TownSteel CRX-K-81 ANSI Grade ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$762.00
$612.66
TownSteel CRX-K-81 ANSI Grade 1 Ligature-Resistant Knob Cylindrical Lockset for Entry/Office Function

TownSteel CRX-K-81 ANSI Grade 1 Ligature-Resistant Knob Cylindrical Lockset for Entry/Office Function

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Model: CRX-K-81-630
$762.00
$612.66
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$762.00
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TownSteel CRX-K-81 ANSI Grade 1 Ligature-Resistant Knob Cylindrical Lockset for Entry/Office Function

The TownSteel CRX-K-81 is an ANSI Grade 1 cylindrical lockset featuring a ligature-resistant stainless steel knob designed for behavioral, mental, and psychiatric healthcare facilities housing at-risk patients. This Entry/Office function lockset uses a Single Cylinder keyed configuration and is equipped with tamper-resistant mounting screws to deter unauthorized disassembly. Built for door thicknesses of 1-3/4" to 2", the CRX-K-81 mounts securely onto both wood and metal doors, delivering heavy-duty commercial performance where patient and staff safety are paramount.

Key Features

  • Door Thickness Compatibility: Engineered for doors ranging from 1-3/4" to 2" thick, covering standard commercial door constructions.
  • Face Plate Dimensions: 1-1/8" x 2-1/4" square corner face plate for clean, precise installation.
  • Door Strike Specification: 1-1/4" x 4-7/8" ASA strike ensures reliable latch engagement.
  • Heavy-Duty ANSI Grade 1 Construction: Commercial-grade durability rated for demanding, high-traffic institutional environments.
  • Ligature-Resistant Knob: Stainless steel knob design minimizes ligature points, supporting patient safety in behavioral and psychiatric care settings.
  • Tamper-Resistant Mounting Screws: Specialized fasteners deter unauthorized removal or tampering, reinforcing facility security.
  • Versatile Door Mounting: Compatible with both wood and metal door installations for flexible application across facility types.
  • Single Cylinder Entry/Office Function: Keyed single-cylinder operation supports controlled access for entry and office applications.

Certifications & Compliance

  • ANSI/BHMA Grade 1

Technical Specifications

  • Series: CRX-K Series
  • Product Group: Mechanical Locks
  • Product Subgroup: Bored Locksets
  • Product Type: Knobsets
  • Subcategory: Cylindrical Locks
  • Commercial/Residential: Commercial
  • Keyed Function: Single Cylinder
  • Duty Level: Heavy Duty
  • Product Function: Entry/Office
  • Door Thickness Range: 1-3/4" to 2"
  • Face Plate: 1-1/8" x 2-1/4", square corner
  • Door Strike: 1-1/4" x 4-7/8", ASA Strike
  • Product Category: Mechanical Locks
  • Department: Door Hardware

Typical Applications

  • Behavioral and Psychiatric Healthcare Facilities
  • Mental Health Treatment Centers
  • Hospitals and Medical Institutions
  • Correctional and Detention Facilities
  • Assisted Living and Senior Care Facilities
  • Commercial Office Buildings
  • Educational Facilities

Why TownSteel CRX-K?

TownSteel CRX-K Series locksets deliver ANSI Grade 1 commercial-grade reliability engineered specifically for at-risk patient environments. The ligature-resistant stainless steel knob combined with tamper-resistant mounting hardware provides facility managers with dependable, safety-focused hardware for the most demanding behavioral and psychiatric healthcare applications.

Product Specs

Series:
CRX-K Series
Product Group:
Mechanical Locks
Product Subgroup:
Bored Locksets
Product Type:
Knobsets
Subcategory:
Cylindrical Locks
Commercial/Residential:
Commercial
Lock Type:
Cylindrical
Handle Type:
Knob
Keyed Function:
Single Cylinder
Duty Level:
Heavy Duty
Grade:
Grade 1
Product Function:
Entry/Office
Door Thickness Range:
1-3/4" to 2"
Face Plate:
1-1/8" x 2-1/4", square corner
Door Strike:
1-1/4" x 4-7/8", ASA Strike
Product Category:
Mechanical Locks
Department:
Door Hardware

TownSteel CRX-K-81-630 – Frequently Asked Questions

1) Will the TownSteel CRX-K-81 fit a 2 inch thick door?
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.
2) What backset do I order for the CRX-K-81, and does it work on a wide stile aluminum-style door?
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.
3) Will the CRX-K-81 latch into the strike prep already in my frame?
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.
4) Is the TownSteel CRX-K really ligature resistant, and where is it used?
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.
5) What is the closest Grade 1 keyed knob lock to the TownSteel CRX-K-81 if the opening does not need ligature resistance?
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.
6) I need the same heavy duty knob lock but in a storeroom function instead of entry/office - what should I order?
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.
7) Is a Grade 2 or Grade 3 entry knob an acceptable substitute for the CRX-K-81 on a behavioral health door?
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.
8) My doors are 1-3/8 inch thick - the CRX-K-81 will not fit, so what Grade 1 knob lock will?
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.
9) What does Entry/Office function mean on a ligature resistant knob lock?
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.
10) Can the CRX-K-81 be installed on a wood door, or is it metal doors only?
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.
11) How do I key the CRX-K-81 for a whole floor of patient rooms?
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.
12) Is this a Grade 1 lock, and how does it compare to other heavy duty knob locks?
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.
13) If the door needs latching only and no key, what replaces the CRX-K-81?
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.
14) Can I use a Baldwin or Emtek knobset in place of the CRX-K-81 in a healthcare facility?
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.
15) I need a classroom function knob instead of entry/office - what are my options?
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.
16) What finish does the TownSteel CRX-K-81 come in?
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.
17) I need the same ligature resistant look on a door that does not need a key. What do I do?
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.
18) What should I use for the dummy side of a pair when the active leaf has a CRX-K-81?
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.
19) Does any comparable knob lock offer keyless combination entry like the CRX-K-81 does with a key?
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.
How fast can I get the TownSteel CRX-K-81-630 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the TownSteel CRX-K-81-630 come with a warranty?
Absolutely. The TownSteel CRX-K-81-630 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the TownSteel CRX-K-81-630?
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