Dr Lock Gainsborough 3000 Series Replacement Mortice Lock Kit - Dr Lock Shop

Dr Lock Gainsborough 3000 Series Replacement Mortice Lock Kit 3400

Product Overview

The Dr Lock Gainsborough 3000 Series Replacement Mortice Lock Kit 3400 is a purpose-designed solution by Dr Lock to replace existing Gainsborough 3000 mortice locks with a fire-rated mortice lock that fits the original footprint left by the old Gainsborough 3000 lock. (Patent 2022291530)

If you are viewing this product, you likely own a Gainsborough 3000, 3400, or 3500 mortice lock that has failed or suffered internal damage.

The manufacturer has discontinued this lock, likely due to internal faults developing over time. With no direct replacement from Gainsborough and the unique size and shape of the Gainsborough 3000 mortice lock differing from industry standards, many customers face a challenging situation.

When your Gainsborough 3400 mortice lock fails or jams, you have the following options:

• Replace the door and install a standard mortice lock – a very expensive option.
• Replace the broken lock with another Gainsborough 3000 mortice lock – unlikely, as these have not been manufactured for years.
• Install the Dr Lock Gainsborough 3000 mortice lock replacement kit – same door, same location.

This kit has been designed and finished (Pat 2022291530) to offer a cost-effective and convenient alternative for resolving Gainsborough 3000 lock issues. It allows locksmiths and handymen to replace the lock quickly and restore door functionality.

Not only does this replacement kit cover the original footprint of the Gainsborough 3000 mortice lock, but it also accommodates the space left by the old handles and cylinder.

This kit enables you to install an industry-standard mortice lock on your door, consistent with the rest of Australia. Parts for this standard-sized lock are readily available, and many manufacturers produce compatible components. For example, you can use Lockwood or KABA handles interchangeably, and swap Lockwood cylinders for Brava cylinders, all compatible with this lock.

This kit is essential for locksmiths to stock. It allows the removal of the old Gainsborough 3000 mortice lock and installation of the new lock in under 15 minutes, providing a fully functional, secure door that meets industry standards without the difficulty of sourcing discontinued Gainsborough locks.

This kit is available in two function options:

Option 1: Storeroom Function – The outside door handle is always locked and requires a key to open. The inside handle is always free to exit, allowing you to close the door behind you without using a key. Not suitable if the door has two locks, such as a deadlatch lock above the mortice lock (e.g., Lockwood 001).

Option 2: Classroom Function – The outside door handle can be locked or unlocked with a key. You can leave the lock unlocked for frequent access and use the key to lock it from the outside when needed. This function is more suitable if a deadlatch (Lockwood 001) is also installed on the door.

Key Features

• Replaces Gainsborough 3000, 3400, and 3500 mortice locks
• Fire-rated mortice lock with 4-hour certification
• Stainless steel lock body and plates for durability and weather resistance
• Available in Storeroom or Classroom functions
• Suitable for left or right-handed doors
• Compatible with inward and outward opening doors
• Saves time and cost by avoiding door replacement
• Complete kit with all necessary parts included
• Conversion template provided for easy installation
• Easy change of lock functions via dial on lock body (compatible with LOCKTON 23mm & 30mm backset mortice locks)
• Kick-off function included
• Accepts Australian oval cylinders
• Easy close action compatible with electric strikes
• Uses industry-standard cams
• Cycle tested for durability
• Fits doors 32-50 mm thick
• Electric strike compatible

Technical Specifications

Fire Rating: 4 hours when installed in accordance with the manufacturer’s instructions in a new, compliant fire door. Where this lock is retrofitted or adapted to replace an existing lock, such as a Gainsborough 3400 mortice lock, the modified installation has not been fire tested. Therefore, the lock’s 4-hour fire rating does not apply to or certify the adapted installation.

Ideal Applications

This replacement kit is ideal for locksmiths, handymen, and building managers who need a reliable, cost-effective solution to replace discontinued Gainsborough 3000 series mortice locks. It is suitable for commercial and residential fire doors requiring a fire-rated lock, and for doors where maintaining the original lock footprint is essential. The kit supports compatibility with a variety of Australian standard handles and cylinders, making it a versatile choice for retrofitting and repairs.

The 60mm mortice lock body and latch are manufactured from 304 stainless steel, ensuring exceptional toughness, durability, and resistance to harsh Australian weather conditions.

The kit includes all necessary fixing screws, strikes, cylinder retaining pins, turn snib adapter, templates, and clear installation instructions.

If installing on a fire door, please consult your local fire inspector to confirm compliance with regional requirements.

SL8: Physical Security Rating (Mortice Lock Body)

D8: Durability Rating (500,000 Cycles) (Mortice Lock Body)

Sc8: Cylinder Security Rating (Mortice Lock Body)

Design for Access and Mobility: This product complies with the Disability Access requirements of AS1428.1-2009