Name: SDC Uniflex Series 55-E Heavy Duty 3/4" Mortise Electric Strike with Field Reversible Fail-Safe/Fail-Secure Operation
Brand: SDC
SKU: 55-EQxLBM/LCM/DBM-R
Price: 796.78 USD
Availability: InStock

Product Overview
FAQs

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

Professional Access Control Solution for Hollow Metal Frame Applications

The SDC Uniflex Series 55-E electric strike delivers heavy-duty access control performance for cylindrical locksets, mortise locksets with or without deadbolts, and mortise exit devices. Engineered with a 3/4"; latchbolt capacity and up to 1"; deadbolt throw accommodation, this strike features field reversible fail-safe/fail-secure operation with dual voltage capability of 12/24 VDC. The heavy cast housing body with stainless steel components provides exceptional durability rated for 1,000,000 endurance cycles with 2500 holding force and 70 ft-lbs dynamic strength.

Professional Features & Benefits

Heavy-Duty Latchbolt Capacity: Accepts 3/4"; throw latchbolts and up to 1"; throw deadbolts for versatile lockset compatibility.
Exceptional Durability: Tested to 1,000,000 endurance cycles with 2500 holding force and 70 ft-lbs dynamic strength for demanding commercial applications.
Flexible Power Configuration: Field selectable dual voltage operation at 12/24 VDC with field reversible fail-safe/fail-secure modes for various system requirements.
Heavy Cast Construction: Heavy cast housing body and keeper with stainless steel components provide corrosion and tamper resistance.
Retrofit Compatibility: Designed to retrofit existing ANSI 4-7/8"; strike prep without centerline relocation for easy installation.
Professional Certifications: UL 1034 Burglary-Resistant Electric Locking Mechanisms, UL 10C Positive Pressure Fire Tests, and ANSI/BHMA A156.31 Grade 1 rated.
Advanced Design Features: Non-handed design with horizontal alignment adjustment, interchangeable faceplate system, and internally mounted solenoid with voltage and current spike protection.

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-D
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 heavy cast housing construction and stainless steel components rated for 1,000,000 endurance cycles with 2500 holding force. UL 1034, UL 10C, 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-D
Product Voltage:: 12/24VDC
Switch Device:: SPDT
Product Category:: Electronic Access Controls
Department:: Door Hardware

SDC 55-EQxLBM/LCM/DBM-R – Frequently Asked Questions

1) What locksets will the SDC 55-E electric strike work with?

Cylindrical locksets, mortise locksets with or without a deadbolt, and mortise exit devices. The keeper takes latchbolts up to 3/4 inch throw and deadbolts up to 1 inch throw, which is what lets it handle a mortise lock with the deadbolt thrown rather than just the latch. If your lock only projects 5/8 inch you're still fine, since 3/4 inch is the ceiling not the requirement.

2) Do I have to order the SDC 55-E strike fail-safe or fail-secure, and do I need to pick a voltage?

Neither is locked in at the factory. The 55-E is field reversible between fail-safe and fail-secure, and voltage is field selectable at 12 or 24 VDC, so one part covers both a stairwell door that has to release on a fire alarm and an entry that has to stay locked when power drops. What you do have to specify on the order is handing (left or right), the finish, and whether you want a monitoring option.

3) Can I get latch and deadbolt monitoring on the SDC Uniflex 55-E strike?

Four monitoring configurations are offered on the 55-E: LBM for latch status, DBM for deadbolt status, LBMLCM for latch and keeper deadlocked status, and LBMLCM DBM for latch, keeper deadlocked and deadbolt status together. You can also order it with no monitoring at all. The switches are SPDT, so each one gives your access control panel a normally open and a normally closed contact off the same monitor point. If the head end needs door position and deadbolt state reported separately, the combined LBMLCM DBM option is the one to specify.

4) Is the SDC 55-E strike handed, and how do I tell which hand to order?

Handing matters on the order. The 55-E comes left hand or right hand, so determine the door's hand before ordering. The strike body itself is described as a non-handed design with the handing set by the configuration you order, and the faceplate system is interchangeable. Standing outside the opening, if the hinges are on your left it's a left hand door.

5) Is the SDC Uniflex 55-E strike fire rated and Grade 1?

It carries ANSI/BHMA A156.31 Grade 1, UL 10C for positive pressure fire tests, and UL 1034 for burglary-resistant electric locking mechanisms. Grade 1 is the commercial-duty tier, which is what a hospital, school or government spec usually calls for. Note that a fire door normally requires the fail-secure setting, since the latch has to stay engaged during a fire, and the 55-E is field reversible so you can set it that way.

6) Can I use the SDC 55-E electric strike on an exterior gate or an aluminum storefront door?

No. The Uniflex 55-E is a hollow metal frame product for interior commercial openings. For an outdoor gate, the Camden CX-ED1959 series is outdoor rated. For an aluminum storefront jamb, use an Adams Rite 7100, 7160 or 7170 instead; the 7170 covers hollow metal and wood jambs. Putting a frame-specific strike in the wrong jamb type means recutting the frame, so match the jamb first.

7) The 55-E is for a hollow metal frame - what electric strike should I use on an aluminum jamb instead?

The SDC Uniflex 55-E is built for hollow metal frames and retrofits ANSI 4-7/8 inch strike prep. Aluminum jambs are a different cavity and need a strike made for them: the Adams Rite 7100 Series electric strike is made for aluminum jambs with a flat 1-1/4 by 4-7/8 inch faceplate, and the Adams Rite 7160 is also an aluminum jamb strike with a 1-1/4 by 4-7/8 inch faceplate. Note that both the 7100 and 7160 are non fire rated, so on a labeled aluminum opening neither is the answer. Adams Rite also builds the 7170 for hollow metal and wood jambs with the same 1-1/4 by 4-7/8 inch faceplate if the frame material varies across the job.

8) I need field reversible fail-safe and fail-secure like the SDC 55-E but the door is a rim exit device - what works?

The SDC Uniflex 55-E is field reversible between fail-safe and fail-secure and suits cylindrical locksets, mortise locksets with or without deadbolts, and mortise exit devices. For a rim exit device the Hager 2945 is the direct alternative: it is a fire rated rim exit strike with field selectable fail-safe/fail-secure and a built-in latchbolt monitor. If the opening uses surface vertical rods rather than a rim device, the HES Folger Adam 310-4-2 is a complete Grade 1 electric strike pac built for surface vertical rods. Match the strike to the exit device type first, then confirm the mode and monitoring the panel expects.

9) What is the closest alternative to the SDC 55-E for a cylindrical lockset on a fire rated opening?

The SDC Uniflex 55-E carries UL 10C positive pressure fire test listing along with UL 1034 and ANSI/BHMA A156.31 Grade 1, and it handles cylindrical locksets as well as mortise. For a cylindrical lock on a labeled opening, the Von Duprin 4211 is a heavy duty Grade 1 fire rated electric strike for cylindrical locks with 12/24 VDC field-selectable voltage, which matches the 55-E on dual voltage. The Hager 2930 is a fire rated Grade 1 strike covering both cylindrical and mortise locks at 12/24 VDC dual voltage with field reversible fail-safe/fail-secure operation. The Adams Rite 7240 is a fire rated strike for cylindrical locksets sized to a 5/8 inch latchbolt projection, so confirm the latch throw before specifying it against a 3/4 inch latch.

10) I need latch and deadbolt monitoring on the strike - how does the SDC 55-E compare to other monitored strikes?

The SDC Uniflex 55-E is ordered with the monitoring built in, through device options for DBM deadbolt status, LBM latch status, LBMLCM latch and keeper deadlocked status, or LBMLCM DBM combining latch, keeper deadlocked and deadbolt status, with an SPDT switch device. Among comparable monitored strikes, the Dortronics 3300 Series carries a latch bolt sensing switch at 12/24 VDC with a strike plate for ANSI 4-7/8 by 1-1/4 inch prep, the Hager 2945 includes a latchbolt monitor, and the Camden CX-ED1799L-8 is a Grade 1 fire rated dual monitor strike supplied with 8 faceplates. The distinction to check is what gets monitored: several of these report latch position only, while the 55-E can be specified to report deadbolt status and keeper deadlocked status as well.

11) The existing frame prep is cut wrong for a standard strike - what is the alternative to the SDC 55-E?

The SDC Uniflex 55-E is designed to drop into existing ANSI 4-7/8 inch strike prep without relocating the centerline, so it fits a frame already cut to ANSI. Where the frame is not cut to ANSI, the Locknetics NC450 is a no cut electric strike, and Locknetics also offers the MDS100 and MS100, both heavy duty strikes, along with the CS450. On the modular side, the Von Duprin 6400 is a Grade 1 modular electric strike for mortise or cylindrical locks in fail-secure with 3-hour UL 10C fire rating in the fail-secure configuration and a satin stainless steel finish. Measure the existing cavity and centerline before choosing between a no cut unit and a modular body.

12) My access control power supply is AC, not DC - can I still use the SDC 55-E?

The SDC Uniflex 55-E runs on 12/24 VDC, field selectable between the two. If the existing power supply is AC, the Trine 004 electric strike operates on 8-16 VAC in fail-secure with a 6-1/4 by 1-3/8 inch faceplate and up to 5/8 inch throw, and it is fire rated. The Trine 2001 runs 16-24 VAC/DC in fail-secure with a 5-7/8 by 1-1/4 inch faceplate and up to 5/8 inch throw, also fire rated, and its AC/DC range means it works either way if the supply changes later. Both are limited to a 5/8 inch throw, so a lock throwing a 3/4 inch latch needs the DC path and a strike sized for it.

13) Is the SDC 55-E strike heavy duty enough for a high-traffic entrance?

The numbers behind it: 1,000,000 endurance cycles, 2,500 lbs holding force, and 70 ft-lbs dynamic strength, in a heavy cast housing and keeper with stainless steel components. That's the range for a main building entry, a school corridor, or a multi-tenant lobby door that gets cycled all day. It's a commercial-rated product, not a light residential one.

14) What are the alternatives to the SDC 55-E mortise electric strike?

Closest in capability from other brands: the Hager 2930, a fire rated Grade 1 strike for cylindrical and mortise locks with the same 12/24 VDC dual voltage and field reversible fail safe/secure operation, and the Von Duprin 6400, a Grade 1 modular strike for mortise or cylindrical locks rated 3-hour UL 10C in fail-secure. The Securitron MUNL mortise unlatch strike is another Grade 1 fire rated mortise option. If you don't need mortise or deadbolt capacity, the Von Duprin 4211 is a Grade 1 fire rated strike built specifically for cylindrical locks with field-selectable 12/24 VDC. Where the 55-E separates itself is the deadbolt accommodation and the built-in latch, keeper and deadbolt monitoring options.

15) Is a light commercial electric strike a workable substitute for the SDC 55-E on an interior office door?

The SDC Uniflex 55-E is a commercial heavy duty strike tested to 1,000,000 endurance cycles with 2,500 lbs holding force and 70 ft-lbs dynamic strength. Lighter alternatives exist and are built for lower traffic: the Trine 001 Series is a fail-secure light commercial electric strike with a 5-7/8 by 1-1/4 inch faceplate, and the RCI 15BS is an economy electric strike for special offset latch entry with fail-secure operation. Both are non fire rated and fail-secure only, so they cannot be reversed to fail-safe later and cannot go on a labeled door. On a low-cycle interior office opening with no fire label and no need for fail-safe, they cover the function; on a stairwell, main entry, or any labeled opening, stay with a Grade 1 fire rated strike.

16) What is the difference between the SDC 55-E and a universal multi-faceplate electric strike like the Camden CX-ED1410?

Both approaches solve frame variation, but differently. The SDC Uniflex 55-E is non-handed with an interchangeable faceplate system and horizontal alignment adjustment, and retrofits existing ANSI 4-7/8 inch strike prep without relocating the centerline. The Camden CX-ED1410 and CX-ED1420 are universal Grade 1 ANSI fire-rated electric strikes, and Camden also builds the CX-ED1689L-4 fire rated universal low profile strike shipped with 4 faceplates and the CX-ED1799L-8 with 8 faceplates. A universal kit ships the faceplate options in the box so one part number covers several preps; the 55-E covers the prep variation through faceplate selection plus the alignment adjustment on a heavy cast housing rated to 1,000,000 cycles. On a multi-building standardization program, the question is whether you want one stocked strike that adapts, or one strike specified per prep.

17) Are HES 1500 and 1600 electric strike accessories a substitute for the SDC 55-E?

No. The HES 1500 and HES 1600 items are electric strike accessories for those Grade 1 fire rated series, not complete strikes, so they do not replace a strike body. The SDC Uniflex 55-E is a complete mortise electric strike with a heavy cast housing and keeper, an internally mounted solenoid with voltage and current spike protection, and stainless steel components. If you are replacing a working strike body, an accessory part is the wrong line item; if you are replacing the whole unit, compare against complete strikes such as the HES Folger Adam 310-1(X) strike body, which is Grade 1 and fire rated and takes 1/2, 5/8 or 3/4 inch throw latchbolts.

18) I am standardizing electric strikes across a facility in satin stainless - which Grade 1 heavy duty options match the SDC 55-E?

The SDC Uniflex 55-E is offered in nine BHMA finishes including 630 satin stainless steel and 626 dull chrome, in left hand and right hand, which covers most fleet standardization on a single part family. Comparable Grade 1 heavy duty units include the Alarm Controls AES-100 Grade 1 heavy duty electric strike, the Von Duprin 4211 in 32D, and the Von Duprin 6400 in 32D satin stainless steel, a Grade 1 modular strike for mortise or cylindrical locks. Where the 55-E differs across a mixed facility is breadth: it spans nine finishes plus four monitoring options on one heavy cast platform, so the strike stays the same part family whether the opening needs plain switching or full latch and deadbolt status.

19) Will the SDC 55-E electric strike match the finishes on the rest of my doors?

Nine 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 steel. If your building is standardized on the usual commercial satin chrome or satin stainless look, 626 and 630 are the two to match against your existing lever trim.

20) Will a power spike or a brownout damage the SDC 55-E strike solenoid?

The solenoid is internally mounted with voltage and current spike protection built in, which is the part that usually fails first on a strike wired to a long run or a shared power supply. Housing and keeper are heavy cast with stainless steel components for corrosion and tamper resistance, so the exposed side stands up to abuse as well. Run it at either 12 or 24 VDC as your panel requires.

How fast can I get the SDC 55-EQxLBM/LCM/DBM-R 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-EQxLBM/LCM/DBM-R come with a warranty?

Absolutely. The SDC 55-EQxLBM/LCM/DBM-R 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-EQxLBM/LCM/DBM-R?

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

Why buy the SDC 55-EQxLBM/LCM/DBM-R from ZenSupply?

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

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