Product details
Bulldog 580401 5/8in chrome dogbone lock
This Bulldog dogbone receiver lock gives you straightforward, reliable security for your trailer or towing setup. If the thought of someone nicking your coupling keeps you awake, this little lock does the job without alarms or faff. It slips into a standard 5/8in dogbone hitch and locks up with a keyed cylinder — simple as that.
Practical protection for everyday use
Great for weekend runs, long trips or whenever you’ve got a trailer parked outside the house. The chrome plating helps ward off the weather, so it’s less likely to rust if left on the towbar for a spell. It’s light enough to chuck in the toolbox and usually fits without tools in seconds.
Key features and specs
- Fits standard 5/8in dogbone receiver – always double-check your hitch size before buying.
- Chrome finish for basic corrosion resistance and a neat, smart look.
- Key-operated mechanism for dependable security; supplied with keys for straightforward use.
- Compact dimensions: approximately 10.16 x 3.84 x 21.59 cm and weighing about 318 g – small but solid.
- Manufacturer model 580401, OEM part number BGSS580401; country of origin: China.
Who is this for?
Perfect for anyone who tows now and then or regularly and wants a simple physical deterrent. Ideal for casual caravanners, tradespeople who leave trailers on site, or anyone who wants a bit of extra peace of mind when they park up. It won’t replace an alarmed hitch or full immobiliser, but it’s a cost-effective layer of defence.
Things to consider
- Make sure the 5/8in size matches your dogbone hitch — some setups use different pin sizes.
- Chrome is hard-wearing but not indestructible; if you’re on the coast or dealing with heavy salt, consider extra care or a stainless-steel option.
- If you’re unsure whether the lock will fit a non-standard receiver, check the measurements first or ask a local fitter.
Keys can be copied, so keep spares somewhere safe and consider recording the key number if that helps. All in all, the Bulldog 580401 is a practical, no-nonsense way to reduce the chance of theft and stop your trailer being pinched — a small outlay that can put your mind at ease.