How To Fit A Tubular Latch

Published: | Last Reviewed:

Author: Carl Benson

Carl is the founder of Suffolk Latch Company, with a background in engineering and around 20 years’ experience in architectural ironmongery. He works with suppliers and manufacturers on the company’s hardware range. Read my full bio.

Carl Benson

Introduction

To fit a tubular latch, mark the door, prepare a mortice for the latch body, drill the spindle clearance holes, recess the faceplate and align the striker plate on the frame. Check the mechanism with the door open before testing it closed.

This guide explains how to fit a tubular latch using our original carpenter-led video. The demonstration uses a heavy-duty latch: the initial drilled opening must be squared out with a chisel to accommodate its body.

Watch the Fitting Video

Follow the carpenter through marking out, drilling, chiselling and fitting the latch and striker plate.

Video chapters: these links open the original video on YouTube.

Before You Start

Check that the latch suits the door and its handle or knob. For selection advice, read Tubular Latch Sizes: How to Choose the Right Latch.

For a replacement, compare the existing mortice, spindle position and faceplate recess with the new latch before cutting. If they already match, new drilling may be unnecessary.

Our tubular latches collection includes 3-inch and 4-inch heavy-duty latches. Use the dimensions for your chosen product; case length determines the space needed inside the door.

Antique brass heavy duty 3 inch tubular latch

Satin brass heavy duty 3 inch tubular latch

Scope: this guide covers a suitable, non-fire-rated internal timber door. For fire doors, follow the approved door and hardware specification and use a competent installer. Fire Door Safety Week explains these requirements.

Tools Needed

  • Pencil, tape measure, set square and marking knife.
  • Drill, suitable timber bits, pilot drill and screwdriver.
  • Sharp chisels, mallet, secure door support and eye protection.

In this demonstration, the 20 mm bit makes the initial door-edge bore and the 10 mm bit makes the spindle clearance holes. These are demonstration sizes, not universal specifications. Use a countersink bit only where the fixing arrangement requires clearance beneath the plate.

Step-by-Step Fitting Instructions

1. Mark the latch and spindle positions

Start with accurate marks on the edge and both faces of the door. The latch body and spindle must line up with one another, so check these positions carefully before you begin drilling.

Secure the door open. Decide the handle height and use a set square to carry a level reference line across the door edge and onto both faces. Mark the centre of the door’s thickness on its edge.

Mark the spindle centre on each face using the latch’s specified backset. Both marks must align. If needed, check our backset measuring guide before drilling.

2. Drill the initial hole into the door edge

Mark the required boring depth on the drill bit or use a depth stop. Allow for the latch body and any clearance specified in its instructions.

Using the larger bit, drill into the door edge at the marked centre. Keep the drill level and aligned with the door. Withdraw it periodically to clear shavings. The round bore is the starting opening, not the finished mortice.

3. Square out the mortice for the latch body

The drilled hole is only the starting point for this heavy-duty latch. Chisel the opening into a rectangular mortice to suit the body, then cut a separate shallow recess for the faceplate.

Mark the rectangular opening needed for the heavy-duty latch body, keeping it centred on the bore. With a sharp chisel, remove small amounts of timber around the opening and along the mortice until its shape accommodates the case.

Clear loose shavings and trial-fit the latch. It should slide into position without being hammered or pulled in with its screws. Keep your supporting hand behind the cutting edge.

4. Drill the spindle clearance holes

Remove the latch before drilling. Using the smaller bit, drill from each marked door face into the prepared mortice. Working from both sides helps prevent timber breaking out on the opposite face.

These holes provide clearance for the square spindle, also called the mortice bar. They are separate from any handle fixing holes.

5. Recess the faceplate and secure the latch

Insert the latch, hold its faceplate square and mark its outline and fixing holes. Remove it, drill suitable pilot holes and carefully score the outline with a marking knife.

Chisel a shallow recess to the faceplate’s thickness, checking frequently until it sits flush. This recess is separate from the deeper mortice for the body.

Check that the bevelled latch bolt faces the striker plate as the door closes. If reversal is needed, follow that model’s instructions. Refit the latch and tighten its screws without distorting the plate.

6. Fit the handle and test with the door open

Test the handle and latch with the door open before you close it. Once the mechanism moves freely, check that the bolt enters the striker plate without needing to lift, slam or force the door.

Pass the correct spindle through the latch and fit the compatible handle or knob to its instructions. Check spindle engagement and fixing positions. For bolt-through furniture, see how to fit a bolt-through door handle.

Operate the furniture from both sides with the door open. The bolt must retract freely and return when released. Correct any stiffness before closing the door. Check the fixing details for your chosen handle in our Door Handles collection.

7. Mark the striker plate position

Bring the door towards the frame and transfer the latch position onto it. Hold the striker plate in place so its opening aligns with the bolt and its lip receives the bevel as the door closes.

Check the position against the door stop, then mark the fixing holes and plate outline.

8. Prepare the frame recess and bolt pocket

Remove the striker plate. Drill suitable pilot holes, score its outline and chisel a shallow recess so the plate sits flush.

Within the plate opening, cut a separate pocket deep enough for the bolt to enter freely. Remove only the timber needed for the plate, bolt and any supplied keep box.

9. Fix the striker plate and test the door

Clear the recess and screw the striker plate into place. Close the door gently and check that the latch engages without lifting, slamming or forcing it. Open it from both sides and repeat the test.

If it works freely when open but catches when closed, check strike alignment and pocket clearance first. Do not enlarge the recess until you have identified the contact point.

Matt black 4 inch heavy duty tubular latch

Matt gun metal 4 inch heavy duty tubular latch

Conclusion

Accurate marking and gradual chiselling help the latch sit correctly. Keep the body mortice, spindle holes and faceplate recess distinct, then align the striker plate. Finish by checking operation with the door both open and closed.

Standard matt black 4 inch tubular latch

Adjustable roller catch matt black 4 inch

Frequently Asked Questions

What size drill bits are used in this demonstration?

A 20 mm bit starts the door-edge opening, which is then squared out for the heavy-duty latch body. A 10 mm bit makes the spindle clearance holes. Other latches may require different preparation.

Can every tubular latch be reversed?

No. Reversal depends on the mechanism. Follow the instructions for your latch and do not force or dismantle it using a method intended for another model.

Should the latch faceplate sit flush?

For the recessed fitting described here, yes. Cut the shallow recess to the faceplate’s thickness and check the fit before final tightening.

Why does the latch catch after fitting?

Possible causes include strike misalignment, insufficient pocket clearance or binding around the latch or spindle. Compare operation with the door open and closed before removing more timber.

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