How to Measure a Tubular Latch: A Comprehensive Guide from T.H. Wiggans Ironmongery Ltd

At T.H. Wiggans Ironmongery Ltd in Kendal, we pride ourselves on being the leading supplier of architectural ironmongery, doors, hardware, fixings, and adhesives since 1976. Located in the scenic gateway to the Lake District, our showroom boasts over 1000 door handles and more than 40 internal doors on display. Whether you're a tradesperson, an architect, or a DIY enthusiast looking to upgrade your home, this guide on how to measure a tubular latch is designed to help you make informed decisions.

Correctly measuring a tubular latch ensures that you purchase the right replacement part, which is crucial for the functionality and aesthetics of your doors. An ill-fitting latch can cause operational issues and potentially damage your door, making accurate measurement essential.

• Tape measure
• Screwdriver
• Pen and paper (for notes)

The backset is the distance from the edge of the door to the centre of the latch. This measurement determines how far your handles will be from the edge of the door when fitted.

• Tip: Use a tape measure to measure from the edge of the door to the centre of the hole where the latch is fitted.
• Common Backsets : 64mm (2 1/2"), 78mm (3"), 104mm (4"), 129mm (5"), and 150mm (6").

Example: If you measure the distance from the door edge to the centre of the latch hole and find it to be 64mm, you will need a latch with a 64mm backset.

The case depth is the distance from the front of the faceplate to the back of the latch case. This determines how much of the door you will need to cut out to fit your latch.

• Tip: Measure from the front of the latch to the back of the lock case.
• Important: Some doors, especially glazed or panelled ones, may not have enough space for longer latches.

Example: If your case depth measures 78mm, ensure that your door can accommodate this depth without compromising its integrity.

The forend is the plate that covers your latch and sits in the middle of the door. Accurate measurement ensures you won't need to adjust the existing cut-out in the door.

• Tip: Measure the length and width of the forend.

Example: A standard forend size might be 25mm by 57mm. Ensure your replacement latch has the same forend size to avoid modifications.

The handing of the latch determines which way it will open. At T.H. Wiggans Ironmongery, all our tubular latches are fully reversible, so you don't need to worry about handling when purchasing from us.

We stock a wide range of tubular latches with various body lengths, including:

• 64mm (2 1/2"): Commonly used with handles on backplates.
• 78mm (3"): Typically used with door handles on a rose.
• 104mm (4"), 129mm (5"), and 150mm (6"): Usually used with mortice knobs to move the knob away from the door casing.
• Legg 3724 Locking Tubular Latch: A non-standard size of 3 3/4", available in brass and nickel-plated finishes, traditionally used with a snib to lock the latch.

• Inspect Your Door: Ensure the door is free from damage and has enough material to accommodate the new latch.
• Gather Tools: Have all necessary tools on hand, including a drill, screwdriver, and chisel.

1. Mark the Door: Use a pencil to mark the centre of the latch hole and the outline of the faceplate.
2. Drill the Latch Hole: Drill the hole for the latch body, ensuring it is straight and at the correct depth.
3. Chisel the Faceplate Recess: Carefully chisel out the marked area for the faceplate, ensuring a snug fit.
4. Insert the Latch: Place the latch into the hole and secure it with screws.
5. Attach the Forend: Position the forend over the latch and secure it with screws.
6. Fit the Handles: Attach the handles or knobs, ensuring they operate the latch smoothly.

• Check for Wear and Tear: Regularly inspect the latch for signs of wear and tear, such as loose screws or a sticking mechanism.
• Lubricate Moving Parts: Use a suitable lubricant to keep the latch operating smoothly.

• Sticking Latch: If the latch sticks, remove it and clean any debris. Lubricate the mechanism before re-installing.
• Loose Handle: Tighten any loose screws on the handle to ensure it operates correctly.

• Expertise: With over four decades of experience, we are experts in the field of ironmongery.
• Quality Products: We offer high-quality products from leading suppliers.
• Local Presence: Based in Kendal, Cumbria, we understand the needs of local tradespeople and homeowners.
• Customer Service: Our knowledgeable staff is always ready to assist you with any queries.

"I've been using T.H. Wiggans for years. Their range of tubular latches and other hardware is unmatched. The staff are knowledgeable and always ready to help."

"I recently renovated my home and bought all my door handles and latches from T.H. Wiggans. The quality is excellent, and their guide on how to measure a tubular latch was incredibly helpful."

Accurately measuring a tubular latch is crucial for ensuring a proper fit and smooth operation of your door hardware. By following the steps outlined in this guide, you can confidently measure and select the right tubular latch for your needs. Visit T.H. Wiggans Ironmongery Ltd in Kendal for all your architectural ironmongery needs, and benefit from our extensive range and expert advice.

For more detailed guidance, check out our how-to-fit a tubular latch guide here.