Fullex MK1 2 Point Sliding Patio Door Lock – Pin on Frame – 18.75mm / 25.75mm / 28.75mm Backset
Fullex MK1 2 Point Sliding Patio Door Lock – Pin on Frame
Direct like-for-like replacement for older Fullex-fitted uPVC, aluminium, and timber sliding patio doors. Available in 18.75mm, 25.75mm, and 28.75mm backsets.
⚠ Discontinued by Manufacturer — This lock is no longer produced by Fullex (UAP Limited). No like-for-like alternative exists. All remaining stock is residual. Once current supplies are exhausted, this lock will be permanently unavailable.
Product Description
The Fullex MK1 2-point inline sliding patio door lock (Pin on Frame) is the original mechanism fitted to thousands of uPVC and aluminium sliding patio doors across the UK and Ireland, particularly in properties built during the late 1990s and 2000s. This listing is for the Pin on Frame (MK1) version, where the spring-loaded push pin is mounted in the fixed outer door frame.
When the sliding door is pushed fully closed, the lock body depresses the frame-mounted pin, enabling the lever handle to operate. Lifting the handle extends two round-headed locking bolts through the faceplate into keeps on the fixed frame. Turning the euro cylinder then deadlocks the mechanism, securing the door.
Three backset sizes are available — 18.75mm, 25.75mm, and 28.75mm — measured from the front edge of the faceplate to the centre of the euro cylinder keyhole. Select the backset that matches your existing lock precisely. Some older locks may be labelled 19mm, 26mm, or 29mm — these are the same sizes rounded.
What's Included
This listing is for the lock gearbox unit only. The following items are NOT included and must be re-used from your existing installation or purchased separately:
- Dome-headed screw bolts (locking pins)
- Faceplate
- Keeps / strikers
- Patio lever handles (must accept 5mm square spindle)
- Euro profile cylinder
Technical Specifications
| Specification | Detail |
|---|---|
| Brand | Fullex (UAP Limited) |
| Lock Type | Inline 2-point sliding patio door lock |
| Pin Position | Pin on Frame (MK1) |
| Backset Options | 18.75mm / 25.75mm / 28.75mm |
| Overall Cylinder Case Width | 34.75mm (18.75) / 41.75mm (25.75) / 44.75mm (28.75) |
| Locking Points | 2 (round-headed bolts) |
| Between Locking Points | 202mm CRS |
| Overall Length | ≈452mm |
| PZ Centres | 52mm (spindle to cylinder) |
| Spindle | 5mm square |
| Plunger | 15mm |
| Faceplate Width | 19mm |
| Lower Case Height | 94mm |
| Lower Case Depth | 42mm |
| Handing | Universal (non-handed) |
| Cylinder Type | Euro profile (not included) |
| Door Types | Sliding patio doors — uPVC, aluminium, timber |
| Manufacturer Status | Discontinued |
| Country of Origin | United Kingdom |
| Included | Lock gearbox unit only |
Backset Quick Reference
Use either the backset (faceplate edge to cylinder centre) or the overall cylinder case width (faceplate edge to back of case) to confirm your variant:
| Backset | Overall Case Width | Often Labelled As |
|---|---|---|
| 18.75mm | 34.75mm | ~19mm |
| 25.75mm | 41.75mm | ~26mm |
| 28.75mm | 44.75mm | ~29mm |
How to Identify Your Lock
Step 1 — Confirm Pin on Frame (MK1)
Open your sliding patio door. If the spring-loaded push pin is mounted in the fixed outer door frame (not on the lock body in the sliding panel), you have Pin on Frame (MK1) and this is the correct listing. If the pin is on the lock body, you need our MK2 Pin on Lock listing instead.
Step 2 — Measure the Backset
Measure from the front edge of the faceplate to the centre of the euro cylinder keyhole. Your measurement should be close to 18.75mm, 25.75mm, or 28.75mm. Alternatively, measure the full width of the case at the cylinder area (faceplate edge to back of case) and match against the overall widths above.
Step 3 — Check the Faceplate
Confirm your faceplate width is 19mm. If it is 22mm or wider, you may have a different Fullex patio lock variant.
Step 4 — Confirm PZ Centres
Measure from the centre of the square spindle hole to the centre of the euro cylinder keyhole. This should be approximately 52mm.
Before You Buy — Checklist
☐ I have confirmed the push pin is on the fixed frame (Pin on Frame / MK1)
☐ I have measured my backset as 18.75mm, 25.75mm, or 28.75mm
☐ I have checked my faceplate width is 19mm
☐ I have confirmed my PZ centres are approximately 52mm
☐ I understand keeps, bolts, faceplate, handles, and cylinder are NOT included
☐ I understand my patio levers must accept a 5mm square spindle
If any measurements do not match, this is NOT the correct lock. Please contact us before ordering.
Also Known As
This lock is referred to across the market as: Fullex MK1 Patio Lock, Fullex PDL Patio Lock, Fullex PDL1 2 Point Patio Slider, Fullex Inline Patio Door Lock, Fullex 2PT Patio Lock, Fullex Sliding Patio Door Lock – Pin on Frame, Fullex 2 Point Patio Door Lock Pin on Frame, and Fullex Patio Lock MK1 2PT. All refer to this product family.
Compatibility
This lock is a direct like-for-like replacement for existing Fullex MK1 (Pin on Frame) 2-point inline patio door locks only. It is not a universal patio door lock and will not fit doors originally equipped with MK2 (Pin on Lock) mechanisms, 4-point locks, or locks from other manufacturers such as Cego, Regent, ERA, or Schlegel. Before ordering, confirm your existing lock is a Fullex inline patio lock with the push pin on the fixed frame, and that your backset and case dimensions match. If you are unsure, please contact us before purchasing.
Ordering the Right Part
We want to help you get the right lock first time. Because this product is discontinued and stock is limited, please use the measuring guide above and check all dimensions carefully before placing your order. If you are unsure, send us clear photos of your existing lock (front, side, and end views) along with your measurements and we will help identify the correct variant. Locks that have been fitted, marked, or damaged may not be eligible for return.
Frequently Asked Questions
Not sure which lock you need?
Send us photos and measurements of your existing lock and we'll help you find the right part. Contact us before ordering to avoid returns.
