For facility managers and security professionals, an inoperable doorway is more than an inconvenience—it is an immediate risk to both perimeter security and operational continuity. While many approach access control with a reactive mindset, extending the lifespan of your electromechanical hardware requires structured, proactive maintenance.
Maximizing Access Control Longevity: The Complete Guide to Electric Strike Preventative Maintenance
Published: Jul 20, 2026
Introduction & The Core Mechanics: How an Electric Strike Works
An electric strike replaces a standard physical keeper with an electromechanical locking mechanism. Understanding how does an electric strike work is essential to diagnosing failures.
When energized (or de-energized in a fail-safe configuration), an internal electromagnetic solenoid pulls a locking plunger back. This movement allows the spring-loaded, pivoting keeper of the strike to swing open, letting the door latch slip past without physical key turn.
Electrical Diagnostics: Verifying System Power Safety
Before physical servicing or performing an electronic lock repair, isolating the power supply is critical. This prevents electrical shorts that can destroy low-voltage circuit boards. For complex frame retrofits, technicians must establish clear safety isolation protocols (how to stop electric service safely to the frame) to prevent feedback from backup battery systems.
Once safe, use a digital multimeter at the strike’s terminal block to verify input voltage:
- Ensure AC or DC voltage stays within ±10% of the manufacturer’s specification (typically 12V or 24V).
- Test current draw under load to identify failing solenoid coils before they burn out completely.
Actuator Anatomy: Solenoid Coils vs. Rotary Motors
The heart of an electric strike is its solenoid—a linear electromagnetic actuator. While rotative systems require complex gears, a strike’s solenoid relies on a copper coil winding.
Proper maintenance mirrors industrial principles on how to maintain an electric motor: minimizing excessive heat and thermal fatigue. Running continuous-duty power to an intermittent-duty AC coil will quickly melt the wire insulation, leading to short circuits. You must ensure voltage types match, or use rectifiers when converting AC circuits to run DC strikes.
The Critical Maintenance Matrix: Daily, Monthly, and Annual Checklists
While ANSI/BHMA Grade 1 strikes are third-party certified for 1,000,000 to 1,500,000 operations, and Grade 2 for 500,000, neglect can degrade this lifespan quickly. High-use doors demand a structured schedule of commercial lock maintenance.
Scheduled Maintenance Protocol
- Daily: Visually inspect the keeper pocket. Clear away any grit, dust, or metal shavings that prevent the latch from seating cleanly.
- Monthly: Conduct a manual preload test (pressing against the door during activation) to verify physical door lock alignment.
- Annually: Audit physical wire connections, test terminal voltages, and inspect door hinges for wear or sagging.
The Great Lubrication Debate: Dry PTFE vs. Conductive Graphite
Using incorrect lubricants can cause immediate electromechanical failures.
- The Hazard of Graphite: Although excellent for mechanical cylinders, traditional graphite door lock lubricant is highly conductive. When sprayed into electromechanical housings, loose carbon particles cause micro-shorts across internal solenoid terminals.
- The Wet Lubricant Trap: Wet lubricants like standard WD-40 attract dust, road salt, and dirt, forming a thick paste that gums up internal pivot joints.
- The Solution: Apply dry PTFE (Teflon) or professional silicone sprays. These non-conductive lubricants dry instantly, reducing friction on the keeper pin without attracting contaminants.
Troubleshooting: Eliminating Latch Preload & Solenoid Burnout
Over 70% of service calls for “electric strikes failing to release” are caused by latch preload. This occurs when physical pressure (exceeding 15 to 30 lbs) binds the keeper. Preload is usually caused by door sag, misaligned weatherstripping, or HVAC pressure differentials. Correcting this requires adjusting the door closer or mastering how to adjust strike plate clearances.
Additionally, continuous voltage can cause solenoid temperatures to spike up to 50°F above ambient. Installing inline power controllers (such as the HES Smart Pac III) drops holding voltage by 20% after actuation, lowering operating temperatures by 35% and doubling the solenoid’s life. If a system fails due to continuous thermal stress, addressing and repairing or replacing failed electric strike components immediately prevents complete perimeter failure.
Frequently Asked Questions
Can I spray WD-40 directly into my electric strike?
No. WD-40 leaves a wet film that collects dust and airborne grime, eventually locking up the pivoting keeper. Use a clean, dry PTFE-based spray instead.
Why does my electric strike buzz but refuse to open?
The strike is receiving voltage, but latch preload (lateral door pressure) is pinning the internal keeper shut. Gently pull or push the door to relieve pressure; if it releases, your door is misaligned.
How often should my commercial building’s electric strikes be serviced?
Standard interior doors require service annually. High-traffic exterior entrances (experiencing over 500 daily cycles) should be cleaned, aligned, and inspected quarterly.
Partnering with Sure Lock & Key for Commercial Security
Maintaining high-security electric hardware requires specialized experience and technical precision. Since our founding, Sure Lock & Key has provided residential, commercial, and emergency locksmith services. Armed with fully-equipped mobile service vans, our licensed and trained technicians stand ready to resolve complex preload alignment, diagnostic voltage drops, and system integration challenges 24/7. Reach out to our team to secure your facility’s access control systems today.
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