InfiniteRule Hitch Locks: Receiver vs B&W Tow & Stow

Two locking pins can have the same ⅝-inch diameter but still serve different locations. A vehicle receiver may need a shorter clear lock span, while an adjustable hitch ball mount may require a longer pin between its side plates. InfiniteRule makes application-specific stainless-steel locks for both. Compare the six models below before buying a single replacement or a keyed-alike set.

Where does the locking pin go?

Vehicle receiver connectionThe pin passes through the vehicle's receiver and the inserted hitch shank. The general-use 61072-S is listed for compatible 2- and 2½-inch receivers with a 3⅛-inch clear lock span. The 61073-S provides a 3⅝-inch span for compatible 3-inch receivers. Toyota-specific 61194-S has a different 3⅞-inch span for listed 2024-and-newer OEM Tacoma and Land Cruiser receiver applications.
Adjustable B&W ball mountThe 61075-S secures a specified B&W Tow & Stow adjustable ball-mount position with its 4⅛-inch span. It is not a lock for the vehicle's receiver. The three-lock 61675-S covers the listed adjustable-mount positions only, while the mixed four-lock 61775-S also includes a separately sized 2½-inch receiver lock.

Compare InfiniteRule hitch and receiver locks

MPN Application Diameter Clear span Quantity
61072-S Receiver ⅝″ 3⅛″ 1 lock
61073-S Receiver ⅝″ 3⅝″ 1 lock
61194-S Receiver ⅝″ 3⅞″ 1 lock
61075-S Adjustable mount ⅝″ 4⅛″ 1 lock
61675-S Adjustable mount ⅝″ 4⅛″ 3 keyed-alike locks
61775-S Mount + receiver ⅝″ 4⅛″ + 3⅛″ 4 keyed-alike locks
One ⅝-inch pin does not fit every ⅝-inch hitch hole. Receiver size, wall thickness, adjustable-hitch side plates and the required lock-head clearance determine the needed pin span. A 4⅛-inch B&W ball-mount lock cannot be assumed suitable for the receiver—even when the pin diameter matches. Confirm the exact hitch model, receiver and clearance with InfiniteRule's application information.

What is included in the Tow & Stow lock sets?

61075-S is one lock for listed B&W 2- and 2½-inch Tow & Stow 10,000 lb and 18,000 lb adjustable ball mounts. 61675-S contains three keyed-alike locks for the adjustable mount, but does not add a receiver lock. 61775-S contains four keyed-alike locks: three for the B&W adjustable mount and one with the 3⅛-inch span specified for a compatible 2½-inch vehicle receiver.

The individual 61072-S, 61073-S and 61194-S each provide one receiver lock. The machined stainless-steel locks use keyed heads and protective caps, but keys from separately ordered packages should not be assumed to match without confirmed keying information.

What about towing capacity?

InfiniteRule publishes third-party testing ratings for its locking pins. Those ratings are specific to the locks and do not increase the capacity of the hitch ball, shank, vehicle receiver or trailer. Follow the lowest applicable rating in the complete towing system and the vehicle manufacturer's towing instructions.

Check these measurements before ordering

  1. Record the full hitch model and receiver class. A 2-inch, 2½-inch and 3-inch receiver may require different pin spans. Confirm unusual OEM receiver designs separately.
  2. Identify the pin location. Determine whether you are locking the vehicle's receiver connection or the adjustable ball-mount hardware; the required reach can differ.
  3. Measure the clear span needed. Check the total width between the lock-head contact points, including hitch side plates. Choose a confirmed manufacturer's fit, not simply the nearest pin length.
  4. Verify pin diameter. These selected models have ⅝-inch pins, but other hitch components use different diameters. Never force a mismatched pin.
  5. Check keying and number of locks. Select a single, the three-lock mount-only set or the four-lock mixed set based on how many connections you want secured.
  6. Inspect fit after installation. Ensure full lock engagement and clearance from trailer wiring, chains and moving parts; follow the lock and hitch manufacturer's instructions.

Shop InfiniteRule locks by exact MPN

The cards below link directly to the matching NewRVParts products. Orders ship from supplier warehouses; warehouse viewing and pickup are not available. Check the exact listing for current availability.

Other receiver-pin types

For a comparison with non-locking hitch pins and clip styles, see our CURT receiver hitch pin size and lock guide. Match the exact pin design to the intended application rather than treating different manufacturers' locks as direct replacements.

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