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Brakequip Fitting - Female3/8NF X 5/8NF EXT. Thread

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Description & Features

Designed for brake line and hydraulic fitting connections, this female-to-female adapter features a 3/8 NF internal thread on one end and a 5/8 NF external thread on the other, allowing two differently threaded lines or components to be joined in a single fitting. The external thread configuration on the 5/8 NF end suits applications where the fitting threads into a port or mating component directly.

The Brakequip Fitting - Female 3/8NF X 5/8NF Ext. Thread is a Brakequip-branded component, suited for use in brake and hydraulic line assemblies where thread conversion between these two sizes is required. With limited additional attribute data available, buyers should confirm thread form compatibility with the mating components prior to installation.

SKU: HFIFX09

Supplier Part Number (MPN): HFIFX09

Specifications

Brand
BrakeQuip®
Connection Type
FPT
Dimensions
46 mm L
Fitting Size
1/2 in
Hex Size
22 mm

Product Questions & Answers (3)

Question by: Daryl H on Apr 6, 2026, 10:41 AM
Will this fitting work to adapt a 3/8" brake line to a 5/8" port?
Answer by: Customer Support on Apr 7, 2026, 1:10 PM
This Brakequip fitting is designed to connect a female 3/8 NF thread to a male 5/8 NF thread, so if your brake line and port match those thread types, it should work.
Question by: Terry M on Jul 25, 2025, 9:13 AM
trying to hook a 3/8 NF brake line to something thats 5/8 NF, is this the right adapter?
Answer by: Customer Support on Jul 27, 2025, 6:54 AM
It’s made for exactly that kind of thread change. One side is a 3/8 NF female (internal) thread, and the other side is a 5/8 NF external thread so you can join mismatched brake or hydraulic connections in one fitting.
Question by: Gene E on Jul 12, 2025, 8:27 PM
What exactly is this fitting doing, thread-wise? Like one end screws into something and the other end receives a line?
Answer by: Customer Support on Jul 14, 2025, 6:38 AM
Pretty much, yeah. One end has a 3/8 NF internal thread, so a brake or hydraulic line with that thread size inserts into it. The other end carries a 5/8 NF external thread, meaning that side threads directly into a port or mating component. It lets you bridge two differently sized threaded connections without needing extra adapters in between.

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