Schlage PM457 Grade 1 Classroo...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1,440.00
$900.99
Schlage PM457 Grade 1 Classroom Security with Deadbolt Mortise Lock, Keyed

Schlage PM457 Grade 1 Classroom Security with Deadbolt Mortise Lock, Keyed

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Model: PM457 ATHA 626
$1,440.00
$900.99
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$1,440.00
$900.99
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Schlage PM457 Grade 1 Classroom Security with Deadbolt Mortise Lock, Keyed

Grade 1, Mortise Locks Purpose-built to serve the commercial real estate, retail, multifamily and hospitality industries, Schlage Performance Series™ locks feature exceptional quality and style at a highly competitive price point. The PM Series offers 26 functions, including three electrified, and four mortise deadbolt functions, all made to meet Schlage’s rigorous quality standards. With popular levers and finish options, Schlage's full key system security line up, and its durable design, you can meet needs for both security and style. They are made to suite with other Allegion products to present a quality, complete door hardware solution and provide a consistent user experience throughout your building or complex. Better yet, you can suite the PM Series mortise locks with the PT Series tubular locks, as they share lever and rose styles.

 

PM457- Classroom Security Lock with Deadbolt

  • Key cylinder both sides; deadbolt and latchbolt
  • Latchbolt retracted by lever from either side
  • Outside lever is made inoperative when deadbolt is thrown by key from either side
  • Key either side retracts both latchbolt and deadbolt and unlocks outside lever
  • Rotating inside lever retracts both deadbolt and latchbolt and unlocks outside lever
  • Inside lever always free for immediate egress

 

Chassis

  • Case: Cold Rolled Steel (CRS) with corrosion resistant zinc dichromate plating
  • Case size: 4-7/16" x 6-1/16" x 1" (113 mm x 154 mm x 25 mm) Note: PM and L Series case and cover holes differ.
  • Spacing: lever to cylinder 3-7/8" (98 mm);  lever to thumbturn hub 2-11/16" (68 mm)
  • Door thickness: 1-3/4" (44 mm) standard; 1-3/8" (35 mm) minimum; fits doors up to 2-1/2" thick - specify door thickness if  over 1-3/4" and position in door (Available EE only)                                            
  • Field reversible handing

 

Trim Options

  • 10 lever designs made of zinc
  • N escutcheons: 7-7⁄8” x 2-1⁄2” x 7⁄16” (200 mm x 64 mm x 11 mm); wrought brass
  • Roses: A 2-1/8" (54 mm), B 2-9/16" (65 mm), C 2-5/8" (67 mm) - brass
  • Thumbturn style is ADA qualified

 

Latches, Armors, Strikes

  • Backset: 2-3/4" (70 mm) only
  • Armor: Standard - 1-1⁄4" x 8" x 7⁄32" (32 mm x 203 mm x 6 mm); Optional - 1-1⁄16" x 8" x 7⁄32"  (27 mm x 203 mm x 6 mm) 
  • Deadbolt: 1" (25 mm) throw stainless steel 
  • Latch: 3⁄4" (19 mm) throw stainless steel with anti-friction tongue
  • Strike: ANSI curved lip strike 1-1⁄4" x 4-7⁄8" (32 mm x 124 mm) standard; dust box included
  • Strike lip length: 1-3⁄16" (30 mm); optional strike lip lengths - 7⁄8", 1", 1-1⁄2", 1-3⁄4", and 2"  

 

DOWNLOADS & RESOURCES

Product Information

 

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Manufacturer Resources

Product Specs

Subcategory:
Mortise Locks
Product Group:
Mechanical Locks
Series:
PM Series
Grade:
Grade 1
Keyed Function:
Keyed
Handle Type:
Lever
Standard Strike:
10-072 1-1/4" x 4-7/8" Square Corner Strike, Box (1-3/16" Lip Length)
Warranty:
5 Year Limited
Keyed:
Yes
ANSI/BHMA:
F33
Product Subgroup:
Mortise Locks and Trim
Product Type:
Mortise Locks
Commercial/Residential:
Commercial
Lock Type:
Mortise
Lock Function:
Classroom
IMAP Policy:
Yes
Product Attribute:
Mortise Locks
Electronic:
No
Product Model:
PM457
Product Function:
Classroom
Door Hand Direction:
Field Reversible
Door Thickness Range:
1-3/4"
Product Category:
Mechanical Locks
Backset (Distance):
2-3/4"
Department:
Door Hardware

Schlage PM457 ATHA 626 – Frequently Asked Questions

1) How does the Schlage PM457 classroom security lock actually work from inside the room during a lockdown?
The PM457 is a classroom security function, so the room can be locked from inside without anyone stepping into the corridor. Key from either side throws the deadbolt, and with the deadbolt thrown the outside lever goes inoperative. The inside lever is always free, so egress is never blocked. Turning the inside lever retracts both the deadbolt and the latchbolt and unlocks the outside lever again. Key from either side does the same thing. There are cylinders on both sides, which is why a teacher can secure the door from within using their own key.
2) Will the Schlage PM457 mortise lock fit a 1-3/4 inch metal door with a 2-3/4 inch backset prep?
Yes. The PM457 is built for a 2-3/4 inch backset only, and 1-3/4 inches is the standard door thickness for it. The lock case measures 4-7/16 x 6-1/16 x 1 inch, so the mortise pocket has to suit. Minimum door thickness is 1-3/8 inches, and it will go up to 2-1/2 inches thick, but over 1-3/4 inches you have to specify the thickness and the position of the lock in the door, and that is only available on EE.
3) Do I have to order the Schlage PM457 handed, or is it field reversible?
No handing to specify. The PM457 chassis is field reversible, so one lock covers left and right hand openings and you can stock a single part number across a building instead of splitting inventory.
4) What do I need to decide about the cylinder when ordering a Schlage PM457?
Cylinder is a required choice on the PM457, with five options: P for a conventional 6-pin cylinder keyed 5, L for less conventional 6-pin cylinder, J for less FSIC, B for less SFIC, and T for an FSIC construction core. Pick P if you want it keyed and ready to hang. Choose L, J or B when your locksmith is supplying cylinders to match an existing keyway or master key system, and T when the building is still under construction and you want to swap to permanent cores at turnover.
5) Is the Schlage PM457 a Grade 1 lock and what ANSI function number is it?
Grade 1, and the ANSI/BHMA function is F33, the classroom security with deadbolt function. That is the designation to put on a hardware schedule when a spec calls out F33 for classroom doors.
6) What is the difference between the Schlage PM457 and a classroom mortise lock without a deadbolt, like the Cal-Royal NM8070 or Corbin Russwin ML2003?
The PM457 adds a 1 inch throw deadbolt on top of the latch, with cylinders both sides, which is what gives you the lockdown behavior: throw the bolt from inside and the outside lever dies. The Cal-Royal NM8070 and Corbin Russwin ML2003 are both Grade 1 classroom mortise locksets for 1-3/4 inch doors, but they are standard classroom function, keyed outside to lock and unlock the outside lever with no separate deadbolt. If the spec or the district policy calls for a classroom security lock that can be secured from inside the room, the deadbolt version is the one to buy.
7) What is the closest cross-brand equivalent to the Schlage PM457 classroom security mortise lock?
For a Grade 1 mortise classroom lock from another manufacturer, the Corbin Russwin ML2003 is the nearest match - it is a Grade 1 mortise classroom lockset in the ML2000 Series rated for 1-3/4 inch doors, the same nominal door thickness the PM457 is built around. The Cal-Royal NM8070 is also a Grade 1 classroom mortise lockset for 1-3/4 inch doors, with an auxiliary deadlatch. The difference to check before you swap: the PM457 is specifically a classroom security function with a 1 inch throw deadbolt in addition to the latchbolt, keyed both sides, so if the opening was specified for lockdown by key from either side, confirm the replacement carries a deadbolt function and not just a classroom latch.
8) Is there an electronic or credential-based alternative to the Schlage PM457 for classroom doors?
The PM457 is a mechanical lock, no electronics. If the building wants credentials or code-based access on classroom doors, TownSteel's FME-2000 Series is a Grade 1 heavy duty classroom mortise lockset with RFID, and the FME-4000 Series is an electronic intruder classroom mortise lock with RFID, both for 1-3/4 inch doors. Alarm Lock's DL3500CR is a Grade 1 classroom-function electronic mortise lock with 300 user codes, though it wants a 1-5/8 to 1-7/8 inch door. The tradeoff is batteries and programming versus a key-only lock that never needs either.
9) Can I use a Schlage L Series template to prep doors for the PM457?
No. PM Series and L Series case and cover holes differ, so an L Series prep will not line up. Use the PM Series templates. The PM457 case is 4-7/16 x 6-1/16 x 1 inch on a 2-3/4 inch backset.
10) Will the Schlage PM457 work on a door thicker than 1-3/4 inches, or do I need another lock?
The PM457 is built for 1-3/4 inch doors as standard, accepts 1-3/8 inch as a minimum, and fits doors up to 2-1/2 inches thick when door thickness and position in the door are specified. If you would rather not special-order for a thick door, the Hager 3800 Series mortise locks list a 1-3/4 to 2-1/2 inch door thickness range straight out, including the 3810E passage with escutcheon and the 3850E office function with lever and escutcheon, both on a 2-3/4 inch backset that matches the PM457. Note those Hager models are passage and office functions rather than classroom security with deadbolt.
11) What mortise lock should I use for a dormitory corridor rather than a classroom?
The Sargent 7925 is a Grade 1 heavy duty corridor/dormitory exit function mortise lock in the 7900 Series with rose trim and a single cylinder deadbolt. It is the closer fit where the deadbolt is thrown from inside the room by an occupant. The Schlage PM457 classroom security function is keyed on both sides - the deadbolt is thrown by key from either side, and turning the inside lever retracts both bolts and unlocks the outside lever - which is the behavior specified when staff, not occupants, control lockdown.
12) Is a BEST 45HCA intruder function lock the same thing as the PM457 classroom security lock?
No. The BEST 45HCA is a heavy duty mortise lock body with intruder function, which is designed to be locked from inside the room by the occupant during a lockdown, and BEST also offers the 45H heavy duty lock body in public entrance function with field reversible operation. The Schlage PM457 is a classroom security function: the deadbolt is thrown by key from either side, and only a key or the inside lever releases it. Both are field reversible for handing, but they answer different lockdown policies, so confirm which your district or facility standard calls for before substituting.
13) We use small format interchangeable cores in our facility - which mortise locks accept them?
The Schlage PM457 can be ordered less cylinder to suit your existing key system: cylinder options include less SFIC, less FSIC, less conventional 6-pin cylinder, an FSIC construction core, and a conventional 6-pin cylinder keyed 5. Among comparable mortise locksets, the Cal-Royal NM8080 Grade 1 storeroom is offered with an interchangeable core option, though that model is storeroom function rather than classroom security with deadbolt.
14) Is the Schlage LE Series mortise lock a substitute for the PM457?
They are graded differently. The Schlage Electronics LEBMB-ADD mobile-enabled mortise lock is Grade 2, carries a 3 hour fire rating, fits 1-3/4 inch doors and offers privacy, office and apartment functions. The Schlage PM457 is Grade 1 with a classroom security function and deadbolt. If your spec calls for Grade 1, the closer electronic option in the Schlage Electronics line is the LEMD-GRW ENGAGE Series wireless mortise lock, Grade 1 with a 3 hour fire rating, a 125 kHz proximity reader and a mobile enabled deadbolt with LED.
15) Are Baldwin 6301 and 6310 mortise lock bodies interchangeable with the Schlage PM457?
No, the backsets do not match. The Baldwin 6301 entry/apartment and 6310 entry/storeroom mortise lock bodies are built on a 2-1/2 inch backset, offered in knob by knob and lever by lever configurations. The Schlage PM457 is a 2-3/4 inch backset only, so the mortise pocket and cylinder location in the door are different. Choose based on what the existing door is prepped for rather than on function alone.
16) For a behavioral health or ligature-resistant opening, is the PM457 appropriate?
For anti-ligature openings, the TownSteel MRX-L-01 is a Grade 1 heavy duty stainless steel anti-ligature lever mortise lockset and the MRX-A-01 is the ligature resistant arch trim version in satin stainless steel, both passage function for 1-3/4 inch doors. Marks USA also offers the 5PDN, a Grade 1 hospital passage mortise push/pull paddleset that is ligature resistant and ADA compliant in satin stainless steel. The Schlage PM457 uses conventional zinc levers in ten designs, which is a different trim approach, though its thumbturn style is ADA qualified.
17) Is the thumbturn on the Schlage PM457 ADA qualified?
The thumbturn style used on PM Series mortise trim is ADA qualified, and the lock is lever operated rather than knob, which is what accessibility requirements call for on commercial openings. Note that the PM457 itself is keyed both sides for the deadbolt; the thumbturn spacing on the case is 2-11/16 inches from the lever hub, with lever to cylinder at 3-7/8 inches.
18) What is the lock case made of on the Schlage PM457, and will it hold up in a school corridor?
The case is cold rolled steel with corrosion resistant zinc dichromate plating, and both the deadbolt and the latchbolt are stainless steel. It is a Grade 1 commercial lock, the highest ANSI/BHMA durability grade, which is what high-traffic institutional corridors are specified to. The latch carries an anti-friction tongue to keep it retracting cleanly on doors that see constant use.
19) What is the difference between the PM457 and the Cal-Royal NM8440 privacy mortise lock, since both have a deadbolt?
Both carry a deadbolt, but the control is opposite. The Cal-Royal NM8440 is a Grade 1 privacy mortise lockset with deadbolt for 1-3/4 inch doors, intended for bed and bath openings where the occupant secures the door from inside. The Schlage PM457 is keyed on both sides: the deadbolt is thrown by key from either side and, once thrown, makes the outside lever inoperative. Specify the NM8440 for restroom and privacy openings and the PM457 where key control is required.
20) What is a good non-keyed mortise lock to pair with the PM457 on the same corridor for closets and passage doors?
For openings that need no locking, the Falcon MA101 is a Grade 1 heavy duty mortise passage lock, fire rated, with field reversible operation. Hager offers the 3810S passage with rose and the 3810E passage with escutcheon, both on a 2-3/4 inch backset matching the PM457. Keeping the same 2-3/4 inch backset across the corridor means a single door prep for the mortise pocket and one template set for the installer.
21) Can a Dormakaba E-Plex or PowerPlex mortise lock replace the PM457 on a classroom door?
They are keyless pushbutton locks rather than key-operated classroom security locks. The Dormakaba E-Plex 2066 is an electronic pushbutton keyless mortise lock built for wide stile doors, the PowerPlex P2066 is the self-powered counterpart in the PowerPlex 2000 Series, and the E5086 is a Grade 1 back-to-back pushbutton and card entry/egress mortise lock. The Schlage PM457 is a mechanical lock keyed both sides with a deadbolt, so it suites into an existing Schlage key system; the Dormakaba units are credential-managed at the lock.
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Can I return it if it doesn’t work for me?
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Does the Schlage PM457 ATHA 626 come with a warranty?
Absolutely. The Schlage PM457 ATHA 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 PM457 ATHA 626?
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