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From The Anvil Heavy Duty Latch - 4 Inch - Bronze

From The Anvil Heavy Duty Latch - 4 Inch - Bronze

The From The Anvil 4 inch heavy duty tubular mortice latch is engineered with an extra strong spri...

Best current price£12.48from B&Q

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Product Information

Full details

The From The Anvil 4 Inch Heavy Duty Tubular Mortice Latch is an ideal choice for homeowners and contractors seeking a robust, reliable latch mechanism for doors fitted with knob sets or unsprung lever handles. Its extra-strong spring ensures smooth operation even with heavy door furniture, though its 82mm backset requires careful measurement of your door frame and handle positioning prior to installation.

All features

ColourBronze
Model Part Number51759
BrandFrom The Anvil

Extended Product Information

FAQs

Is this latch suitable for fire doors?

Yes, this product is CERTIFIRE approved for use on FD-20, FD-30, and FD-60 fire doors.

Can I use this with any lever handle?

It is specifically designed for unsprung lever handles or knob sets, though it works well with most standard handles as long as the 82mm backset suits your door preparation.

What is the backset size?

The backset for this particular model is 82mm.

Does it come with fixing screws?

Yes, the product includes the necessary screws for standard installation.

Can this be used on external doors?

While durable, this is a tubular mortice latch designed primarily for internal use; check your specific door security requirements for external applications.

What standards does it meet?

It is tested to BS EN12209:2003 and carries UKCA and CE markings.

Troubleshooting

Latch bolt fails to retract fully

Check that the faceplate is recessed deep enough and that the mortice cavity is free of debris.

Handle is stiff or difficult to turn

Ensure the spindle is not too long, causing it to bind against the back of the latch mechanism.

Handle sagging

Verify the latch is correctly aligned with the handle and that the springs in the handle are not fighting the latch spring.

Pros and Cons

Pros

  • High-quality, durable construction for long-term use
  • Suitable for high-traffic or heavy-duty door environments
  • Certified for fire safety applications
  • Compatible with both knobs and lever handles
  • Bolt-through design allows for secure handle mounting

Cons

  • Larger 82mm backset may not fit all existing door cutouts
  • Requires professional routing tools for flush installation
  • Not intended for lightweight doors where spring resistance might be excessive

Setup, Compatibility & Care

To install this latch, ensure your door has sufficient thickness to accommodate the 4-inch case. You will need to use a router or sharp chisel to create a clean mortice in the door edge. Ensure the faceplate is flush with the edge of the door for smooth latch operation. For maintenance, a light application of silicone-based lubricant to the latch bolt once every six months is recommended to ensure the internal spring remains quiet and smooth. Periodically check the fixings of your door handles to ensure they remain tight, as vibration over time can loosen the connection between the handle and the latch casing.

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