Betley Butterfly 3 Lever Mortice Sash Lock - Black

The Betley Butterfly 3 Lever Mortice Sash Lock is designed for reliable security across domestic, ...

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B&QB&Q - 3 Lever Mortice Brass Sash Lock Key 2.5" 64mm Bolt Through Reversable Bathroom Handle Locks
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Product Information

Full details

The Betley Butterfly 3 Lever Mortice Sash Lock is an ideal security solution for homeowners and facility managers seeking a reliable, sleek fastening mechanism for domestic, industrial, or commercial doors. It provides robust protection for interior doors, gates, sheds, and garages, though its 3-lever configuration is best suited for low-to-medium security requirements rather than high-security external front doors.

All features

ColourBlack
BrandBetley Butterfly

Extended Product Information

FAQs

Can this lock be used on an external front door?

While it can be used on side gates or garages, it is not recommended for main entrance doors as 3-lever locks provide less security than the 5-lever locks typically required by insurance providers.

Is the latch reversible?

Yes, the latch tongue is reversible, allowing you to easily swap it to match the handing of your specific door.

What is the spindle size?

The lock features a standard 57mm spindle hole spacing.

Does this lock come with handles?

No, this product includes the sash lock mechanism, keys, and plates only. Handles must be purchased separately.

How do I maintain the black finish?

Clean with a soft, dry cloth. Avoid harsh chemicals or abrasive sponges, as these can strip the finish.

Troubleshooting

The latch does not retract fully when the handle is turned.

Ensure the handle spindle is aligned correctly and that there is no debris inside the mortice hole restricting the movement.

The key feels stiff when locking or unlocking.

Check that the door is properly aligned with the strike plate; if the door is sagging, the bolt may be rubbing against the frame, requiring a hinge adjustment.

The lock does not fit the door thickness.

Ensure your door is thick enough to house the 13mm deep lock body while maintaining structural integrity on both sides of the mortice.

Pros and Cons

Pros

  • Versatile design suitable for internal and external utility doors
  • Easy to install due to the reversible latch functionality
  • Sleek black finish matches modern hardware trends
  • Comprehensive kit includes all necessary mounting hardware

Cons

  • 3-lever mechanism offers lower security compared to 5-lever British Standard locks
  • Not intended for high-security exterior entrance doors
  • Requires professional routing into the door edge for a flush fit

Setup, Compatibility & Care

To install this lock, you must cut a mortice into the edge of your door that accommodates the 65mm x 108mm x 13mm body. Ensure that your door handle set is compatible with the 57mm spindle hole alignment. Always dry-fit the lock body before driving in the included fixing screws to ensure the latch moves freely without binding. To maintain the finish, simply wipe the forend plate with a soft, dry cloth; avoid using abrasive chemicals or metal polishes, as these may damage the black coating. If the mechanism becomes stiff over time, a tiny amount of dry lubricant spray into the keyhole and latch bolt can restore smooth operation.

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