SDC Uniflex Series 55-C Heavy ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$591.00
$422.41
SDC Uniflex Series 55-C Heavy Duty 3/4" Mortise Electric Strike with Field Reversible Fail-Safe/Fail-Secure Operation

SDC Uniflex Series 55-C Heavy Duty 3/4" Mortise Electric Strike with Field Reversible Fail-Safe/Fail-Secure Operation

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Model: 55-CQ
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$591.00
$422.41
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SDC Uniflex Series 55-C Heavy Duty 3/4"; Mortise Electric Strike with Field Reversible Fail-Safe/Fail-Secure Operation

Professional Access Control Solution for High-Security Applications

The SDC Uniflex Series 55-C electric strike delivers heavy-duty performance for access control of cylindrical locksets, mortise locksets with or without deadbolts, and mortise exit devices. Designed for installation in hollow metal frames, this 3/4"; latchbolt strike accepts up to 1"; throw deadbolts and features field selectable dual voltage operation at 12/24 VDC. Built with stainless steel components and a heavy cast housing body, the 55-C provides corrosion and tamper resistance with UL 1034 and ANSI/BHMA A156.31 Grade 1 certifications.

Professional Features & Benefits

  • Heavy-Duty Durability: Tested to 1,000,000 endurance cycles for long-term reliability in high-traffic commercial applications.
  • Superior Holding Force: 2500 holding force with 70 ft-lbs dynamic strength for maximum security performance.
  • Flexible Power Options: Field selectable dual voltage operation at 12/24 VDC with voltage and current spike protection for various system requirements.
  • Fail-Safe/Fail-Secure Operation: Field reversible configuration allows adaptation to specific security requirements and emergency egress needs.
  • Premium Construction: Stainless steel components with heavy cast housing body and keeper provide exceptional durability and corrosion resistance.
  • Universal Compatibility: Accepts 3/4"; throw latchbolts and up to 1"; throw deadbolts with interchangeable faceplate design for versatile installation options.
  • Retrofit-Friendly Design: Fits existing ANSI 4-7/8"; strike prep without centerline relocation, ideal for new or retrofit applications.
  • Professional Certifications: UL 1034 Burglary-Resistant Electric Locking Mechanisms, UL 10C fire rating, and ANSI/BHMA A156.31 Grade 1 compliance.

Technical Specifications

  • Commercial/Residential: Commercial
  • Department: Door Hardware
  • Door Type: Hollow Metal
  • Dynamic Strength: 70 ft-lbs
  • Electronic: Yes
  • Endurance Cycles: 1,000,000
  • Holding Force: 2500
  • Latch Throw: 3/4";
  • Product Category: Electronic Access Controls
  • Product Group: Electronic Access Controls
  • Product Model: 55-C
  • Product Subgroup: Electric Strikes
  • Product Type: Electric Strikes
  • Product Voltage: 12/24 VDC
  • Series: 55 Series
  • Subcategory: Electric Strikes
  • Switch Device: SPDT

Professional Applications

  • Commercial Building Security Systems
  • Educational Institution Access Control
  • Healthcare Facility Security
  • Government and Municipal Buildings
  • Industrial Facility Access Points
  • Multi-Tenant Residential Properties
  • Retail Loss Prevention Systems

Why Choose SDC Quality?

SDC electric strike products deliver professional-grade reliability with stainless steel construction and heavy cast housing rated for 1,000,000 endurance cycles. UL 1034 and ANSI/BHMA A156.31 Grade 1 certifications ensure compliance with the highest industry standards. Engineered for demanding commercial applications where dependable access control performance is essential.

Manufacturer Resources

SDC Full Catalog

Product Specs

Subcategory:
Electric Strikes
Series:
55 Series
Dynamic Strength:
70 ft-lbs
Endurance Cycles:
1,000,000
Product Group:
Electronic Access Controls
Product Subgroup:
Electric Strikes
Product Type:
Electric Strikes
Latch Throw:
3/4"
Commercial/Residential:
Commercial
Electronic:
Yes
Door Type:
Hollow Metal
Holding Force:
2,500 lbs
Product Model:
55-C
Product Voltage:
12/24VDC
Switch Device:
SPDT
Product Category:
Electronic Access Controls
Department:
Door Hardware

SDC 55-CQ – Frequently Asked Questions

1) Will the SDC 55-C electric strike drop into an existing ANSI 4-7/8 inch strike prep?
Yes. The Uniflex 55-C mounts in the standard ANSI 4-7/8 inch strike prep without relocating the centerline, so it goes into an existing hollow metal frame cutout for new work or retrofit. The faceplate is interchangeable, which gives you some latitude on matching the existing frame opening.
2) What locks does the SDC 55-C work with, and will it handle a deadbolt?
The 55-C is built for cylindrical locksets, mortise locksets with or without deadbolts, and mortise exit devices. It takes latchbolts up to 3/4 inch throw and deadbolts up to 1 inch throw. If your lock is a rim exit device with a surface latch, this is not the strike for it.
3) Can the SDC 55-C strike be set up fail-safe for a door that has to unlock on a fire alarm?
Yes, and you can do it in the field. The 55-C is field reversible between fail-safe and fail-secure, so the same unit covers an egress or alarm-release opening (fail-safe, unlocks on power loss) or a secured opening that stays locked when power drops. Set it before you hang it rather than pulling the strike back out of the frame.
4) What is the difference between the LBM and LBMLCM options on the SDC 55-C?
Those are the monitoring choices. LBM gives you latch status only, telling the panel whether the latchbolt is seated. LBMLCM adds keeper monitoring, so you get both latch status and confirmation that the keeper is deadlocked. Order None if your system does not need a status input back. All three are available in every finish offered.
5) Is the SDC 55-C Grade 1 and fire rated?
The 55-C carries ANSI/BHMA A156.31 Grade 1, UL 1034 for burglary-resistant electric locking mechanisms, and a UL 10C fire rating. That covers the usual specification language on a commercial or institutional door schedule.
6) I need an electric strike for an aluminum storefront jamb, not hollow metal. What should I use instead of the SDC 55-C?
The SDC 55-C is specified for hollow metal frames, so for an aluminum jamb look at the Adams Rite 7100 Series, which is built for aluminum jambs with a flat 1-1/4 inch x 4-7/8 inch faceplate, or the Adams Rite 7160, also for aluminum jambs with a 1-1/4 inch x 4-7/8 inch faceplate. Both are non fire rated. If the job mixes hollow metal and wood jambs, the Adams Rite 7170 covers those.
7) What is the closest equivalent to the SDC 55-C electric strike from another brand?
The SDC 55-C is a Grade 1, heavy duty electric strike with field reversible fail-safe/fail-secure operation at 12/24 VDC. The closest cross-brand match is the Hager 2930, a fire rated Grade 1 electric strike for cylindrical and mortise locks with 12/24 VDC dual voltage and field reversible fail safe/secure operation. The Von Duprin 4211 32D is another Grade 1, heavy duty, fire rated strike with 12/24 VDC field-selectable voltage, though it is specified for cylindrical locks.
8) My lockset has a 5/8 inch latchbolt. Is the SDC 55-C still the right strike?
The SDC 55-C is built around a 3/4 inch latch throw. For a 5/8 inch latchbolt, the Hager 2925 is an electric strike with a 5/8 inch latch and field reversible fail safe/secure operation, and the Adams Rite 7240 is a fire-rated strike for cylindrical locksets with 5/8 inch latchbolt projection. The HES Folger Adam 310-1(X) strike body covers 1/2, 5/8 or 3/4 inch throw latchbolts if you want one body that spans the range.
9) I need latch monitoring on the strike. How do the SDC 55-C options compare to other monitored strikes?
The SDC 55-C can be ordered with LBM for latch status or LBMLCM for latch and keeper deadlocked status, using an SPDT switch. Comparable monitored strikes include the Dortronics 3300 Series, which has a latch bolt sensing switch and a 12/24VDC coil with a strike plate for ANSI 4-7/8 in x 1-1/4 in prep, the Hager 2945 fire rated rim exit strike with field selectable fail safe/fail secure and latchbolt monitor, and the Camden CX-ED1799L-8 dual monitor Grade 1 strike.
10) The SDC 55-C is a mortise strike. What looks similar but will not work on a mortise lockset?
Several strikes in the same size class serve different latch types. The Adams Rite 7240 is built for cylindrical locksets, and the Von Duprin 4211 32D is a Grade 1 strike specified for cylindrical locks. The HES Folger Adam 310-4-2 is a complete strike pac for surface vertical rod exit devices, and the Camden CX-ED1959 Series is an outdoor rated gate strike. The Von Duprin 6210 is for mortise locks but is 24 VDC fail-secure only, so it is not a drop-in for a field reversible 12/24 VDC requirement.
11) My access control system runs on AC, not DC. What strike should I use in place of the SDC 55-C?
The SDC 55-C runs on field selectable 12/24 VDC. For an AC supply, the Trine 004 strike operates on 8-16VAC, is fail secure and fire rated, with a 6-1/4 inch x 1-3/8 inch faceplate and up to 5/8 inch throw. The Trine 2001 runs on 16-24VAC/DC, fail secure and fire rated, with a 5-7/8 inch x 1-1/4 inch faceplate and up to 5/8 inch throw.
12) Does the SDC 55-C run on 12 or 24 volts?
Both. Voltage is field selectable at 12 or 24 VDC on the strike itself, so one part number works off whatever your access control power supply is putting out. It also has voltage and current spike protection built in.
13) Is the SDC 55-C strong enough for a high traffic entry in a school or hospital?
It is built for that duty. Holding force is 2,500 lbs with 70 ft-lbs of dynamic strength, and it is tested to 1,000,000 endurance cycles, with stainless steel components and a heavy cast housing and keeper for corrosion and tamper resistance.
14) What else could I use instead of the SDC 55-C for a mortise lock with a 3/4 inch latch?
Closest alternatives we carry include the HES Folger Adam 310-1(X) strike body, which handles 1/2, 5/8 or 3/4 inch throw latchbolts and is Grade 1 and fire rated, and the Securitron MUNL Mortise UnLatch, also Grade 1 and fire rated. The Von Duprin 6400 is a Grade 1 modular strike for mortise or cylindrical locks but is fail-secure only, so it will not cover an opening that has to release on power loss the way the field-reversible 55-C does.
15) What is a lighter duty or simpler alternative to the SDC 55-C for a low traffic interior door?
The SDC 55-C is a commercial heavy duty strike rated to 1,000,000 endurance cycles with 2,500 lbs holding force. Where that level is more than the opening needs, the Trine 001 Series is a light commercial, fail-secure strike with a 5-7/8 inch x 1-1/4 inch faceplate, and the RCI 15BS is an economy fail-secure strike for special offset latch entry. Both are fixed fail-secure rather than field reversible, and neither is fire rated.
16) Is there an alternative to the SDC 55-C that avoids cutting the frame?
The SDC 55-C drops into existing ANSI 4-7/8 inch strike prep without relocating the centerline. If the frame has no ANSI prep at all, the Locknetics NC450 is a no cut electric strike. The Camden CX-ED1689L-4 is a fire rated low profile universal strike shipped with four faceplates, and the Camden CX-ED1799L-8 is a Grade 1 dual monitor strike with eight faceplates, both of which give you faceplate choices to match what is already in the jamb.
17) We standardize on Grade 1 strikes across our facilities. Which alternatives to the SDC 55-C carry a Grade 1 rating?
The SDC 55-C is certified to ANSI/BHMA A156.31 Grade 1 along with UL 1034 and UL 10C. Other Grade 1 strikes for a standardization list include the Alarm Controls AES-100 heavy duty Grade 1 strike, the Securitron MUNL Mortise UnLatch strike, which is Grade 1 and fire rated, the Von Duprin 6400 32D modular Grade 1 fail-secure strike for mortise or cylindrical locks with a 3-hour UL 10C rating, and the Camden CX-ED1410/CX-ED1420 universal Grade 1 ANSI fire-rated strikes.
18) Can the SDC 55-C be used on a pair of doors, and what else handles that?
The SDC 55-C is a mortise strike accepting 3/4 inch throw latchbolts and up to 1 inch throw deadbolts in hollow metal frames. Where the application is specifically a double door, the Rockwood electric strike for double doors uses a 3/4 keeper and is a Grade 1, fire rated 310-1 Series unit, matching the 3/4 inch latch capacity you get from the 55-C.
19) What kind of monitoring contact does the SDC 55-C use, and what does it wire into?
The monitor is an SPDT switch, so you get a common, normally open and normally closed leg. That lets it drive either a normally open or normally closed input on an access panel or alarm point without an interposing relay. Choose LBM for latch status alone or LBMLCM to monitor the keeper as well.
20) What finishes does the SDC 55-C faceplate come in for matching existing door hardware?
Eight finishes are offered: 605 bright brass, 606 dull brass, 611 bright bronze, 612 dull bronze, 613 oil rubbed bronze, 625 bright chrome, 626 dull chrome, 629 bright stainless and 630 satin stainless. 630 is the usual match for commercial openings already running satin stainless lever trim.
21) What are the heavy duty Locknetics alternatives to the SDC 55-C?
The SDC 55-C is a commercial heavy duty strike with 70 ft-lbs dynamic strength and 2,500 lbs holding force. On the Locknetics side, the MDS100 US32D and the MS100 US32D are both heavy duty electric strikes, and the CS450-32D is a further option in the CS Series. All three are offered in the US32D satin stainless appearance, which lines up with the 630 satin stainless steel finish available on the 55-C.
How fast can I get the SDC 55-CQ delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the SDC 55-CQ come with a warranty?
Absolutely. The SDC 55-CQ is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the SDC 55-CQ?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
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