Elevate Automotive

7 Pin Flat Metal Trailer Socket — Die-Cast AS 4177.5

Name: 7 Pin Flat Metal Trailer Socket — Die-Cast AS 4177.5
Brand: Elevate Automotive
SKU: BTC-7S
Price: 10.00 AUD
Availability: InStock

BTC-7S

Die-cast metal 7-pin flat trailer socket, AS 4177.5, 15A per pole at 12V, screw terminals.

Format7-pin flat

Current15A/pole · 12V DC

StandardAS 4177.5

$10.00

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Universal fitment7-pin flat (AS 4177.5) tow-vehicle-side socket for most light-duty AU trailers

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A die-cast metal 7-pin flat trailer socket that mounts to the tow vehicle and connects the trailer's tail, stop, turn, reverse and brake circuits in one keyed fitting. Carries 15A per pole at 12V so it suits most light-duty towing: box trailers, car carriers, boat trailers, horse floats and small caravans wired to the AS 4177.5 flat pattern. Backs onto screw terminals so you can wire it in with standard trailer cable and tape or solder as you prefer.

The housing is die-cast metal with a sprung weather lid that stays shut over the pins when nothing is plugged in. Inside, seven brass or nickel-plated brass contacts take screw terminals from the rear so you can land each core on its own labelled position. Overall footprint is about 80 by 55mm by 30mm deep, with mounting holes for an external bracket or a flat chassis mount.

Pin 3 is the earth on the AS 4177.5 flat pattern (white wire, not black or green). Wiring pin 2 (black) or pin 4 (green) as earth puts voltage onto a signal line and burns out globes or trailer-plug LEDs. Fuse each supply circuit at the vehicle end, not at the socket, and use at least 2.5mm² cable on the brake and earth cores if the trailer is running electric brakes.

Related in our range

7 Pin Flat Metal Trailer Plug — Die-Cast AS 4177.5

$12.50

7 Pin Large Round Metal Trailer Socket — Die-Cast AS2513

$22.00

Die-cast metal body — stands up to road grit and spray
Sprung weather lid — closes over the pins when unplugged
15A per pole at 12V — covers tails, brakes, stop and turn
Brass screw terminals — accept standard trailer cable, no crimper needed
AS 4177.5 pattern — matches the common AU 7-pin flat plug

Electrical

Current: 15A/pole

Voltage: 12V DC

Max voltage: 32V DC

Standard: AS 4177.5

ADR: 42/04

Pin count: 7

Dimensions

Length: ~80mm

Width: ~55mm

Depth: ~30mm

Weight: 0.15 kg

Materials

Housing: Die-cast metal

Contacts: Brass

Lid: Sprung metal

Terminals: 7 screw

Length: 80mm

Width: 55mm

Height: 30mm

Weight: 0.15kg

7-pin flat (AS 4177.5) tow-vehicle-side socket for most light-duty AU trailers

Fits trailers wired to the 7-pin flat AS 4177.5 pattern: box trailers, car carriers, boat trailers, horse floats, small caravans

Works on 12V DC systems; rated 15A per pole

Not for AS 2513 large-round plugs (use the large round socket)

Not for small round metal plugs (different pin pattern)

Not for ISO 1724 European 7-pin flat; pin 5 is a handbrake sensor on the EU pattern, not AU, and wiring to AU convention damages EU-pattern wiring

Q: What does "7-pin flat" actually mean?
It is the small rectangular Australian trailer plug with seven brass pins in two staggered rows. The flat pattern is the most common one on light-duty trailers (box trailers, car carriers, small boat trailers). "Flat" refers to the physical shape of the pin array, not the socket housing shape.

Q: What is the pin assignment on the AS 4177.5 flat pattern?
Pin 1 (yellow) is the left turn signal; pin 2 (black) is reversing lights; pin 3 (white) is EARTH; pin 4 (green) is the right turn signal; pin 5 (blue) is electric brakes; pin 6 (red) is stop lamps; pin 7 (brown) is tail, clearance and marker lamps. Note that white is earth, not black or green.

Q: How much current can each pin handle?
Rated 15A per pole at 12V. That covers tail and marker lights, stop lamps, turn signals and typical trailer brake controllers. Winches, high-current fridges and inverters do not belong on trailer-connector pins; those need their own Anderson or direct battery feed with a proper fuse.

Q: How is this different from the large round socket?
The large round pattern (AS 2513) uses 7 round pins arranged in a circle and is rated to 30A per pole. The flat pattern (AS 4177.5) uses 7 blade pins and is rated to 15A per pole. The two are physically incompatible; plug and socket must match. The matching large-round socket is here: [7-pin-large-round-metal-trailer-socket].

Q: Can I use this for a European caravan with a 7-pin flat?
No. The European ISO 1724 7-pin flat uses the same physical connector but a different pin assignment: pin 5 on ISO 1724 is a handbrake sensor, not electric brakes. Wiring an EU-pattern trailer to the AU convention burns out circuits. If the trailer is wired to ISO 1724, use a 7-to-13-pin EU adaptor or rewire to AU convention.

Q: What size cable should I use?
2.5mm² is the sensible minimum for AU trailer wiring. Earth and brake cores often go up to 4mm² on heavier trailers or long runs. 1mm² is too light for anything beyond short tail and marker runs.

Q: Does this fit a trailer with electric brakes?
Yes. Pin 5 on the AS 4177.5 flat pattern carries the brake controller output. Wire pin 5 to the trailer brake magnets through 2.5mm² or 4mm² cable depending on trailer axle count. Use the matching plug on the trailer end: [flat-trailer-connector-plug-7pin].

Q: How do I mount it to the tow vehicle?
It bolts through two mounting holes on the housing to an external bracket or a flat chassis panel. Many tow-bar makers sell a Z-shaped bracket that holds the socket just under the rear bar. Mount it with the sprung lid facing down so water runs off instead of pooling inside.

Q: Is it weatherproof?
The sprung metal lid closes over the pins when the plug is out, keeping dust and spray off the contacts. It is not fully sealed to IP67, so submersion is not covered. Boat trailer owners who regularly dunk the socket should use a dedicated waterproof version or a sealed cover.

Q: What else might I need?
The matching plug for the trailer end: [flat-trailer-connector-plug-7pin]. If the trailer is wired to the AS 2513 large round pattern instead, use the [7-pin-large-round-metal-trailer-socket]. For small round pattern trailers, use the [trailer-connector-7-pin-small-round-metal-socket].

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