Schlage Locknetics M422P Electromagnetic Double Lock - 500 Lb. Hold W/ DSM - MBS - RTD

The Schlage Locknetics M422P is the Plus-series electromagnetic lock for double-door applications in the M400 Series, delivering 500 lbs hold force per door leaf (1,000 lbs combined across both doors) in a single aluminum housing. The "P" suffix means this variant includes all three monitoring features built in: Magnetic Bond Sensor (MBS) for real-time bond verification, Door Position Switch (DPS) for open/closed status, and Relock Time Delay (RTD) adjustable from 0.5 to 30 seconds. 

What Is the Schlage Locknetics M422P Maglock

The M400 Series is the current-generation electromagnetic lock line from Schlage, part of Allegion's commercial access control hardware catalog. These are the modern replacement for the legacy Locknetics maglocks, which were folded into the Schlage brand after Allegion acquired the Locknetics line. Older facility managers, integrators, and spec writers still search for "Locknetics maglocks" when they need to replace or expand an existing installation — they're looking for exactly this product, just under the old brand name. The M422P is the double-door variant (M422 = double, M420 = single) with the "Plus" monitoring package pre-installed, which means you don't need to order separate MBS, DPS, or RTD accessories. Standard applications include healthcare facility security doors, office tower perimeter access, multi-tenant building lobbies, data center entrances, government building checkpoints, and any double-door opening that needs electric lock control with full status monitoring for the access control head-end.

M422P Specifications

Full specs for the integrator or spec writer:

• Application: double-door electromagnetic lock, single housing spanning both door leaves

• Hold force: 500 lbs per door leaf (meets or exceeds BHMA 500 lb standard)

• Input voltage: automatic selection between 12 VDC and 24 VDC

• Current draw: 1.5A at 12 VDC, 0.76A at 24 VDC (standard unit)

• Polarity protection: built in

• Dimensions: 2-1/2" H × 18-1/16" L × 1-3/8" D

• Operating temperature: 32 to 120 degrees F (0 to 49 degrees C)

• Wire gauge: 14 to 22 AWG

• Handing: symmetrical design, field-selectable (no need to specify left or right at order)

• Armature: pivot feature compensates for slight door opening imperfections

• Monitoring included (the "P" in M422P): Magnetic Bond Sensor (MBS), Door Position Switch (DPS), Relock Time Delay (RTD) adjustable 0.5 to 30 seconds

• Housing: aluminum, 628 Satin Aluminum finish

• Certifications: ANSI/BHMA 156.23 Grade 1, UL 1034, UL 10C, cUL, CFSM

• Warranty: limited lifetime on magnetic coil assembly

What the MBS, DPS, and RTD Features Actually Do

These three acronyms are the entire reason to buy the M422P over the standard M422. Magnetic Bond Sensor (MBS) monitors the actual bond strength between the magnet and armature in real time. It doesn't just tell the access control panel "power is on" — it tells the panel "the door is actually magnetically bonded." If someone wedges a shim between the magnet and armature to defeat the lock, the MBS reports a weak bond and the panel can trigger an alarm. Standard maglocks without MBS will happily report "locked" even when they're not actually holding the door. Door Position Switch (DPS) is a magnetic sensor that monitors whether the door leaf is open or closed, completely separate from the magnet bond. Access control panels use this for propped-door alarms, audit trails, and request-to-exit verification. Relock Time Delay (RTD) lets you set an adjustable delay from 0.5 to 30 seconds after the door closes before the magnet re-energizes, which eliminates the "clunk" of immediate relocking and accommodates users who open and close the door quickly in succession.

M420 vs M420P vs M422 vs M422P (Which Model Fits)

The M400 Series covers four configurations. Schlage Locknetics M420 is the single-door standard model at $586.70, basic 500 lb hold, no monitoring. Schlage Locknetics M420P is the single-door Plus model at $807.18, single door with MBS/DPS/RTD. Schlage Locknetics M422 is the double-door standard at $1,238.82, 500 lb per leaf without monitoring. M422P (this product) is the double-door Plus at $1,657.26, 500 lb per leaf with all three monitoring features. If you're running an access control system that accepts MBS/DPS inputs (Lenel, Software House C-Cure, S2, Genetec, Avigilon, Honeywell, or any commercial head-end), spec the Plus models. If you're running a simple keypad or card reader with no head-end integration, the standard M420 or M422 saves budget. For higher hold force, step up to the M450/452 (1,000 lbs) or M490/492 (1,500 lbs) series.

Mounting Options and Accessories

The M422P supports multiple mounting configurations via optional kits. Herculite glass doors (frameless glass entries common in office lobbies) require the HDB420-2 Herculite Door Bracket at $786.72, specifically designed for the M422/M422P double-door configuration. Top jamb / inswinging doors require the TJ422 Top Jamb Kit at $357.72. Angle brackets for non-standard frame geometries include the 4202A 1-1/2" x 1" Angle Bracket and 4204A 1-1/2" x 2" Angle Bracket. For extended reveal applications, the 4204F 9" Filler Plate at $83.16 closes gaps between the magnet and frame. One paid upgrade available at checkout: the ATS/LED option (+$111) adds an anti-tamper switch to detect unauthorized cover removal plus a visible LED bond indicator on the magnet face — useful for high-security applications where you want installers and security staff to see bond status without a head-end monitor.