An EN72NL night latch mortise lock order should define the lock case, lever set and Euro profile cylinder together. For door manufacturers and hardware importers, the main selection points are the required entry function, backset, 72 mm centres, follower size and cylinder fit through the finished door and furniture.
TOPTEK’s EN72NL family includes five backset models. Selecting the exact model first gives the door hardware manufacturer a common dimensional reference for the case, handle and cylinder. This helps prevent a correctly supplied component from becoming the wrong part for the assembled door.
Select the EN72NL lock case
The EN72NL night latch mortise lock uses a handle and cylinder to operate the latch. Specify the intended night-latch arrangement as outside key entry and inside lever operation, and select outside furniture that preserves that arrangement.
| Model | Backset | Handle to cylinder centres |
|---|---|---|
| EN5572NL | 55 mm | 72 mm |
| EN6072NL | 60 mm | 72 mm |
| EN6572NL | 65 mm | 72 mm |
| EN7072NL | 70 mm | 72 mm |
| EN8072NL | 80 mm | 72 mm |
Use backset to locate the handle and cylinder relative to the door edge. Use the 72 mm centre distance to position the furniture openings. These dimensions answer different questions; matching one does not compensate for a mismatch in the other.
Match the follower and lever spindle
EN72NL is specified with an 8 × 8 mm or 9 × 9 mm follower opening. State the selected version in the order and match the lever spindle to it. A handle’s appearance or standard designation does not establish this fit.
For plate furniture, check the 72 mm handle-to-cylinder spacing and the fixing layout. For separate roses and escutcheons, check each fixing against the lock case and door preparation. Agree the inside and outside operating arrangement with the furniture supplier so an active outside lever does not change the intended key-entry function.
The lock also uses a 235 mm forend with specified widths of 20, 22, 23 or 24 mm and round or square ends. Include the selected width and end shape when ordering for a prepared door. The wider TOPTEK European mortise lock range includes other functions; use the NL model when the schedule calls for this latch operation.
Size the Euro cylinder against the finished assembly
Record the cylinder lengths on each side of its fixing datum, including the finished furniture thickness. Confirm the cam and its engagement with the selected case. A total door-thickness figure alone cannot describe an asymmetric cylinder position or different furniture thicknesses on the two faces.
TOPTEK’s construction cylinder range provides a starting point for the keying and cylinder enquiry. Identify the required key arrangement and quantity alongside the dimensions, rather than leaving the cylinder to a separate order with no door reference.
Keep the supporting documents tied to the components
The Intertek certificate numbered 2649-CPR-26002201, issued on 4 June 2026, lists the five NL models above and their backsets. It describes the night-latch function as handle-operated and cylinder-operated latching. Request the current applicable copy through TOPTEK’s certification resources for the model being specified.
That lock-case document does not by itself establish the performance of every lever, cylinder or complete door assembly. Include any project-specific handle, cylinder and doorset requirements in the same enquiry, so the supplied documents correspond to the components actually ordered.
Request an EN72NL hardware set quotation
Send TOPTEK the door section and hardware schedule with the NL model, follower size, furniture arrangement, cylinder side lengths, keying requirement and quantities. Identify which components should be included. A single configuration record gives the sample review and subsequent orders the same reference.
Frequently Asked Questions
Are all EN72NL backsets available with 72 mm centres?
The listed EN5572NL, EN6072NL, EN6572NL, EN7072NL and EN8072NL models have 55, 60, 65, 70 and 80 mm backsets respectively, with 72 mm centres.
Can any Euro profile cylinder be used with EN72NL?
The profile alone is insufficient. Confirm the cam, operating function and cylinder lengths on both sides against the selected lock case and finished furniture.
Does the lock-case certificate cover the whole hardware set?
Do not extend the lock-case certificate to every handle, cylinder or doorset. Match the documentation to each supplied component and the project’s assembly requirements.