Size is the only difference stated between them. The 61-509 is the standard-size emergency release key and the 61-510 is the large size, and both are for the B571 occupancy indicator deadbolt, both supplied with a key, ring, and instruction tag. The large version is the one to order where the key needs to be easier to find and grip, for example a housekeeping or nursing cart where a small key gets lost.

Only the B571 occupancy indicator deadbolt. The 61-509 and 61-510 are release keys made specifically for that deadbolt, and they are not a general privacy or bed and bath tool. If you are trying to release a standard privacy latch on an interior door, the tool for that is a privacy latch disengage tool such as the Cal-Royal PDL-200.

The Schlage 61-509 emergency release key is the standard size key for the B571 occupancy indicator deadbolt, and the 61-510 is the large size version of the same key; each ships with one key, a ring, and an instruction tag. The key is cut to the B571 release mechanism, so the choice is between standard and large size rather than between brands. Other release and disengage tools in the same general family are made for different mechanisms: the Cal-Royal PDL-200 is a privacy door latch disengage tool in steel construction, made to release a privacy bore latch, not an occupancy indicator deadbolt.

One key per order. Each 61-509 or 61-510 comes with a single key plus a ring and an instruction tag. You do not need one per opening, since the key releases the B571 occupancy indicator deadbolt itself, so most buildings buy a few for the staff who need access (front desk, housekeeping, maintenance) rather than one for every door. Order the quantity to match your staffing, not your door count.

Order the Schlage 61-509 if your original was the standard size or the 61-510 if it was the large one. Both are release keys for the B571 occupancy indicator deadbolt and both arrive with a ring and instruction tag, so a replacement drops straight back into the same use with nothing to modify on the deadbolt. If you are not sure which size you had, the large key is the easier one to standardize on across a property.

No. The Schlage 61-509 emergency release key operates the release on the B571 occupancy indicator deadbolt and is supplied as a key with a ring and instruction tag. The GMS IC6-26D is a 6-pin small format IC core only, un-combinated, with keys, pins, springs and caps not included, and the GMS IC7-26D is the 7-pin version of the same core; both are cylinders that go into a lock body prepped for an SFIC, not release tools. The GMS ICM7-ST is a Best SFIC straight mortise housing, 7-pin, with a Yale cam - a housing for a core, again a different part from a release key.

No. The Schlage 61-509 and 61-510 emergency release keys are supplied complete for their purpose - one key, one ring, and an instruction tag - and they operate the release on an existing B571 occupancy indicator deadbolt without any door or frame prep. Strike and latch hardware such as the Cal-Royal ASA478 template ASA strike, the ABH 1890 series roller latch with full lip cast strike and 5/16 inch adjustable projection, or the ABH 1895 series roller latch with T strike and 1/2 inch adjustable projection are frame-mounted parts for entirely different door functions.

No. The Schlage 61-509 emergency release key is a mechanical key for the B571 occupancy indicator deadbolt, supplied with a ring and instruction tag. Electronic openings are managed with their own tools: the Alarm Lock DTMIII is a data transfer module for Trilogy electronic access control systems with a 200-lock capacity, the Alarm Lock PCI2-U is a USB computer interface cable with DL-Windows software for programming, and the Alarm Lock PRE2 is a proximity card enroller for HID and iClass running on a 9V battery. The ACSI 8500 Gemini is an operator only in classroom function for a Corbin Russwin 2000 series mortise lever lock body. None of these operate an occupancy indicator deadbolt.

The Schlage 61-509 emergency release key works with the B571 occupancy indicator deadbolt, which is a mechanical deadbolt in a door. Glass door and magnetic lock openings take different hardware: the Codelocks CL4000-RSB is a glass door strike box for use with CL4000 or CL4500 glass door locks, the Securitron AOS is an armature offset strike, and the ABH 20020 is a standard door armature head assembly with 1-5/8 inch projection. Those are mounting and strike components for their own lock types rather than release keys.

The 61-509 is the standard size emergency release key for the B571 occupancy indicator deadbolt and the 61-510 is the large size key for the same deadbolt; both include one key, one ring, and an instruction tag. The difference is the physical size of the key body, which matters where staff handle it with gloves or where it hangs on a station board. A facility standardizing on B571 deadbolts across many rooms commonly stocks the size that suits how the keys are carried, and the other size only where handling calls for it.