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#6 MP X #6 FP (RIGID) ST.

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Description & Features

BRENNAN Industries Inc offers the #6 MP X #6 FP (Rigid) ST., an integral component designed for industrial applications requiring robust and reliable connections. Constructed from straight steel, this expander guarantees high endurance and performance under maximum dynamic pressure of 6,000 psi.

The product features a male NPTF Thread B1 and a female NPTF Thread B2, both adhering to SAE J476 specification with a thread size of 3/8-18. This ensures compatibility and secure fit in demanding environments. The overall length of 1.440 mm enhances flexibility while maintaining structural integrity.

Meeting stringent industry standards, it provides exceptional resistance and durability. Ideal for environments where pressure integrity and precise thread configuration are crucial, this straight expander is a versatile choice for varied industrial sectors.

MPN: 5405-06-06

Supplier Part Number: 5405-06-06

Specifications

Brand
BRENNAN
Connection Size 1
3/8 in
Connection Size 2
3/8 in
Connection Type
FNPT, MNPT
Connection Type 1
Male SAE 30 deg NPTF
Connection Type 2
Female SAE NPTF
Dimension Standards
SAE J476
Dimensions
1.44 in L
Finish
Trivalent Zinc-Plated
Fitting Type
Expander
Hex Size
7/8 in
Material
Steel
Material Construction
12L14/C1045 Steel
Maximum Operating Pressure
6000 psi
Series
5405 Series
Thread 2 Drill Dimensions
0.406 in
Thread B1 Drill Dimensions
0.406 in
Thread Size
3/8-18

Product Questions & Answers (2)

Question by: Bobby T on Jan 23, 2026, 4:34 PM
got a #6 male pipe thread on one side and need a matching female, is this the straight steel piece that does that
Answer by: Customer Support on Jan 25, 2026, 6:34 AM
For joining a male NPTF to a female NPTF in a straight, rigid connection, this fitting matches that setup. It uses a male NPTF thread on one end and a female NPTF thread on the other, both 3/8-18 per SAE J476.
Question by: Larry B on Apr 7, 2026, 6:08 PM
What kind of threads are on both ends of this fitting, and are they the same size all the way around?
Answer by: Customer Support on Apr 9, 2026, 7:51 AM
Both ends carry 3/8-18 NPTF threads, male on one side and female on the other, both built to SAE J476 spec. So yes, same thread size on each end. The male end threads into a female port, and the female end accepts a male fitting, which is pretty much what you'd expect from a straight expander used to extend or adapt a threaded run.

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