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12MP-04FP REDUCER BUSHING

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Description & Features

The 12MP-04FP Reducer Bushing from Brennan Industries Inc is engineered for demanding industrial applications requiring a reliable reduction from a 3/4-14 Male NPTF thread to a 1/4-18 Female NPTF thread. Constructed from high-quality straight steel, this bushing ensures durability and long-lasting performance.

Designed in accordance with SAE J476 specifications, the reducer bushing supports a maximum dynamic pressure of 5,500 Psi. Its overall length measures 1.170 mm, providing a compact yet robust solution for various mechanical systems.

Thread B1 Drill measures at 0.719 mm, and Thread B2 Drill measures 0.281 mm, catering to precise alignment and secure fittings in stringent conditions. This component is a vital addition to your inventory for maintaining optimal functionality.

California Residents: PROP-65 WARNING

Supplier Part Number: 5406-12-04

MPN: 5406-12-04

Specifications

Brand
BRENNAN
Connection Size 1
3/4 in
Connection Size 2
1/4 in
Connection Type
FNPT, MNPT
Connection Type 1
Male SAE NPTF
Connection Type 2
Female SAE NPTF
Dimension Standards
SAE J476, SAE J514
Dimensions
1.17 in L
Finish
Trivalent Zinc-Plated
Fitting Type
Bushing
Hex Size
1-1/8 in
Material
Steel
Material Construction
AISI 12L14/C1045 Steel
Maximum Operating Pressure
6000 psi
Series
5406 Series
Thread 2 Drill Dimensions
0.281 in
Thread B1 Drill Dimensions
0.719 in
Thread Size
3/4-14, 1/4-18

Product Questions & Answers (3)

Question by: Vince M on Jan 13, 2026, 6:50 AM
Got a line running 3/4 NPTF male and need to drop it down to a 1/4 female NPTF port, this bushing do the trick?
Answer by: Customer Support on Jan 15, 2026, 6:02 AM
That's exactly what it's built for. The 5406-12-04 takes a 3/4-14 male NPTF thread on one end and steps it down to a 1/4-18 female NPTF on the other. Both threads meet SAE J476 spec, so you're getting a proper dry-seal fit on both sides, not just a standard pipe thread connection.
Question by: Daryl C on Aug 16, 2025, 2:27 PM
got a 3/4-14 male nptf port and need to step it down to 1/4-18 female nptf. is that what this bushing does?
Answer by: Customer Support on Aug 18, 2025, 6:43 AM
It reduces a 3/4-14 Male NPTF connection down to a 1/4-18 Female NPTF connection, so you can adapt a larger NPTF male thread into a smaller NPTF female thread size.
Question by: Roy R on Apr 16, 2025, 7:51 AM
What kind of pressure can this bushing handle, cause I'm puttin' it in a system that gets a good bit of stress?
Answer by: Customer Support on Apr 17, 2025, 9:57 AM
This reducer bushing is rated for a maximum dynamic pressure of 5,500 Psi, making it suitable for demanding industrial applications.

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