Product Description
Von Duprin 6121 Electric Strike — Satin Brass
The Von Duprin 6121 is an open-back electric strike for double door applications without a mullion. Retrofits Folger Adam 310-4-100 strikes. The 9-1/8" faceplate and open-back design accommodate pair-door configurations where there's no center post. Heavy-duty stainless steel with 3/4" throw. Factory configured as fail secure with 24VDC operation. Compatible with standard rim exit devices from Von Duprin, Falcon, Precision, Sargent. Fire rated UL 10C. The only 6100 series model specifically for mullion-less pairs.
⚡ 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. Required on most fire-rated egress doors for life safety. This is the default for fire exits and emergency egress paths.
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 Safe strike — it unlocks on power loss for life safety egress. That's what you want on most fire-rated doors and emergency exits. If you need it to stay locked during a power outage, order the FS (Fail Secure) version instead. When cutting the frame, double-check the strike pocket depth against the template before routing. The 61xx series needs a clean pocket — any debris behind the strike body will cause binding on the latchbolt.
| Brand | Von Duprin (Allegion) |
| Part Number | 6121-24VDC-US4 |
| Series | Von Duprin 6121 |
| Application | Rim Exit Devices (Hollow Metal Frames) |
| Finish | Satin Brass (606/US4) |
| Mode | Fail Safe |
| Voltage | 24VDC |
| Faceplate | 4-7/8" |
| Latch Throw | 3/4" |
| 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 3/4" latchbolt throw
- Fail Safe operation — unlocks on power loss for life safety egress
- In stock at Lock Depot — same-day shipping on orders before 3 PM EST
Compatible With: Von Duprin 22, 33A, 35A, 88, 98/99 rim devices on hollow metal frames. Pair with a Von Duprin PS914 or PS904 power supply for a complete installation.
Authorized Von Duprin Distributor — Lock Depot is an authorized Von Duprin dealer. Every product ships brand new in original manufacturer packaging with full factory warranty. Contact us or call (877) 365-5625 for expert assistance.
Image shown is representative of the product line. Actual finish, trim, and configuration may vary by SKU.
