Security Door Controls 55-C-U Electric Strike for Mortise Locks, 12/24 AC/DC, Fail Safe/Secure, Stainless Steel

Security Door Controls 55-C-U Electric Strike for Mortise Locks (No Deadbolt) is an essential solution for enhancing access control in high-security environments. This electric strike is designed for compatibility with mortise locksets without deadbolts and ensures reliability with its stainless steel construction, offering corrosion and tamper resistance. With a robust static strength of 2,500 lbs and a dynamic strength of 70 lbs, this strike meets rigorous security demands. The 3/4" latchbolt throw and ability to accommodate up to a 1" deadbolt make it versatile across various applications. The field-selectable operation allows for easy adjustments between fail safe and fail secure modes, while the dual voltage capability (12/24 VDC) adds flexibility for installation. The 55-C-U comes with a stainless steel square corner faceplate measuring 4-7/8" x 1-1/4", fitting standard hollow metal frames without the need for centerline relocation during retrofits. Additionally, features such as horizontal alignment adjustment and optional monitoring contacts ensure precise functionality and feedback. Ideal for professionals looking for a reliable electric strike solution, the Security Door Controls 55-C-U is a perfect blend of strength, durability, and ease of use in access control systems.

Electric Strike for Mortise Locks (No Deadbolt), 12/24 AC/DC, FS Fail Safe/FSE Fail Secure, Latchbolt Position Monitor, Faceplate 4-7/8in x 1-1/4in, 630/US32D Stainless Steel

SDC’s 55 series 3/4" latchbolt electric strikes are heavy duty, designed for installation in hollow metal frames for access control of cylindrical locksets, mortise locksets with or without deadbolts and mortise exit devices. 55 series strikes accept 3/4" throw latchbolts and up to 1" throw deadbolts. The choice of six application faceplates eliminates the need for centerline relocation, making them ideal for new or retrofit, high security access control applications. 55 series strikes retrofit existing ANSI 47/8" strike prep – no centerline relocation required.

Features:

• Heavy duty
• Stainless steel components
• Stainless steel square corner faceplate
• Heavy cast housing body and keeper
• Corrosion and tamper resistant
• Horizontal alignment adjustment
• Non-handed
• Interchangeable faceplate design
• Internally mounted solenoid
• Field selectable operation
• Field selectable dual voltage
• Voltage and current spike protection
• Pigtail connectors
• Optional: Latch status (LS)
• Optional: Latch and keeper deadlocked status
• Optional: Deadbolt status

Models:

• 55-A:
• Application: Cylindrical locksets, ANSI centerline latch entry locksets
• Compatible Locks: Cylindrical locksets with 1/2" to 5/8" latchbolts. ANSI centerline latch entry locksets with up to 3/4" latchbolt
• Function No deadbolt: After releasing the latchbolt, keeper returns to the locked position.
• 55-B:
• Application: Mortise locksets without deadbolt. Mortise exit devices with or without deadlatch. Deadlatch located below the latchbolt.
• Compatible Locks: Accurate, Arrow, Best, Corbin Russwin, Dorma, Falcon, Marks, PDQ, Sargent, Yale
• Function No deadbolt: After releasing the latchbolt, keeper returns to the locked position.
• 55-C:
• Application: Mortise locksets without deadbolt. Mortise exit devices with or without deadlatch. Deadlatch located above the latchbolt.
• Compatible Locks: Baldwin, Hager, Schlage, SDC
• Function No deadbolt: After releasing the latchbolt, keeper returns to the locked position.
• 55-D:
• Application: Mortise locksets with deadbolt. Deadlatch located below the latchbolt.
• Compatible Locks: Accurate, Arrow, Best, Corbin Russwin, Dorma, Falcon, Marks, PDQ, Sargent, Yale
• Function:
• Deadbolt Projected: The door will not close.
• Deadbolt Retracted: When signaled by the access control, the keeper unlocks, permitting latchbolt release. The keeper returns to the closed and locked position. The door then returns to the closed and locked position.
• Deadbolt Retainer Installed: Nightlatch/access control lockout function. When the deadbolt is projected the keeper will not release by access control. (nightlatch/access control lockout)
• Deadbolt Retainer Removed: Nightlatch function. When the deadbolt is projected, the keeper unlocks, permitting latchbolt and deadbolt release by the access control. The keeper returns to the closed and locked position. The door will not close and lock when the deadbolt is extended and must be manually retracted to permit door closure.
• 55-E:
• Application: Mortise locksets with deadbolt. No deadlatch
• Compatible Locks: Baldwin
• Function:
• Deadbolt Projected: The door will not close.
• Deadbolt Retracted: When signaled by the access control, the keeper unlocks, permitting latchbolt release. The keeper returns to the closed and locked position. The door then returns to the closed and locked position.
• Deadbolt Retainer Installed: Nightlatch/access control lockout function. When the deadbolt is projected the keeper will not release by access control. (nightlatch/access control lockout)
• Deadbolt Retainer Removed: Nightlatch function. When the deadbolt is projected, the keeper unlocks, permitting latchbolt and deadbolt release by the access control. The keeper returns to the closed and locked position. The door will not close and lock when the deadbolt is extended and must be manually retracted to permit door closure.
• 55-F:
• Application: Mortise locksets with deadbolt. Deadlatch located above the latchbolt.
• Compatible Locks: Hager, Schlage, SDC
• Function:
• Deadbolt Projected: The door will not close.
• Deadbolt Retracted: When signaled by the access control, the keeper unlocks, permitting latchbolt release. The keeper returns to the closed and locked position. The door then returns to the closed and locked position.
• Deadbolt Retainer Installed: Nightlatch/access control lockout function. When the deadbolt is projected the keeper will not release by access control. (nightlatch/access control lockout)
• Deadbolt Retainer Removed: Nightlatch function. When the deadbolt is projected, the keeper unlocks, permitting latchbolt and deadbolt release by the access control. The keeper returns to the closed and locked position. The door will not close and lock when the deadbolt is extended and must be manually retracted to permit door closure.

55 Specifications:

• Latchbolt: 3/4" Throw
• Deadbolt: Up to 1" throw
• Static Strength: 2,500lbs
• Dynamic Strength: 70lbs
• Endurance Cycles: 1,000,000
• Keeper Depth: 1-5/8"
• Weight: 3lbs
• Faceplates:
• A: Cylindrical locksets
• B: Mortise locksets without deadbolt & mortise exit devices - deadlatch below
• C: Mortise locksets without deadbolt & mortise exit devices - deadlatch above
• D: Mortise locksets with deadbolt - deadlatch below
• E: Mortise locksets with deadbolt - no deadlatch
• F: Mortise locksets with deadbolt - deadlatch above
• Frame Application: Hollow metal
• Input: 12/24 VDC ± 10%
• Current Draw: 600 mA @ 12 VDC, 300 mA @ 24 VDC
• Monitoring Contacts: SPDT, 5 Amps @ 30 VDC resistive

Finishes:

• U/630 - Dull stainless
• S/629 - Bright stainless
• D/606 - Dull brass
• C/605 - Bright brass
• G/612 - Dull bronze
• F/611 - Bright bronze
• H/613 - Dark oil rubbed bronze
• Q/626 - Dull chrome
• P/625 - Bright chrome

Resources

• Cut Sheet
• Installation Sheet