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skip to Union 3R35 Deadlocking Latch

Union 3R35 Deadlocking Latch

£179.99

(£149.99 ex VAT)

sku: 3R35
  • Automatic deadlocking upon door closure for immediate security
  • Operated by key from both sides to withdraw the latchbolt
  • Internal lever handle provides quick egress functionality
  • Integrated snib allows for latch hold-back when required
  • High-security five-detainer mechanism resists manipulation
  • Lockable internal handle for additional security control
  • Can be modified for fire escape applications by disabling handle locking
  • Standard 8mm follower for compatibility with lever furniture

Union C Series Range of Non BS3621 mortice locks which can be keyed alike together.

Union 3G110 Deadlock - 73mm £ 125.99
Union 3K70 Sashlock £ 144
Union 3J60 Horizontal Sashlock £ 227.99
Union 3R35 Deadlocking Latch £ 179.99

Key Configuration

Finish

Handing

Keys Supplied: per lock ( total) total (unless ordering multiple groups)
Additional Keys are available below
Qty:

Shipping From:

When ordering multiple Keyed Alike locks, only 1 set of keys are provided as all additional locks are made to work from that key.

If ordering 4 or more keyed alike locks you can have them set up as different groups. If Required: Let us know the details in the "Specific Key Requirements" field above.

Each group of locks will then receive keys.

star Recommended
heavy-duty Heavy Duty
8/10 Security Rating

The Union 3R35 is a high-security deadlocking mortice nightlatch designed for use on timber doors where automatic locking is a priority. It utilises a sophisticated five-detainer mechanism, offering a higher degree of security than standard lever locks by providing increased resistance to picking and unauthorised manipulation.

This latch functions by automatically deadlocking the bolt once the door is closed, ensuring the property is secure without manual intervention. The latchbolt can be withdrawn via a key from either the external or internal side. Additionally, an internal lever handle allows for convenient exit. A key-controlled feature allows the internal handle to be secured, preventing it from being operated, which is useful in specific security environments.

  • Functionality: Automatic deadlocking with key operation from both sides.
  • Safety: Can be modified for fire escape use by removing the handle-locking facility.
  • Convenience: Includes a snib to hold the latchbolt back for periods of free access.
  • Compatibility: Features a standard 8mm follower suitable for most internal lever handles.

The Union 3R35 is typically installed as a primary locking point on entrance doors or as a replacement for existing mortice nightlatches in both residential and commercial settings. It is recommended for use where reliable, automatic deadlocking is required alongside flexible internal access control.

Dimensions Image: Union 3R35 Deadlocking Latch
Part Size (mm)
centres 56
Backset 50
Bolt Length 10
Case Width 80
Case Height 148
Forend Width 25
Forend Length 200
Strike Plate Width 29
Strike Plate Length 178
Dimensions Image: Union 3R35 Deadlocking Latch

Brand

SKU

3R35

Box Contents

strike plate

fixing screws

instructions

mortice lock

FAQs

From the outside, the latchbolt is withdrawn using a key. From the inside, it can be operated by either a key or a lever handle. The door is designed to automatically deadlock whenever it is closed for enhanced security.

Yes, the Union 3R35 can be modified for use as a fire escape lock. This is achieved by removing the facility to lock the internal handle, ensuring it remains operable for emergency exits.

This mortice nightlatch includes an integrated snib. This function allows you to hold the latchbolt back, keeping the door ajar and allowing for unrestricted passage when needed.

The lock features a high-security 5-detainer mechanism and an 8mm follower. It is supplied with two keys and a silver case, with a choice of two forend finishes:

  • Brass
  • Satin Chrome

Related Products

skip to Extra Key for Union 3R35 Locks

Extra Key for Union 3R35 Locks

£4.80

(£4.00 ex VAT)

sku: EXCHK
  • Specifically designed for compatibility with Union 3R35 mortice deadlock mechanisms
  • Functions as a precise replacement or additional spare key
  • Manufactured to original equipment manufacturer (OEM) specifications for reliable operation
  • Suitable for high-security 5-detainer lock configurations
  • Precision-engineered to ensure smooth engagement with internal lever systems
  • Ideal for maintaining secure access in domestic and commercial premises
Qty:

Shipping From:

When ordering multiple Keyed Alike locks, only 1 set of keys are provided as all additional locks are made to work from that key.

If ordering 4 or more keyed alike locks you can have them set up as different groups. If Required: Let us know the details in the "Specific Key Requirements" field above.

Each group of locks will then receive keys.

The Union 3R35 Replacement Key is designed specifically for use with the Union (formerly Chubb) 3R35 series of mortice deadlocks. These locks are widely utilised in both residential and commercial settings to provide high-level security for external doors. This key serves as an essential component for property owners needing to increase the number of available keys or replace worn or lost originals.

Precision-engineered to match the exact requirements of the 3R35's 5-detainer mechanism, the key ensures smooth rotation and reliable engagement with the bolt work. By using a key designed to the original manufacturer's tolerances, the risk of internal wear on the lock mechanism is significantly reduced compared to generic alternatives.

  • Compatibility: Exclusively for Union 3R35 and legacy Chubb 3R35 mortice deadlocks.
  • Application: Suitable for timber doors where 3R35 deadlocks are installed for primary security.
  • Function: Provides a direct interface with the internal lever pack to throw or retract the deadbolt.
skip to Internal Handle for Union 3R35

Internal Handle for Union 3R35

£118.80

(£99.00 ex VAT)

sku: 3R35H
  • Specifically designed for compatibility with Union 3R35 mortice locks
  • Features an integrated snib to facilitate the latch hold-back function
  • Engineered to prevent the handle mechanism from fouling the internal lockcase
  • Incorporates a standard Euro profile cylinder cut-out for key access
  • Lever handle design provides ergonomic operation of the latch mechanism
  • Provided as a complete internal furniture set including the backplate
  • Surface-mounted design with pre-drilled holes for straightforward installation
Qty:

Shipping From:

When ordering multiple Keyed Alike locks, only 1 set of keys are provided as all additional locks are made to work from that key.

If ordering 4 or more keyed alike locks you can have them set up as different groups. If Required: Let us know the details in the "Specific Key Requirements" field above.

Each group of locks will then receive keys.

The Union 3R35 Internal Handle is a specialised piece of door furniture designed to work seamlessly with the 3R35 lock series. Unlike standard lever handles, this unit is engineered with specific offsets and internal clearances to ensure that the handle operation does not interfere with the lockcase mechanism.

This handle is essential for applications requiring the latch hold-back feature. It includes a dedicated integrated snib located on the backplate, which allows the user to engage the latch in a retracted position when required. This functionality is typical for internal doors where temporary free passage is needed without the latch engaging.

Suitable for use on timber doors, the backplate includes a pre-cut profile aperture to accommodate a locking cylinder. It serves as an essential component for both new installations and as a direct replacement for worn or damaged internal furniture where specific lockcase compatibility is required. The design ensures that all internal moving parts align correctly with the 3R35 series' unique internal configuration.

Brand

SKU

3R35H

Box Contents

handles

skip to Handle Set for Union 3R35 | Satin Chrome Finish

Handle Set for Union 3R35 | Satin Chrome Finish

£67.20

(£56.00 ex VAT)

sku: L16105
  • Designed specifically for use with the Union 3R35 mortice lock
  • Features an integrated snib to hold the latch in the retracted position
  • Engineered to prevent the lever mechanism from fouling the lockcase
  • Supplied as a complete set for internal and external application
  • Direct replacement for original Union 3R35 hardware
  • Maintains the full functionality of the latch and locking system
Qty:

Shipping From:

When ordering multiple Keyed Alike locks, only 1 set of keys are provided as all additional locks are made to work from that key.

If ordering 4 or more keyed alike locks you can have them set up as different groups. If Required: Let us know the details in the "Specific Key Requirements" field above.

Each group of locks will then receive keys.

The Union 3R35 Handle Set is a purpose-designed hardware solution specifically engineered for compatibility with the Union 3R35 mortice lock. Due to the unique configuration of the 3R35 lockcase, standard lever handles often foul the mechanism; this dedicated set features the necessary offset to ensure smooth, unobstructed operation.

This handle set includes a functional integrated snib located on the backplate. This allows the user to hold the latch bolt in the retracted position, enabling free passage when security is not required. It is an essential component for both new installations and as a direct replacement for worn hardware on existing Union 3R35 systems.

  • Compatible exclusively with Union 3R35 series locks
  • Provides clearance for internal lock components
  • Suitable for timber doors in residential or commercial settings

Brand

SKU

L16105

Box Contents

handles