Medeco 110A1921 Maxum Series H...
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Medeco 110A1921 Deadbolt Only for Maxum Deadbolts, 2-3/4" Backset, 2-1/4" x 1" Faceplate

Medeco 110A1921 Maxum Series High-Security Deadbolt, 2-3/4" Backset, 2-1/4" x 1" Faceplate, UL 437 Listed

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Model: 110A1921-26
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Medeco 110A1921 Maxum Series High-Security Deadbolt — 2-3/4" Backset, 2-1/4" x 1" Faceplate, UL 437 Listed

The Medeco 110A1921 is a heavy-duty, high-security deadbolt from the Maxum Series, engineered for maximum protection against unauthorized key duplication, picking, drilling, bumping, wrenching, and physical attack. Featuring a solid 1" hardened steel bolt housed in heavy-gauge tubular steel, this deadbolt accommodates a 2-3/4" backset and a 2-1/4" x 1" faceplate, fitting doors 1-3/8" to 2-1/2" thick with a standard 2-1/8" crossbore and 1" edge bore (ANSI A115.13 prep). UL 437 Listed and BHMA A156.5 Grade 1 Certified, the Medeco Maxum delivers unmatched residential and commercial security with the Medeco 4 (M4) key control system.

Key Features

  • Precise Backset & Faceplate Dimensions: Designed with a 2-3/4" backset and 2-1/4" x 1" faceplate for accurate, code-compliant installation on standard door preparations.
  • Door Thickness Compatibility: Fits doors 1-3/8" to 2-1/2" thick with a standard 2-1/8" crossbore and 1" edge bore (ANSI A115.13 prep) for broad compatibility.
  • Solid 1" Hardened Steel Bolt: A solid 1" hardened steel bolt in a heavy-gauge tubular steel housing provides maximum resistance to physical attack, including crowbar and kick-in attempts.
  • Medeco 4 (M4) Key Control: Patent-pending key control technology protects against unauthorized key duplication, including 3D-printed copies, with special angle-cut keys requiring Medeco-specific blanks and cutting equipment.
  • Drill & Pick Resistance: Hardened steel inserts, rotating pins, and strategically placed drill pins provide robust resistance to drilling and picking attacks per UL 437 standards.
  • Steel Shroud & High-Security Strike Plate: Steel shroud over the bolt guards against "ice pick" attacks; included high-security strike plate features a box design with 2" screws anchoring directly to the building structure to prevent kick-in attacks.
  • Master Keying Capability: M4 deadbolts can be master keyed into large systems supporting M4, M4 BiLevel, and M4 CLIQ keys and cylinders for maximum flexibility.
  • Solid-Brass Construction: Solid-brass cylinder construction with strategically placed drill pins delivers maximum drill protection and long-term durability.

Certifications & Compliance

  • UL 437 Listed — High Security Cylinder
  • BHMA A156.5 Grade 1 Certified
  • ANSI/BHMA A156.36 Grade 1 Certified Cylinders
  • BHMA A156.30 Certification for Key Control
  • 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
  • Educational Facilities
  • Healthcare Institutions
  • Government and Municipal Buildings
  • Multi-Tenant Residential Properties
  • Retail Establishments Requiring Key Control

Why Medeco?

Medeco Maxum deadbolts are built to the most demanding security standards, combining a solid 1" hardened steel bolt, solid-brass cylinder construction, and the patented Medeco 4 key control system to resist every major form of physical and covert attack. With UL 437 Listing, BHMA A156.5 Grade 1 Certification, and BHMA A156.30 key control certification, the Maxum Series represents the pinnacle of mechanical deadbolt security for professionals who demand proven, certified performance.

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:
110A1921
Product Function:
Cylinder x Thumbturn
Keyway Options:
DL Keyway
Product Category:
Mechanical Locks
Department:
Door Hardware

Medeco 110A1921-26 – Frequently Asked Questions

1) Is the Medeco 110A1921 keyed on both sides or does it have a thumbturn inside?
Single cylinder: key outside, thumbturn inside. That is the configuration most codes want on an egress door, since nobody needs a key to get out. If you specifically need key-both-sides, this is the wrong part and you want a double cylinder deadbolt instead, such as the Delaney LU Series or the Design Hardware D1 Series Grade 1 double cylinder.
2) Will the Medeco Maxum deadbolt stop someone kicking the door in?
The bolt itself is a solid 1 inch hardened steel bolt in a heavy-gauge tubular steel housing, with a steel shroud over it to block ice pick attacks. The bigger factor on a kick-in is the strike: the Maxum ships with a high-security box strike using 2 inch screws that reach past the jamb into the framing. That anchoring is what resists the kick, and it means you need solid framing behind the jamb for the install to be worth anything.
3) Do I need Medeco keys and blanks for the 110A1921, or can a local shop copy them?
You are buying into Medeco 4 (M4) key control. The keys are angle cut and require Medeco-specific blanks and cutting equipment, so a corner hardware store cannot duplicate them and neither can a 3D-printed copy. That is the point of the product: on a multi-tenant building or a facility with turnover, keys do not walk. If uncontrolled copies are fine for your application, a conventional Grade 1 deadbolt like the Accentra D111 or the Delaney LM Series makes more sense.
4) Can the Medeco Maxum deadbolt be master keyed into a building system?
Yes. M4 deadbolts master key into large systems alongside M4, M4 BiLevel, and M4 CLIQ keys and cylinders, so you can put mechanical deadbolts on the low-traffic openings and electronic CLIQ cylinders where you need audit trail, all under one key hierarchy. Keying is factory specified, and the keyway offered here is the DL keyway, which is what your existing system has to be on for these to fold in.
5) What ratings does the Medeco 110A1921 deadbolt actually carry?
UL 437 Listed as a high security cylinder, BHMA A156.5 Grade 1 certified, ANSI/BHMA A156.36 Grade 1 certified cylinders, and BHMA A156.30 certification for key control. For a spec writer that combination matters: A156.5 Grade 1 is the lock strength number, A156.36 and UL 437 cover attack resistance on the cylinder, and A156.30 is the one that backs up the key control claim. Most deadbolts in this class carry one or two of those, not all four.
6) What is the closest Grade 1 single cylinder deadbolt to the Medeco Maxum 110A1921 if the door only takes a 2-3/8 inch backset?
The Medeco 110A1921 Maxum is built around a 2-3/4 inch backset with a 2-1/4 inch by 1 inch faceplate, so an opening bored at 2-3/8 inch needs a different bolt. The Accentra D111 is a Grade 1 single cylinder deadbolt in a cylinder x thumbturn function with a 2-3/8 inch backset, covering doors 1-3/8 inch to 1-3/4 inch thick. It matches the Maxum on grade and on function, and differs in that it is a conventional keyed deadbolt rather than a UL 437 high-security cylinder with M4 key control.
7) Which deadbolt handles a door thicker than 1-3/4 inches, the way the Medeco Maxum does?
The Medeco 110A1921 Maxum fits doors 1-3/8 inch to 2-1/2 inch thick on a standard 2-1/8 inch crossbore and 1 inch edge bore. Most tubular deadbolts stop short of that: the Dexter DB1000 single cylinder Grade 1 covers 1-3/8 inch to 1-7/8 inch, the Dexter DB2000 Grade 2 covers 1-3/8 inch to 1-3/4 inch, and the Deltana 7312KA2 Grade 3 double cylinder covers 1-3/8 inch to 2 inch. For a thick door in a cylindrical deadlock, the Corbin Russwin DL3011 Grade 1 is prepped for 1-3/4 inch to 2-1/4 inch doors in a cylinder x blank configuration.
8) Is there a Grade 1 deadbolt with a fire rating if the Medeco Maxum does not suit the opening?
For a labeled opening, the Cal-Royal CRB800 is a Grade 1 heavy duty single cylinder deadbolt with a UL 3-hour fire rated latch in a cylinder x thumbturn function. The Hager 3118 is a Grade 1 classroom deadbolt with a Schlage C keyway and a 6-pin cylinder, fire rated, for doors 1-3/8 inch to 1-3/4 inch. The Medeco 110A1921 Maxum is BHMA A156.5 Grade 1 certified and UL 437 listed for the cylinder, which is a high-security cylinder listing rather than a door assembly fire rating.
9) The Medeco Maxum is single cylinder - what is the double cylinder equivalent for a glass door?
The Medeco 110A1921 Maxum is a cylinder x thumbturn, single cylinder function, which means a thumbturn on the inside. Where an opening with glass beside it calls for a key on both faces, the Design Hardware D1 Series is a Grade 1 extra heavy duty double cylinder deadbolt for 1-3/4 inch doors, and the Dexter DB1000-DCT is a Grade 1 double cylinder deadbolt for doors 1-3/8 inch to 1-7/8 inch. Confirm the local code position on double cylinder locks at required egress doors before specifying either.
10) Is a mortise deadbolt like the Dormakaba D900 interchangeable with the Medeco Maxum 110A1921?
No, the door prep is different. The Medeco 110A1921 Maxum installs in a standard 2-1/8 inch crossbore with a 1 inch edge bore to ANSI A115.13, which is the bored prep. The Dormakaba D900 is a small case mortise deadbolt in a cylinder x thumbturn function, keyed different with SC keyways, and requires a mortise pocket cut into the door edge. The Emtek 2050 and 2051 are also European mortise deadbolts with an integrated roller latch, square and round respectively, and take a mortise prep rather than a crossbore.
11) Which deadbolt is keyed to a Schlage C keyway rather than the Medeco DL keyway?
The Medeco 110A1921 Maxum uses a DL keyway on the M4 platform, which keys into M4, M4 BiLevel, and M4 CLIQ systems and requires Medeco blanks and cutting equipment. If a building is already standardized on Schlage C, the Hager 3215 is a Grade 2 single cylinder deadbolt with a 1 inch throw and a Schlage C keyway, the Hager 3115 is a Grade 2 cylinder x thumbturn deadbolt with a Schlage C keyway, and the Hager 3214 is the double cylinder version. All three cover doors 1-3/8 inch to 1-3/4 inch and are fire rated.
12) What deadbolt fits a door bored for either 2-3/8 or 2-3/4 inch backset when the Medeco Maxum is fixed at 2-3/4?
The Medeco 110A1921 Maxum is specified with a 2-3/4 inch backset and a 2-1/4 inch by 1 inch faceplate. When the backset on the door is unconfirmed, an adjustable-backset deadbolt avoids a return: the Brinks Raleigh E2401 is a transitional round single cylinder deadbolt with a 4-way adjustable backset, the Brinks Mendocino E2402 is the contemporary square version with the same adjustment, the Cal-Royal ED500 is a Grade 3 single cylinder deadbolt with adjustable backset for 1-3/8 inch to 1-3/4 inch doors, and the Falcon D111 is a Grade 1 classroom deadbolt with adjustable backset.
13) How is the Medeco Maxum different from a standard Grade 1 commercial deadbolt?
Grade 1 is a strength rating, and plenty of deadbolts hold it. The Accentra D111 and the Delaney LM Series are both Grade 1 cylinder x thumbturn units. What the Maxum adds on top is the cylinder: UL 437 listing, hardened inserts, rotating pins and drill pins in a solid brass cylinder, plus M4 patented key control. So if your problem is a door getting forced, a conventional Grade 1 covers it. If your problem is keys being copied or the cylinder being picked or drilled, that is the gap the Maxum fills.
14) Is the 110A1921 a complete deadbolt or just the bolt assembly?
The 110A1921 is the deadbolt itself, cylinder outside and thumbturn inside, with the high-security strike plate included. It is a bored tubular unit, not a mortise case, so it drops into a standard 2-1/8 inch crossbore. It does not include a knob or lever, so if the opening needs a latch as well you are ordering a separate lockset or passage set to go under it.
15) Is the Medeco Maxum overkill for an apartment building, or should I use a cheaper deadbolt?
It comes down to key control, not strength. In a multi-tenant property where units turn over and you rekey constantly, the M4 system is the reason to spend here: tenants cannot get copies cut off-site. If the doors are interior or low-risk and you just need a solid bolt, a Grade 2 unit like the Arrow DBX61 or the Cal-Royal CB160 does the mechanical job, and the Cal-Royal CRB800 is a Grade 1 heavy duty single cylinder option. Mixing is normal: Maxum on the perimeter and entries, conventional deadbolts on the rest.
16) Does the Medeco 110A1921 come with a 5-pin or 6-pin cylinder?
The Maxum cylinder is built as 5 or 6-pin, and the pinning and keying are set at the factory when the order is placed. That is the detail to nail down before you order: if you are adding to an existing Medeco system, the pin count and keying have to match what the rest of the system was built to, and a mismatch means the key will not operate the lock even though the hardware is identical.
17) What deadbolt should be used instead of the Medeco Maxum on the inside of a door where no key is wanted?
The Medeco 110A1921 Maxum is keyed in a cylinder x thumbturn function. For a door that should be boltable from inside without any key at all, the Arrow E60 is a Grade 2 exit deadlock in a blank plate x thumbturn function for doors 1-3/8 inch to 1-3/4 inch, non-keyed. For the opposite arrangement, keyed outside with a blank inside, the Corbin Russwin DL3211 is a Grade 1 cylindrical deadlock in cylinder x blank for 1-3/4 inch doors. The Callan 205S is a Grade 3 one-sided half-bore deadbolt where the door is only bored through partway.
18) Will a BEST 8T tube or an Arrow 460 strike work as a replacement for a Medeco 110A1921?
Neither one is a substitute. The Medeco 110A1921 Maxum is a complete deadbolt with a 1 inch solid hardened steel bolt, steel shroud, and high-security strike plate with 2 inch screws. The BEST 8T is the tubular deadbolt tube component of the T Series, a subassembly rather than a finished lock. The Arrow 460 is a mortise lock strike for latchbolt and deadbolt functions with a straight lip, sized for 1-3/4 inch doors, so it is strike hardware for a mortise case and not a bored deadbolt.
19) What is the difference between the Medeco Maxum 110A1921 and a Grade 2 deadbolt like the Arrow DBX61 or Deltana CL200LA?
All three are cylinder x thumbturn single cylinder deadbolts. The Medeco 110A1921 Maxum is BHMA A156.5 Grade 1 with a 1 inch solid hardened steel bolt, drill pins, rotating pins, and a UL 437 listed M4 cylinder that resists key duplication. The Arrow DBX61 is a Grade 2 single cylinder deadbolt in the DBX Series, and the Deltana CL200LA is a Grade 2 single cylinder deadbolt with a 2-3/4 inch backset, matching the Maxum backset. Deltana also offers the CL200LAIC, a Grade 2 version prepped for an interchangeable core and supplied without the cylinder.
20) What is the alternative to the Medeco Maxum for a classroom function deadbolt?
The Medeco 110A1921 Maxum is a cylinder x thumbturn deadbolt, keyed outside with a thumbturn inside. A classroom function deadbolt keeps key control on both operations: 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 equivalent in the D200 Series with single cylinder operation. The Hager 3118 is another Grade 1 classroom deadbolt, with a Schlage C keyway and 6-pin cylinder.
21) What replaces the Medeco Maxum deadbolt when credentialed or electronic access is wanted at the same door?
The Medeco 110A1921 Maxum is a mechanical deadbolt whose access control lives in the M4 key system. For credential-based control on the same bored opening, the Dormakaba Saffire LX-D is an RFID electronic deadbolt with BLE and electronic lock override, and the Nova-D is an RFID multihousing smart electronic deadbolt in the Nova Series. The Codelocks CL2200 is a medium duty electronic surface deadbolt in brushed steel, and the Delaney KP400 is a Grade 2 electronic deadbolt with a programmable remote. For an electrically released bolt tied to an access system, the DynaLock 1300 Series is a heavy duty mortise electric deadbolt.
22) Which deadbolt has an ADA friendly thumbturn compared to the Medeco Maxum?
The Medeco 110A1921 Maxum is a heavy duty cylinder x thumbturn deadbolt built for security rather than for a specific thumbturn ergonomic. Where the thumbturn shape is the deciding factor, the Cal-Royal LSD is a Grade 3 single cylinder deadbolt in the Chelsie LSD Series with an ADA ergonomic 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 if attack resistance at the cylinder is the priority instead.
23) Which deadbolt matches decorative entry trim where the Medeco Maxum finish set does not?
The Medeco 110A1921 Maxum comes in 606 satin brass, 610 satin brass blackened, 612 satin bronze, 624 dark bronze, and 626 satin chrome, which is a commercial finish range. Where the door calls for a decorative escutcheon or cast trim, the Emtek #11 Tuscany is a lost wax cast bronze deadbolt in a cylinder x thumbturn function, the Baldwin Reserve contemporary round and square deadbolts are double cylinder, and the Bravura 310B Elite traditional round, 310RC Elite contemporary round, and 310SC Elite contemporary square are Grade 2 cylinder x thumbturn deadbolts in matching trim shapes.
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Absolutely. The Medeco 110A1921-26 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
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