cubic Inch Space L x W x H Dimensions 4.502 cu-in	Dimension Standards SAE J476, SAE J514	Dimensions 1.47 in L	Finish Trivalent Zinc-Plated	Fitting Type Bushing	Hex Size 1-3/4 in	Material Steel	Material Construction AISI 12L14/C1045 Steel	Maximum Operating Pressure 3000 psi	Series 5406 Series	Thread 2 Drill Dimensions 0.281 in	Thread B1 Drill Dimensions 1.142 in	Thread Size 1-1/4-11-1/2 x 1/4-18

Similar Products

Model Number	Connection Size 1	Connection Size 2	Thread Size	Hex Size
5406-04-02	1/4 in	1/8 in	1/4-18 x 1/8-27	5/8 in
5406-06-02	3/8 in	1/8 in	3/8-18, 1/8-27	3/4 in
5406-06-04	3/8 in	1/4 in	3/8-18 x 1/4-18	3/4 in
5406-08-02	1/2 in	1/8 in	1/2-14 x 1/8-27	7/8 in
5406-08-04	1/2 in	1/4 in	1/2-14 x 1/4-18	7/8 in
5406-08-06	1/2 in	3/8 in	1/2-14 x 3/8-18	7/8 in
5406-12-02	3/4 in	1/8 in	3/4-14 x 1/8-27	1-1/8 in
5406-12-04	3/4 in	1/4 in	3/4-14, 1/4-18	1-1/8 in
5406-12-06	3/4 in	3/8 in	3/4-14 x 3/8-18	1-1/8 in
5406-12-08	3/4 in	1/2 in	3/4-14 x 1/2-14	1-1/8 in
5406-16-02	1 in	1/8 in	1-11-1/2 x 1/8-27	1-3/8 in
5406-16-04	1 in	1/4 in	1-11-1/2 x 1/4-18	1-3/8 in
5406-16-06	1 in	3/8 in	1-11-1/2 x 3/8-18	1-3/8 in
5406-16-08	1 in	1/2 in	1-11-1/2 x 1/2-14	1-3/8 in
5406-16-12	1 in	3/4 in	1-11-1/2 x 3/4-14	1-3/8 in
5406-20-06	1-1/4 in	3/8 in	1-1/4-11-1/2 x 3/8-18	1-3/4 in
5406-20-08 Steel NPT Bushing Adapter	1-1/4 in	1/2 in	1-1/4-11-1/2 x 1/2-14	1-3/4 in
5406-20-12	1-1/4 in	3/4 in	1-1/4-11-1/2 x 3/4-14	1-3/4 in
5406-20-16	1-1/4 in	1 in	1-1/4-11-1/2 x 1-11-1/2	1-3/4 in
5406-24-04	1-1/2 in	1/4 in	1-1/2-11-1/2 x 1/4-18	2 in
5406-24-06 Steel NPT Bushing Adapter	1-1/2 in	3/8 in	1-1/2-11-1/2 x 3/8-18	2 in
5406-24-08	1-1/2 in	1/2 in	1-1/2-11-1/2 x 1/2-14	2 in
5406-24-12	1-1/2 in	3/4 in	1-1/2-11-1/2 x 3/4-14	2 in
5406-24-16	1-1/2 in	1 in	1-1/2-11-1/2 x 1-11-1/2	2 in
5406-24-20	1-1/2 in	1-1/4 in	1-1/4-11-1/2, 1-1/2-11-1/2	2 in
5406-32-06	2 in	3/8 in	2-11-1/2 x 3/8-18	2-1/2 in
5406-32-08	2 in	1/2 in	2-11-1/2 x 1/2-14	2-1/2 in
5406-32-12	2 in	3/4 in	2-11-1/2 x 3/4-14	2-1/2 in
5406-32-16	2 in	1 in	2-11-1/2, 1-11-1/2	2-1/2 in
5406-32-20	2 in	1-1/4 in	2-11-1/2 x 1-1/4-11-1/2	2-1/2 in
5406-32-24	2 in	1-1/2 in	2-11-1/2, 1-1/2-11-1/2	2-1/2 in
5406-40-32	2-1/2 in	2 in	2-1/2-8 x 2-11-1/2	3 in
5406-48-32	3 in	2 in	3-8 x 2-11-1/2

Product Questions & Answers (1)

Question by: Cody G on Mar 11, 2026, 5:17 PM

What's the highest pressure this bushing can handle without giving out?

Answer by: Customer Support on Mar 13, 2026, 2:16 PM

This reducer bushing is rated to withstand dynamic pressures up to 3,000 PSI, which should support most demanding hydraulic applications where a reliable threaded reduction is needed.

#20 MP X #4 FP BUSHING

Description & Features

Specifications

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Product Questions & Answers (1)