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From The Anvil Heavy Duty Latch - 4 Inch - Silver

From The Anvil Heavy Duty Latch - 4 Inch - Silver

This heavy duty tubular mortice latch features an extra strong spring, making it suitable for use ...

Best current price£12.48from B&Q

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B&QB&Q - Polished Nickel 3" Heavy Duty Latch
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Wayfair UKPolished Nickel 3" Heavy Duty Latch
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Cast In StylePolished Nickel Heavy Duty Latch
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Product Information

Full details

The From The Anvil Heavy Duty Tubular Mortice Latch is a high-performance door component designed for homeowners and contractors seeking a reliable mechanism for heavy-duty applications. Ideal for use with knob sets or unsprung lever handles, this latch offers exceptional durability thanks to its extra-strong spring system. While it provides robust functionality and fire safety, users should note that the 4-inch sizing requires a specific 82mm backset, which may not be compatible with all standard door preparations.

All features

ColourSilver
Model Part Number51756
BrandFrom The Anvil

Extended Product Information

FAQs

Is this latch suitable for external doors?

This is primarily an interior mortice latch; while durable, verify weather-exposure compatibility with your hardware provider.

Does this latch come with a strike plate?

Yes, it includes the necessary strike plate and fixing screws for standard installation.

Can this be used with sprung lever handles?

While intended for unsprung handles, it can be used with sprung handles, though the action will be quite firm due to the extra-strong spring.

What does an 82mm backset mean?

The backset is the distance from the edge of the door to the center of the spindle hole. An 82mm backset requires the handle to be positioned 82mm from the door edge.

Is it fire-rated for all door types?

It is tested for FD-20, FD-30, and FD-60 fire doors, covering most standard residential fire door applications.

Troubleshooting

Latch bolt does not retract fully

Check that the mortice depth is deep enough and that the latch is not being squeezed by a tight-fitting door frame.

Handle feels loose after installation

Ensure the through-bolts are tightened correctly; if the handle still moves, ensure the bolt-through screws are fully engaged with the latch casing.

Door does not latch shut

Verify the alignment of the strike plate on the door frame to ensure the bolt meets the strike aperture precisely.

Pros and Cons

Pros

  • High-tension spring ideal for heavy knob sets
  • Certified fire safety for FD-20 through FD-60 doors
  • Supports bolt-through handle fixings
  • Durable silver finish suitable for modern interiors
  • Complies with rigorous BS EN12209:2003 standards

Cons

  • Requires specific 82mm backset clearance
  • May not fit standard narrow-stile doors
  • Heavy spring tension might feel stiff for some users

Setup, Compatibility & Care

To install this latch, verify that your door thickness accommodates the 82mm backset. Use a mortice chisel to clean out the recess accurately, ensuring the latch plate sits flush with the door edge. When pairing with lever handles, utilize the bolt-through holes to fix the handles securely against each other through the latch body, preventing the handles from rotating or loosening over time.

For ongoing maintenance, keep the latch bolt clean and debris-free. If the spring action begins to feel stiff over years of use, a small drop of dry silicone lubricant applied to the latch bolt can restore smooth functionality. Do not use thick greases, which can attract dust and impede the latch mechanism.

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