Description
Brass Brake / Clutch Adaptor 7/16″ UNF Male to 3/8″ UNF Female
Solid brass adaptor union with a 7/16″ x 20 UNF male end and a 3/8″ x 24 UNF female end. Used to fit a standard 3/8″ UNF brake pipe union into a 7/16″ UNF port – for example a 7/16″ master cylinder, clutch cylinder or valve on classic British cars and Land Rovers. Supplied by EMS Spares, Leicester.
Specification
| Male end | 7/16″ x 20 UNF |
|---|---|
| Female end | 3/8″ x 24 UNF |
| Type | Brass adaptor union |
| Hex / spanner size | N/A |
| Overall length | N/A |
| Material / finish | Solid brass, natural finish – rust resistant |
| Weight | 50.6g approx |
| Interchange reference | HU108* |
| EMS part number | EMS-A108 |
* 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: brake adaptors explained
What does this adaptor do?
An adaptor joins two different threads in a brake or clutch line – here 7/16″ UNF male to 3/8″ UNF female. Typical use: a 7/16″ UNF port on a master or slave cylinder where you want to run standard 3/16″ pipe with a 3/8″ UNF male union.
Identify both threads
| Thread | Outside diameter (male thread) | Threads | Typically found on |
|---|---|---|---|
| 7/16″ x 20 UNF | 11.1mm approx | 20 per inch | British classics, Land Rover and commercial vehicles, often clutch and 1/4″ pipe circuits |
| 3/8″ x 24 UNF | 9.5mm approx | 24 per inch | Most British classics: MG, Triumph, Mini, Austin, Morris, Land Rover Series, Jaguar, kit cars |
| 3/8″ x 20 BSF | 9.5mm approx | 20 per inch | Older British cars (often pre-1960s) |
| M10 x 1mm | 10mm approx | 1mm pitch (about 25 per inch) | Most European and later cars |
Tip: 3/8″ UNF and M10 x 1 look almost the same and will start to screw in, then bind. Never force a fitting – forcing the wrong thread damages the port. Measure the male thread diameter or use a thread gauge, or compare against your old part.
Male or female?
- Male end: thread on the outside – screws into a port.
- Female end: thread on the inside – takes a male union or male port.
How to fit – good practice
- Check both threads before fitting – compare with your old part or use a thread gauge.
- Start every thread by hand for several turns – it should turn freely. If it binds, stop and check.
- Tighten with correctly sized split (flare nut) spanners. Hold the mating part with a second spanner so pipes do not twist. Brass is softer than steel – firm, not excessive.
- Bleed the system, then check every joint for leaks with the pedal pressed hard.
Safety: brakes and clutches are safety-critical systems. If you are not confident, have the work done or checked by a qualified mechanic.
Pack sizes
1, 3 or 5 adaptors.
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
Is this the reverse of EMS-A109? Yes. A108 = 7/16″ male to 3/8″ female; A109 = 3/8″ male to 7/16″ female.
Need help? Message us with your vehicle and both threads and we will confirm the right adaptor.
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