# item.guide

Towing & Hitches

6 items

Standardized automotive trailer towing systems: SAE J684 receiver hitch weight classes (Class I to V), tow ball diameters (ISO 1103 50mm vs imperial 2" / 2-5/16"), and trailer electrical harness wiring pinouts (US 7-Blade RV, US 4-Pin Flat, ISO 11446 13-Pin, and ISO 1724 7-Pin).

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ISO 11446 (13-Pin)

7 specs

The ISO 11446 Connector (also known as the Jaeger 13-Pin European standard) is the modern mandatory trailer electrical interface across Europe, the UK, and Australia. Featuring an IP-sealed, waterproof bayonet twist-locking circular housing with 13 gold-plated pin contacts supporting individual left/right lighting circuits, rear fog lamps, reverse lights, and continuous/switched caravan power.

ISO 1724 (7-Pin)

8 specs

The ISO 1724 Connector (commonly known as the European Type 12N 7-Pin plug) is the classical European standard for basic trailer lighting. Featuring a circular 7-pin metal or plastic housing with split brass pins, it provides the essential exterior road lighting circuits (left/right turn, isolated left/right tail lights, brake lights, and rear fog lamp).

Tow Ball Sizes

6 specs

Trailer Tow Balls (standardized globally under ISO 1103 for the 50.0 mm metric standard, and under SAE J684 for North American imperial sizes: 1-7/8", 2.0", 2-5/16", and 3.0") provide the spherical articulated mechanical pivot point between the towing vehicle and trailer coupler.

Trailer Hitch Classes

7 specs

SAE J684 defines the standard classification system for passenger car and light truck receiver hitches in North America. It formally standardizes 4 classes (I–IV) based on receiver square tube opening dimensions (1-1/4", 2.0") and maximum Gross Trailer Weight Rating (GTWR from 2,000 lb up to 10,000 lb) and Tongue Weight (TW); a heavier-duty "Class V" tier is widely marketed by hitch manufacturers but is not itself an SAE J684-defined class.

US 4-Pin Flat Connector

7 specs

The US 4-Pin Flat Connector (standardized under SAE J1239) is the ubiquitous North American electrical plug for light-duty utility trailers, small boat trailers, and snowmobile haulers without electric brakes. Utilizing an inline rubber molded connector with one exposed male pin and three shrouded female sockets.

US 7-Way RV Blade Socket

8 specs

The US 7-Way RV Blade Connector (standardized under SAE J2863) is the primary heavy trailer electrical interface in North America. Encased in a rugged round socket with a spring-loaded weather flap, it provides 7 flat brass blade terminals powering tail lights, turn signals, reverse backup lights, 12V auxiliary battery charging, and proportional electric trailer brakes.