Description
Brass Brake Adaptor M10 x 1mm Female to M12 x 1mm Male
Solid brass brake adaptor with an M10 x 1mm female thread and an M12 x 1mm male thread. Screws into an M12 x 1 port and accepts an M10 x 1 male union – for example when a replacement master cylinder or valve has the larger port. Supplied by EMS Spares, Leicester – over 30 years in automotive components.
Specification
| Thread A | M10 x 1mm female |
|---|---|
| Thread B | M12 x 1mm male |
| Type | Brake thread adaptor |
| Hex / spanner size | N/A |
| Material / finish | Solid brass, natural finish – rust resistant, will not seize |
| Interchange reference | HU103* |
| EMS part number | EMS-A103 |
* 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: brass thread adaptors explained
What does a brake adaptor do?
A brake adaptor converts one thread to another, so a pipe, hose, switch or gauge with one thread can connect to a port with a different thread – for example when fitting a new master cylinder, valve or gauge.
Step 1 – identify your thread (the most common mistake)
| Thread | Outside diameter (male part) | Threads | Typically found on |
|---|---|---|---|
| M10 x 1mm (this part) | 10mm approx | 1mm pitch (about 25 per inch) | 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) |
| 3/8″ x 24 UNF | 9.5mm approx | 24 per inch | Most British classics: MG, Triumph, Mini, Land Rover Series |
| M12 x 1mm | 12mm approx | 1mm pitch | Larger ports, some master cylinders and 1/4″ pipe |
Tip: Adaptors have two different threads – check both. M10 x 1 and 3/8″ UNF look almost the same, and M12 x 1 can be confused with 1/2″ UNF. Measure each thread and check the pitch with a thread gauge.
Step 2 – which way round?
- This adaptor (EMS-A103): M10 female to M12 male – the port is M12, the pipe union is M10.
- Need the other way (M12 female to M10 male)? See our EMS-A102.
How to fit – good practice
- Identify both threads before you order – measure each one and check the pitch.
- Start each thread by hand for several turns – it should turn freely. If it binds, stop and check the thread.
- Hold the adaptor with one spanner while you tighten the mating part with another, so it does not twist.
- Bleed the system and check every joint 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, 3 or 5 adaptors. 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
Which way round is it? M10 x 1 female on one end, M12 x 1 male on the other. For M12 female to M10 male see EMS-A102.
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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