Which Maglock Force Rating Does Your Opening Actually Need?
This article helps contractors, facility managers, and security integrators understand the practical differences between 600, 1200, and 1500 pound electromagnetic lock force ratings -- and how to match the right holding force to the opening, the traffic load, and the access control system. Getting this wrong means either an underperforming lock that fails under pressure or an over-specified unit that wastes budget and creates mounting headaches.
What Is Magnetic Lock Holding Force?
Holding force is the rated pull-apart strength of an electromagnetic lock -- the minimum force required to separate the magnet body from its armature plate when the lock is fully energized. Most commercial single-door maglocks are published with a minimum holding force rating. A 1200 lb maglock, for example, will resist at least 1200 pounds of direct pull when properly aligned and powered at the correct voltage. The higher the rating, the more resistance the lock presents to forced entry or crowd pressure.
One important exception: some smaller cabinet-style units are rated as a maximum holding force, not a minimum -- so read the spec sheet carefully and confirm which convention applies before comparing models.
The Three Common Force Tiers -- and What Drives Them
600 lb Maglocks: Interior Access Control and Low-to-Moderate Traffic
A 600 lb single electromagnetic lock is the most common spec for interior controlled openings in commercial buildings. Think interior stairwell doors, office suite entries, school corridor access points, and retail stockroom doors where the primary goal is access management rather than forced-entry resistance.
- Well-suited for interior hollow metal and aluminum-frame doors up to standard commercial widths
- Smaller magnet body means easier header mounting where frame depth is limited
- Double-door configurations are available: a 600 lb double (600D) applies one magnet to each leaf, giving independent holding on both sides of a pair
- Commonly used in schools, medical office buildings, and retail back-of-house
If your opening sees moderate foot traffic, is interior, and the threat model is unauthorized access rather than physical attack, a 600 lb unit is usually the correct starting point.
1200 lb Maglocks: High-Traffic, Exterior, and Higher-Security Interiors
The 1200 lb single maglock is the workhorse of commercial security hardware. It handles heavier doors, exterior applications, and openings where crowd pressure or a determined intruder is a realistic concern.
- Standard spec for exterior building entries, parking garage pedestrian access, and loading dock control doors
- Required on heavy steel or solid-core wood doors where door weight and leverage multiply the effective pull
- Used in healthcare facilities at controlled egress points, behavioral health unit entries (where code allows electromagnetic locking), and data center anteroom doors
- Industrial facilities use 1200 lb units on perimeter doors, guard stations, and secure equipment rooms
- Double configurations (1200D) apply separate 1200 lb magnets to each leaf of a wide pair -- useful on oversized openings in warehouses or institutional buildings
- Weather-proof variants (sealed stainless housing) extend the 1200 lb rating to outdoor gate applications
Current draw on a properly wired 1200 lb unit at 24 VDC is typically in the 200 mA range per magnet -- confirm with the specific product sheet, since power supply sizing depends on the total lock count on the circuit.
1500 lb Maglocks: High-Security and Critical Infrastructure
A 1500 lb electromagnetic lock is specified where the threat model includes sustained physical attack, pry tools, or crowd surge on a controlled perimeter. Applications include:
- Government facilities and secured government contractor spaces
- Financial institution vault access corridors
- Critical infrastructure control rooms and utility substations
- High-value evidence or pharmaceutical storage in law enforcement and healthcare
The larger magnet body at this force tier requires more header real estate, so frame dimensions and door frame reinforcement need to be confirmed early in the design process. Power supply capacity and wire gauge for the longer current draw must be calculated before the schedule is finalized.
Four Factors That Determine the Right Force Rating
1. Door Size and Weight
Wider and heavier doors create more lever-arm force at the lock. A 4-foot-wide door gives an intruder twice the mechanical advantage of a 2-foot door when pushing at the opposite edge. Heavier door ratings generally call for higher magnet force to compensate.
2. Interior vs. Exterior Exposure
Exterior openings face wind load, temperature swings, and greater intrusion risk. Sealed weather-proof maglock variants exist for outdoor use. Even if the force rating matches an interior unit, the housing must be rated for the exposure environment.
3. Traffic Volume and Use Pattern
A 600 lb lock on a door that sees constant high-volume traffic -- a busy hospital corridor or school main entry -- may experience more wear on the armature hardware and frame over time. Higher-force units with larger armature plates distribute load differently; the spec should reflect operational reality, not just the security requirement.
4. Mounting Configuration and Frame Depth
Larger magnets need more header space. Before specifying a 1200 or 1500 lb unit, confirm the frame profile will accommodate the magnet body dimensions and that the armature plate can float freely on the door face -- an armature plate screwed rigid to the door will not align correctly and will degrade holding force regardless of the rating on the box.
Fail-Safe Is Not Optional -- It Is What a Maglock Is
Every electromagnetic lock is inherently fail-safe: it is locked only while powered and releases the instant power is cut. This is not a configuration choice. It means every maglock installation requires a compliant request-to-exit device and a fire alarm release circuit that drops power to the lock when the alarm activates. Specifying the force rating without coordinating the release path is an incomplete spec.
On fire-rated openings, confirm that the maglock model carries the appropriate UL listing -- some 1200 lb units carry both UL 294 and UL 10C fire-door listings; others do not. The listing must match the labeled door assembly.
Spec Guidance for Common Settings
- K-12 schools: 600 lb interior corridor entries; 1200 lb exterior perimeter access and main vestibule control
- Healthcare: 1200 lb for controlled egress in behavioral health (verify IBC special locking compliance with AHJ); 600 lb for interior office and records access
- Retail: 600 lb stockroom and employee-only doors; 1200 lb receiving dock and cash room entries
- Industrial / manufacturing: 1200 lb for perimeter and secure equipment areas; 1500 lb where the threat profile warrants
Shop Magnetic Locks at DoorwaysPlus.com
DoorwaysPlus.com carries electromagnetic locks across the 600, 1200, and 1500 pound force tiers, including single, double, and weather-proof configurations. If you need help matching a maglock to a specific opening schedule -- or you need to confirm power supply sizing and release circuit compatibility -- our team can help you get the spec right before the order ships.
Browse our magnetic lock selection or contact us directly at DoorwaysPlus.com to get product recommendations and quantity pricing.