Schlage Residential F51A Plymo...
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$74.00
$46.86
Schlage Residential Schlage Residential F51A - Entry Lock - Plymouth Knob, C Keyway with 16211 Latch and 10063 Strike SCR-F51A-KEYED-PLY

Schlage Residential F51A Plymouth Knob Entry Lock with C Keyway

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Model: F51A PLY 626
$74.00
$46.86
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$74.00
$46.86
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Schlage Residential F51A Plymouth Knob Entry Lock with C Keyway

Professional Residential Entry Lock Solution

The Schlage Residential F51A Plymouth Knob Entry Lock delivers Grade 2 commercial-quality security for residential applications. This single cylinder entry lock features a 1" x 2-1/4" latch with dual backset compatibility for 2-3/8" or 2-3/4" installations, accommodating door thicknesses from 1-3/8" to 1-3/4". The lock includes a 5-pin C keyway cylinder with keyed alike (KA4) configuration and comes complete with 16211 latch and 10063 strike components.

Professional Features & Benefits

  • Dual Backset Compatibility: Universal latch fits either 2-3/8" or 2-3/4" backsets for flexible installation options.
  • Door Thickness Range: Accommodates doors from 1-3/8" to 1-3/4" thick for versatile residential applications.
  • Grade 2 Commercial Construction: ANSI/BHMA Grade 2 certification provides commercial-quality durability for demanding residential use.
  • Complete Latch Assembly: Includes 1" x 2-1/4" latch with 1/4" radius corner faceplate and 7/8" housing diameter with 1/2" throw.
  • Professional Strike Plate: Full lip radius strike measuring 1-5/8" x 2-1/4" ensures secure door frame engagement.
  • 5-Pin Security Cylinder: C keyway configuration with keyed alike (KA4) system includes two keys per lock for convenient access management.
  • Easy Installation: Simple 3-step installation process requires only a screwdriver for quick professional setup.
  • Manufacturer Warranty: 10 Year warranty coverage provides long-term confidence and protection.

Standard Features

Certification: ANSI/BHMA A156.2-2017 Commercial Grade 2; ANSI/BHMA A156.39-2015 Residential Grade AAA; Available UL Listed for 3-hour fire door (F10, F40 (CSV Only), F51A, F80 functions).
Latch: 1"x 2-1/4", 1/4" radius corner faceplate, 7/8" housing diameter, 1/2" throw, circular drive-in included, universal latch
Strike: 1-5/8" x 2-1/4" radius corner, full lip, no box
Backset: Dual backset latches, fits either 2-3/8" or 2-3/4" backsets
Cylinder: 5-Pin, C keyway, keyed alike (KA4)
Door Range: 1-3/8" – 1-3/4"
Keys: Two per lock, 5-pin, C section

Installation & Operation

  1. Review manufacturer specifications and verify door preparation requirements including door thickness between 1-3/8" and 1-3/4", and select appropriate backset (2-3/8" or 2-3/4").
  2. Use manufacturer-provided templates to mark mounting hole locations accurately on door surfaces for the cylindrical lock installation.
  3. Prepare door by drilling the required 2-1/8" cross bore hole and 1" edge bore hole, ensuring proper alignment and smooth finish.
  4. Install the latch assembly into the edge bore hole and secure the strike plate to the door frame using provided fasteners.
  5. Mount the lock mechanism through the cross bore hole and secure both interior and exterior components per manufacturer torque specifications.
  6. Test lock operation with provided keys to verify proper cylinder function, latch engagement, and smooth knob operation. Refer to manufacturer documentation for complete installation details and troubleshooting.

Professional Applications

  • Residential Entry Doors
  • Single Family Home Security
  • Apartment and Condominium Units
  • Townhouse and Duplex Properties
  • Rental Property Management
  • Home Office and Study Rooms
  • Master Suite Privacy Applications

Why Choose Schlage Residential Quality?

Schlage Residential F Series locks deliver professional-grade reliability with zinc and steel construction rated to ANSI/BHMA Grade 2 commercial standards. The 10 Year manufacturer warranty provides added confidence for long-term residential security applications. Engineered for demanding residential use where dependable entry control and classic design aesthetics are essential.

ANSI/BHMA Grade 2 rated mechanical knob or lever with solid brass construction and SecureKey re-keyable cylinder. Support Resources: Manuals Hub: Schlage Manuals, Installation Guides & Templates (https://www.schlage.com/en/home/support/installation-manuals-templates.html) || Installation Guides: F-Series Knob and Lever Installation Instructions (https://www.schlage.com/content/dam/sch-us/documents/pdf/installation-manuals/P515-302.pdf) || Door Prep Templates: F10/F40/F51 Knob and Lever Door Prep Template (https://www.schlage.com/content/dam/sch-us/documents/pdf/installation-manuals/P513-593.pdf) || FAQs & Support: Schlage Product FAQs (https://www.schlage.com/en/home/support/faqs.html)

Manufacturer Resources

Product Specs

Series:
F Series
Subcategory:
Bored Locksets
Grade:
Grade 2
Warranty:
10 Year
Standard Strike:
10-027: Full Lip Radius Strike, 2-1/4" x 1-5/8"
Standard Latch:
16-086: Dead Latch, Dual Option (Round, Drive-in)
Keyed Function:
Single Cylinder
ANSI/BHMA:
F81
Product Group:
Mechanical Locks
Product Subgroup:
Bored Locksets
Keyed:
Yes
Electronic:
No
Commercial/Residential:
Residential
Function Description:
Keyed entry function unlocks when door is opened from the inside, allowing you to leave quickly, conveniently and re-enter easily; Locked by inserting key and rotating cylinder from outside, or manually rotating interior turnbutton after exit
Lock Type:
Cylindrical
Lock Function:
Single Cylinder
Product Type:
Bored Locksets
Handle Design:
Plymouth Knob
Handle Type:
Knob
Product Attribute:
Cylindrical Locks
Product Model:
F51A
Product Function:
Entrance
Door Hand Direction:
Non-Handed
Door Thickness Range:
1-3/8" to 1-3/4"
Product Category:
Mechanical Locks
Product Substrate:
Zinc and Steel
Department:
Door Hardware

Schlage Residential F51A PLY 626 – Frequently Asked Questions

1) Will the Schlage F51A Plymouth knob fit a 2-3/8 inch backset, or do I need to know the backset before I order?
Backset isn't something you have to specify. The F51A ships with a dual-option dead latch that adjusts to either a 2-3/8 or a 2-3/4 inch backset, so one part covers both of the standard bored-door preps. Same latch works as a round-face or a drive-in, so it suits either a mortised faceplate prep or a plain 1 inch edge bore with no faceplate mortise.
2) What door thickness and bore does a Schlage F51A entry knob need?
Doors from 1-3/8 to 1-3/4 inches thick, which covers both the common older interior slab and a standard exterior door. Prep is a 2-1/8 inch cross bore through the face and a 1 inch bore in the edge. If your door is already drilled for a standard cylindrical lockset, that is the prep the F51A drops into.
3) Does the Schlage F51A knob need to be handed for a left or right hand door?
No handing to call out. The F51A is non-handed, so the same lock works on a left or right hand door swinging in or out. That is one less thing to get wrong when you are ordering a batch of them for units that don't all swing the same way.
4) Will a Schlage F51A latch into the strike plate already in my door frame?
The dead latch has a 1/2 inch throw and the lock comes with its own 10-027 full lip radius strike measuring 2-1/4 by 1-5/8 inches, with no box. If your frame already has a strike of that size with a radius corner, the new latch will engage it. Frames prepped for a square-corner strike or a deeper box strike want the supplied strike installed instead, which is a straight swap in the same frame mortise in most residential jambs.
5) How does the Schlage F51A entry function actually work from the inside?
Keyed entry, single cylinder. The outside knob locks by key from outside or by turning the interior turnbutton before you leave. From inside, opening the door releases the lock, so you are never trapped behind it and you don't have to remember to unlock on the way out. No key on the inside face, which is why it belongs on a unit entry door and not on a door where you want key control from both sides.
6) Is a Schlage F51A knob tough enough for apartment turnover and rental units?
It is ANSI/BHMA Grade 2, certified to A156.2-2017 as commercial Grade 2 and to A156.39-2015 residential Grade AAA, with zinc and steel construction. Grade 2 is the middle commercial tier, above the Grade 3 typically spec'd for interior residential, so it holds up to the cycle counts a rented unit door sees. For a multi-family building standardizing on one entry lock, that grade plus the F81 entrance function is the usual spec.
7) Can I get all the Schlage F51A locks on a building keyed to one key?
Yes. Keying is a required choice on the order: keyed different for individual units, or keyed alike when you want a group of locks running on one key. Pick keyed alike for the set you want matched, and if you are adding to an existing Schlage system you can supply the key code so the new locks cut to the keys already in the field. Cylinder is 5-pin C keyway with two keys per lock.
8) What is the closest Grade 2 alternative to the Schlage F51A Plymouth knob entry lock if I want a handleset instead of a knob on the exterior?
The Delaney Katana 400-KA is a Grade 2 single cylinder handleset with interior trim, so it carries the same ANSI/BHMA Grade 2 rating and the same single cylinder keyed arrangement as the Schlage F51A, but presents a gripped handle and thumbpiece on the exterior face rather than the F51A Plymouth knob. Choose the F51A where the opening is bored for a knob and you want knob trim on both sides; choose the Katana handleset where the exterior calls for a full escutcheon and handle. The Bravura Savannah 913, Jacksonville 915 and Austin 971 handlesets are also Grade 2 and pair a 615 interior plate with a 906-Macon interior knob, which keeps a knob on the inside of the door while changing the exterior to a handleset.
9) Is a Grade 3 handleset like the Callan Visconti an equivalent swap for a Schlage F51A entry knob?
They are not equivalent on two counts. The Schlage F51A is rated ANSI/BHMA Grade 2, while the Callan Visconti and Callan Briona single cylinder handlesets are Grade 3, so a facility standardizing on Grade 2 entry hardware will not meet that standard with either Callan. The F51A is also a cylindrical bored lockset with a Plymouth knob, which fits a standard knob bore, whereas the Callan units are handlesets with interior trim and require the door face prep a handleset needs. If the specification on the drawing calls out Grade 2, the Grade 2 alternates are the Delaney Katana 400-KA and the Bravura Savannah, Jacksonville, Austin and Montgomery handlesets.
10) The door already has a deadbolt and I only need a latching knob, no key. What replaces a Schlage F51A entry lock in that case?
The Emtek Select Brass Conical Stem Dark Walnut knob is a passage, hall and closet function knob, meaning it latches the door but has no cylinder and no locking. The Schlage F51A is a keyed single cylinder entry lock whose function unlocks when the door is opened from the inside and locks by key from outside or by the interior turnbutton. If the keying on the opening is handled by a separate deadbolt and the knob only needs to hold the door closed, the Emtek passage knob covers it; if you still need the knob itself to lock, the F51A is the one to keep, since a passage knob cannot be keyed later.
11) Can a Delaney 200-B deadbolt be used in place of a Schlage F51A entry knob lock?
No, they do different jobs on the door. The Delaney Traditional 200-B is a Grade 3 single cylinder deadbolt with a cylinder by thumbturn function, so it throws a bolt but provides no handle and no latch to hold the door shut. The Schlage F51A is a cylindrical entry lockset with a Plymouth knob and a keyed single cylinder, giving both the operating handle and the latch. The two are commonly ordered together rather than as substitutes, with the F51A working the door and a deadbolt adding the bolt. The Delaney Contemporary 200-LTR is the round rose version of the same Grade 3 cylinder by thumbturn deadbolt if the trim shape matters.
12) We are moving a building to credential access. Does the Paxton PaxLock Pro replace a Schlage F51A on those doors?
It changes how the door is controlled rather than matching the F51A. The Schlage F51A is a non-electronic mechanical lock keyed to a single cylinder, opened with a key. The Paxton PaxLock Pro 900-620WT-US is a battery powered lever latch lock with a dual frequency reader at 13.56 MHz and 2.4 GHz, Bluetooth and AES128 encryption, so access is granted by credential instead of by key. Note the door prep difference before you swap a run of openings: the PaxLock Pro is specified for 1-3/4 inch door thickness, while the F51A covers doors from 1-3/8 inch to 1-3/4 inch, so any thinner leaves in the building still need the mechanical lock. The PaxLock Pro is also a lever, not a knob.
13) Can I order the Schlage F51A without a cylinder so my locksmith can key it into our masterkey system?
Yes, there is a less-cylinder option on the keying selection alongside keyed different and keyed alike. Locksmiths and integrators standardizing a property on their own C keyway system usually take that route and pin the cylinders in the shop. If you are not running a master system, keyed different is the standard pick.
14) Can a Schlage F51A go on a 3-hour fire rated door?
The F51A function is among those available UL Listed for a 3-hour fire door. Note the wording: it is an available listing on that function, so if the opening is a rated one, that has to be called out on the order rather than assumed on any F51A you happen to pull off the shelf.
15) What is the difference between the rose designs on the Schlage F51A Plymouth knob, and does it change the door prep?
The Plymouth is the knob itself, a smooth round ball knob; the rose is the trim plate it sits on. Four are offered: Kinsler, Addison, Camelot and Collins. That choice is cosmetic and does not change the 2-1/8 inch cross bore or the backset, so you can run different roses across a property and still hold one door prep and one latch.
16) What finishes does the Schlage F51A Plymouth entry knob come in for matching existing hardware?
Nine finishes: 505 Lifetime Brass, 605 Bright Brass, 609 Antique Brass, 619 Satin Nickel, 620 Antique Nickel, 622 Matte Black, 625 Bright Chrome, 626 Satin Chrome and 716 Aged Bronze. Those are the standard BHMA finish codes, so 626 satin chrome or 619 satin nickel on the F51A matches hinges and closers carrying the same number elsewhere in the building.
17) Should I use a knob entry lock like the Schlage F51A or a handleset on a front door?
The F51A is a bored knob lock, one hole set, one lock, keyed entry with a 1/2 inch latch. It is the workhorse for unit doors, side and rear entries, and rental turnover. A handleset is a two-piece exterior trim with a thumb-latch grip over a separate deadbolt, and it is what people want on a street-facing front door for the look and the deadbolt security. If that is the job, look at the Grade 2 Bravura Savannah 913 or Jacksonville 915 handlesets, or the Grade 2 Delaney Katana. Where lever operation is required rather than a knob, a knob will not satisfy that.
18) I need something stronger than a Grade 3 residential lock but not a full commercial lockset. Is the F51A the right step up?
That is the gap the F51A sits in. It carries a Grade 2 rating on a residential product, where a lot of the alternatives in the same price class, like the Callan Visconti and Briona handlesets or the Delaney Traditional and Contemporary deadbolts, are Grade 3. If you want the same Grade 2 level in a handleset instead of a knob, the Bravura Savannah, Jacksonville, Austin and Montgomery sets and the Delaney Katana are Grade 2.
19) Can the Schlage F51A be tied into an access control or fob system?
No. The F51A is a purely mechanical keyed lock, no electronics, no credential reader and no wiring provision. If the opening needs fob or card access, that is a different product entirely, such as the Paxton PaxLock Pro Galaxy lever latch lock, which is battery powered with a dual frequency 13.56 MHz and 2.4 GHz reader plus Bluetooth, and fits a 1-3/4 inch door. Note that is a lever, not a knob.
20) Is a Schlage F51A knob a direct replacement for an older Schlage F Series entry knob?
If what is coming off is an F Series bored entry lock, yes, the prep is the same and the F51A drops straight in. The dual backset latch handles either 2-3/8 or 2-3/4 inch without you measuring first, the door can be anywhere in the 1-3/8 to 1-3/4 inch range, and it is non-handed. Keep the existing keyway by ordering C keyway and supplying your key code, and the new lock runs on the tenants' current keys.
21) I need a lever instead of a knob for accessibility on an entry door. What comparable options use a lever?
The Schlage F51A is a knob type handle, so it does not answer a lever requirement. Among the comparable entry hardware, the Bravura 973-Montgomery handleset pairs a 672 interior plate with a 939-Charlotte interior lever, putting a lever on the inside face of the door while keeping a Grade 2 rating that matches the F51A. The Paxton PaxLock Pro 900-620WT-US is also a lever, in its case a battery powered lever latch lock with credential reader rather than a keyed mechanical lock. Both change the trim type, so confirm the door prep and the interior hardware the occupant will actually touch before ordering.
22) Which entry hardware should I standardize on across a multi-family property if I want one Grade 2 platform?
The Schlage F51A carries an ANSI/BHMA Grade 2 rating and is non-handed, so a single part covers both left and right hand openings across a building. If some doors need a handleset appearance instead of a knob, the Grade 2 peers that hold the same grade are the Delaney Katana 400-KA single cylinder handleset and the Bravura Savannah 913, Jacksonville 915, Austin 971 and Montgomery 973 handlesets. The Bravura 913, 915 and 971 carry a 906-Macon interior knob, which keeps the interior feel consistent with the F51A knob trim, while the Montgomery 973 uses a 939-Charlotte interior lever. Keep the Callan Visconti and Briona out of a Grade 2 standard, since both are Grade 3.
23) What is the difference between the Delaney Avino 400-AV and the Delaney Katana 400-KA as alternatives to a Schlage F51A?
Both are Delaney single cylinder handlesets with interior trim, and both are keyed single cylinder like the Schlage F51A, but they differ in rating: the Katana 400-KA is Grade 2, matching the F51A, while the Avino 400-AV is Grade 3. If the F51A was specified because of its Grade 2 rating, the Katana is the one that holds that line. Either handleset changes the door face from the F51A cylindrical knob prep to a handleset prep, so verify the existing bore before substituting on an occupied opening.
24) What do I need on hand to install a Schlage F51A on a door that is already bored?
A screwdriver. On an existing 2-1/8 inch cross bore with a 1 inch edge bore, the latch goes in the edge, the lock body comes through the face from both sides, and the strike screws to the jamb with the supplied fasteners. Latch and strike are both in the box. Only a new door or a re-bore needs the drilling step, and Schlage publishes a door prep template for the F10, F40 and F51 knob and lever preps.
How fast can I get the Schlage Residential F51A PLY 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 Schlage Residential F51A PLY 626 come with a warranty?
Absolutely. The Schlage Residential F51A PLY 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 Schlage Residential F51A PLY 626?
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