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#8 MP X #4 FP

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Description & Features

Manufactured from straight steel, this straight expander fitting steps up from a #4 female NPTF port to a #8 male NPTF connection in a single inline body. Both threads conform to SAE J476, with the male end sized at 1/2-14 and the female end at 1/4-18. The #8 MP X #4 FP is rated for dynamic pressures up to 6,000 PSI, making it well suited for hydraulic and fluid power circuits where a compact, permanent thread expansion is needed without additional adapters.

Supplied by Brennan Industries under their 5405 Series, this fitting carries a California Proposition 65 warning for applicable buyers. The straight configuration keeps the assembly compact where space between ports is limited.

SKU: 5405-08-04

Supplier Part Number (MPN): 5405-08-04

Specifications

Brand
BRENNAN
Connection Size 1
1/2 in
Connection Size 2
1/4 in
Connection Type
FNPT, MNPT
Connection Type 1
Male SAE 30 deg NPTF
Connection Type 2
Female SAE NPTF
Dimension Standards
SAE J476
Dimensions
1.64 in L
Finish
Trivalent Zinc-Plated
Fitting Type
Expander
Hex Size
7/8 in
Material
Steel
Material Construction
12L14/C1045 Steel
Maximum Operating Pressure
5000 psi
Series
5405 Series
Thread 2 Drill Dimensions
0.281 in
Thread B1 Drill Dimensions
0.531 in
Thread Size
1/2-14 x 1/4-18

Product Questions & Answers (3)

Question by: Ronnie B on Feb 9, 2026, 8:42 PM
Got a port on a manifold block that's tapped 1/4-18 NPTF and I need to run a 1/2-14 male line into it. This fitting do that in one shot, or am I still gonna need extra pieces?
Answer by: Customer Support on Feb 11, 2026, 4:03 PM
One fitting handles it. The female end threads into your 1/4-18 NPTF port and the male end puts out a 1/2-14 NPTF connection, so you go straight from the smaller port to the larger line without stacking adapters. Both ends conform to SAE J476, and the whole thing sits in a single inline body, which keeps things tight in spots where you don't have room to chain fittings together.
Question by: Gene A on Jun 14, 2025, 9:56 PM
got a 1/4-18 female NPTF port and need to step it up to 1/2-14 male NPTF in-line. is that what this fitting does?
Answer by: Customer Support on Jun 16, 2025, 7:31 PM
In plain terms, it is a straight expander that goes from a #4 female NPTF (1/4-18) on one side to a #8 male NPTF (1/2-14) on the other, all in one inline steel body. Both ends are NPTF threads built to SAE J476.
Question by: Wade C on Apr 15, 2025, 12:03 PM
So this fitting goes from a 1/4 inch female to a 1/2 inch male pipe thread, right? Just want to make sure I'm reading it right.
Answer by: Customer Support on Apr 17, 2025, 6:57 AM
That's correct. It expands from a #4 female NPTF (1/4-18 thread) to a #8 male NPTF (1/2-14 thread) connection.

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