Falcon MA551 Grade 1 Single Cy...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$799.00
$304.78
Falcon Falcon MA551 Holdback Lock - Grade 1 Single Cylinder Mortise Lock FAL-MA551

Falcon MA551 Grade 1 Single Cylinder Mortise Holdback Lock with Heavy-Duty Construction

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Model: MA551P DG 626
$799.00
$304.78
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$799.00
$304.78
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Falcon MA551 Grade 1 Single Cylinder Mortise Holdback Lock with Heavy-Duty Construction

Professional-Grade Mortise Lock Solution for High-Traffic Commercial Applications

The Falcon MA551 delivers Grade 1 performance with heavy-duty construction designed for demanding commercial environments. This single cylinder mortise holdback lock features forged escutcheons for added strength, cold-formed steel components with zinc plating and dichromate coating for corrosion resistance, and field-reversible operation for installation flexibility. UL listed with 3-hour fire rating certification, the MA551 meets ANSI/BHMA 156.13 Series 1000 standards for reliable performance in office buildings, educational facilities, healthcare institutions, and other high-traffic commercial settings.

Professional Features & Benefits

  • Grade 1 Heavy-Duty Performance: ANSI/BHMA 156.13 Series 1000 certified construction delivers exceptional durability for high-traffic, high-abuse commercial environments.
  • Superior Construction Materials: Forged escutcheons and cold-formed steel components with zinc plating and dichromate coating provide enhanced strength and corrosion resistance.
  • Fire Safety Compliance: UL listed 3-hour A label fire rating ensures code compliance for fire-rated door applications in commercial buildings.
  • Field-Reversible Design: Easy re-handing capability allows installation flexibility without requiring different handed units for left or right swing doors.
  • Flexible Keying Options: Compatible with conventional cylinders or Small Format Interchangeable Core (SFIC) systems for easy re-keying in high-turnover environments.
  • Anti-Friction Latch System: 2-piece stainless steel field-reversible latch bolt ensures smooth operation and long-term reliability.
  • Comprehensive Trim Options: Wide variety of lever and knob styles with multiple finish options to match existing or new design environments.
  • Professional Installation Support: Meets ANSI Standard A115.1 for frame preparation with standard thumbturn-threaded cylinder compatibility.

Technical Specifications

  • Commercial/Residential: Commercial
  • Department: Door Hardware
  • Door Hand Direction: Field Reversible
  • Duty Level: Heavy Duty
  • Electronic: No
  • Fire Rating: Yes
  • Grade: Grade 1
  • Keyed: Yes
  • Keyed Function: Single Cylinder
  • Lock Type: Mortise
  • Product Attribute: Mortise Locks
  • Product Category: Mechanical Locks
  • Product Function: Holdback
  • Product Group: Mechanical Locks
  • Product Model: MA551
  • Product Subgroup: Mortise Locks and Trim
  • Product Type: Mortise Locks
  • Series: MA Series
  • Subcategory: Mortise Locks
  • UL Listing Type: UL listed 3-hour fire door, A label

Installation & Operation

  1. Review manufacturer specifications and verify door preparation requirements including door thickness, stile width, and handing as applicable to this product.
  2. Use manufacturer-provided templates to mark mounting hole locations accurately on door and/or frame surfaces.
  3. Prepare door and frame by drilling required holes and routing as specified in manufacturer instructions.
  4. Install all mounting hardware and secure the device to door and frame per manufacturer torque specifications.
  5. Adjust operational components for proper alignment, latching, and smooth operation throughout the full range of motion.
  6. Test device operation to verify proper function and make final adjustments as needed. Refer to manufacturer documentation for complete installation details and troubleshooting.

Professional Applications

  • Commercial Office Buildings
  • Educational Facilities
  • Healthcare Institutions
  • Retail Establishments
  • Industrial and Warehouse Facilities
  • Multi-Tenant Residential Properties
  • Government and Municipal Buildings

Why Choose Falcon Quality?

Falcon MA Series mortise locks deliver professional-grade reliability with forged escutcheons and cold-formed steel construction rated for Grade 1 heavy-duty performance. UL listed with 3-hour fire rating certification and ANSI/BHMA 156.13 Series 1000 compliance ensures dependable operation in the most demanding commercial applications. Engineered for high-traffic, high-abuse environments where consistent security performance is essential.

Product Specs

Product Group:
Mechanical Locks
Series:
MA Series
Grade:
Grade 1
Duty Level:
Heavy Duty
Keyed Function:
Single Cylinder
Subcategory:
Mortise Locks
Keyed:
Yes
Product Subgroup:
Mortise Locks and Trim
Product Type:
Mortise Locks
Lock Type:
Mortise
Commercial/Residential:
Commercial
Electronic:
No
UL Listing Type:
UL listed 3-hour fire door, A label
Product Attribute:
Mortise Locks
Product Model:
MA551
Product Function:
Holdback
Door Hand Direction:
Field Reversible
Fire Rating:
Yes
Product Category:
Mechanical Locks
Department:
Door Hardware

Falcon MA551P DG 626 – Frequently Asked Questions

1) What does the holdback function on the Falcon MA551 mortise lock actually do?
Holdback is the MA551's function: the latch can be held retracted so the door stays free-swinging until you release it, which is what you want on a door that needs to stand open through a busy part of the day and then get secured again. It is a keyed single cylinder lock, so the outside is controlled by one cylinder and there is no second cylinder on the inside.
2) Is the Falcon MA551 mortise lock fire rated for a labeled door?
Fire rated, and UL listed for a 3-hour A label fire door. That covers the stair and corridor openings in a commercial building where the door schedule calls out a 3-hour assembly. Note that a holdback function holds the latch retracted, so on a fire door the opening still has to meet the code requirements for hold-open on labeled doors.
3) Do I have to order a left hand or right hand Falcon MA551?
No handing to specify. The MA551 is field reversible, with a 2-piece stainless steel latch bolt that re-hands on site, so one unit covers left and right swing doors. For a property manager stocking spares across a building, that means a single part number on the shelf instead of two.
4) Can I put the Falcon MA551 on my existing Schlage C keyway master key system?
Yes, if you order the CP6 cylinder option: that is a conventional 6-pin cylinder cut to the Schlage C keyway, so it drops straight into an existing C keyway system. The other choices are P for a plain conventional 6-pin cylinder, L for less conventional cylinder, and B for less small format interchangeable core if you are supplying your own SFIC.
5) What do I need to specify when ordering a Falcon MA551?
Four choices plus keying. Cylinder (B, CP6, L or P), finish, lever style and trim style. Levers run Avalon, Boardwalk, Broadway, Dane, Latitude, Longitude, Quantum and Sutro; trim is Gala or Napa. Keying is a required selection: key different, key alike, key code, or none if you are going less cylinder. Pick key code and you supply the code with the order.
6) Is the Falcon MA551 heavy duty enough for a school or hospital corridor?
It is built for exactly that traffic. Grade 1, heavy duty, certified to ANSI/BHMA 156.13 Series 1000, with forged escutcheons and cold-formed steel parts finished in zinc plating and dichromate for corrosion resistance. Grade 1 is the top ANSI/BHMA tier for commercial locks and is what an institutional spec normally calls for.
7) Will the Falcon MA551 fit a standard ANSI mortise pocket, or do I need special frame prep?
Frame prep follows ANSI Standard A115.1, the standard mortise lock prep, so on a door and frame already cut for an ANSI mortise lock you are working to the same template rather than cutting a proprietary pocket. The cylinder side uses standard thumbturn-threaded cylinder compatibility.
8) I need a classroom function mortise lock for a school corridor - what takes the place of the Falcon MA551?
The MA551 is built as a holdback lock, not a classroom lock. For classroom function in a Grade 1 mortise body, the Cal-Royal NM8070 is a heavy duty Grade 1 classroom mortise lockset with auxiliary deadlatch for 1-3/4 inch doors, and the Corbin Russwin ML2003 is a Grade 1 mortise classroom lockset in the ML2000 Series, also listed for 1-3/4 inch doors. Both are mechanical like the MA551, so no power or credentials enter the picture.
9) What is the closest Grade 1 mortise lock to the Falcon MA551 if I need a storeroom function instead of holdback?
The Falcon MA551 is a holdback function mortise lock rated Grade 1. When the opening needs storeroom function - outside lever always locked, key retracts the latch, no holdback - the Accentra 8805FL is a Grade 1 storeroom mortise lock in the 8800 Series, and the Cal-Royal NM8080 is a Grade 1 storeroom mortise lockset with an interchangeable core option. Both stay in the same Grade 1 mortise class, so the door and frame prep stays in mortise territory; only the function changes.
10) We want keypad or card access on the same opening - what replaces the Falcon MA551?
The MA551 is a mechanical lock with no electronics, so credential access means a different body. The Alarm Lock DL3500CR is a Grade 1 electronic mortise lock with 300 user codes in classroom function for doors 1-5/8 inch to 1-7/8 inch. The Schlage CO-100 is a Grade 1 standalone electronic mortise lock with a keypad reader for 1-3/4 inch doors. For RFID, the TownSteel FME-2000 is a Grade 1 mortise lockset with RFID technology, also 1-3/4 inch. Each requires power and programming that a mechanical MA551 opening does not.
11) Is a Sargent 4874 mortise deadbolt a substitute for the Falcon MA551?
No. The Sargent 4874 is a double cylinder mortise deadbolt with a 2-3/4 inch backset in the 4870 Series - a deadbolt only, with no latch and no lever trim. The Falcon MA551 is a single cylinder mortise holdback lock supplied with lever and trim choices. If you pull an MA551 and drop in a 4874, the door has a bolt but nothing to latch it closed and no handle to operate. The Kaba Ilco 185 Series is likewise a deadbolt function mortise part, not a lockset.
12) Our behavioral health wing needs an anti-ligature lock - is the Falcon MA551 appropriate or should we specify something else?
Specify a ligature resistant body. The MA551 is a conventional lever and trim mortise lock offered with levers such as Avalon, Boardwalk, and Quantum, which present a projecting handle. For those openings the TownSteel MRX-L-01 is a Grade 1 heavy duty anti-ligature lever mortise lockset in stainless steel, passage function, and the MRX-A-01 is the same passage function with ligature resistant arch trim, both for 1-3/4 inch doors. The Marks USA 5PDN is a Grade 1 ligature resistant hospital passage push/pull paddleset in satin stainless.
13) I need the outside lever to unlock electrically from the access control panel - what mortise lock do I use instead of the Falcon MA551?
The MA551 is mechanical only. For an electrically controlled outside lever, the Schlage L9092EU 03A is a heavy duty corridor function mortise lock with electric lock/unlock of the outside lever, keyed outside, request to exit, on 12/24VDC for 1-3/4 inch doors. The Command Access ML190 is a heavy duty motorized storeroom mortise lock with field selectable fail safe or fail secure operation on 24VDC, and the BEST 45HW is a heavy duty wired electromechanical mortise lock running 12V or 24V. All three need power transfer to the door, which an MA551 opening will not already have.
14) Is a Schlage PC10 the same thing as a Falcon MA551?
No, and the door prep is the difference that matters. The Schlage PC10 is a Grade 1 passage cylindrical lock, non-keyed with rose, for 1-3/4 inch doors - cylindrical, meaning a bored hole through the door face. The Falcon MA551 is a mortise lock, which needs a pocket routed into the door edge. Both are Grade 1, but a door prepped for one will not accept the other without new prep.
15) We need a 3-hour fire rated mortise lock - does an electronic lock give us the same rating as the Falcon MA551?
The Falcon MA551 is UL listed for 3-hour fire door, A label. Among electronic mortise locks, the Schlage LEMD-GRW is a Grade 1 ENGAGE Series wireless mortise lock with a 3 hour fire rating and a 125kHz proximity reader, and the Schlage LEBMB-ADD is mobile enabled with a 3 hour fire rating but is Grade 2 rather than Grade 1. If the specification calls for Grade 1 at a 3-hour opening, the LEBMB grade is the detail to check before substituting.
16) Should I buy the MA551 less cylinder if my locksmith cores everything on site?
Order it less cylinder. Two ways to do that on the MA551: B leaves it prepped for a small format interchangeable core you supply, and L leaves it less the 6-pin conventional cylinder. SFIC is the usual pick in high-turnover buildings because a core swap re-keys a unit in seconds instead of pulling the lock apart.
17) What finishes does the Falcon MA551 mortise lock come in to match the rest of my building?
Nine BHMA finishes on the MA551: 605 bright brass, 606 satin brass, 613 oil-rubbed satin bronze, 619 satin nickel, 622 matte black, 625 bright chrome, 626 satin chrome, 630 satin stainless and 643E aged bronze. 626 satin chrome and 630 satin stainless are the two that usually match an existing commercial opening.
18) Can I get the Falcon MA551 with a keypad or card reader?
No. The MA551 is a mechanical lock with no electronic option, key operated only. For access control on a mortise prep, look at the BEST 45HZ EZ Series keypad mortise lock with key override, the Schlage Electronics LEMD-GRW Grade 1 ENGAGE wireless mortise lock with a 125kHz proximity reader, or the TownSteel FME-2000 Series Grade 1 RFID mortise lockset for 1-3/4 inch doors.
19) Can I order several Falcon MA551 locks keyed alike for one building?
Yes. Keying is a required selection and key alike is one of the choices, so a run of MA551 locks can all operate on one key, which is the usual ask when a maintenance crew covers multiple doors. Key different gives each lock its own key, and key code lets you supply an existing code so new locks join a system already in the building.
20) Which mortise lock should I use instead of the Falcon MA551 on a restroom or bedroom door that needs privacy?
The MA551 is a keyed single cylinder lock, which is not what a privacy opening wants. For privacy function, the Cal-Royal NM8440 is a Grade 1 privacy mortise lockset with deadbolt for 1-3/4 inch doors, and 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. Both give the inside-turn, no-key-outside arrangement a bed or bath door is specified for.
21) If the door does not need to lock at all, is there a simpler alternative to the Falcon MA551?
Yes. The MA551 is a keyed lock, so on a closet, hall, or other opening that only needs latching, a non-keyed mortise body is the simpler part. The Schlage PM010 is a Grade 1 passage latch mortise lock, non-keyed, for 1-3/4 inch doors, and the Hager 3810S is a passage mortise lock with rose trim and a 2-3/4 inch backset for doors 1-3/4 inch to 2-1/2 inch. The Hager 3810E is the same passage function with escutcheon trim rather than a rose.
22) Can I order an Emtek 3104 Hamilton or a Schlage L0170 in place of the Falcon MA551?
Not as a working lock. The Emtek 3104 Hamilton mortise entrance lockset and the Emtek 3102 Memphis are dummy function - trim that does not operate a latch. The Schlage L0170 is a Grade 1 non-keyed half dummy trim in the L Series for 1-3/4 inch doors. The Falcon MA551 is a keyed single cylinder mortise lock. Dummy parts are for the inactive leaf of a pair or a fixed panel; they will not secure or latch an active opening.
23) What is the difference between ordering a Falcon MA551 and ordering a BEST 45H mortise lock body?
The Falcon MA551 is supplied as a complete holdback lockset - lock, lever style such as Latitude or Sutro, Gala or Napa trim, and a finish choice from 605 Bright Brass through 630 Satin Stainless. The BEST 45HCAC is a heavy duty mortise lock body in public entrance function with field reversible operation, and the 45HCAINL is a heavy duty mortise lockbody in intruder function; a lock body is the case alone, so trim is ordered separately. The MA551 is also field reversible, so handing is set at install on either.
24) Can I put a Falcon MA551 on a 1 inch ornamental iron stile door?
The MA551 is a heavy duty commercial mortise lock built for standard commercial door prep. For narrow ornamental iron doors the Marks USA 21AC is an entrance double cylinder Unilock ornamental iron mortise lock with round knob for 1 inch doors, and the 22AC is the same style entrance double cylinder ornamental iron mortise lock for 1 inch doors. For an all-glass door the Kaba Ilco BR Series is a glass door bottom rail lock. Those bodies are sized for the stile the MA551 case was not cut for.
25) For a dormitory or apartment entrance, what mortise lock should I look at next to the Falcon MA551?
The MA551 is a single cylinder holdback lock. For dormitory openings the Sargent 7925 is a Grade 1 heavy duty corridor/dormitory exit function mortise lock with rose trim and a single cylinder deadbolt in the 7900 Series. For apartment entrances, the Baldwin 6301LS is an entry/apartment lever by lever mortise lock body with a 2-1/2 inch backset for doors 1-3/4 inch and over, and the 6301 is the same function in knob by knob. The Sargent adds a deadbolt the MA551 holdback body does not carry.
26) Is a Codelocks CL2255 a lighter duty option than the Falcon MA551?
They are built to different duty levels. The Falcon MA551 is heavy duty, Grade 1 commercial. The Codelocks CL2255 is an electronic tubular mortise latch in the CL2000 Series rated medium duty, in a brushed steel finish. On a high-traffic commercial entry specified Grade 1, the medium duty rating is the point to confirm against the drawing before swapping.
27) I want a mortise lock with an office or entrance function instead of the Falcon MA551 holdback - what are my options?
The Cal-Royal NM8050 is a heavy duty Grade 1 office/entrance mortise lockset with auxiliary deadlatch for 1-3/4 inch doors. The Hager 3850E is a Grade 1 office mortise lock with lever and escutcheon, non-keyed, 2-3/4 inch backset, for doors 1-3/4 inch to 2-1/2 inch - note it is the non-keyed version, where the Falcon MA551 is keyed single cylinder. The Baldwin 6310 covers entrance/storeroom in a knob by knob body with a 2-1/2 inch backset for doors 1-3/8 inch and over.
How fast can I get the Falcon MA551P DG 626 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 Falcon MA551P DG 626 come with a warranty?
Absolutely. The Falcon MA551P DG 626 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 Falcon MA551P DG 626?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Falcon MA551P DG 626 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.

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