Quick Summary

A Von Duprin 6211 electric strike enquiry almost always starts the same way. Somebody has a strike in a frame, a number stamped on it that reads 6211, and a part that has stopped doing its job. Then it turns out there are three units sharing that number, and they are not interchangeable.

This guide sets out what the 6211 actually is, how the three variants differ, which parts are supplied separately, and what to establish before ordering anything.

What Is the Von Duprin 6211 Electric Strike?

The 6211 is a heavy duty electric strike from the 6200 Series, designed for single door openings. It gives remote release of a locked door: the lock stays locked, and the strike lets the latch out of the frame when it is signalled.

That distinction matters more than it sounds. An electric strike does not unlock the lock. The lever or knob on the secure side behaves exactly as it did before, and the key still works as it did. What changes is the frame side of the opening, which can now be released from a button, a reader or an access control panel.

What locks does a 6211 accept?

Mortise locks without deadbolts, and cylindrical locksets, provided the latchbolt throw is 3/4 inch. That throw figure is the one to check first, because a latch that projects further will not sit correctly in the keeper and a shorter one may not be held at all.

If you are not certain which family of lock is on the door, our mortise locks versus cylindrical locks guide walks through the visible differences at the door edge.

What Is the Difference Between 6211, 6211AL and 6211WF?

The suffix carries the frame the strike was built for, and with it the depth of the hole the frame needs.

The base 6211 and the 6211AL are both listed for aluminium frames with a 1-11/16 inch backbox depth. The 6211WF is the wood frame unit, and its backbox depth is 4-1/2 inches. That is not a small difference. A WF will not go into a prep cut for an AL, and an AL dropped into a WF cutout will sit in a hole far deeper than it needs.

Do the three share any parts?

Some, and that is where part numbers earn their keep. A single stocked spring kit covers both the 6211 and the 6216, for example, while faceplates are listed per variant. Shared mechanical parts are the reason a strike that has lost its spring tension does not need a new body.

Is the 6211 Fail Safe or Fail Secure?

Fail secure as standard, with fail safe available as an option. In plain terms, remove the power from a fail secure strike and the door stays locked from outside. Remove it from a fail safe strike and the strike releases.

Neither setting affects getting out. Egress happens through the lock on the inside of the door, which is mechanical, so somebody inside can always leave whatever the strike is doing.

How do you set the mode on a 6211WF?

With a slider. Von Duprin lists a fail safe slider as a separate stocked part for the 6211WF, which means the mode is set by a physical component rather than by a different model number.

Two consequences follow. A strike ordered in one mode can be moved to the other without replacing the unit, and a strike behaving unexpectedly on site may simply have been set the other way at some point in its life. Check the slider before condemning the strike.

What Voltage Does a 6211 Need?

The standard listing is 24 VDC, with 12 VDC and 16 VDC available as options. The figure on the strike has to match what the power supply actually delivers at the door, not what it says on the label in the cupboard.

Voltage drop over a long run is the usual culprit when a strike buzzes but does not release. A unit that works on the bench and fails in the frame is rarely faulty. Our electric strike schematic guide covers how the supply, the release device and the strike sit together on a circuit.

Does a fail safe strike draw more current?

In its normal state, yes, because it is held locked by power. A fail secure strike sits idle until somebody releases it. On a site with a battery backed supply, that difference decides how long the supply carries the opening in an outage, so it belongs in the calculation rather than being discovered later.

Which Faceplate Does a 6211 Need?

The listed faceplate for the 6211 family is 4-7/8 inches by 1-1/4 inches. Faceplates are supplied as separate parts, which is useful in two situations: a faceplate damaged by a strike plate removal, and a change of finish on an opening being refurbished.

Faceplates are not universal across the electric strike ranges. A faceplate listed for the 5100 is a 5100 part, not a 6200 part, and the same is true of the 6100. Our Von Duprin electric strike parts guide sets out which part families sit under which series.

What Parts Fail on a 6211 Electric Strike?

The electronics are the part people suspect first and the part that fails last.

A strike lives in a frame, takes the impact of a closing door several hundred times a day on a busy opening, and holds a latch under load whenever somebody leans on the door. The parts that give up reflect that: springs lose tension, keeper surfaces wear, faceplates get bent by levering, and fixings work loose in the frame.

How do you diagnose a 6211 that will not release?

Work from the supply outwards, and measure rather than assume.

Prove the release device is sending a signal. Then measure the voltage at the strike terminals while the release is operated, not at the panel. Then take the load off the strike by pulling the door open slightly and operating the release again, because a latch under side load can hold a keeper that is actually working.

Only when all three have been checked does the strike itself become the suspect. That sequence saves a great many strikes that were never faulty. The same logic applies across the range, and our complete electric strikes guide covers it in more depth.

What Goes Wrong at Installation?

Three things, repeatedly.

The first is backbox depth. The 4-1/2 inch depth of a WF against the 1-11/16 inch depth of an AL is the single most common reason a replacement strike will not go in. Measure the existing cavity before ordering.

The second is latch alignment. The strike is cut into the frame in a fixed position, so the door has to present its latch at the right height. A door that has dropped on its hinges will push its latch against the edge of the keeper.

The third is the mode assumption. A strike fitted fail secure on a door the building expects to release in an alarm is a specification error that will not show up until the day it matters. Our electric strike installation guide covers the sequence in full.

Does the 6211 suit every single door opening?

No. It is listed for mortise locks without deadbolts and for cylindrical locks with a 3/4 inch throw, on a 1-3/4 inch door. A mortise lock with a deadbolt, a different throw, or a pair of doors without a mullion all take the opening outside what this unit was designed for.

Where the opening falls outside those limits, another series usually covers it. Our 6100 Series parts guide and 5100 Series parts guide set out where each one applies.

What Do You Need to Confirm Before Ordering 6211 Parts?

Six things, and five of them are read off the door rather than looked up.

What if the number on the strike is unreadable?

Measure instead. The faceplate dimensions, the cavity depth and the frame material between them narrow the field quickly, and the latch throw on the door confirms whether the opening belongs to this family at all. A photograph of the faceplate and a tape measure reading of the cavity are usually enough for us to confirm the part.

For a broader view of which components exist across the electric strike ranges, our electric strike parts guide lists them by function rather than by model.

About the Author

Security Parts has supplied repair parts for commercial door hardware since 2001, covering Von Duprin, LCN, Schlage, Falcon, Detex and Adams Rite at the component level. Our diagram based lookup exists so a technician can confirm a part before ordering it. This guide was written by the Security Parts team from supplier documentation and the questions our customers bring us.