Medeco 110A1911 Maxum High-Sec...
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Medeco Maxum Deadbolts, 2-3/8" Backset, 2-1/4" x 1" Faceplate, Deadbolt Only

Medeco 110A1911 Maxum High-Security Deadbolt with 2-3/8" Backset and UL 437 Listed Cylinder

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Model: 110A1911-26
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Medeco 110A1911 Maxum High-Security Deadbolt — UL 437 Listed, BHMA A156.5 Grade 1 Certified

The Medeco Maxum 110A1911 is a heavy-duty, high-security deadbolt engineered to deliver unmatched protection against unauthorized key duplication, bumping, picking, drilling, wrenching, kicking, and other forms of physical attack. Featuring a solid 1" hardened steel bolt housed in a heavy-gauge tubular steel body, this deadbolt is UL 437 Listed and BHMA A156.5 Grade 1 Certified. It accommodates doors 1-3/8" to 2-1/2" thick, uses a standard 2-3/8" backset with a 2-1/4" x 1" faceplate, and is built around the Medeco 4 (M4) cylinder platform for maximum key control and master keying flexibility.

Key Features

  • Solid 1" Hardened Steel Bolt: A full 1" hardened steel bolt in a heavy-gauge tubular steel housing provides maximum resistance to physical attack, including crowbar and kick-in attempts.
  • Door Thickness Compatibility: Fits doors 1-3/8" to 2-1/2" thick with a standard 2-3/8" backset, 2-1/4" x 1" faceplate, and standard 2-1/8" crossbore and 1" edge bore (ANSI A115.13 prep).
  • Medeco 4 (M4) Key Control: Patent-pending Medeco 4 design provides protection against unauthorized key duplication, including deterrence against 3D-printed key copies or blanks, via a patent-pending movable element in the key.
  • Drill and Pick Resistance: Hardened steel inserts and rotating pins provide drill and pick resistance per UL 437 standard; solid-brass construction with strategically placed drill pins adds further protection.
  • Steel Shroud Over Bolt: A steel shroud over the bolt protects against "ice pick" type attacks for added physical security.
  • High-Security Strike Plate: Includes a special box-design strike plate secured with 2" screws that anchor directly to the building structure behind the frame, preventing kick-in attacks.
  • Master Keying Capabilities: M4 deadbolts can be master keyed into systems that include M4, M4 BiLevel, and M4 CLIQ keys and cylinders, supporting extremely large master key systems.
  • Special Angle-Cut Keys: Requires a special key cutting machine and Medeco-specific blanks; angled cuts along with fore-and-aft positioning dramatically increase key combinations for large master key systems.

Certifications & Compliance

  • UL 437 Listed — Protection against picking and drilling attacks
  • BHMA A156.5 Grade 1 Certified Deadbolt
  • BHMA A156.30 Certified Locking Technology — Key control and unauthorized duplication protection
  • ANSI/BHMA A156.36 Grade 1 Listed Cylinders for high security
  • ANSI A115.13 Door Preparation Compatible

Technical Specifications

  • Series: Maxum® Residential Deadbolt
  • Cylinder Technology: Medeco 4 (M4)
  • Pinning: 5 or 6-Pin
  • Keyway: Factory-specified
  • Certification: UL 437 Listed; ANSI/BHMA A156.36 Grade 1 (M4)
  • Bolt: 1" solid hardened-steel bolt in heavy-gauge steel housing
  • Door Thickness: Fits doors 1-3/8" to 2-1/2" thick
  • Door Prep: Standard 2-1/8" crossbore, 1" edge bore (ANSI/BHMA A115.13)
  • Construction: Solid-brass cylinder construction with hardened steel inserts
  • Warranty: 2-year manufacturer's warranty

Typical Applications

  • Residential Entry Doors Requiring High-Security Protection
  • Commercial Office Buildings and Suites
  • Educational Facilities and Campus Buildings
  • Healthcare Institutions and Medical Offices
  • Government and Municipal Buildings
  • Multi-Tenant Residential Properties
  • Retail Establishments and Small Businesses

Why Medeco?

Medeco Maxum deadbolts are built to the highest security standards, combining a solid 1" hardened steel bolt, heavy-gauge tubular steel housing, and the advanced Medeco 4 (M4) cylinder platform to resist drilling, picking, bumping, and physical attack. With UL 437 Listing, BHMA A156.5 Grade 1 Certification, and BHMA A156.30 key control certification, the Maxum delivers professional-grade security for residential and commercial applications where protecting access is paramount.

Manufacturer Resources

Medeco Product Catalog

Product Specs

Product Group:
Mechanical Locks
Series:
Maxum Series
Subcategory:
Deadbolts
Product Subgroup:
Bored Locksets
Product Type:
Deadbolts
Commercial/Residential:
Residential
Keyed:
Yes
Duty Level:
Heavy Duty
Keyed Function:
Single Cylinder
Lock Function:
Deadbolt
Product Model:
110A1911
Product Function:
Cylinder x Thumbturn
Keyway Options:
DL Keyway
Product Category:
Mechanical Locks
Department:
Door Hardware

Medeco 110A1911-26 – Frequently Asked Questions

1) Does the Medeco Maxum deadbolt drop into an existing deadbolt hole, or do I have to re-bore the door?
It uses standard prep, so an existing door usually takes it as-is: 2-1/8 inch crossbore, 1 inch edge bore, 2-3/8 inch backset, and a 2-1/4 x 1 inch faceplate, all to ANSI A115.13. If the door you are pulling the old bolt off of was bored to that standard, the Maxum goes straight in. The one thing that does change is the strike: it ships with a box strike fastened with 2 inch screws that reach past the jamb into the framing, so you will be drilling deeper strike screw holes even on a clean retrofit.
2) My doors are bored for a 2-3/4 inch backset. Can I use the Medeco 110A1911?
No. The 110A1911 is a fixed 2-3/8 inch backset bolt, not an adjustable one, so it will not line up on a door bored at 2-3/4 inches. Backset is the distance from the door edge to the center of the crossbore, and 2-3/8 and 2-3/4 are the two common ones, so it is worth measuring before you order. If the opening is 2-3/4, look at a deadbolt with an adjustable backset such as the Cal-Royal ED500 or the Brinks Raleigh E2401, both of which are built to cover more than one backset.
3) Is a Medeco Maxum worth it over a standard Grade 1 deadbolt, or am I paying for the same thing?
The bolt hardware is comparable to other Grade 1 deadbolts; what you are buying is the cylinder. The Maxum carries BHMA A156.5 Grade 1 like a Delaney LM Series or a Dexter DB1000, but it adds UL 437 listing for pick and drill resistance, ANSI/BHMA A156.36 Grade 1 high-security cylinder listing, and A156.30 certification for key control. In practice that means hardened inserts and rotating pins in the cylinder, and keys that cannot be duplicated at a hardware store. If nobody is trying to copy the key and you only need the physical strength, a straight Grade 1 like the Delaney LM or the Design Hardware D1 Series does the mechanical job. If unauthorized key duplication is the actual risk, the standard bolt does not solve it.
4) Can I key the Medeco Maxum deadbolt into the master key system I already run on my building?
Only if that system is Medeco M4. The Maxum 110A1911 is built on the Medeco 4 platform and master keys into systems using M4, M4 BiLevel, and M4 CLIQ keys and cylinders, and the angled key cuts plus fore-and-aft pin positioning give it enough combinations for very large master key systems. It will not key into a Schlage C system, so if the rest of your doors run Schlage C, deadbolts like the Hager 3115 or 3215 are the ones that match that keyway. Keyway on the Maxum is DL, and the cylinder is available 5 or 6 pin.
5) Does the Medeco 110A1911 deadbolt have a key on both sides?
No, it is a single cylinder: key outside, thumbturn inside. That is the right choice for most openings and the only one that lets someone leave without a key. If you have glass beside or in the door and you want to stop someone reaching through and turning it, you need a double cylinder instead, keyed both sides, like the Callan 210S, the Dexter DB1000 double cylinder, or the Design Hardware D1 Series. Check your local egress code first, since double cylinder is restricted in a lot of jurisdictions.
6) Will the Medeco Maxum bolt hold up to a kick-in?
The resistance comes from two pieces working together. The bolt is a solid 1 inch hardened steel bolt in a heavy-gauge tubular steel housing, and a steel shroud over the bolt blocks ice pick style attacks on the bolt itself. But a 1 inch throw is only as good as what it throws into: the included box-design strike is fastened with 2 inch screws that anchor into the structural framing behind the jamb rather than just the door casing. Skip those long screws in favour of the short ones out of the old kit and you have given away most of the kick-in resistance you paid for.
7) Which deadbolt should I use if the door is prepped for a 2-3/4 inch backset instead of 2-3/8 inch?
The Medeco Maxum 110A1911 uses a standard 2-3/8 inch backset with a 2-1/4 inch x 1 inch faceplate. For a door bored at 2-3/4 inch, the Deltana CL200LA is a Grade 2 single cylinder x thumbturn deadbolt built to a 2-3/4 inch backset, and the CL200LAIC is the same Grade 2 deadbolt prepped for an interchangeable core less cylinder. Where the backset is uncertain or varies across a fleet of doors, the Brinks Raleigh and Mendocino single cylinder deadbolts use a 4-way adjustable backset, and the Cal-Royal ED500 is a Grade 3 single cylinder deadbolt with an adjustable backset for doors 1-3/8 inch to 1-3/4 inch.
8) What is the closest Grade 1 single cylinder deadbolt to the Medeco Maxum 110A1911 if high-security key control is not required?
The Medeco Maxum 110A1911 is a cylinder x thumbturn deadbolt built on the Medeco 4 cylinder platform, UL 437 Listed and BHMA A156.5 Grade 1 certified, with a 1 inch hardened steel bolt and a door thickness range of 1-3/8 inch to 2-1/2 inch. If the opening needs Grade 1 strength but not patented key control, the Accentra D111 is a Grade 1 cylinder x thumbturn deadbolt in the D Series with a 2-3/8 inch backset, covering doors 1-3/8 inch to 1-3/4 inch thick. The Dexter DB1000 single cylinder deadbolt is also Grade 1 cylinder x thumbturn and covers 1-3/8 inch to 1-7/8 inch thick doors. Both carry the same Grade 1 rating and the same cylinder x thumbturn function; neither is built on a UL 437 Listed high-security cylinder, and both stop short of the Maxum's 2-1/2 inch door thickness ceiling.
9) I need a fire rated deadbolt - is the Medeco Maxum 110A1911 the right choice?
The Medeco Maxum 110A1911 is UL 437 Listed for pick and drill resistance and BHMA A156.5 Grade 1 certified, which are security certifications rather than a fire rating. When the opening carries a fire label, the Hager 3215 single cylinder deadbolt with a 1 inch throw is a Grade 2 commercial lock that carries a fire rating and fits doors 1-3/8 inch to 1-3/4 inch, and the Hager 3118 Grade 1 classroom deadbolt with a Schlage C keyway and 6-pin cylinder is fire rated across the same thickness range. The Cal-Royal CRB800 is a Grade 1 heavy duty single cylinder deadbolt with a UL 3-hour fire rated latch. All three use the cylinder x thumbturn function, matching the Maxum's operation.
10) What deadbolt takes the place of the Medeco Maxum when the door needs a key on both sides?
The Medeco Maxum 110A1911 is a single cylinder deadbolt, keyed outside with a thumbturn inside. Where egress policy calls for a key on both faces, the Design Hardware D1 Series is a Grade 1 double cylinder deadbolt rated extra heavy duty for 1-3/4 inch doors, and the Dexter DB1000 double cylinder deadbolt is Grade 1 for doors 1-3/8 inch to 1-7/8 inch thick. The Delaney LU Series double cylinder deadbolt is Grade 2 in a stainless steel US32D finish. Note that double cylinder deadbolts require a key to exit and are restricted by code in many occupancies, so confirm the requirement for the facility type before substituting.
11) Is the Arrow E60 exit deadlock an equivalent to the Medeco Maxum 110A1911?
No. The Medeco Maxum 110A1911 is a keyed single cylinder deadbolt on the Medeco 4 platform, cylinder outside and thumbturn inside. The Arrow E60 is a Grade 2 exit deadlock that is non-keyed, with a blank plate outside and thumbturn inside for doors 1-3/8 inch to 1-3/4 inch thick. It throws a deadbolt but cannot be operated or master keyed from outside, so it suits a door that is secured from the inside only. If a keyed outside function is needed in that family, the Arrow E61 is a single cylinder deadlock with SFIC prep less core for the same 1-3/8 inch to 1-3/4 inch door range, which takes an interchangeable core rather than the Maxum's factory-specified Medeco keyway.
12) I want an interchangeable core deadbolt to standardize with the rest of my facility - what are the options against the Medeco Maxum?
The Medeco Maxum 110A1911 uses a factory-specified Medeco keyway on the Medeco 4 platform with a 5 or 6-pin cylinder, and master keys into M4, M4 BiLevel and M4 CLIQ systems. If the facility standard is small format interchangeable core, the Arrow E61 is a Grade 2 single cylinder deadlock with SFIC prep less core for doors 1-3/8 inch to 1-3/4 inch, and the Deltana CL200LAIC is a Grade 2 cylinder x thumbturn deadbolt prepped for an interchangeable core with a 2-3/4 inch backset. The Delaney LM Series is a Grade 1 single cylinder less core deadbolt in dull chrome US26D. Each of those ships without a core so the core can be pulled from the facility's existing system.
13) Can a locksmith cut extra keys for a Medeco Maxum deadbolt?
Not at a counter key machine, and that is the point of the lock. The Maxum's M4 keys use angled cuts and need a Medeco-specific key machine and Medeco blanks, and the design includes a movable element in the key aimed at blocking unauthorized duplication, including 3D-printed copies or blanks. Plan on ordering keys through a Medeco channel rather than having a tenant or a super run off spares. If you want a lock anyone can copy keys for locally, a Schlage C keyed deadbolt like the Hager 3215 is the opposite trade.
14) Is the Medeco Maxum a deadbolt on its own, or does it include a knob or lever?
Deadbolt only. The 110A1911 is a bored deadbolt, cylinder outside and thumbturn inside, with a box strike included. It does not latch the door and it has no handle, so the opening still needs a knobset, leverset, or passage set bored below it to keep the door closed and to operate it. If you want the deadbolt and the lever tied together as one unit, that is an interconnected lock, a different product, such as the Falcon H2101 entrance interconnected lock with a single cylinder deadbolt.
15) Can I use the Medeco Maxum deadbolt on a classroom door or a stairwell where the inside has to stay lockable by key?
No. Cylinder by thumbturn means the inside turns free by hand, so it cannot be locked or held from the corridor side by key. For a classroom deadlock where the function is keyed outside with a blank plate inside, the Corbin Russwin DL3011 or DL3211 Grade 1 cylindrical deadlocks are the correct type, and for a non-keyed exit deadlock the Arrow E60 is blank plate by thumbturn. Note the door ranges differ: the DL3211 is listed at 1-3/4 inches and the DL3011 at 1-3/4 to 2-1/4 inches, both narrower than the Maxum's 1-3/8 to 2-1/2 inches.
16) I need Grade 1 deadbolts across a whole apartment building. Is the Medeco Maxum the right pick for every unit?
It depends on whether you need key control on all of them or just some. The Maxum is a Grade 1 heavy duty deadbolt built for residential entry use, and where it earns its keep is on doors where a copied key is the real exposure: main entries, mechanical rooms, manager units. Because it master keys on the M4 platform, you can run those doors on one system. For tenant doors where key control is not the concern, other Grade 1 single cylinder options in the same function, cylinder by thumbturn, include the Delaney LM Series, the Dexter DB1000, and the Deltana CL200LM. Standardizing on the Maxum only where the risk sits, and a plain Grade 1 elsewhere, is the usual way this gets specified.
17) What is a simpler Grade 2 alternative to the Medeco Maxum deadbolt for lower-security interior or back-of-house doors?
For openings that do not need the Maxum's UL 437 Listed Medeco 4 cylinder, several Grade 2 cylinder x thumbturn deadbolts cover the same single-cylinder function. The Arrow DBX61 is a Grade 2 single cylinder deadbolt in the DBX Series. The Dexter DB2000 single cylinder deadbolt is Grade 2 cylinder x thumbturn for doors 1-3/8 inch to 1-3/4 inch. The Cal-Royal CB160 is a Grade 2 single cylinder deadbolt with a tamper-resistant cylinder guard. All three operate by key outside and thumbturn inside like the Maxum, at BHMA Grade 2 instead of the Maxum's Grade 1.
18) How does the Medeco Maxum compare to a mortise deadbolt like the Dormakaba D900 for retrofit?
The Medeco Maxum 110A1911 is a bored tubular deadbolt that installs into a standard 2-1/8 inch crossbore and 1 inch edge bore per ANSI A115.13, with a 2-3/8 inch backset and a 2-1/4 inch x 1 inch faceplate. The Dormakaba D900 is a small case mortise deadbolt with a D cylinder, cylinder x thumbturn function, keyed different with SC keyways, and it requires a mortise pocket cut into the door edge rather than a bored prep. The Emtek 2050 and 2051 are European mortise deadbolts with an integrated roller latch, also cylinder x thumbturn and also mortise prep. A door already bored for a tubular deadbolt takes the Maxum directly; a door with an existing mortise pocket calls for one of the mortise cases.
19) Can an electronic deadbolt replace the Medeco Maxum for keyless access on a multi-tenant property?
The Medeco Maxum 110A1911 is a mechanical deadbolt whose access control comes from the Medeco 4 key system, which supports master keying across M4, M4 BiLevel and M4 CLIQ cylinders. For credential-based access instead of keys, the Dormakaba Saffire LX-D is an RFID electronic deadbolt with BLE and electronic lock override, and the Dormakaba Nova-D is an RFID multihousing smart electronic deadbolt. The Codelocks CL2200 is a medium duty electronic surface deadbolt in a brushed steel finish, and the Delaney KP400 is a Grade 2 electronic deadbolt with a programmable remote. These replace key issuance with credentials or codes; the Maxum keeps a purely mechanical, UL 437 Listed cylinder with no power or battery in the opening.
20) Is the BEST 8T tubular deadbolt tube a substitute for the Medeco Maxum 110A1911?
No. The Medeco Maxum 110A1911 is a complete single cylinder deadbolt with a 1 inch hardened steel bolt, thumbturn, high-security strike plate with 2 inch structural screws, and the Medeco 4 cylinder. The BEST 8T is the tubular deadbolt tube component of the T Series - the latch body alone, not a finished lock. The Baldwin Reserve 8BR0618001 is likewise a deadbolt spacer, a thickness accessory for double cylinder trim rather than a lock. Neither secures a door on its own, so neither replaces the Maxum on an opening.
21) Is the Falcon D111 classroom deadbolt the same function as the Medeco Maxum 110A1911?
Both are Grade 1 cylinder x thumbturn deadbolts, but they are specified for different openings. The Medeco Maxum 110A1911 is a heavy duty residential and commercial entry deadbolt on the Medeco 4 high-security platform with a fixed 2-3/8 inch backset. The Falcon D111 is a Grade 1 heavy duty classroom deadbolt in the D100 Series with an adjustable backset, and the Falcon D211 is the Grade 2 medium duty classroom-function version in the D200 Series. Classroom function governs how the bolt is controlled from each side of the door, so confirm the door's intended lockdown behavior before treating a classroom deadbolt as a drop-in for an entry deadbolt.
22) Is there a deadbolt with an ADA-friendly thumbturn to use in place of the Medeco Maxum?
The Medeco Maxum 110A1911 is a cylinder x thumbturn deadbolt with a standard turn. Where the opening needs an easier-grip turn piece, the Cal-Royal LSD is a Grade 3 single cylinder deadbolt with an ADA ergonomic thumbturn for doors 1-3/8 inch to 1-3/4 inch thick, in the Chelsie LSD Series. It is a Grade 3 lock against the Maxum's Grade 1 certification, and it does not carry the Maxum's UL 437 Listed high-security cylinder, so it fits openings where thumbturn accessibility outweighs attack resistance.
23) Can I use the Medeco Maxum on a door that also needs a latch, or do I need an interconnected lock?
The Medeco Maxum 110A1911 is a deadbolt only, with a 1 inch hardened steel bolt and no latchbolt, so a door needing both latching and deadlocking takes a second device or an interconnected set. The Falcon H2101 is a Grade 2 entrance interconnected lock with a single cylinder deadbolt in the H2 Series, combining both functions in one prep. The Emtek 2050 and 2051 European mortise deadbolts include an integrated roller latch alongside the cylinder x thumbturn deadbolt. Where an existing mortise lock case handles the latchbolt and deadbolt, the Arrow 460 is a mortise lock strike with straight lip for latchbolt and deadbolt functions on 1-3/4 inch doors.
24) What decorative deadbolt matches the Medeco Maxum's finish range for a high-end entry?
The Medeco Maxum 110A1911 comes in 606 satin brass, 609 antique brass, 610 satin brass blackened, 612 satin bronze, 624 dark bronze and 626 satin chrome, all on a functional deadbolt-only trim. Where the entry calls for decorative trim, the Emtek #11 Tuscany is a lost wax cast bronze cylinder x thumbturn deadbolt, and the Baldwin Estates 8011 is a contemporary 1-5/8 inch double cylinder deadbolt in the Estate Series. The Baldwin Reserve contemporary round and square double cylinder deadbolts offer round and square trim shapes. Those are decorative styles rather than UL 437 Listed high-security cylinders, and the Baldwin options listed are double cylinder rather than the Maxum's cylinder x thumbturn.
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