HES 660-KO Key Override for 660 Series Cabinet Lock

The 660-KO is the key override accessory for the HES 660 Series cabinet lock. It gives you a mechanical way into the cabinet when you don't want to rely on the electronic side alone, which is what a facility crew wants on drug cabinets, tool cribs, and records storage. It's an add-on part for the 660 lock, not a standalone lock, so you need a 660 Series cabinet lock already in place or on the same order.

Only the HES 660 Series cabinet lock. The 660-KO is built as the key override for that specific lock family, so it won't adapt to another manufacturer's cabinet lock or to a different HES product. If the cabinet hardware you're retrofitting isn't a 660, this isn't the part.

Different jobs entirely, even though both are field-added parts on electrified openings. The 660-KO is a key override for the HES 660 series cabinet lock, so it is the mechanical means of getting into the cabinet when the electronics are not driving the lock. The Command Access REX-KIT-ML is a request to exit kit for ML1-series mortise locks, and the SCHLBMKIT-ML is a latchbolt monitor switch kit for Schlage L9000 mortise locks with an SPDT configuration; both add signaling contacts to a door lock so the access control system knows what the lock is doing. A switch kit reports a condition, the 660-KO gives you a way in. If the cabinet needs manual access, a REX or monitor kit will not substitute for it.

Grade 1 and specified as commercial, so it's the tier institutional and MRO buyers standardize on for high-traffic facilities. Grade 1 is the heaviest of the three ANSI/BHMA duty tiers, which is why it turns up on healthcare, education, and government cabinet specs rather than light-duty office furniture.

Yes, it's ordered as its own line item. The 660-KO ships as a single model with no finish or size options to pick, so the only thing to confirm on the order form is that the lock it's going onto is a 660 Series. One part number, one configuration.

The 660-KO belongs to an electronic access control product family, but it's the mechanical override path into a 660 cabinet lock, so it isn't a device you run conductors to on its own. Plan the low-voltage work around the 660 lock itself; the override is installation hardware that goes on with the lock.

No. The 660-KO is scoped to HES 660 Series cabinet locks. For door-side access control accessories, ZenSupply carries different parts entirely, like the Command Access REX-KIT-ML request-to-exit kit for ML1-Series mortise locks or the RCI 9500/9501 Series mortise pin transfer. Those solve door hardware problems; the 660-KO solves a cabinet one.

They solve opposite problems. The 660-KO is an installation accessory that adds key override to the HES 660 series cabinet lock, which is about access and control of the opening. Mounting and cover accessories are about how the device sits on the surface and how it is protected: the Cal-Royal 8641-SM is a single gang surface mount box in the 8600 series, the Securitron SAM Surface Mount Kit Accessories and the Securitron SWB SAM wood bracket support surface mounting of SAM hardware, and the Dortronics 6510/COV is an anti-tamper alarm cover for 6500 series pull stations and 5000 series push buttons. If the requirement on the drawing is manual key access to a locked cabinet, none of those enclosure or bracket parts address it, and if the requirement is mounting a device to a wall or wood frame, the 660-KO does not address that.

The HES 660-KO carries a Grade 1 designation and is a commercial electronic access accessory, so it lines up with facility standards written around Grade 1 hardware. The Securitron Glass Door Accessories in the Glass Door series carry a Grade 2 designation and, as the name says, address glass door applications rather than cabinet locking. For an institutional buyer standardizing on one grade across a facility, that is the deciding difference: the 660-KO matches a Grade 1 specification and the glass door accessories are a Grade 2 part for a different opening type. Confirm which grade the facility standard calls for before choosing.

Different jobs. The 660-KO gives a 660 cabinet lock a key override, a way in by hand. The Command Access SCHLBMKIT-ML is a field installable latchbolt monitor switch kit with an SPDT configuration for Schlage L9000 mortise locks, so it reports lock status back to a panel rather than letting anyone in. If you're after monitoring or REX signalling, the Command Access kits are the family to look at, including the CRSREXKIT-ED for Cal Royal 22/98 and Sargent 80 Series devices.

No, those are power and control components rather than a means of access. The Adams Rite 4605 is a regular transformer taking 115 VAC to 12/24 VAC with a 40 volt-amp output, and the Locknetics RDB4 is a four output relay distribution board. Both belong on the supply and switching side of an electrified opening, feeding or sequencing the devices. The 660-KO is the key override for the HES 660 series cabinet lock and is what lets someone open the cabinet by key. If the problem is powering or relay-controlling the lock, the transformer or relay board is the right family of part; if the problem is manual access to the cabinet, it is the 660-KO.