Cal-Royal NM8473 Heavy Duty Gr...
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$326.16
Cal-Royal Cal-Royal NM8473 Heavy Duty Grade 1, Dormitory / Bedroom Mortise Lockset NM Series NM8473

Cal-Royal NM8473 Heavy Duty Grade 1 Dormitory/Bedroom Mortise Lockset with Deadbolt

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Model: NM8473-SS-RH-US26D
$326.16
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Cal-Royal NM8473 Heavy Duty Grade 1 Dormitory/Bedroom Mortise Lockset with Deadbolt

The Cal-Royal NM8473 is a Heavy Duty Grade 1 dormitory/bedroom mortise lockset (F21 function) designed for 1-3/4" thick doors with a 2-3/4" backset. The latch bolt is retracted by knob or lever from either side, while the 1" throw deadbolt is extended or retracted by key outside or thumb turn inside, operating independently of the latch bolt. Built with a heavy gauge zinc chromate steel lockcase and an 8" x 1-1/4" x 3/32" heavy gauge steel front, this lockset meets ANSI/BHMA A156.13, Series 1000, Operational & Security Grade 1 Standards and exceeds 1,000,000 cycles, making it a dependable choice for high-traffic dormitory and apartment applications.

Key Features

  • Door & Backset Specifications: Designed for 1-3/4" thick doors with a 2-3/4" backset for standard commercial door preparations.
  • Heavy-Duty Durability: Exceeds 1,000,000 cycles, conforming to Federal Specification Type 86 and ANSI/BHMA A156.13 Series 1000 standards.
  • Heavy-Duty Construction: Heavy gauge zinc chromate steel lockcase with an 8" x 1-1/4" x 3/32" steel front, accommodating flat doors and doors beveled 1/8" in 2".
  • Armored Front: Wrought brass, attached by machine screws to the lockcase front, concealing lock mounting screws.
  • Deadbolt & Latchbolt: 1" throw brass, chrome-plated deadbolt with hardened steel rollers and anti-saw hardened pins; brass, chrome-plated heavy-duty latchbolt with anti-friction latch.
  • Guardbolt & Stopworks: Extruded brass, chrome-plated guardbolt and rocker-type brass, chrome-plated stopworks for reliable operation.
  • Strike Plate: Brass, non-handed curved strike measuring 4-7/8" x 1-1/4"; curved-up strike available upon request.
  • Field-Reversible Handing: Handed but easily field-reversible with individual springs to prevent lever sag.
  • Escutcheon Dimensions: 2 ½" W x 8 ¼" H x ½" T for standard trim compatibility.
  • Forged Brass Levers: Forged brass lever handles exceed ADA requirements for ease of use.
  • Optional Interchangeable Core: Available for facilities requiring rekeying flexibility.

Certifications & Compliance

  • UL Listed "A" Label (3 hours) for use on fire doors, single or pair of doors, with "F" mark stamped on strike
  • Conforms to UL10C and UBC 7-2-1997 standards
  • Meets ANSI/BHMA A156.13, Series 1000, Operational & Security Grade 1 Standards; exceeds 1,000,000 cycles
  • Conforms to Federal Specification Type 86
  • Meets ADA (American Disability Act) Regulations
  • BHMA Certified Lifetime Warranty, Grade 1

Technical Specifications

  • Product Group: Mechanical Locks
  • ANSI/BHMA: Meets ANSI/BHMA A156.13, Series 1000, Operational & Security Grade 1 Standards Lock body conforms to Federal Specification Type 86, and all dimensional and operational performances, Exceeds 1,000,000 cycles
  • Product Subgroup: Mortise Locks and Trim
  • Product Type: Mortise Locks
  • Subcategory: Mortise Lockset
  • Latch Throw: 1" (deadbolt)
  • Commercial/Residential: Commercial
  • Cylinder and Keyways: 6-Pin solid brass "C" Keyway Standard
  • Lock Type: Mortise
  • Keyed: Yes
  • Product Attribute: Mortise Locks
  • Electronic: No
  • Product Function: Apartment/Dormitory
  • Door Hand Direction: Field Reversible
  • Product Category: Mechanical Locks
  • Department: Door Hardware

Typical Applications

  • Educational Facilities
  • Dormitory and Apartment Buildings
  • Multi-Tenant Residential Properties
  • Healthcare Institutions
  • Commercial Office Buildings
  • Government and Municipal Buildings

Why Cal-Royal NM8473?

Cal-Royal NM8473 mortise locksets deliver professional-grade reliability with heavy gauge zinc chromate steel construction and forged brass hardware, tested to exceed 1,000,000 cycles under ANSI/BHMA A156.13 Series 1000 standards. Engineered for demanding dormitory, apartment, and commercial applications where dependable, field-reversible performance and fire-rated compliance are essential.

Product Specs

Product Group:
Mechanical Locks
ANSI/BHMA:
Meets ANSI/BHMA A156.13, Series 1000, Operational & Security Grade 1 Standards Lock body conforms to Federal Specification Type 86, and all dimensional and operational performances, Exceeds 1,000,000 cycles
UL Listing Type:
UL Listed "A" Label (3 hours), for use on fire doors, single or pair of doors. "F" mark stamped on strike
Grade:
Grade 1
Product Subgroup:
Mortise Locks and Trim
Product Type:
Mortise Locks
Subcategory:
Mortise Lockset
Latch Throw:
1" (deadbolt)
Commercial/Residential:
Commercial
Cylinder and Keyways:
6-Pin solid brass "C" Keyway Standard
Lock Type:
Mortise
Lock Function:
Dormitory
Keyed:
Yes
Product Attribute:
Mortise Locks
Electronic:
No
Product Model:
NM8473
Product Function:
Apartment/Dormitory
Door Hand Direction:
Field Reversible
Door Thickness Range:
1-3/4"
Door Strike:
Brass, non-handed curved Strike 4-7/8" x 1 1/4". Curved-up Strike available upon request
Product Category:
Mechanical Locks
Product Substrate:
Steel
Backset (Distance):
2-3/4"
Department:
Door Hardware

Cal-Royal NM8473-SS-RH-US26D – Frequently Asked Questions

1) Will the Cal-Royal NM8473 mortise lockset fit a 1-3/4 inch door with a 2-3/4 inch backset prep?
That is exactly the prep it is built for. The NM8473 is a single-thickness lock: 1-3/4 inch doors only, with a 2-3/4 inch backset. If your openings are thicker than 1-3/4 inches, this is the wrong body for them. The lock front measures 8 x 1-1/4 x 3/32 inches and works on flat doors as well as doors beveled 1/8 inch in 2 inches, so a standard commercial mortise pocket takes it without rework.
2) What does the dormitory F21 function on the NM8473 actually do at the door?
Latchbolt retracts by knob or lever from either side at all times, so nobody gets locked in. Security comes from the separate 1 inch throw deadbolt, thrown or withdrawn by key from outside or by thumbturn from inside. The two bolts work independently, so a resident can leave the deadbolt out for privacy without affecting normal passage on the latch. That is the behavior apartment and dorm rooms are usually specified for: free egress, resident-controlled deadbolt, key entry for management.
3) Do I have to order the NM8473 mortise lock handed, or can it be reversed in the field?
Order it left hand or right hand, but handing is not a trap here: the NM8473 is handed and field reversible, with individual springs on each side to keep the lever from sagging. If a door swing turns out opposite to the takeoff, the lock can be turned on site rather than returned. The curved strike is non-handed, so it goes on either way.
4) Will the NM8473 latch into the strike prep already in my frame?
The lock ships with a brass non-handed curved strike measuring 4-7/8 x 1-1/4 inches, which is the common ANSI mortise strike footprint, so an existing mortise frame prep of that size usually takes it directly. A curved-up strike is available on request if your frame needs the lip turned. Remember the deadbolt throws a full 1 inch, so the frame pocket has to be deep enough behind the strike to accept it.
5) What is a comparable Grade 1 dormitory mortise lock with a deadbolt if the Cal-Royal NM8473 does not suit?
The Sargent 7925 from the 7900 Series is the closest equivalent, a heavy duty Grade 1 corridor/dormitory function mortise lock with rose trim and a single cylinder deadbolt. For a keyed classroom function instead of dormitory, the Corbin Russwin ML2003 is Grade 1 for 1-3/4 inch doors. If all you need is the deadbolt and not a lockset, the Sargent 4874 is a double cylinder mortise deadbolt on a 2-3/4 inch backset, matching the NM8473 backset.
6) My doors are thicker than 1-3/4 inches. What mortise lock should I use instead of the Cal-Royal NM8473?
The NM8473 is a 1-3/4 inch door lock only, so a thicker leaf needs a different body. Hager's 3800 Series covers 1-3/4 to 2-1/2 inches on a 2-3/4 inch backset (the 3810E passage with escutcheon and the 3850E office lever are in that range), and Baldwin's 6301 apartment mortise lock body is listed for 1-3/4 inches and over, though on a 2-1/2 inch backset rather than 2-3/4. Match the backset to your existing prep before you pick.
7) What is the closest equivalent to a Cal-Royal NM8473 dormitory mortise lock from another manufacturer?
The Sargent 7925 is the nearest match in function. It is a Grade 1 heavy duty mortise lock with a corridor/dormitory function and a single cylinder deadbolt, the same combination the NM8473 provides with its 1 inch throw deadbolt and dormitory function. The main difference in how they present on the door is trim: the Sargent 7925 uses rose trim, while the NM8473 is ordered with either SE escutcheon trim or SS sectional trim.
8) If the opening only needs a deadbolt and no latch, what mortise lock should be used instead of the NM8473?
Use a dedicated mortise deadbolt. The Sargent 4874 is a double cylinder mortise deadbolt with a 2-3/4 inch backset, matching the NM8473's 2-3/4 inch backset so the door prep lines up on that dimension. The Kaba Ilco 185 Series is also a deadbolt function mortise lock and is supplied with no handing. The NM8473 combines a knob or lever operated latch bolt with the deadbolt, so it is the choice only when the opening needs both.
9) What is the difference between the Cal-Royal NM8473 and a storeroom mortise lock like the Accentra 8805FL?
Function. The Accentra 8805FL is a Grade 1 storeroom mortise lock from the 8800 Series, where the outside lever stays locked and a key retracts the latch. The NM8473 is a dormitory function lock: the latch bolt retracts by knob or lever from either side, and the separate 1 inch throw deadbolt is thrown by key outside or thumb turn inside. Choose the 8805FL for a stockroom or utility door that must stay secured, and the NM8473 for a dorm or apartment entry where the occupant sets the deadbolt from inside.
10) Can a Baldwin 6301 apartment mortise lock be used in place of a Cal-Royal NM8473?
Not as a drop-in. The Baldwin 6301 is an entrance/apartment mortise lock body with a 2-1/2 inch backset, while the NM8473 is built to a 2-3/4 inch backset, so the cylinder and spindle centerlines fall in different places and the existing door prep will not accept both. Baldwin lists the 6301 for doors 1-3/4 inch and over; the NM8473 is for 1-3/4 inch doors. The 6301 comes as knob by knob and the 6301LS as lever by lever.
11) What should be used instead of a mechanical dormitory mortise lock when the building wants credentials rather than keys?
Several electronic mortise locks cover the same openings. The TownSteel FME-2000 Series is a Grade 1 heavy duty mortise lockset with RFID technology for 1-3/4 inch doors, the same door thickness the NM8473 is built for. The Alarm Lock DL4500 Series is a Grade 1 electronic mortise deadbolt with 2,000 user codes and a privacy keypad for doors 1-5/8 inch to 1-7/8 inch. The Dormakaba E-Plex E5086 is a Grade 1 entry/egress electronic pushbutton and card mortise lock. The NM8473 is a mechanical lockset with no electronic components, so it needs no power, wiring, or credential management.
12) Which mortise lockset suits a behavioral health or patient room where a dormitory lock will not do?
Anti-ligature trim is the deciding factor there. The TownSteel MRX-L-01 is a Grade 1 heavy duty stainless steel anti-ligature lever mortise lockset with passage function for 1-3/4 inch doors, and the MRX-A-01 is the same passage function in satin stainless steel with ligature resistant arch trim. The Marks USA 5PDN is a Grade 1 hospital passage mortise push/pull paddleset, ligature resistant and ADA compliant in satin stainless steel. The NM8473 uses forged brass lever handles on escutcheon or sectional trim and is built for dormitory and apartment entries.
13) Is a Schlage PC10 an alternative to the Cal-Royal NM8473?
They are different lock types. The Schlage PC10 is a Grade 1 passage cylindrical lock, non-keyed with a rose, for 1-3/4 inch doors, and it fits a bored door prep. The NM8473 is a mortise lock, which requires a rectangular pocket machined into the door edge. The two preps are not interchangeable, so the door has to be checked before either is ordered.
14) Which mortise lock should be chosen when the opening has to release on an access control signal?
An electrified body is required for that. The Command Access ML190 Series is a heavy duty motorized mortise lock with storeroom function and field selectable EL or EU operation at 24VDC. The BEST 45HW Series is a heavy duty wired electromechanical mortise lock with 12V or 24V operation. The Schlage L9092EU with 03A trim is a heavy duty electric lock/unlock outside lever mortise lock, keyed outside, with request to exit, at 12/24VDC for 1-3/4 inch doors. The NM8473 is a mechanical lockset with no electronic function, so it cannot be tied to an access control system.
15) What keyway does the Cal-Royal NM8473 use, and can it take an interchangeable core for a master key system?
Standard is a 6-pin solid brass "C" keyway cylinder. An optional interchangeable core version is available where a facility wants to rekey without pulling the lock apart, which is the usual choice for dorms and apartment buildings with tenant turnover.
16) Is a Grade 1 mortise lock like the NM8473 worth it over a cylindrical lock for apartment corridors?
For high-traffic residential entries, yes. The NM8473 carries ANSI/BHMA A156.13 Series 1000 Grade 1 and is tested past 1,000,000 cycles, with a heavy gauge zinc chromate steel lockcase and a wrought brass armored front that hides the lock mounting screws. It also puts a 1 inch deadbolt in the same case, so you get latch and deadbolt in one mortise pocket instead of a cylindrical lock plus a separate deadbolt with two preps and two keys.
17) Is the NM8473 lever ADA compliant for a dormitory corridor?
The forged brass lever handles meet ADA requirements for operation without tight grasping or twisting. Note that a lever trim is what gets you there; the knob version does not. If the opening is on an accessible route, order the lever.
18) Is the Cal-Royal NM8473 an electronic or keypad lock, and what should I look at if I want credential access on dorm rooms?
The NM8473 is purely mechanical, keyed, with no electronics in the case. For credentialed dorm access on Grade 1 mortise bodies, the TownSteel FME-2000 Series adds RFID on 1-3/4 inch doors, and the Schlage Electronics LEMD-GRW is a Grade 1 wireless ENGAGE mortise lock with a 125kHz proximity reader and a 3 hour fire rating. Those swap the key for a card; you give up the resident thumbturn deadbolt arrangement the NM8473 provides.
19) How well does the NM8473 deadbolt resist attack on a ground floor apartment door?
The deadbolt is brass, chrome plated, with a full 1 inch throw, and it carries hardened steel rollers plus anti-saw hardened pins so a blade in the gap will not cut it. The latchbolt is brass chrome plated heavy duty with an anti-friction latch, and there is a separate extruded brass guardbolt that deadlocks the latch against carding. The lock is rated to ANSI/BHMA A156.13 Series 1000 for security as well as operational Grade 1.
20) Does the Cal-Royal NM8473 or a Schlage LE Series mortise lock carry the higher ANSI grade?
The NM8473 meets ANSI/BHMA A156.13 Series 1000 Operational and Security Grade 1 and exceeds 1,000,000 cycles. The Schlage Electronics LEBMB-ADD mobile-enabled mortise lock is Grade 2, rated for 1-3/4 inch doors with a 3 hour fire rating, and covers privacy, office, and apartment functions. The Schlage LEMD-GRW ENGAGE Series wireless mortise lock is Grade 1 with a 3 hour fire rating and a 125kHz proximity reader. The NM8473 is UL Listed A Label at 3 hours for fire doors, single or pair, with the F mark stamped on the strike.
21) Which mortise lock should be specified for a classroom door instead of a dormitory lock?
For a classroom opening, the Corbin Russwin ML2003 is a Grade 1 mortise classroom lockset from the ML2000 Series built for 1-3/4 inch doors, the same door thickness the NM8473 is built for. The Marks USA LA318GJ is a Grade 1 classroom security indicator mortise lockset for 1-3/4 inch doors, supplied with an ANSI strike and a steel escutcheon measuring 8-1/2 inch H x 2-3/4 inch W x 7/16 inch. The NM8473 is a dormitory function lock and does not provide classroom keying behavior.
22) Is there a simpler mortise lock for the doors in a building that do not need keying?
Yes. On corridor and closet doors that only need latching, the Hager 3810E is a Grade 1 passage mortise lock with escutcheon and a 2-3/4 inch backset for doors 1-3/4 inch to 2-1/2 inch, and the Hager 3810S is the same passage lock with rose trim. The Schlage PM010 is a Grade 1 non-keyed passage latch mortise lock for 1-3/4 inch doors. All share the 2-3/4 inch backset used by the NM8473 where stated, so the door prep is consistent across the building, but none of them are keyed or carry a deadbolt the way the NM8473 does.
23) What mortise lock replaces a dormitory lockset when the room needs privacy rather than keyed entry?
For a bed or bath opening, the Hager 3840S is a Grade 1 privacy mortise lock with a 2-3/4 inch backset for doors 1-3/4 inch to 2 inch. For an office door, the Hager 3850E is a Grade 1 office mortise lock with lever and escutcheon, non-keyed, with a 2-3/4 inch backset for 1-3/4 inch to 2-1/2 inch doors. Both carry the same 2-3/4 inch backset as the NM8473. The NM8473 differs in that it is keyed with a 6-pin solid brass C keyway and adds the 1 inch throw deadbolt.
24) Are Emtek 3102 Memphis and similar mortise entrance locksets a substitute for a Grade 1 dormitory lockset?
No. The Emtek 3102 Memphis, 3104 Hamilton, 3106 Manhattan, and 3019 Brisbane mortise entrance locksets are all dummy function, meaning they are non-operating trim with no latch or deadbolt behind them. They are used on the inactive leaf of a pair or on a door that does not latch. The NM8473 is a keyed dormitory lock with a working latch bolt and a 1 inch throw deadbolt.
25) What is the difference between ordering a complete mortise lockset and a mortise lock body like the BEST 45H?
The BEST 45H Series is a heavy duty mortise lock body with public entrance function and field reversible operation, and the 45HCA Series is a heavy duty mortise lock body with intruder function. A lock body is the case that goes in the door pocket, so trim and cylinder are specified separately. The NM8473 is supplied as a complete lockset, ordered with trim design chosen up front as SE escutcheon or SS sectional, and it is field reversible as well.
26) Can a Falcon MA101 be used on a dorm room entry door?
The Falcon MA101 is a Grade 1 heavy duty mortise passage lock with field reversible operation and a fire rating, in the MA Series. Passage function means the latch retracts from both sides at all times, with no key and no deadbolt, so it fits a corridor or closet door rather than a dorm room entry that has to lock. For the entry itself, the NM8473 gives the keyed dormitory function with the 1 inch throw deadbolt, and it is also field reversible.
27) What mortise lock works on a 1-5/8 inch to 1-7/8 inch door if the NM8473 does not fit?
The NM8473 is built for 1-3/4 inch doors. Where a wider thickness range is needed, the Alarm Lock DL2700CR Trilogy T2 electronic mortise lock is Grade 1 classroom function with a weatherproof design and covers 1-5/8 inch to 1-7/8 inch, and the DL3500CR Trilogy Grade 1 classroom lock with 300 user codes covers the same 1-5/8 inch to 1-7/8 inch range. Both are electronic keypad locks rather than mechanical keyed locksets.
28) What finishes does the Cal-Royal NM8473 dormitory mortise lock come in?
Six: US3 polished brass, US4 satin brass, US10B antique bronze oiled, US26 polished chrome, US26D satin chrome, and US32D satin stainless steel. Each is available in left hand and right hand and with either escutcheon or sectional trim, which is what makes it workable for standardizing a whole building on one lock and one look.
29) Is a Sargent 130KB mortise thumbturn a replacement for a dormitory lockset?
No. The Sargent 130KB is a standard duty mortise thumbturn for the 8200 Series, and the 130W is a standard duty mortise thumbturn with a round backplate for the 7800 Series. Those are trim pieces that operate a deadbolt already in the door, ordered when the existing thumbturn is damaged or being changed. The NM8473 is a complete mortise lockset with lock body, latch bolt, 1 inch throw deadbolt, and trim.
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Does the Cal-Royal NM8473-SS-RH-US26D come with a warranty?
Absolutely. The Cal-Royal NM8473-SS-RH-US26D is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
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