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Union C-Series - BS3621 2007 Sashlock (UN 3K74-E)

From £86.77 excl. VAT

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A very good quality, insurance graded sashlock.

Please note; this is a 5 Lever BS3621 insurance graded lock

This sashlock is up to the new European standards; British Standard 3621 2007. Comprising a 20mm “throw” on the anti-saw bolt, hardplate and anti-pick levers, this sashlock is suitable for use on any external door.

These sashlocks have standard 57mm centres (the measurement from the centre of the spindle to the centre of the keyway) and so are compatible with the complete range of lever on plate door handles.

Using a roller bolt rather than a conventional latch, these sashlocks have a nice smooth action, with less wear over time on the strike plate.

These locks used to be sold as Chubb locks, but are now manufactured under the name Union C-Series. This is because Assa Abloy (the owners of the Chubb, Yale and Union brands) no longer produce any locks under the Chubb name. They are the same locks, made by the same people in the same factories and so will fit as an exact replacement for the old Chubb 3K74 range.

Please remember to check the “backset” size when ordering. This is the distance from the edge of the door to the centre of the keyway.

If you are purchasing this lock to replace another, please be aware that this lock only has the same backset as the Chubb 3K and Union C-Series range of locks. This is slightly different to most other ranges of mortice locks.





Case Size





67 x 108mm    

153 x 25mm




80 x 108mm

153 x 25mm

Set Items

Each Sashlock Set Contains:
1 x 5 Lever Sashlock
1 x Strike Plate (Frame Side)
1 x Cover Plate for Lock
2 x Keys
Fixing Screws

Lead Times & Delivery

Please note, we usually have these sashlocks dispatched within three working days.
If you would like to check stock levels before ordering, please mail us at the email address below.

We are happy to export orders outside of the UK. Please mail us at the email address below and we will send you a quote with estimated lead time: