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Bright brass single cylinder deadbolt with rectangular faceplate and round thumbturn

Medeco

Medeco 11-R503-605-00 Bright Brass Grade 1 Single Cylinder Deadbolt 2-3/8" Backset 1" Faceplate door lock

SKU CH-0X7X-4R7G7 MPN 11-R503-605-00

Grade 1 single-cylinder deadbolt with 5-pin tumbler, anti-drill and anti-pry protection, fitting doors 1-3/8 to 2-1/2 inches thick

  • Surface finishBright Brass
  • Sold asBox
  • Grade 1 certification delivers proven high-security resistance
  • 5-pin tumbler with Original 00 keyway resists picking and unauthorised duplication
  • Solid brass construction with anti-drill and anti-pry features withstands physical attack
  • ANSI/BHMA A156.30 and UL437 listed cylinders meet rigorous industry standards
  • Adjustable 2-3/8" backset and 1" faceplate fit doors 1-3/8" to 2-1/2" thick

Medeco Maxum Grade 1 Deadbolt

The Medeco Maxum 11-R503-605-00 is a single-cylinder tubular deadbolt built to ANSI/BHMA Grade 1 standards. Its solid-brass construction with Bright Brass finish suits commercial doors and heavy-duty residential entries where high physical security is required.

5-Pin Tumbler With Original 00 Keyway

The cylinder uses a 5-pin tumbler mechanism on the Medeco Original 00 keyway, delivering triple locking action that resists picking and unauthorised key duplication. It handles standard door thicknesses from 1-3/8" to 2-1/2" but cannot be used on thinner or thicker panels without modification.

ANSI/BHMA A156.30 And UL437 Listed

The lock meets ANSI/BHMA A156.30 and carries a UL437 listing for high-security cylinders, confirming resistance to drilling and prying attacks. It fits a 2-1/8" crossbore and 1" edge bore with a 2-3/8" backset and 1" faceplate; doors prepared to other dimensions will not accept this hardware.

How it compares

Measured against everything we stock in Door Lock Sets & Deadbolts, at today’s prices. Recalculated every night.

Price $365.99
Pricier than about 90% of the 2,145 comparable items (median $55.99).

Specifications

Product
Brand nameMedeco
Model name11-R503-605-00
Size & build
Surface finishBright Brass

Questions about this item

Will the 2-3/8" backset and 1" faceplate line up with the bore holes already cut in my door?

Yes — the deadbolt is built for a 2-1/8" crossbore and a 1" edge bore, which are the standard prep dimensions for this backset and faceplate combination.

How can I verify the lock meets the Grade 1 and UL 437 ratings after I install it?

Operate the key and thumbturn through several full cycles; the bolt should throw smoothly into the strike without binding, and the cylinder will resist picking and drilling attempts per the UL 437 listing.

Does the box include a strike plate and mounting screws, or do I need to purchase them separately?

The lock ships in a single box containing the cylinder, bolt assembly, thumbturn, strike plate and all mounting hardware needed for a door 1-3/8" to 2-1/2" thick.

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