Heavy-duty trailer hitch receiver lock for compatible 3" receiver applications, using a 5/8" stainless steel locking pin with a 3-5/8" span for securing ball mounts and hitch-mounted accessories.
The InfiniteRule 61073-S trailer hitch receiver lock is designed for compatible 3" receiver applications that require a 5/8" locking hitch pin with a longer span. It helps secure a ball mount, drawbar, or compatible hitch-mounted accessory in the receiver to help deter theft and tampering.
This lock is best suited for larger receiver setups where a standard 2" or 2.5" receiver lock may not provide enough span. The stainless steel construction, flush-style lock design, O-ring protection, and weather-resistant dust cap help support long-term use in towing and outdoor conditions.
Designed for compatible 3" trailer hitch receiver applications
Common heavy-duty hitch pin size for many receiver accessories
Longer usable span helps fit wider 3" receiver setups
Corrosion-resistant construction for towing and outdoor exposure
This lock is intended for compatible 3" trailer hitch receivers that use a 5/8" hitch pin and require a 3-5/8" usable span. Do not order by receiver size alone. Verify the receiver size, pin hole diameter, accessory shank width, receiver wall thickness, required pin span, reducer sleeve use, and lock-head clearance before ordering.
Before Starting: Confirm the receiver and hitch accessory both use a 5/8" pin hole and that the 3-5/8" span is correct for the receiver/accessory combination. Inspect the hitch pin holes for damage, rust, deformation, or misalignment before use. Basic Use Steps: 1. Insert Accessory: Slide the compatible ball mount or hitch accessory fully into the 3" receiver tube. 2. Align Pin Holes: Align the receiver and accessory hitch pin holes. 3. Separate Lock Head: Use the key to separate the lock head from the pin by rotating counterclockwise, following InfiniteRule’s instructions. 4. Insert Locking Pin: Slide the 5/8" locking pin through the aligned holes. 5. Install Lock Head: Rotate the lock housing and pin until the internal squares align and the two halves drop together. 6. Tighten Carefully: Rotate the key clockwise until the lock contacts the O-ring, then align as directed. Do not overtighten. 7. Install Dust Cap: Seat the dust cap to help protect the keyway from water, dirt, and road grime. 8. Inspect Before Towing: Confirm the accessory is fully seated, locked, and compatible with the towing setup before travel.
Package Contents: • 1 InfiniteRule 61073-S trailer hitch receiver lock • 5/8" stainless steel locking pin with 3-5/8" span • Locking end / lock cylinder assembly • Weather-resistant dust cap • Keys as supplied by manufacturer or distributor packaging NOT Included — May Also Need: • Trailer hitch receiver • Ball mount or drawbar • Hitch ball • Receiver reducer sleeve or adapter • Anti-rattle device • Coupler lock or trailer tongue lock • Safety chains, wiring, or towing hardware This listing is for the receiver lock only unless otherwise stated. Confirm your receiver size, pin hole diameter, required span, and hitch accessory fitment before ordering.
To confirm compatibility before ordering, have the following ready: • Receiver size, especially whether it is a true 3" receiver • Hitch pin hole diameter • Required pin span across the receiver/accessory combination • Accessory type, such as ball mount, bike rack, cargo carrier, or weight distribution shank • Receiver wall thickness and collar style • Whether a reducer sleeve or adapter is being used • Clearance around the receiver for the lock head, key access, and dust cap Why this matters: Receiver locks can share the same 5/8" pin diameter but differ in usable span, receiver fit, lock-head clearance, and accessory compatibility.
Match this lock by receiver size, pin diameter, usable span, accessory width, reducer sleeve use, and lock-head clearance. Do not select by receiver size alone.
If fitment or locking issues continue, check receiver size, pin hole diameter, usable span, lock head clearance, accessory alignment, reducer sleeve use, thread condition, and key/cylinder operation before replacing additional towing parts.
Always confirm the receiver lock, hitch receiver, ball mount, hitch ball, trailer, and towing vehicle are properly rated and compatible for the towing setup. A receiver lock helps secure the accessory to the receiver, but it does not increase hitch capacity, correct an overloaded trailer, replace safety chains, or fix an improperly matched towing system. Inspect the lock before each trip and do not tow with damaged, mis-sized, loose, or improperly installed towing hardware.