Bulldog 580401
Chrome dogbone receiver hitch lock
Chrome finish; keyed dogbone
View the matching listingIdentify Bulldog Hitch Receiver and Coupler Locks by MPN
Bulldog Lifelong locks are sold in several configurations for trailer receivers and trailer coupler latches. Identifying a replacement starts with where the old lock fits. A dogbone receiver pin, a small coupler-latch lock and a two-lock combination set are different products—even when they share the same silver finish or keyed design. Use the complete Bulldog number to compare the six models listed here.
Look at the locking location first
Receiver hitch pins580401 and 580402 secure a compatible ball mount or other accessory inside a 2-inch square receiver. Both use 5/8-inch-diameter keyed dogbone pins. 580401 is chrome-plated; 580402 is stainless.
Trailer coupler latch pins580403 and 580408 are much smaller coupler-latch locks, with 1/4-inch pins. They lock suitable latch hardware, not the receiver pin hole. 580403 has a chrome finish and 580408 has stainless-steel construction.
Sleeved and combination models580405 is a stainless receiver lock listed with a removable sleeve for supported 1¼- and 2-inch receiver arrangements. 580406 adds a separate coupler-lock component. Check the full kit and the correct sleeve instructions.
Bulldog lock part-number chart
| Bulldog number | Part type | Fits at | Check before selecting |
|---|---|---|---|
| 580401 | Receiver lock | 2-inch square receiver | 5/8-inch pin |
| 580402 | Receiver lock | 2-inch square receiver | 5/8-inch pin |
| 580403 | Coupler lock | Compatible coupler latch | 1/4-inch pin |
| 580408 | Coupler lock | Compatible coupler latch | 1/4-inch pin |
| 580405 | Receiver lock | Compatible 1¼- and 2-inch receivers; verify sleeve | Verify pin and sleeve position |
| 580406 | Combination set | Receiver plus compatible trailer coupler | Verify both receiver and coupler pin fit |
Don't rely on a short product title. Some 580405 and 580406 listings describe only a 5/8-inch receiver locking pin. The manufacturer's product descriptions distinguish the sleeve-equipped 580405 from the 580406 receiver-and-coupler combination. Compare the actual package contents and required pin diameter with the complete Bulldog MPN before purchase.
What should match the original lock?
- Mounting point. Determine whether the lock is replacing the hitch-pin connection at the vehicle or the separate latch pin on the trailer coupler.
- Pin-hole diameter. The 580401/580402 dogbone receiver locks are listed with 5/8-inch pins for compatible 2-inch square receivers. The coupler-latch models have 1/4-inch pins. Sleeved models require their specified sleeve configuration.
- Locking span. A pin must reach through both receiver walls and the accessory shank while allowing the keyed end to engage. For a coupler, verify clearance around the latch before locking.
- Required pieces. If only the tow-vehicle receiver needs a lock, compare the stand-alone receiver items. If you need a receiver lock and a coupler lock, check 580406's combination packaging.
- Materials and condition. Stainless and chrome-plated models offer different finishes. Inspect used locks for corrosion, a bent shaft, worn key mechanism or a damaged dust cap. Do not use a lock that does not engage positively.
A coupler latch lock is not an entire trailer security system
These locks help deter unauthorized removal of a receiver accessory or opening of a compatible coupler latch. They do not alter the hitch's weight rating, prevent every theft method or replace the properly seated coupler, safety chains, breakaway cable and other required towing connections. Check all towing equipment separately.
Find the exact Bulldog lock listing
Each card links to UsedRVParts.ca. Check the stated condition and current availability for each product. This store offers new products as well as used parts, with viewing or pickup of eligible used inventory by appointment in Kelowna.
Bulldog 580402
Stainless dogbone receiver hitch lock
Stainless-steel construction
View the matching listing
Bulldog 580405
Stainless receiver lock with adapter sleeve
Sleeved configuration for different receiver sizes
View the matching listing
Bulldog 580406
Stainless receiver/coupler lock set
Receiver lock and separate coupler lock
View the matching listingRelated trailer jack parts
For Bulldog jack repair components rather than security locks, see our Bulldog trailer jack replacement-parts reference. Jack retaining hardware and hitch security locks serve different purposes.
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