ISO 11446 (13-Pin) vs. Trailer Hitch Classes
Comparing 2 standards across 13 specifications. 13 key differences identified.
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.
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.
Specification Comparison Table
13 Parameters| Parameter / Spec | ||
|---|---|---|
|
Standardization
|
ISO 11446-1 / DIN ISO 11446 (Jaeger 13-Pole System) | SAE J684 / VESC Regulation V-5 |
|
Mechanical Bayonet Lock
|
90-degree twist-to-lock bayonet collar with double silicone perimeter gasket (fully waterproof IP67) | — |
|
Pin 1 & 4 (Indicators)
|
Pin 1: Left Indicator (Yellow) | Pin 4: Right Indicator (Green) | — |
|
Pin 2 & 8 (Fog & Reverse)
|
Pin 2: Rear Fog Lamp (Blue) | Pin 8: Reversing Lights (Pink) | — |
|
Pin 3, 11, 13 (Independent Grounds)
|
Pin 3: Ground for Pins 1-8 | Pin 11: Ground for Pin 10 | Pin 13: Ground for Pin 9 (isolated 2.5 mm² ground returns) | — |
|
Pin 5 & 7 (Isolated Left/Right Tail)
|
Pin 5: Right Side Marker/Tail (Brown) | Pin 7: Left Side Marker/Tail (Black — separate fuses prevent total blackout if one side fails) | — |
|
Pin 9 & 10 (Caravan Power)
|
Pin 9: Permanent +12V unswitched battery feed (Orange) | Pin 10: Switched ignition +12V for caravan 3-way absorption refrigerator (Grey) | — |
|
Class I (Light Duty)
|
— | Receiver: 1-1/4" (31.8 mm) square | Max GTWR: 2,000 lb (907 kg) | Max Tongue Weight: 200 lb (91 kg) — Compact cars and crossovers |
|
Class II (Medium Duty)
|
— | Receiver: 1-1/4" (31.8 mm) square | Max GTWR: 3,500 lb (1,588 kg) | Max Tongue Weight: 350 lb (159 kg) — Midsize sedans, minivans, small crossovers |
|
Class III (The Universal Standard)
|
— | Receiver: 2.0" (50.8 mm) square | SAE J684 baseline GTWR: 5,000 lb (2,268 kg); many commercially sold Class III hitches are manufacturer-rated higher (commonly 6,000–8,000 lb weight-carrying, more with weight distribution) | Max TW: ~500–800 lb — Full-size SUVs and pickup trucks. Actual capacity is always the figure stamped on the hitch itself, not the class name alone |
|
Class IV (Heavy Duty)
|
— | Receiver: 2.0" (50.8 mm) square | SAE J684 baseline GTWR: 10,000 lb (4,536 kg); some commercially sold Class IV hitches are manufacturer-rated up to 12,000–14,000 lb | Max TW: ~1,000–1,400 lb — 1/2-ton and 3/4-ton trucks towing heavy boat/travel trailers. Verify against the hitch's own rating label |
|
Class V (Commercial Extra Heavy)
|
— | Not an official SAE J684 class (SAE J684 formally defines only Classes I–IV) — "Class V" is an aftermarket-industry term for heavier-duty hitches, typically using 2" or 2-1/2" square receivers, marketed with GTWR ratings commonly in the 12,000–20,000+ lb range depending on manufacturer — Heavy duty commercial dually trucks |
|
Tongue Weight Safety Rule
|
— | Tongue weight must be 10% to 15% of total loaded trailer weight to prevent lethal high-speed trailer sway fishtailing |