When an RV exterior hatch no longer latches, first identify whether it uses a keyed cam lock or a plastic thumb-turn latch. B&B Molders supplies separate 751-key and 391-key cam families, with different nominal cam sizes, plus white and black keyless thumb locks. Selecting by colour or the hatch's outside width alone is not enough.
Keyed cam versus keyless thumb lock
A keyed cam turns an internal retaining blade with a matching key. A thumb-turn uses an external rotating handle without a key. Match both the style and the existing fastening arrangement.
751-key cam
94150 or 94151 keyed cams; 94152 replacement keys.
391-key cam
94153 keyed cam; 94155 matching replacement key.
Thumb-turn latch
94156 white or 94157 black keyless locks.
Which B&B hatch-lock part number do you have?
| MPN | Manufacturer classification | What to compare |
|---|---|---|
| 94150 | 5/8-inch cam, 751 key | 751 key code and 5/8-inch nominal cam selection |
| 94151 | 1⅛-inch cam, 751 key | 751 key code and longer nominal cam selection |
| 94152 | Replacement CH751 keys | A key-only part; catalogued as a two-key set |
| 94153 | 5/8-inch cam, 391 key | 391 key code and lock size |
| 94155 | Replacement CH391 key | One key; not a cam-lock kit |
| 94156 / 94157 | Plastic thumb lock; white / black | Keyless configuration and hatch clearance |
B&B also identifies 94154 as a 1⅛-inch cam with a 391-code key. It is a separate manufacturer part; this page does not present a matched NewRVParts listing for it.
751-key cam locks and replacement keys
The 94150 and 94151 are both 751-key cam locks, but B&B lists different nominal sizes. Compare the complete old cylinder and retaining cam, including panel thickness and the original locking engagement. If the existing lock is sound but the key is missing, 94152 is the separate CH751 key set.
391-key hatch cam and key
B&B's 391-code family is distinct from 751. The company describes the 391-style lock as key-alike ready, but that does not establish that every cylinder is already keyed to your other compartments. Compare the existing cam and key code before ordering a replacement.
Plastic thumb-turn hatch locks
For hatches without a key cylinder, B&B offers a polar-white thumb lock (94156) and a black version (94157). These UV-stable plastic components are not the same as complete replacement doors or keyed cam cylinders. The lock must still match the old hatch's retaining arrangement.
What to check before ordering
Record the original part number where present, the key code, the nominal cam size, the hatch's thickness, the direction of engagement and the condition of the surrounding door. A broken hinge or misaligned door can prevent an otherwise correct latch from closing. A new key cannot repair a worn or broken cam cylinder.
For a different exterior access-door shape, first identify the complete hatch manufacturer. B&B lock parts should not be assumed to fit a Valterra, RV Designer or another brand's door based on appearance alone.
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