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Bright brass double cylinder deadbolt with three keys

Em-D-Kay Padlocks

Em-D-Kay Padlocks MDKD30603 Double Cylinder Deadbolt Bright Brass US3 Adjustable Latch SC4 Keyway

SKU CH-GM9G-29SAD MPN MDKD30603

Commercial-grade double-cylinder deadbolt in bright brass with adjustable 2-3/8" to 2-3/4" backset and SC4 keyway, supplied with three keys

  • Lock keyingKeyed Different
  • Surface finishBright Brass
  • Double cylinder requires a key on both sides
  • Bright brass US3 finish resists corrosion and wear
  • Commercial-grade construction withstands heavy daily use
  • Adjustable latch fits 2-3/8" to 2-3/4" backset doors
  • SC4 keyway works with standard SC4 keys

Double Cylinder Deadbolt

The Em-D-Kay MDKD30603 is a commercial-grade double cylinder deadbolt finished in Bright Brass US3. It uses an SC4 keyway and ships with three keys. This lock suits exterior doors that require keyed entry from both sides for controlled access.

Adjustable Latch 2-3/8" to 2-3/4" Backset

The adjustable latch fits standard door preparations with a backset between 2-3/8 inches and 2-3/4 inches. It covers the two most common residential and commercial backset measurements. Doors with a backset outside this range cannot use this latch.

Double Cylinder Operation

A key is required to lock or unlock the bolt from either the interior or exterior. This prevents intruders from reaching through glass to turn a thumb-turn, but it also means occupants need a key to exit in an emergency. Verify local fire codes before installing on egress doors.

How it compares

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

Price $40.99
Cheaper than about 56% of the 2,145 comparable items (median $55.99).

Specifications

Product
Brand nameEm-D-Kay Premium Security Products
Model nameMDKD30603
Size & build
Surface finishBright Brass
More details
Lock keyingKeyed Different

Questions about this item

Will the MDKD30603 adjustable latch cover my existing 2-3/8" backset door prep?

Yes, the latch adjusts from 2-3/8" to 2-3/4" backset to match common door preparations.

How can I confirm the deadbolt throws and retracts correctly after fitting?

Test each side with the supplied keys; the bolt should extend fully into the strike and retract smoothly without binding.

Does the box include a strike plate and mounting screws, or must I buy them separately?

The package contains the deadbolt, adjustable latch, and three keys; strike plate and screws are not included.

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