TownSteel CRX-K-81 Entry/Office Function - Heavy Duty Ligature Resistant Knob Cylindrical Lockset

Yes. The CRX-K-81 ligature-resistant knob lockset covers a door thickness range of 1-3/4 inches to 2 inches, so it handles standard 1-3/4 inch commercial doors and the thicker 2 inch leaves you often see in behavioral health construction. It will not work on a 1-3/8 inch door, which is the common older residential interior thickness. If your openings are 1-3/8 inch, look at something like the Corbin Russwin CK4851 Entrance/Office cylindrical knob lock, which covers 1-3/8 to 2 inches.

Two backsets are offered on the CRX-K-81: 2-3/4 inch, which is the standard commercial backset and the one you want for typical hollow metal and wood door prep, and a 5 inch backset for openings where the bore sits farther off the door edge, such as wide stile doors. Pick the one that matches the existing cross bore; a 2-3/4 inch lock will not reach a 5 inch prep.

The CRX-K-81 ships with a 1-1/4 inch by 4-7/8 inch ASA strike, which is the standard commercial frame cutout on hollow metal frames. If your frames are already prepped for an ASA strike, this drops straight in. The latch face plate is 1-1/8 inch by 2-1/4 inch with square corners, so a door edge routed for a square corner face of that size takes it without rework. Round corner preps will need the edge dressed.

The CRX-K is built around a ligature-resistant stainless steel knob with a sloped profile that will not hold a cord or strap, and it uses tamper-resistant mounting screws so a patient cannot back the lock off the door. TownSteel positions it for behavioral, mental, and psychiatric healthcare facilities housing patients at risk. A standard commercial knob lock, even a Grade 1 one, does not give you that, so for anti-ligature suicide-resistant openings this is the type of lock to specify rather than a conventional knobset.

The CRX-K-81 is a Grade 1 single cylinder cylindrical knob lock in Entry/Office function, and its ligature-resistant stainless steel knob and tamper-resistant mounting screws are what set it apart for behavioral health openings. On a standard corridor or office door where ligature resistance is not a requirement, the BEST 8K Series 8K-AB is a Grade 1 heavy duty single cylinder knob lock in Entrance function, and the Corbin Russwin CK4851 is a Grade 1 Entrance/Office cylindrical lock with the Global knob and a conventional cylinder. Both carry the same grade and a comparable keyed function, with a conventional knob profile rather than the ligature-resistant one.

The CRX-K-81 is built as an Entry/Office function lock, so the outside knob can be left unlocked by the inside button. If the door needs to stay locked at all times with the key always retracting the latch, the Sargent 8XG04 is a Grade 1 heavy duty single cylinder storeroom/closet knob lock with a 2-3/4 inch backset, and the Sargent 6G04 is the Grade 2 standard duty storeroom equivalent. Neither carries the ligature-resistant knob that the CRX-K-81 uses, so for a patient-accessible door the function change would need to come from the ligature-resistant series instead.

No. The CRX-K-81 is a Grade 1 heavy duty cylindrical lock with a ligature-resistant stainless steel knob intended for behavioral, mental and psychiatric healthcare facilities housing patients at risk. Entry and entrance knobs such as the Dexter C2000 Entry/Office ball knob and the Corbin Russwin CK4851 are Grade 2 and Grade 1 respectively but use conventional knob shapes, and lighter options such as the Cal-Royal BER00 and the Pamex FTF Baron are Grade 3 Entrance/Office locks. They serve standard openings; none of them are built with the ligature-resistant knob geometry the CRX-K-81 provides.

The CRX-K-81 covers a 1-3/4 inch to 2 inch door thickness range, so a 1-3/8 inch door falls below it. For a thinner door at Grade 1, the Corbin Russwin CK4851 Entrance/Office lock covers 1-3/8 inch to 2 inch, the Falcon X101 Grade 1 heavy duty passage knobset covers 1-3/8 inch to 2-1/4 inch, and the Corbin Russwin CK4310 passage lock covers 1-3/8 inch to 2 inch. Match the function to the opening: only the CK4851 among those is keyed.

Entry/Office on the CRX-K-81 means the outside knob can be locked or unlocked by key from the outside, and the inside knob always retracts the latch for free egress. It uses a single cylinder, so there is one keyed side. This is the function you want on patient room doors, staff offices, and any room a nurse or clinician needs to secure but occupants must always be able to leave.

Both. The CRX-K mounts on wood doors and on metal doors, so a facility running hollow metal patient room doors and wood office doors can standardize on one lock across the building. Door thickness is the real limit: 1-3/4 inches to 2 inches regardless of material.

Keying is a required selection when ordering. Keyed different (KD) is standard and gives each lock its own key. Keyed alike (KA) puts multiple locks on one key, which is what most facilities want for a run of like doors. If you are matching an existing system, choose the Key Code option and supply your code in the key code field. Non-keyed functions take the N/A option.

The CRX-K-81 is ANSI Grade 1, heavy duty, cylindrical. Grade 1 is the highest commercial rating and the one written into most institutional specs. Among other Grade 1 heavy duty knob locks, the BEST 8K Series entrance function and the Sargent 8XG04 storeroom lock are conventional commercial knobsets; the Falcon X101 is a Grade 1 heavy duty passage knobset with an interchangeable core. None of those are ligature-resistant, so they are alternatives for general commercial openings, not for behavioral health rooms.

The CRX-K-81 is a single cylinder keyed Entry/Office lock. For an opening that only needs the latch held, the Corbin Russwin CK4310 is a Grade 1 non-keyed passage/closet cylindrical lock and the Falcon X101 is a Grade 1 heavy duty non-keyed passage knobset that is fire rated. At Grade 2 the Falcon W101 is a medium duty fire rated passage knob lock with a 2-3/4 inch backset, which matches the standard backset the CRX-K-81 is offered in.

Those are residential and decorative trim lines, not a like-for-like swap. The CRX-K-81 is a commercial Grade 1 heavy duty cylindrical lockset with a ligature-resistant stainless steel knob and tamper-resistant mounting screws. The Baldwin Estate 5000 Baltimore knob comes preconfigured as a passage or privacy lock with a 2-3/8 inch backset, and the Emtek Arts and Crafts Hammered Egg and Classic Crystal Georgetown knobsets are dummy sets with no latching mechanism at all. None of them offer the keyed Entry/Office function or the ligature-resistant knob form.

The CRX-K-81 is offered in Entry/Office function only. For a classroom lock, the Dexter C2000 Series classroom cylindrical ball knob is a Grade 2 keyed lock for 1-3/8 inch to 1-3/4 inch doors, and the Sargent 28C-KNOB is an exit device trim with knob and rose in classroom function for 1-3/4 inch doors. The Dexter is a complete bored lock; the Sargent 28C is trim that mounts to a 28 Series exit device, not a standalone cylindrical lockset.

One finish: 630, satin stainless steel. That matches the stainless knob and is the standard institutional finish, so it ties in with the stainless push plates, hinges and exit hardware typically already on behavioral health openings. If you need to match a bronze or brass building standard, this lock will not do it.

The CRX-K-81 specifically is the Entry/Office keyed version, single cylinder. TownSteel builds the ligature-resistant CRX-K around a family of functions, so for a closet, corridor or bathroom door in the same facility you would order the corresponding non-keyed CRX-K function and select N/A for keying rather than adapting this one. Keeping them all in the CRX-K line keeps the same knob profile and 630 stainless finish across the openings.

The CRX-K-81 is a keyed Entry/Office cylindrical lock and is not made as a dummy trim. For an inactive leaf, the Schlage A170 is a Grade 2 heavy duty single dummy trim covering 1-3/8 inch to 1-7/8 inch doors, and the BEST 6K-1DT is a Grade 2 medium duty single dummy trim in the 6K Series. Both are non-keyed and non-latching, so they are for the inactive leaf only, and neither uses a ligature-resistant knob.

The CRX-K-81 uses a single cylinder and is ordered keyed different, keyed alike, or to a specific key code. If the requirement is code entry rather than a key, the Lockey 3830 is a mechanical keyless combination knob lock with an auto-locking passage function that fits doors from 1 3/16 inch to 2 inch. It is a different security approach and does not carry the Grade 1 rating or the ligature-resistant knob of the CRX-K-81, so it is not suited to a patient-accessible opening.