Key takeaways
- Adams Rite says its 4510 deadlatches do not provide the same maximum security level as the MS deadlock.
- Adams Rite describes the 4510 and 4900 deadlatches as interchangeable, without stile modification, with any MS1850S deadlock of the same backset and faceplate shape.
- The 7100 and 7400 strikes accept the bolt of an Adams Rite 4500, 4700 (discontinued) or 4900 deadlatch.
- The 7100 comes in 12, 16 or 24 volt AC and DC; the 7400 is field selectable for 12 or 24 volts DC. For 16 volts DC, the 7400 product page says it requires Adams Rite's adapter, and its installation instructions say an external 8 Ohm resistor or that adapter.
Identify
Which Adams Rite lock or strike do I have?
The MS1850S bolt, which Adams Rite calls "nearly 3" long", is eight-ply laminated stainless steel with an alumina-ceramic core in the center ply, moved by a pivot mechanism. A 360° turn of the key or thumbturn projects or retracts it, and the key can be removed only when the bolt is in a positively locked or unlocked position.
A deadlatch has a spring-loaded latchbolt instead. On the 4510 and 4900, a key, handle or paddle retracts it; on the 4530, a key or handle.
The 4510, 4530 and 4900 also have an auxiliary bolt (on the Heavy Duty Deadlatch, an auxiliary linchpin) that deadlocks the latchbolt so it can't be pushed back. In Adams Rite's words, it prevents "loiding" or case-knife entry: forcing the latch back with a card or thin blade.
Three of the deadlatches list a bolt holdback, marked in the table: while the bolt is held fully retracted, a reverse turn of the key retains the bolt, allowing the door to be free swinging.
Adams Rite also lists the 4920AN Heavy Duty Deadlatch (ANSI Size) for wood and hollow metal door applications; this page does not cover it.
For how storefront door hardware works on any brand, see the general commercial storefront door hardware guide.
| Model | Kind (Adams Rite's name) | Door Adams Rite names | Bolt or latchbolt | Notes |
|---|---|---|---|---|
| MS1850S | MS deadlock | Single leaf narrow stile aluminum door | Straight bolt, 5/8" x 1-3/8" x 2-7/8", 1-3/8" throw | Eight-ply laminated stainless steel bolt; key or thumbturn |
| MS1850S-X5X | MS deadlock | Sliding narrow stile aluminum door | Hookbolt, 5/8" x 1-3/8", 13/16" throw | - |
| 1850S-X2X | Short Throw Deadlock (on the MS1850S catalog page) | - | Short bolt, 13/16" throw | Not available with the 7/8" backset |
| MS1850SN410 | MS deadlock | Hollow metal or wood doors | Straight bolt, 5/8" x 1-3/8" x 2-7/8", 1-3/8" throw | - |
| MS1850SN450 | MS deadlock | Hollow metal or wood sliding doors | Hookbolt, 5/8" x 1-3/8", 13/16" throw | - |
| MS1950P | MS deadlock | Single leaf narrow stile aluminum door (product page); single leaf aluminum door (catalog page) | Straight bolt, 5/8" x 1-3/8" x 2-7/8", 1-3/8" throw | Fully stainless steel case and internal components |
| MS1950P-X5X | MS deadlock | Sliding narrow stile aluminum door (product page); sliding aluminum door (catalog page) | Hookbolt, 5/8" x 1-3/8", 13/16" throw | - |
| 4510 | Standard Duty Deadlatch | - | All metal latchbolt, 1/2" x 1", 1/2" throw | All-metal auxiliary bolt; bolt holdback |
| 4530 | Standard Duty Deadlatch | - | All metal latchbolt, 1/2" x 1", 1/2" throw | All-metal auxiliary bolt; bolt holdback |
| 4900 | Heavy Duty Deadlatch | - | Solid brass latchbolt, 5/8" x 1", 5/8" throw | Stainless steel auxiliary linchpin; bolt holdback |
| 4300 | Steel Hawk 4300 Electrified Deadlatch | - | Stainless steel latchbolt, 5/8" x 1", 5/8" throw | Fail secure configuration only |
| 7100 Series | Electric strike | Aluminum, hollow metal or wood applications | Accepts the bolt of an Adams Rite 4500, 4700 (discontinued) or 4900 deadlatch | - |
| UltraLine 7400 Series | Electric strike | Aluminum, hollow metal or wood applications | Accepts the bolt of an Adams Rite 4500, 4700 (discontinued) or 4900 deadlatch | Non-handed |
Source Adams Rite's product pages and catalog pages for each lock and strike on this page.
Fit
Will it fit my door?
The backset is the distance from the edge of the door to the center of the key cylinder; Adams Rite's drawings label it as measured at the centerline of the stile nose. The faceplate is the metal plate that shows on the edge of the door. Handing is whether a lock is made for a left-hand or a right-hand door.
| Model | Backset | Faceplate | Case | Handing | Door thickness | Fits in place of (Adams Rite's words) |
|---|---|---|---|---|---|---|
| MS1850S | 7/8", 31/32", 1-1/8" and 1-1/2" | 1" x 6-7/8" | 1" x 6" x depth; depth varies by backset | Non-handed with any flat or radius faceplate, except Schoolhouse; handing is selected for a bevel faceplate only | - | - |
| MS1850S-X5X | 7/8", 31/32", 1-1/8" and 1-1/2" | 1" x 6-7/8" | - | Non-handed with any flat or radius faceplate, except Schoolhouse; handing is selected for a bevel faceplate only | - | - |
| 1850S-X2X | Not available with the 7/8" backset | - | - | - | - | - |
| MS1850SN410, MS1850SN450 | 1-1/2" only | 1-1/4" x 8" | 1" x 6" x 2-1/4" | - | - | - |
| MS1950P | 31/32", 1-1/8" or 1-1/2" only | 1" x 6-7/8" | 1" x 6" x depth; depth varies by backset | Non-handed with any flat or radius faceplate, except Schoolhouse; handing is selected for a bevel faceplate only | - | - |
| MS1950P-X5X | 31/32", 1-1/8" or 1-1/2" only | 1" x 6-7/8" | - | Non-handed with any flat or radius faceplate, except Schoolhouse; handing is selected for a bevel faceplate only | - | - |
| 4510 | 7/8", 31/32", 1-1/8" or 1-1/2" | 1" x 6-7/8" | - | Handing reversible | - | Interchangeable, without stile modification, with any MS1850S deadlock of the same backset and faceplate shape |
| 4530 | 7/8", 31/32" or 1-1/8" only | 1-1/4" x 7-13/32" | - | Handing reversible | - | Designed to fit, without alteration, the stile cutout for older MS1850 Series deadlocks and discontinued 4250 deadlatches of the same backset |
| 4900 | 31/32", 1-1/8" or 1-1/2" | 1" x 6-7/8"; flat and radius faceplates both supplied | - | Handing reversible | 1-3/4" minimum | Interchangeable, without stile modification, with any MS1850S of the same backset and faceplate shape; also retrofits to existing 4510 and discontinued 4700 deadlatch preparations |
| 4300 | 31/32", 1-1/8" and 1-1/2" | 1" x 6-7/8"; flat and radius faceplates both supplied | - | Non-handed | 1-3/4" minimum | - |
Source Adams Rite's product pages and catalog pages for each deadlock and deadlatch.
Faceplates and strikes
Which faceplate and strike plate go with it?
The strike is the plate in the frame that the bolt or latch goes into. The MS1850S armored faceplate comes flat, radius (curved), radius with weatherstrip, or bevel (angled), with left-hand and right-hand bevels.
The MS deadlock installation instructions recommend a latch guard with 1850 models for higher security.
| Part | What it is (Adams Rite's description) | Used with |
|---|---|---|
| MS1850S | Flat armored faceplate, 1" x 6-7/8" | MS1850S deadlock |
| MS1851S | Radius armored faceplate | MS1850S deadlock |
| MS1851SW | Radius armored faceplate with weatherstrip | MS1850S deadlock |
| MS1852S-X15, MS1852S-X16 | Bevel armored faceplate: X15 for left hand, X16 for right hand | MS1850S deadlock |
| 4510, 4511, 4511W, 4512 | The same four shapes, drawn on the 4510 catalog page | 4510 deadlatch |
| 4900 faceplates | Ships with both flat and radius faceplates | 4900 deadlatch |
| Slot in the jamb (the side of the frame) | "The strike can be simply a slot cut in the metal jamb" | MS deadlocks |
| 4000 Trim Strike | Optional strike, available separately | MS deadlocks |
| 4001 Box Strike | Optional strike with a dust box, available separately | MS deadlocks |
| MS4002 Armored Strike | Optional strike, available separately; backed by a steel doubler designed to prevent "jamb peeling" | MS deadlocks |
| 4003 ANSI Strike | Designed for use with the MS1850SN | MS1850SN |
| 4901 | Long face designed to span the strike area of the MS deadlocks with which the deadlatch is interchangeable | 4300, 4500, 4700 and 4900 Series Deadlatches |
| 4901-01 | Furnished as standard with the 4530 | 4530 deadlatch |
| 4901 (retrofit) | Specified for retrofit installations of the 4900 | 4900 deadlatch |
| 4902 | Short box strike; furnished as standard with the 4900 | 4300, 4500, 4700 and 4900 Series Deadlatches |
| 4902-01 | Furnished as standard with the 4510 | 4510 deadlatch |
| 4901 and 4902 nylon insert | A snap-in nylon insert is removed to take the 5/8" wide latchbolt of the 4900 in place of the 1/2" wide latchbolt of the 4500/4700 | 4901 and 4902 strikes |
| 4304 | Surface mounted strike, one of the optional strikes for the 4300 | 4300 deadlatch |
Source The MS1850S and 4510 catalog pages, the MS deadlock strike and deadlatch strike catalog pages, the deadlatch product pages and the MS1850S and MS1950 Series installation instructions.
Operation
What operates it: cylinder, thumbturn, lever or paddle?
A mortise cylinder is the round key cylinder that screws into the lock, and its cam is the piece on the back that works the lock. A thumbturn takes the place of a key cylinder on the inside.
The MS1850S and three of the deadlatches, named in the table, accept any standard 1" length, 1-5/32" diameter mortise cylinder with MS cam, or a thumbturn, from either or both sides.
Adams Rite's locks accept standard mortise cylinders of all popular makes, but cams are not generally interchangeable between lock types, and Adams Rite says it is advisable not to attempt using one manufacturer's cylinder with another manufacturer's cam.
For the inside of an MS deadlock, Adams Rite's lever unlocks most MS deadlocks with approximately 3 lbs of downward force on a 3" lever. On a deadlatch, a paddle (a flat handle pushed or pulled) retracts the latchbolt.
| Part | What it is | Works with | Limits Adams Rite lists |
|---|---|---|---|
| 4036 Mortise Cylinder | Standard 1" length, 1-5/32" diameter mortise cylinder with MS cam; available separately | Named on the MS1850S, 4510, 4530 and 4900 pages | The MS deadlock installation instructions say the cylinder, thumbturn and trim rings are not included |
| 4066 Thumbturn | Thumbturn; available separately | Named on the MS1850S, 4510, 4530 and 4900 pages | As for the 4036 |
| 4550 MS Deadlock Lever | Inside lever in place of an existing key cylinder or cylinder type thumbturn; spring loaded to horizontal; relocks with an upward motion | Unlocks most MS deadlocks; hollow stops (the strip on the frame the door closes against, where it is hollow) may preclude use | Not compatible with 7/8" backset locks, the MS+1890 Deadlock/Deadlatch or the 2190 Interconnected Deadlock/Deadlatch |
| 4590 Deadlatch Paddle | Push left, push right, pull left or pull right | Any Adams Rite 4300, 4500 or 4900 Series Deadlatch | - |
| 4591 Deadlatch Paddle | Push left, push right, pull left or pull right | Any Adams Rite 4300, 4500 or 4900 Series Deadlatch | - |
Source The MS1850S and deadlatch product pages, the MS deadlock installation instructions, and the cylinder and thumbturn, MS deadlock lever and deadlatch paddle catalog pages.
Exit doors
Can a deadlock go on an exit door?
Adams Rite's 4089 Exit Indicator, driven by the lock bolt itself, shows LOCKED in red letters or OPEN in green letters on a white background. Its catalog page says: "Under many local building safety codes, this allows the use of a security deadlock with a double cylinder to be installed on a main exterior door provided it's paired with an indicator and proper signage." A double cylinder lock takes a key on both sides.
The indicator includes two adhesive header signs. One reads "THIS DOOR TO REMAIN UNLOCKED DURING BUSINESS HOURS." and the other reads "THIS DOOR TO REMAIN UNLOCKED WHEN THE BUILDING IS OCCUPIED."
On the MS1950P, Adams Rite's operation text says: "An interior thumbturn to lock the bolt and a 4550 lever can also be installed on the interior side to ensure free egress & ADA compliance."
Each of the three MS deadlocks on this page also comes as a special-order "SCHOOLHOUSE" version, modified so that operation from inside is "unlock only". The MS1850S and MS1950P catalog pages say it "is handed and must be specified LH or RH" (left hand or right hand).
Source Adams Rite's 4089 Exit Indicator catalog page, the MS deadlock catalog pages and the MS1950P product page.
Electric strikes
Which electric strike suits the door?
Both series are designed for use with Adams Rite deadlatches or cylindrical locksets (knob or lever locks) with 1/2" to 5/8" latchbolt projection, for use in aluminum, hollow metal or wood applications.
The basic strike in each series has a lip, the part the latch rides over as the door closes, of proper length for a 1-3/4-inch thick door that closes flush with the jamb edge. Lip extension kits, for flat faceplates only, cover other conditions; a door centerline to jamb edge dimension of 1-1/16 inches or less does not require one.
Adams Rite says the 7400 has over 1,500 lbs of holding force in fail secure mode and opens electrically under 25 lbs of preload, which it defines as pressure exerted on doors by air conditioning systems, warping or misaligned hardware.
| 7100 Series model | 7400 Series model | Faceplate size | Faceplate shape | Adams Rite's note |
|---|---|---|---|---|
| 7100 | 7400 | 1-1/4" x 4-7/8" | Flat with radius corners | - |
| 7101 | 7401 | 1-1/4" x 4-7/8" | Radiused to match nose on inactive leaf in a pair of narrow stile doors | Lip extension kits not available |
| 7110 | 7410 | 1-7/16" x 7-15/16" | Flat with radius corners | - |
| 7111 | 7411 | 1-7/16" x 10-1/4" | Flat with radius corners | - |
| 7130 | 7430 | 1-1/4" x 6-7/8" | Flat with radius corners | Large faceplate designed to cover the strike opening when converting from an MS pivoted-bolt deadlock to a deadlatch |
| 7131 | 7431 | 1-1/4" x 6-7/8" | Radiused to match nose on inactive leaf in a pair of narrow stile doors | Large faceplate designed to cover the strike opening when converting from an MS pivoted-bolt deadlock to a deadlatch; lip extension kits not available |
| 7140 | 7440 | 1-1/4" x 4-7/8" | Flat with square corners | 7440: "Installation in wood requires WDC7400" (7400 catalog page) |
Which doors each series names
The 7100 product page names "any door equipped with" those deadlatches or locksets; the 7400 product page names "narrow stile aluminum doors equipped with" them.
The 7400 on a wood door
The product page and catalog page describe the WDC7400 Wood Door Cover as for mounting the 7400 Series on the inactive leaf of a pair of doors; the current installation instructions call it a spacer "designed to simplify mortising on wood door applications (sold separately)".
Source Adams Rite's 7100 and 7400 product pages and catalog pages, and the current 7400 installation instructions.
Power and fail mode
How is the strike powered, and what happens when power is off?
A fail secure strike stays locked when power is off; a fail safe strike is unlocked without power. Both series are listed as field selectable between the two.
The current 7400 installation instructions say the strike is "pre-set for Fail-Secure operation" and describe a conversion to fail-safe, in which the strike "will be UNLOCKED without power". They add: "FAIL SAFE OPERATION mode should not be used in fire rated or windstorm-resistant applications."
Neither series' product page or catalog page states a fire rating. Adams Rite sells a separate 7200 Series under the name Fire-Rated Electric Strikes.
On the 7100, DC continuous units are silent and AC intermittent units "buzz" on operation, and the "AC intermittent solenoid must not be used continuously in either." The solenoid is the electric coil that moves the strike's release. The 7100 data sheet says AC intermittent duty solenoids are designed to be energized 30 seconds at a time, and that fail-safe units use only continuous duty solenoids.
Both series offer two Form C monitoring switches as an option (a Form C switch has one common contact and one contact for each state, so it can report either); the table says what each reports.
The 4300 Electrified Deadlatch is available in fail secure configuration only. Adams Rite says the standard model operates on 12, 16 or 24 VDC power, is rated for continuous duty, has an optional form "C" latch status monitor and is always operable from the inside via handle or paddle device.
| Item | 7100 Series | 7400 Series |
|---|---|---|
| Voltage | Available in 12, 16 or 24 volt AC and DC | Field selectable to match a 12 or 24 VDC power source |
| 16 VDC on the 7400 | - | Product page and catalog: requires the VA7400-16VDC adapter, sold separately. Installation instructions: an external 8 Ohm resistor or that adapter |
| DC current draw | Catalog page: 0.33 A at 12 VDC, 0.22 A at 16 VDC, 0.17 A at 24 VDC | Catalog page and product page: .44 A at 12 VDC, .46 A at 16 VDC with the adapter, .23 A at 24 VDC |
| DC current draw, installation instructions | - | 440 mA at 12 VDC, 440 mA at 16 VDC and 230 mA at 24 VDC, continuous duty |
| AC current draw | Catalog page: 1.42 A at 12 VAC, 0.63 A at 16 VAC, 0.74 A at 24 VAC | - |
| AC intermittent solenoid, data sheet (peak instantaneous and hold current) | 1.420 A and .813 A at 12 VAC; 1.030 A and .636 A at 16 VAC; .744 A and .431 A at 24 VAC | - |
| Fail safe or fail secure | Listed as field selectable at time of installation (installer setting) | Field selectable; the installation instructions say pre-set for fail-secure |
| Monitoring option | Two Form C switches: latchbolt engaged in the strike, and whether the strike jaw is blocked. Not available on 7130/7131, 7140 | Two Form C switches: latchbolt engaged in the strike jaws, and locked/unlocked solenoid status |
| Certifications listed | UL 1034 burglary-resistant listed; UL 294 listed (the product page says UL 294 (6th Edition) listed) | UL 1034 Burglary-Resistant Listed and Suitable for Outdoor Use; UL 294; ULC-S319; ANSI/BHMA A156.18; ANSI/BHMA A156.31, Grade 1 |
| Case | 1" x 3-3/8" x 1-5/8" deep | 1-13/32" x 3-3/8" x 1-1/16" deep |
Source Adams Rite's 7100 and 7400 product pages and catalog pages, the 7100 Series data sheet, the current 7400 installation instructions, the electric strike options page, the 7200 Series product page and the 4300 product page.
Part numbers
What is a 7400A?
7400A is a strike body kit, the working part of the strike without its faceplate: Adams Rite's standard 7400 UltraLine body, for use in single door applications, beside a radius body for applications with pairs of doors.
In this modular packaging, one strike body kit is matched with one faceplate kit, which contains all hardware to mount it, to make a complete electric strike. The 7400 order table lists the A code as "A Modular Pack – Body Kit".
| Kit | What it is | For use with |
|---|---|---|
| 7400A | Standard body kit, for use in single door applications | Faceplate kits FPK7400, FPK7410, FPK7411, FPK7430, FPK7440 and FPK7445 |
| 7401A | Radius body kit, for use in applications with pairs of doors | Faceplate kits FPK7401 and FPK7431 |
| FPK7400, FPK7410, FPK7411, FPK7430, FPK7440, FPK7445 | Faceplate kits; contain all hardware to mount | Body kit 7400A |
| FPK7401, FPK7431 | Faceplate kits; contain all hardware to mount | Body kit 7401A |
Source Adams Rite's electric strike options page and the 7400 catalog page's order table.
FAQ
Adams Rite storefront lock questions
Which Adams Rite electric strike goes with a 4500 or 4900 deadlatch?
Both the 7100 Series and the UltraLine 7400 Series accept the bolt of an Adams Rite 4500, 4700 (discontinued) or 4900 deadlatch.
What is an Adams Rite 7400A?
7400A is the part number Adams Rite gives its standard 7400 strike body kit, for use in single door applications.
Is the Adams Rite 7400 fail safe or fail secure?
Adams Rite's 7400 installation instructions say it is pre-set for fail-secure and describe a conversion to fail-safe, a mode that "should not be used in fire rated or windstorm-resistant applications."
Service
Help with an Adams Rite storefront lock or strike
Elwin Security installs, repairs and replaces Adams Rite deadlocks, deadlatches and electric strikes as part of its commercial locksmith service for commercial and multifamily properties in the San Francisco Bay Area. Calls are answered 8:00 AM-8:00 PM daily at (408) 539-0535.
Sources and further reading
These sources back up the general guidance. Your building and the people who approve the work decide the details for your doors.
- Adams Rite (ASSA ABLOY): MS1850S Series MS, MS1850S-X5X Series MS Deadlocks (product page)
- Adams Rite (ASSA ABLOY): MS1850S, MS1850S-X5X Series MS Deadlocks Catalog Page (updated July 31, 2025)
- Adams Rite (ASSA ABLOY): MS1850SN410, MS1850SN450 Series MS Deadlocks Catalog Page (updated July 31, 2025)
- Adams Rite (ASSA ABLOY): MS1950P, MS1950P-X5X Series MS Deadlocks Catalog Page (updated July 31, 2025)
- Adams Rite (ASSA ABLOY): MS1950P Series MS Deadlocks (product page)
- Adams Rite (ASSA ABLOY): 4510 Standard Duty Deadlatch (product page)
- Adams Rite (ASSA ABLOY): 4530 Standard Duty Deadlatch (product page)
- Adams Rite (ASSA ABLOY): 4900 Heavy Duty Deadlatch (product page)
- Adams Rite (ASSA ABLOY): Steel Hawk 4300 Electrified Deadlatch (product page)
- Adams Rite (ASSA ABLOY): 4510 Standard Duty Deadlatch Catalog Page (updated July 31, 2025)
- Adams Rite (ASSA ABLOY): 4036 Mortise Cylinder, 4066 Thumbturn Catalog Page (updated July 31, 2025)
- Adams Rite (ASSA ABLOY): 4550 MS Deadlock Lever Catalog Page
- Adams Rite (ASSA ABLOY): 4590 Deadlatch Paddle Catalog Page (updated July 31, 2025)
- Adams Rite (ASSA ABLOY): 4591 Deadlatch Paddle Catalog Page
- Adams Rite (ASSA ABLOY): 4089 Exit Indicator Catalog Page (updated July 31, 2025)
- Adams Rite (ASSA ABLOY): 4000 Series MS Deadlock Strikes Catalog Page
- Adams Rite (ASSA ABLOY): 4901, 4902 Deadlatch Strikes Catalog Page (updated July 31, 2025)
- Adams Rite (ASSA ABLOY): 7100 Series Electric Strikes (product page)
- Adams Rite (ASSA ABLOY): 7100 Series Electric Strikes Catalog Page (updated July 31, 2025)
- Adams Rite (ASSA ABLOY): 7100 Series data sheet, wire coding, field reversible (80-0180-381, Rev. H)
- Adams Rite (ASSA ABLOY): UltraLine 7400 Series Electric Strikes (product page)
- Adams Rite (ASSA ABLOY): UltraLine 7400 Series Electric Strikes Catalog Page (updated July 31, 2025)
- Adams Rite (ASSA ABLOY): 7400 Series Electric Strike Installation Instructions (80-0180-309_16, 2025)
- Adams Rite (ASSA ABLOY): Electric Strikes Options & Accessories Catalog Page (updated July 31, 2025)
- Adams Rite (ASSA ABLOY): 7200 Series Fire-Rated Electric Strikes (product page)
- Adams Rite (ASSA ABLOY): MS1850S & MS1950 Series Deadlock Installation Instructions