Product Description
Von Duprin 6221 Electric Strike — Oil Rubbed Bronze
The Von Duprin 6221 is an open-back electric strike for cylindrical locks on 1-3/4" doors. The open-back design provides clearance for deadbolts or extended-throw latchbolts that need room behind the strike. Factory configured as fail secure with 24VDC operation. Fire rated UL 10C. When a standard closed-back strike like the 6211 blocks the bolt throw, the 6221's open back solves it.
⚡ Fail Safe vs. Fail Secure — What's the Difference?
Fail Safe — Strike unlocks when power is lost. The door can be opened freely during a power outage.
Fail Secure — Strike remains locked when power is lost. Key override is always available from outside. Used for server rooms, evidence rooms, or anywhere security must be maintained during a power failure. The mechanical push bar still allows free egress from inside.
Pro-Tip from Our Locksmiths: This is a Fail Secure strike — it stays locked when power is lost, with key override from outside. Free egress from inside is always provided by the exit device itself, not by the strike. If you need the opening to release on power loss instead, order the FS version. This is a 24VDC model — make sure your power supply matches. Von Duprin PS914 or PS904 are the go-to supplies for 24V strike installations.
| Brand | Von Duprin (Allegion) |
| Part Number | 6221-24VDC-US10B |
| Series | Von Duprin 6221 |
| Application | Mortise Locksets (1" Deadbolt) |
| Finish | Oil Rubbed Bronze (613/US10B) |
| Mode | Fail Secure |
| Voltage | 24VDC |
| Faceplate | 4-7/8" |
| Latch Throw | 1" |
| Fire Rating | Fire Rated — 3-Hour UL 10C Listed |
| Grade | ANSI/BHMA Grade 1 |
| Construction | Heavy-duty stainless steel body |
| Warranty | 3-year limited (electronic), Limited lifetime (mechanical) |
- Heavy-duty stainless steel construction — built for high-traffic commercial applications
- 4-7/8" faceplate with 1" latchbolt throw
- Fail Secure operation — remains locked on power loss, key override available
- In stock at Lock Depot — same-day shipping on orders before 3 PM EST
Compatible With: Mortise locksets with 1" deadbolt throw. Pair with a Von Duprin PS914 or PS904 power supply for a complete installation.
Free Expert Support — As an authorized Von Duprin distributor, Lock Depot provides full manufacturer warranty coverage and same day shipping on most orders. Call (877) 365-5625 for personalized help.
Image shown is representative of the product line. Actual finish, trim, and configuration may vary by SKU.