Fullex MK2 2 Point Sliding Patio Door Lock – Pin on Lock – 18.75mm / 25.75mm / 28.75mm Backset

Product Description

The Fullex MK2 2-point inline sliding patio door lock (Pin on Lock) 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 Lock (MK2) version, where the spring-loaded push pin is built into the lock case on the sliding door panel.

When the sliding door is pushed fully closed, the push pin on the lock body strikes a flat strikeplate on the fixed outer frame and depresses inward, 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 Lock (MK2)
Backset Options	18.75mm / 25.75mm / 28.75mm
Overall Cylinder Case Width	Verify from stock — may match MK1 widths
Locking Points	2 (round-headed bolts)
Between Locking Points	202mm CRS
Overall Length	≈482mm
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

Overall case widths shown are based on the MK1 (Pin on Frame) version. MK2 widths should be identical but please verify by measuring your existing lock.

How to Identify Your Lock

Before You Buy — Checklist

Also Known As

This lock is referred to across the market as:
Fullex MK2 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 Lock · Fullex 2 Point Patio Door Lock Pin on Lock · Fullex Patio Lock MK2 2PT.
All refer to this product family.

Compatibility

This lock is a direct like-for-like replacement for existing Fullex MK2 (Pin on Lock) 2-point inline patio door locks only. It is not a universal patio door lock and will not fit doors originally equipped with MK1 (Pin on Frame) 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 lock body, 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

What is the difference between Pin on Lock (MK2) and Pin on Frame (MK1)?

Pin on Lock (MK2) has the spring-loaded push pin built into the lock case on the sliding door panel. Pin on Frame (MK1) has the push pin mounted in the fixed outer door frame. These are not interchangeable — you must match your existing configuration. This listing is for Pin on Lock (MK2) only.

How do I know if I have Pin on Lock (MK2)?

Open your sliding patio door and look at the edge of the lock body fitted in the sliding panel. If you can see a small spring-loaded push pin (plunger) protruding from the lock case, you have Pin on Lock (MK2) and this is the correct listing. If the push pin is mounted in the fixed outer frame instead, you have Pin on Frame (MK1) and need our MK1 listing.

How do I measure the backset on my Fullex patio lock?

Measure from the front edge of the faceplate to the centre of the euro cylinder keyhole. Use a ruler or digital callipers. Your measurement should match one of: 18.75mm, 25.75mm, or 28.75mm. Alternatively, measure the overall case width at the cylinder area (faceplate edge to back of case) and compare against the quick reference table above. Some older locks may be labelled 19mm, 26mm, or 29mm — these are the same sizes rounded.

Is this lock still manufactured?

No. This lock has been discontinued by Fullex (UAP Limited) and is no longer in production. There is no like-for-like replacement from any manufacturer. All remaining stock is residual — once current supplies are exhausted, this lock will be permanently unavailable.

What is included with this lock?

This listing is for the lock gearbox unit only. Dome-headed screw bolts, faceplate, keeps/strikers, patio lever handles, and euro profile cylinder are NOT included. You must re-use your existing hardware or purchase these separately.

Will this lock fit my patio door?

This lock is a direct like-for-like replacement for doors originally fitted with a Fullex MK2 (Pin on Lock) inline patio door lock. It will not fit doors with MK1 (Pin on Frame) mechanisms or locks from other manufacturers. You must match your pin position, backset, and case dimensions before ordering. If in doubt, contact us with photos and we will help.

What spindle size does this lock use?

This lock uses a 5mm square spindle, which is smaller than modern multipoint locks (typically 7mm or 8mm). Ensure your existing patio lever handles are compatible with a 5mm spindle.

Is this lock handed (left or right)?

No, this lock is universal (non-handed) and can be fitted to both left and right sliding patio doors.

What does "overall cylinder case width" mean?

The overall cylinder case width is the full width of the lock case at the euro cylinder area, measured from the front edge of the faceplate to the back of the case body. This is often easier to measure than the backset (which goes to the cylinder centre rather than the back edge) and can help confirm you have the correct variant.