Medeco 11C28 Maxum Commercial ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$246.00
$166.37
Medeco Medeco Maxum Commercial Deadbolt Lock, Blank Plate, Inside Thumbturn MED-DEADBOLT-11C28

Medeco 11C28 Maxum Commercial Deadbolt Lock with Blank Plate and Inside Thumbturn

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Model: MED-11C281-26
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$246.00
$166.37
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Medeco 11C28 Maxum Commercial Deadbolt Lock with Blank Plate and Inside Thumbturn

The Medeco Maxum 11C28 Commercial Deadbolt Lock is a heavy-duty, high-security deadbolt engineered for demanding commercial and residential applications where maximum protection is required. Built with solid-brass construction and featuring ANSI/BHMA A156.36 Grade 1 certification and UL 437 listing, this deadbolt fits doors 1 3/8" to 2 1/2" thick and installs into a standard 2 1/8" crossbore and 1" edge bore (ANSI A115.13 prep). The captive thumbturn converts the inside cylinder to a thumbturn for easy, code-compliant egress when the facility is occupied, while the blank plate provides a clean exterior appearance for non-keyed configurations.

Key Features

  • Door Thickness Compatibility: Fits doors 1 3/8" to 2 1/2" thick, accommodating a wide range of commercial and residential door constructions.
  • Standard Door Prep: Designed for a standard 2 1/8" crossbore and 1" edge bore per ANSI A115.13 preparation for straightforward installation.
  • Solid-Brass Construction: Heavy-duty solid-brass body provides exceptional resistance to physical attack, including prying, drilling, and forced entry attempts.
  • Drill Protection: Strategically placed drill pins within the solid-brass construction offer maximum resistance against drill attacks.
  • Picking and Bumping Protection: M4 cylinders utilize cylinder side pins, a shuttle lift pin, and a movable key element to engage a sidebar that prevents the key from turning until all elements are correctly rotated and aligned, protecting against bumping, picking, and other attacks.
  • Key Control: Patent-pending key control protects against unauthorized duplication of keys (Medeco 4), requiring a special key cutting machine and access to Medeco-specific blanks available in a variety of restrictions.
  • Protection Against 3D Printing: A patent-pending movable element in the key deters unauthorized 3D printed copies of keys or blanks.
  • Master Keying Capabilities: M4 deadbolts can be master keyed into a system that includes M4, M4 BiLevel, and M4 CLIQ keys and cylinders, supporting extremely large systems.
  • Captive Thumbturn Inside: Converts the inside cylinder to a thumbturn for easy exit when the facility is occupied, combining security with convenient egress.
  • Wide Finish Selection: Available in 14 finishes including Bright Brass, Satin Brass, Antique Brass, Satin Brass Blackened, Bright Bronze, Satin Bronze, Oil Rubbed Bronze, Bright Nickel, Satin Nickel, Antique Nickel, Black, Dark Bronze, Bright Chrome, and Satin Chrome.

Certifications & Compliance

  • ANSI/BHMA A156.36 Grade 1 Certified
  • UL 437 Listed — High Security Cylinders
  • BHMA Certified Grade 1 — Passes to the highest standards in the industry

Technical Specifications

  • Series: Maxum® Commercial Deadbolt
  • Cylinder Technology: Medeco 4 (M4)
  • Pinning: 6-Pin
  • Keyway: Factory-specified
  • Cylinder Format: Fixed Cylinder
  • Certification: UL 437 Listed; ANSI/BHMA A156.36 Grade 1 (M4)
  • 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

  • Commercial Office Buildings
  • Hospitals and Healthcare Institutions
  • Educational Facilities and Schools
  • Restaurants and Food Service Establishments
  • Retail Outlets and Storefronts
  • Apartment Buildings and Multi-Tenant Residential Properties
  • Government and Municipal Buildings

Why Medeco?

Medeco Maxum deadbolts deliver professional-grade security through solid-brass construction, UL 437 listed cylinders, and ANSI/BHMA A156.36 Grade 1 certification — meeting the highest standards in the industry. The M4 cylinder's patent-pending key control, anti-picking sidebar mechanism, and 3D-print-deterrent movable key element make the Maxum one of the most comprehensively attack-resistant deadbolts available for commercial and residential applications where consistent quality and ease of installation are required.

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:
Commercial
Lock Function:
Deadbolt
Grade:
Grade 1
Duty Level:
Heavy Duty
Keyed:
No
Keyed Function:
Non-Keyed
Product Attribute:
Deadbolts
Product Model:
11C28
Product Function:
Blank Plate x Thumbturn
Product Category:
Mechanical Locks
Department:
Door Hardware

Medeco MED-11C281-26 – Frequently Asked Questions

1) Will the Medeco 11C28 Maxum deadbolt fit a 2 inch thick door?
Yes. The 11C28 Maxum commercial deadbolt covers doors from 1-3/8 inches up to 2-1/2 inches thick, so a 2 inch door is inside the range with room to spare. That upper end is unusual for a bored deadbolt; most competing units stop at 1-3/4 inches, which is why thick storefront and older institutional doors often force a mortise deadlock instead. Here you can stay with a standard bored prep.
2) What door prep does the Medeco Maxum 11C28 deadbolt need, and can it drop into an existing deadbolt hole?
It takes a standard 2-1/8 inch crossbore with a 1 inch edge bore, per ANSI/BHMA A115.13 prep. That is the same prep the vast majority of commercial bored deadbolts use, so if a door already carries a bored deadbolt cut to A115.13 the Maxum goes into the existing holes. What you do have to match is backset: the 11C28 is ordered as either 2-3/8 inch or 2-3/4 inch, both with a 1-1/8 inch faceplate. Measure from the door edge to the center of the crossbore before you order, because the wrong backset will not line up with the existing bore.
3) There is no key cylinder on the outside of the 11C28 Medeco deadbolt. Is that right?
That is the intended configuration. The 11C28 is a blank plate outside by thumbturn inside, so there is no keyed access from the exterior at all, and it ships non-keyed. It throws and retracts only from the inside. This is the deadbolt for a back door, stockroom, or exit-only opening that staff secure from within and that nobody needs to key open from outside. If you need key access from the outside, the 11C28 is the wrong model.
4) Can you get out without a key if this deadbolt is thrown? Deadbolt egress for an occupied space
The inside is a captive thumbturn, so anyone inside retracts the bolt by hand with no key and no free-spinning turn to lose. That is what makes it workable on an occupied space where people have to leave without hunting for a key. The tradeoff is that there is no outside cylinder on the 11C28, so it is a secure-from-within opening only.
5) Is the Medeco Maxum 11C28 Grade 1, and does it meet a high security spec?
Grade 1 under ANSI/BHMA A156.36, and the cylinder is UL 437 listed for high security. That combination is what a spec writer usually means by high security deadbolt: Grade 1 covers the physical strength and cycle testing, UL 437 covers attack resistance of the cylinder against picking and drilling. Body is solid brass with hardened steel inserts and drill pins. Note the 11C28 itself is a blank plate version, so the UL 437 cylinder sits on the inside as the captive thumbturn.
6) What is a good alternative to the Medeco Maxum if I want a Grade 1 deadbolt with a key cylinder on the outside?
The Maxum 11C28 is blank plate outside, so it cannot be keyed from the exterior. For a Grade 1 deadbolt with an outside cylinder and inside thumbturn, the Accentra D111 is a Grade 1 single cylinder deadbolt with a 2-3/8 inch backset covering 1-3/8 to 1-3/4 inch doors, the Falcon D111 is Grade 1 heavy duty with an adjustable backset, and the Dexter DB1000 Grade 1 single cylinder covers 1-3/8 to 1-7/8 inch doors. None of those carry the Medeco M4 patented key control, so if restricted keying is the point, keep the Medeco platform and pick a keyed Maxum function instead.
7) What is the closest non-keyed alternative to the Medeco 11C28 for an exit only door?
The Arrow E60 is the direct functional match: blank plate outside by thumbturn inside, non-keyed, for doors 1-3/8 to 1-3/4 inches thick. It is Grade 2 rather than Grade 1, and it does not carry the UL 437 cylinder or the M4 key control, so it suits a lower traffic or lower risk exit door. Two things push you back to the Medeco: doors thicker than 1-3/4 inches, which the E60 does not cover and the Maxum does up to 2-1/2 inches, and any requirement for Grade 1.
8) Is there a non-keyed exit deadbolt equivalent to the Medeco 11C28 for an opening that does not need high security cylinder protection?
Yes. The Arrow E60 is a non-keyed exit deadlock with the same blank plate by thumbturn function as the Medeco 11C28 Maxum, in Grade 2, fitting doors 1-3/8 inch to 1-3/4 inch thick. The 11C28 is Grade 1 and fits doors 1-3/8 inch to 2-1/2 inch, so the Arrow covers the narrower door range and the Medeco covers thicker doors and the higher grade.
9) Does the Medeco 11C28 accept a small format interchangeable core, and what should I order if my facility is standardized on SFIC?
The Medeco 11C28 Maxum uses a fixed 6-pin Medeco 4 cylinder, not an interchangeable core. If your keying program runs on SFIC, 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 interchangeable core deadbolt with a 2-3/4 inch backset. The Delaney LM Series Grade 1 deadbolt also ships less core.
10) Can I substitute a double cylinder deadbolt for the Medeco 11C28 Maxum?
They are different functions. The 11C28 Maxum is blank plate outside with a captive thumbturn inside, which keeps egress key-free. A double cylinder deadbolt requires a key on both sides: 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 Series double cylinder is Grade 1 for 1-3/8 inch to 1-7/8 inch doors. Confirm your local egress code before putting a key-both-sides deadbolt on a door the 11C28 would have covered with a thumbturn.
11) Which deadbolt should I use instead of the Medeco 11C28 on a fire rated opening?
For openings where you need a stated fire rating on the deadbolt, the Hager 3118 is a Grade 1 classroom deadbolt with a Schlage C keyway and 6-pin cylinder carrying a fire rating and fitting 1-3/8 inch to 1-3/4 inch doors, and the Cal-Royal CRB800 is a Grade 1 heavy duty single cylinder deadbolt with a UL 3-hour fire rated latch. Both are cylinder by thumbturn, unlike the blank plate exterior of the 11C28 Maxum.
12) Can the Medeco 11C28 be master keyed into our existing building key system?
The M4 cylinder in the Maxum master keys into a system built from M4, M4 BiLevel, and M4 CLIQ cylinders and keys, and it will scale to very large systems, so a campus or multi building portfolio can sit on one hierarchy. Pinning is 6-pin and the keyway is factory specified, which means the keying is set when the order is placed rather than in the field. One caveat specific to the 11C28: it is the blank plate version, so it contributes the thumbturn side only, and it ships non-keyed.
13) Why pay for a Medeco M4 cylinder instead of a standard commercial deadbolt?
It comes down to key control and attack resistance. M4 uses side pins, a shuttle lift pin, and a movable key element driving a sidebar, so the key will not turn until every element is rotated and aligned, which is what defeats bumping and picking. Keys need a special cutting machine and Medeco-specific restricted blanks, so a tenant or contractor cannot walk into a hardware store and copy one, and the movable element in the key also deters 3D printed copies. A standard Grade 1 deadbolt such as the Delaney LM Series or the Deltana CL200LM gives you the physical grade without the restricted keying. If your problem is unauthorized key duplication across a portfolio, that is the difference you are buying.
14) Is the Medeco 11C28 a mortise deadbolt or a bored one?
Bored, not mortise. It drills into the door face with a 2-1/8 inch crossbore and a 1 inch edge bore rather than needing a pocket cut into the door edge, which is why it installs on an existing door in minutes instead of requiring a mortise machine. If the opening already has a mortise pocket, the Maxum is the wrong body style and you want a mortise deadlock such as the Dormakaba D900 small case mortise deadbolt instead.
15) What is a simpler Grade 1 deadbolt than the Medeco 11C28 for an interior door that does not need restricted keying?
The Medeco 11C28 Maxum carries a Medeco 4 high security cylinder with UL 437 listing and restricted key blanks. If you want Grade 1 holding power without a restricted keyway, the Delaney LM Series is a Grade 1 single cylinder less core deadbolt in dull chrome US26D, the Deltana CL200LM is a Grade 1 single cylinder deadbolt, and the Dexter DB1000 Series single cylinder is Grade 1 for doors 1-3/8 inch to 1-7/8 inch. All three are cylinder by thumbturn, so they key the outside rather than using the 11C28 blank plate.
16) The Arrow 460 comes up when I search deadbolts. Is it an alternative to the Medeco 11C28?
No. The Arrow 460 is a mortise lock strike for latchbolt and deadbolt functions with a straight lip, sized for 1-3/4 inch doors. It is the strike that receives a bolt, not a lock. The Medeco 11C28 Maxum is the deadbolt itself, installing into a 2-1/8 inch crossbore and 1 inch edge bore. The BEST 8T is likewise a tubular deadbolt tube component from the T Series rather than a complete deadbolt.
17) Is there an electronic deadbolt I can use in place of the Medeco 11C28 for credential based access?
The Medeco 11C28 Maxum is a mechanical deadbolt with a mechanical M4 cylinder and no electronic credential. If you want electronic access on the same door type, the Dormakaba Saffire LX-D is an RFID electronic deadbolt with BLE and electronic lock override, the Dormakaba Nova-D is an RFID multihousing smart electronic deadbolt, and the Codelocks CL2210 is an electronic mortise deadbolt. Note the Codelocks CL2200 surface deadbolt is medium duty, while the 11C28 is heavy duty.
18) I am standardizing apartment entry doors. How does the Medeco 11C28 compare to the Grade 2 and Grade 3 deadbolts for that program?
The Medeco 11C28 Maxum is Grade 1 heavy duty and commercial rated, with a blank plate outside and captive thumbturn inside. The common Grade 2 fleet options are cylinder by thumbturn: the Arrow DBX61, the Cal-Royal CB160 with a tamper-resistant cylinder guard, the Dexter DB2000 single cylinder for 1-3/8 inch to 1-3/4 inch doors, and the Bravura 310B Elite. At Grade 3 there is the Cal-Royal LSD with an ADA ergonomic thumbturn and the Cal-Royal ED500 with an adjustable backset, both for 1-3/8 inch to 1-3/4 inch doors. The 11C28 differs in grade and in having no exterior keyway.
19) My door is prepped for 2-3/8 inch backset but the field crew sometimes hits 2-3/4 inch. What deadbolts handle that besides ordering a fixed backset?
The Medeco 11C28 Maxum is ordered by fixed backset, either 2-3/8 inch or 2-3/4 inch, both with a 1-1/8 inch faceplate. If you would rather carry one part that adjusts in the field, the Falcon D111 is a Grade 1 classroom deadbolt with an adjustable backset, the Cal-Royal ED500 is Grade 3 with an adjustable backset, and the Brinks Raleigh Series is a single cylinder deadbolt with a 4 way adjustable backset.
20) The Medeco 11C28 needs a 2-1/8 inch crossbore. What should I use on a door I cannot bore through?
The Medeco 11C28 Maxum installs into a standard 2-1/8 inch crossbore and 1 inch edge bore per ANSI A115.13. Where a full through-bore is not an option, the Callan Model 205S is a Grade 3 one-sided half-bore deadbolt, and the Codelocks CL200 is a surface mounted deadbolt with key override. For a mortise pocket rather than a bored door, the Dormakaba D900 small case mortise deadbolt is cylinder by thumbturn with SC keyways.
21) What finish choices are there on the Medeco Maxum deadbolt to match the rest of our door hardware?
Fourteen finishes, ordered by BHMA number: 605 bright brass, 606 satin brass, 609 antique brass, 611 bright bronze, 612 satin bronze, 613 dark bronze oil-rubbed, 618 bright nickel, 619 satin nickel, 20 antique nickel, 622 flat black, 624 dark bronze, 625 bright chrome, 626 satin chrome, plus satin brass blackened. For a fleet of commercial openings 626 satin chrome and 613 oil-rubbed bronze are the two that most often match existing levers and closers. Every finish is available on both the 2-3/8 and the 2-3/4 inch backset.
22) Is the Medeco Maxum 11C28 heavy duty enough for an apartment building or school back door?
It is rated heavy duty and built for commercial use, with a solid brass body, hardened steel inserts, and drill pins placed to resist drilling. Grade 1 is the highest ANSI/BHMA level, which is what multi-tenant residential, schools, healthcare, and municipal buildings normally spec on exterior openings. On an exit-only or service door where nobody keys in from outside, the blank plate 11C28 removes the outside cylinder entirely, which also removes it as an attack point.
23) I need a deadbolt in a decorative brass or bronze finish. Is the Medeco 11C28 the right pick or should I look at a residential line?
The Medeco 11C28 Maxum is a commercial Grade 1 deadbolt offered in 14 finishes including Bright Brass 605, Satin Brass 606, Antique Brass 609, Oil Rubbed Bronze, Satin Nickel 619 and Satin Chrome 626. For a decorative residential look instead, the Emtek #11 Tuscany is a lost wax cast bronze cylinder by thumbturn deadbolt, the Emtek 8323 Modern Disc is a brass double cylinder deadbolt, and the Baldwin Reserve is available in contemporary round and square double cylinder trims. Those Emtek and Baldwin double cylinder options key both sides rather than using the 11C28 thumbturn-only inside.
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Does the Medeco MED-11C281-26 come with a warranty?
Absolutely. The Medeco MED-11C281-26 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
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