3500kg Alko Marine Trailer Coupling.
Standard Australian Hole spacing is 182.5mm x 55mm – 4 x 13.5mm holes.
The Al-ko marine coupling complies with Australian Standard 4177.3
The Marine Coupling is 3500kg Rated with 1/2 inch BSW ball adjusting nut.
The adjustment nut on the head of the coupling is a 1/2″ BSW thread.
This nut prevents the Marine Coupling jumping on the tow-ball and creates and tight fit by removing slop that can occur through wear,
To properly adjust this nut
- Put pressure on the Marine Coupling head so that it is firmly on the tow-ball.
- Loosen the nut.
- Screw down the thread so that you can feel it touch the top of the tow ball.
- Now tighten the locking nut being careful not to unscrew the threaded screw.
One final thing, your coupling weight when attached to
- Tandem trailer should be around 5% to 7% of your total load.
- Single Axle trailer should be 7% to 10% of your total load.
Your coupling should now be tight and ready to tow.
- BALL COUPLINGS
2.1. ‘Ball Couplings’ intended for towing trailers up to 3.5 tonnes ‘ATM’ must comply with Australian Standard 4177.2 – 1994 “50 mm Towballs” or as amended from time to time.
- COUPLING BODIES FOR BALL COUPLINGS
3.1. The coupling body of a 50 mm ‘Ball Coupling’ intended for trailers up to 3.5 tonnes ‘ATM’ must comply with Australian Standard 4177.3 – 1994 “Coupling Body for Ball Couplings” or as amended from time to time.
Sure, there are cheaper couplings on the market. We buy and recommend only the best products for your investment dollar.
In my opinion, a lot of trailer and caravan accidents are caused by u-bolts that have never had their final adjustment. Check your nuts, you may be surprised.