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skip to Union 3K74E Sashlock (BS3621:2007)

Union 3K74E Sashlock (BS3621:2007)

£70.79

(£58.99 ex VAT)

sku: CH3K74E

Manufactured to the same high security specification as 3G114E, the 3K74E is Unions top of the line sashlock. It contains a 2-bolt lock combining a key operated deadlock with a roller latchbolt. Designed primarily for securing front, rear and side entrance wooden doors, the roller latchbolt can be operated by lever handles on Manufactured to the same high security specification as 3G114E, the 3K74E is Unions top of the line sashlock. It contains a 2-bolt lock combining a key operated deadlock with a roller latchbolt. Designed primarily for securing front, rear and side entrance wooden doors, the roller latchbolt can be operated by lever handles on both sides of the door. Tested and certified to British Standard (BS3621:2007) and after a wide range of installations our team of Master Locksmiths highly recommend this lock due to its solid build quality and performance.

Mechanism: 5 Lever
Security Level: British Standard - BS3621:2007
Case Size: 67mm or 80mm
Case Finish: Silver
Forend Finish: Polished Brass or Satin Chrome
Keys Supplied: 3
Differs: 1000 +
Handling: Reversible

Document Icon product info

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

Union 3G114E Deadlock (BS3621:2007) £ 56.39
Union 3K74E Sashlock (BS3621:2007) £ 70.79

Case Size

Finish

Key Configuration

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
10/10 Security Rating
british-standard British Standard - BS3621
tick Key Profile: Standard
Dimensions Image: Union 3K74E Sashlock (BS3621:2007)
Part Min (mm) Max (mm)
centres 57 -
Backset 40 53
Bolt Length 20 -
Case Width 67 80
Case Height 108 -
Forend Width 25 -
Forend Length 153 -
Dimensions Image: Union 3K74E Sashlock (BS3621:2007)

Brand

SKU

CH3K74E

Box Contents

3 keys

strike plate

fixing screws

instructions

mortice lock

Certifications

british-standard British Standard - BS3621

Key Profile

Key Profile: Standard

FAQs

All the extra keys for the locks are cut to the specific locks that have been ordered.

There are 2 different sizes of lock cases as each lock will give you a different backset. This is the distance from the edge of the lock to the keyhole / spindle for handles. The bigger locks are better for solid wooden doors as they move the keyhole away from the door stop further. If you have a large door stop and fit a 64mm lock case you can find that you hit your knuckles on the door stop when you turn the key. Alternatively the 64mm lock case is better when you have a glass panelled door as you may not have enough wood on the stile to fit the 76mm lock into before you hit and therefore smash the glass. This is very important to check when installing locks to doors with glass in.

No, if the door is a communal entrance/ exit you MUST have a turn on the inside, so a 5 lever key on the inside is not suitable.

There are specific locks we sell called Egress locks that meet both the Insurance and Fire regulations so these are suitable for communal entrance doors.

To meet the fire regulations you need to be able to exit a communal door without the use of a key. If you are using the lock on your personal front door then they are fine but if others use the door you need to look into getting a turn knob internally so you can exit without the use of a key.

With outward opening doors you can not get a BS3621 outward opening nightlatch (see our section for all the options we have available) but if you install a standard security nightlatch you can also fit a BS3621 deadlock to the door which will give you the insurance rated lock required. As the deadlocks are not handed you can use them on any type of wooden door.

With most locks that are altered to make them keyed alike you will only get 1 x set of keys with them. So if the locks normally come with 2 you will only get 2 keys total and if they come with 3 keys you will only get 3 x keys total when ordered keyed alike.

Yes you can, we would need a key back as we dont hold any records of your keys but this is possible. Please get in touch first so we can confirm everything is ok to do and then you can post your key back to us (taped to a piece of card...essential!!)

Yes, this is possible but it is important to make sure you select the same brand and model. The internals and the keys need to match so we can key the locks alike.

We do try to list the products together in our series tab on the product page which should show the suitable products that can be keyed alike together.

If in doubt please ask us and we will let you know.

A rebate set is only required on double rebated doors. If you only have a single door then you will receive all the parts you require with the lock. If you need a rebate set you will need to check the size of your rebate. The most common is 13mm but on older doors they can be 19mm or 25mm.

With the 5 lever locks they are designed to be high security so there are thousands of different keys so the keys do not come with numbers on. Therefore we can not cut additional keys for these locks without a key to copy from. If you post it back to us we can do it for you (please contact us first before you send it) or alternatively nearly all the keys we sell are available from local locksmiths in your area. They maybe more expensive so we would recommend buying the extra keys at the time of purchase so we can cut and try them before we ship the order.

Sashlocks are typically suitable for both left- and right-handed doors, as well as inward- and outward-opening applications. They are designed to be reversible on site, making installation flexible and straightforward.

Depending on the brand and model, latch reversal can be done in one of two ways:

  • Pull and twist the latch bolt to the desired position

  • Remove a retaining screw on the back of the lock case, rotate the latch, then refit the screw

This allows for easy adjustment during installation without the need for specialized tools.

Yes, the Union 3K74E is tested and certified to British Standard BS3621:2007. This high-security rating is the standard requirement for most insurance companies regarding external wooden doors.

No, this lock features a reversible roller latchbolt. This unique design allows the lock to function perfectly on both left-handed and right-handed opening doors without any complex manual adjustments.

The Union 3K74E Sashlock is supplied with three keys as standard. It features a 5-lever mechanism with over 1,000 key differs to ensure high levels of security and pick resistance.

Yes, this is a sashlock designed specifically to be used in conjunction with lever handles. The roller latchbolt holds the door shut on a day-to-day basis, while the 5-lever deadlock provides maximum security when locked with a key.

Related Products

skip to Union 5 lever locks Extra Key (Chubb 114 Style)

Union 5 lever locks Extra Key (Chubb 114 Style)

£3.60

(£3.00 ex VAT)

sku: UNION-EXK-114
  • Compatible with Union 5-lever mortice locks built on the Chubb 114 style
  • Supplied as a precision-cut key for immediate use with specific lock mechanisms
  • Essential for providing additional access points for residential or commercial properties
  • Designed to ensure smooth mechanical operation within high-security lever assemblies
  • Constructed for long-term durability and reliable performance
  • Suitable for use as a replacement key or an additional spare

Keys Supplied: per lock ( total) total (unless ordering multiple groups)
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 5-lever Extra Key is specifically engineered to operate Union mortice locks that utilise the traditional Chubb 114 style architecture. These keys are a vital component for maintaining the security and accessibility of a property, ensuring that users have reliable access to their locking systems.

Typically used for both domestic and commercial timber doors, these keys are precision-cut to match the specific internal lever configurations of the lock. This ensures a high degree of accuracy during the unlocking process, which helps to prevent unnecessary wear on the internal lock components. Whether you are installing a new lock and require additional sets for multiple residents, or need a replacement for a misplaced key, these units provide the necessary compatibility for 5-lever security systems.

As these keys are built upon the established Chubb 114 design, they offer a proven mechanical solution for high-security applications. They are intended for use in situations where a robust, dependable key is required to maintain the integrity of a mortice lock installation.

skip to UNION 13mm Rebate for 3K74E - 3K74 Sashlock

UNION 13mm Rebate for 3K74E - 3K74 Sashlock

£27.59

(£22.99 ex VAT)

sku: ChubbRebate
  • Enables fitting of mortice sashlocks to rebated double doors
  • Specifically designed for use with Union 3K74 and 3K74E models
  • Supports roller latchbolt function for both left and right-hand hanging
  • Ensures the lock mechanism and strike plate align correctly on overlapping stiles
  • Provides a flush, professional finish for double door sets
  • Robust design suitable for both residential and commercial applications

Finish

Keys Supplied: per lock ( total) total (unless ordering multiple groups)
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 Rebate Set is an essential accessory designed to facilitate the installation of 3K74 and 3K74E mortice sashlocks into timber double doors with a rebated meeting stile. This kit ensures that the lock and its strike plate are correctly aligned and recessed into the overlapping edges of the doors, maintaining both security and aesthetic appeal.

Typically used in residential and commercial environments, this rebate set is suitable for doors where one leaf overlaps the other. It is engineered to work in conjunction with the roller latchbolt feature of the 3K74 series, allowing for easy operation on doors hung on either the left or right hand without needing manual adjustment of the lock components.

  • Specifically tailored for Union 3K74 series sashlocks
  • Enables secure latching and locking on rebated timber doors
  • Simple to install as part of a new door setup or as a replacement part
skip to Suitable Size Drill Bits to fit Mortice Locks

Suitable Size Drill Bits to fit Mortice Locks

£11.99

(£9.99 ex VAT)

sku: MortTool
  • Designed specifically for the installation of mortice locks in timber doors
  • Includes flat wood bits for rapid and efficient boring of the lock case cavity
  • Features a pilot drill bit to ensure accurate alignment before main drilling
  • Compatible with all standard power drill chucks and bit holders
  • Essential toolkit for ensuring a professional fit for sashlocks and deadlocks
  • Suitable for use on both internal and external wooden door types
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 Mortice Lock Drill Bit Kit is a specialised set of tooling designed to facilitate the precise installation of mortice sashlocks and deadlocks. By providing the essential drill bit diameters required for standard lock bodies, this kit ensures that the mortice cavity is bored to the correct depth and width with minimal effort.

The kit features flat wood bits which are ideal for the rapid removal of material from timber door stiles. These bits are designed to create clean, straight holes that accommodate the lock case without causing splitting. The inclusion of a pilot bit allows for accurate marking and initial drilling, which is critical for maintaining the structural integrity of the door and ensuring the lock operates correctly.

Commonly used by joiners and locksmiths, this kit is suitable for both new door installations and when upgrading existing hardware. It is compatible with most standard power drills, making it a versatile tool for residential or commercial door preparation.

Brand

SKU

MortTool

Box Contents

1 x Black and Decker 18mm Flat wood bit (for main mortice hole)

1 x Black and Decker 10mm Flat wood bit (for Key Holes)

2 x Black and Decker 2.5mm drill (for pilot holes)

skip to Suitable Size Chisels to fit Mortice Locks

Suitable Size Chisels to fit Mortice Locks

£17.99

(£14.99 ex VAT)

sku: MortChis

This Chisel set will contain 1 of each of the sizes you will need to fit a mortice lock to a wooden door

Kit includes:

1 x Faithful 19mm Chisel

1 x Faithful 25mm Chisel

The Faithfull bevel edged chisel range are quality tools for professional work as well as DIY users. The blue PVC handles on these chisels are impact resistant and designed for use with a mallet, or an occasional hammer blow.

Each blade is manufactured from drop-forged chrome vanadium steel and is hardened and tempered to exacting standards, ensuring that the cutting edge remains sharper for longer. The bevelled edges make these chisels ideal for fine work and for cutting into tight corners.

All the chisels in this range are supplied with blade guards.

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.

Brand

SKU

MortChis

Box Contents

19mm Chisel

25mm Chisel

Blade Guards

skip to Complete Set of 4 Chisels by Blue Spot

Complete Set of 4 Chisels by Blue Spot

£16.79

(£13.99 ex VAT)

sku: BLChisSet
  • Hardened steel blades for enhanced durability and edge retention
  • Precision ground edges for accurate paring and cutting
  • Ergonomic grooved handles for improved grip and control
  • Bevel edge design suitable for reaching into restricted areas
  • Integrated hanging holes for convenient tool storage
  • Designed for general-purpose woodworking and joinery tasks
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 Blue Spot 4 Piece Wood Chisel Set is designed for a variety of woodworking tasks, ranging from fine paring to general-purpose shaping. Each chisel features a blade manufactured from hardened steel, providing the necessary strength to withstand repeated impact and maintain a sharp cutting edge over time.

These chisels are equipped with precision ground blades, ensuring accuracy during intricate joinery work. The handles are constructed from a durable plastic with a textured, grooved finish to provide a secure and comfortable grip, reducing the risk of slipping during use. Each handle also includes a hanging hole for efficient workshop organisation.

This set is an essential addition to any toolbox for tasks such as creating recesses for hinges, cleaning out mortises, or paring down timber. The bevelled edges allow for better access when working in tight corners or narrow joints, making them suitable for both DIY enthusiasts and tradespeople alike.

Dimensions Image: Complete Set of 4 Chisels by Blue Spot

Brand

SKU

BLChisSet

Box Contents

1 x 6mm Chisel

1 x 12mm Chisel

1 x 19mm Chisel

1 x 25mm Chisel

skip to Extra Long Key for Union 5 lever locks (extra 30MM)

Extra Long Key for Union 5 lever locks (extra 30MM)

£5.40

(£4.50 ex VAT)

sku: UNION-5L-EXLK
  • Extended length design for deeper door profiles
  • Fully compatible with Union 5-lever mortice locks
  • Precision-cut to specific lock requirements
  • Facilitates operation through thick doors or cladding
  • Ideal for deep-set locks and heavy timber door assemblies
  • Suitable as a replacement or additional system key

Keys Supplied: per lock ( total) total (unless ordering multiple groups)
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 Extra Long 5-Lever Mortice Key is specifically engineered for use with Union 5-lever locks where standard-length keys are insufficient. Providing an additional 30mm of length compared to standard keys, this component is essential for installations involving thick doors, external cladding, or deep-set mortice pockets.

These keys are typically utilised when a door's thickness or the presence of decorative panelling prevents a standard key from reaching and engaging with the lock mechanism correctly. They function as a direct functional replacement or as additional keys for existing 5-lever Union systems. By offering extended reach, they ensure smooth operation without the need for door modifications or shallow mortice cuts.

Compatibility is focused on Union brand 5-lever locks. These keys are supplied cut to specific lock codes, ensuring they are ready for immediate use and provide a secure, precise interface with the internal lever mechanism.

Brand

SKU

UNION-5L-EXLK

Box Contents

1 key