Description
Stainless Steel Inline Brake Pipe Connector 3/8″ UNF Male to Male
Stainless steel inline brake pipe connector (double male joiner) with a 3/8″ x 24 UNF male thread at each end (32.5mm long approx), for joining two 3/16″ pipes fitted with 3/8″ UNF female unions. Supplied by EMS Spares, Leicester – over 30 years in automotive components.
Specification
| Thread | 3/8″ x 24 UNF male both ends |
|---|---|
| Pipe size | 3/16″ (4.75mm) |
| Type | Inline connector, male to male |
| Hex / spanner size | 11mm A/F approx |
| Overall length | 32.5mm approx |
| Material / finish | Stainless steel, natural bright finish – rust resistant |
| Interchange reference | HU23* (brass equivalent) |
| EMS part number | EMS-A23SS |
* Reference numbers are for identification and cross-reference only. EMS Spares is an independent UK supplier and has no connection with the owners of these part numbers. All dimensions are approximate.
Buyer’s guide: stainless inline brake connectors explained
Why stainless steel?
Stainless steel fittings resist rust and road salt, keep a clean bright finish and are harder than brass, so the hex is less likely to round off. They are popular on restorations, show cars, kit cars and vehicles used all year round. Brass is softer and seals very easily; stainless is tougher and longer-lasting – both work with copper-nickel (Kunifer), copper and steel brake pipe.
What does an inline connector do?
An inline connector (joiner) links two brake pipes in a straight line – to repair a damaged section, extend a pipe, or join a new pipe to an old one. Each pipe carries its own union and flare, which seal against the connector.
Step 1 – identify your thread (the most common mistake)
| Thread | Outside diameter (male part) | Threads | Typically found on |
|---|---|---|---|
| 3/8″ x 24 UNF (this part) | 9.5mm approx | 24 per inch | Most British classics: MG, Triumph, Mini, Land Rover Series, Jaguar, kit cars |
| 7/16″ x 20 UNF | 11.1mm approx | 20 per inch | Larger British ports, some master cylinders and 1/4″ pipe |
| M10 x 1mm | 10mm approx | 1mm pitch | Most European and Japanese cars, many later British cars and kit cars |
| M10 x 1.25mm | 10mm approx | 1.25mm pitch | Some older Italian and French cars (e.g. Fiat, Lancia) |
| M12 x 1mm | 12mm approx | 1mm pitch | Larger metric ports and 1/4″ pipe |
Tip: 3/8″ UNF and M10 x 1 look almost the same and will start to screw together, then bind. Never force a fitting. Measure the male thread and check the pitch with a thread gauge.
Step 2 – male or female connector?
- Male to male: both pipes carry female unions (EMS-A1ASS) (this part)
- Female to female joiner – see our our brass EMS-A20.
Step 3 – pipe size and flare
For 3/16″ (4.75mm) outside-diameter pipe, the standard UK car brake pipe size. Suits copper-nickel (Kunifer), copper and steel brake pipe.
How to fit – good practice
- Cut out the damaged section and prepare both pipe ends square and burr-free.
- Fit the correct unions on each pipe before flaring, then flare both ends.
- Start each union into (or onto) the connector by hand, then tighten while holding the connector with a second spanner.
- Clip the pipe so the joint cannot vibrate, then bleed and check for leaks.
Safety: brakes are a safety-critical system. If you are not confident, have the work done or checked by a qualified mechanic.
Pack sizes
Available as 1, 2, 3, 5 or 10 connectors. Larger packs cost less per piece.
Delivery
Free UK delivery on every order (including Northern Ireland, Highlands & Islands). Same-day dispatch on orders placed before 10am.
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FAQ
Will stainless fit my existing brass fittings? Yes – the thread and seat are the same, so a stainless union screws into the same port as a brass one.
Will it rust? Stainless steel resists rust and road salt and keeps its bright finish.
Need help? Message us with your vehicle and the part you are connecting to and we will confirm the right fitting before you order.
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