- 3 Lever horizontal mortice sash lock
- Supplied with Florentine bronze (antique brass finish) forend and strike plates
- Large style lock case available in two sizes – 127mm (5 inches) or 152mm (6 inches) deep.
- Traditional horizontal style is ideal for mortice knobs as it places the knobs far away from the door frame.
- Horizontal locks were a traditional lock often found in period properties.
- Key hole is located to the side of door knobs rather than underneath.
- Key operated dead bolt.
- Bolt through lock (38mm bolt holes) to suit bolt together handles and mortice knobs.
Operation
- Latch is withdrawn via a mortice door knob or lever handle from either side of the door (handles sold separately).
- Two way action allows un-sprung door knobs to be turned either way to withdraw the latch mechanism and open the door.
- Deadbolt is locked and un-locked via the supplied cut keys.
- Key differed – if ordering more than one lock each lock will come with different keys. (Please contact us if you would like multiple locks under the same key).
FeaturesÂ
- Light to medium weight springing makes this lock ideal for use with door knobs.
- Two way action allows door knobs to be turned in both directions.
- Solid brass guided latch.
- Solid brass deadbolt with anti-saw rollers.
- Bolt through facility for bolt together fixing lever handles and accessories at 38mm centres.
- 8mm x 8mm spindle follower (to suit standard UK size spindles).
- Latch can be reversed on site without taking the lock case apart.
- Supplied with 2 keys.
- Reversible frame mounted strike plate.
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Security LevelÂ
- Medium security architectural range.
- Suitable for use on internal doors in residential or light commercial buildings.
- 3 lever cut keys made from zinc alloy..
Finish
- Florentine bronze – (antique brass finish).
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Alternative Finishes Available
- Satin stainless steel.
- Polished stainless steel.
- PVD brass.
Dimensions

Available in two sizes
- 43421.1 – 127mm (5 inch)
- 43421.2 – 152mm (6 inch)
| Â |
43421.1 |
43421.2 |
Dimension On Diagram |
|---|---|---|---|
| Overall Case Depth |
127mm |
152mm |
A |
| Backset (Distance To Centre Of Spindle Hole) |
101mm |
127mm |
B |
| Backset (Distance To Centre Of Key Hole) |
38mm |
50mm |
C |
| Case Height |
70mm |
70mm |
D |
| Forend – Height x Width |
120mm x 25mm |
120mm x 25mm |
E |
| Strike Plate – Height x Width |
140mm x 25mm |
140mm x 25mm |
F |
Options Available To Order
- Keyed alike – (please contact us if you would like a number of looks to operate under one key).
- Intumescent sheets and lock case liners are available. Please see our intumescent fire rated products category for details.
Unit Of Sale
- Each – (1 x lock case supplied with forend, strike plate and 2 keys).








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