What is meant by 'Backset'?

What is backset on a lock or latch

'Backset' is the distance from the front of the lock to the centre of the spindle as shown here.

If you intend to use new locks or latches on an old door, replacing your old ones, you will need to make sure the new one fits into the hole in the door.  To do this, measure the 'backset' distance of your old lock.  Check the other dimensions too, most of our pages show plate and lock case dimensions.

Almost ALL domestic mortice locks and tubular latches are supplied with either a 44mm or 57mm backset length.  These equate to case sizes of 2.1/2" or 3" in imperial measurements.

Commercial (DIN) lockcases are 60mm backset.  

If you are not sure what you need, then drop us an email with a photo, or phone in to chat it through.

For more help and information please contact us at help@doorstuff.co.uk

Featured Products

ERA Fortress BS Rated 5 lever Deadlock

Model: ERA mortice deadlock case BS3621
Application: External security doors
Size: 64mm (2.1/2") & 76mm (3")
British Standard: BS 3621:2007
Finish: Satin chrome & polished brass

This ERA Fortress 5 lever British Standard high security mortice deadlock to BS3621:2007 meets the exacting demands of insurance companies and the police.  Higher security levels are delivered by a 20mm bolt and hardened steel plates to resist drilling. 

Heavy duty 10 year guarantee

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ERA Fortress BS Rated 5 lever Sashlock

Model: ERA mortice sashlock case BS3621
Application: External security doors
Size: 64mm (2.1/2") & 76mm (3")
British Standard: BS 3621:2007
Finish: Satin chrome & polished brass

This ERA Fortress 5 lever British Standard high security mortice sashlock to BS3621:2007 meets the exacting demands of insurance companies and the police.  Higher security levels are delivered by a 20mm bolt and hardened steel plates to resist drilling. 

Heavy duty 10 year guarantee

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Imperial G4050 Heavy duty small case latch

Model: Imperial G4050 Heavy duty small case latch
Application: Internal latching doors
Case Size: 76mm (3") - 57mm backset
Fire rated: Yes
Finish: Satin stainless steel

Manufactured in Britain by Imperial Locks of Willenhall to EN12209, the G4050 small case mortice latch is designed for heavy duty use in a commercial or public environments such as schools, hospitals and public buildings.

The dimensions of the lock case assist in fulfilling requirements and duties required under the Equality Act by satisfying the recommendations of BS 8300 2009 and Approved Document M 2015 (2016) Certifire approved: CF5543 An explanation of product classification with reference to heavy duty mortice locks 5 year guarantee

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Hoppe ARRONE AR8006 small case euro deadlock

Model: Hoppe ARRONE AR8006 small case euro deadlock
Application: Internal independently locking doors
Case Size: 76mm (3") - 57mm backset
Fire rated: Yes
Finish: Satin stainless steel

The Hoppe small case deadlock is ideal for locking off plant, riser, and cleaners cupboard doors to maintain security and the building fire strategy.  Complies with EN12209.  Where used on fire doors these doors may not need door closers if a "Fire Door Keep Locked" sign is also displayed.

The dimensions of the lock case assist in fulfilling requirements and duties required under the Equality Act by satisfying the recommendations of BS 8300 2009 and Approved Document M 2015 (2016) Certifire approved: CF5543 An explanation of product classification with reference to heavy duty mortice locks 5 year guarantee

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UNION HD72LA Heavy Duty Mortice Latch

UNION HD72LA Heavy duty large case mortice latch

Model: UNION HD72LA Heavy duty large case mortice latch
Application: Internal non-locking doors with handles
Size: 80mm (3 1/8") - 60mm backset
Fire rated: Yes
Finish: Satin stainless steel

The UNION modular 72mm centres DIN latch case complies with BE EN12209:2003.  Designed for heavy duty use in a commercial or public environment such as schools, hospitals and public buildings.  The modular case allows easy substitution with the other UNION HD series lock cases allowing the use of the door to be changed with the minimum of carpentry.

The dimensions of the lock case assist in fulfilling requirements and duties required under the Equality Act by satisfying the recommendations of BS 8300 2009 and Approved Document M 2015 (2016) Certifire approved: CF5543 An explanation of product classification with reference to heavy duty mortice locks 15 year guarantee

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UNION HD72SL Heavy duty euro mortice sashlock

Model: UNION HD72SL Heavy duty euro sashlock case
Application: Internal locking doors with handles
Size: 80mm (3 1/8") - 60mm backset
Fire rated: Yes
Finish: Satin stainless steel

The UNION modular 72mm centres DIN sashlock case complies with BE EN12209:2003.  Designed for heavy duty use in a commercial or public environment such as schools, hospitals and public buildings.  The modular case allows easy substitution with the other UNION HD series lock cases allowing the use of the door to be changed with the minimum of carpentry.

The dimensions of the lock case assist in fulfilling requirements and duties required under the Equality Act by satisfying the recommendations of BS 8300 2009 and Approved Document M 2015 (2016) Certifire approved: CF5543 An explanation of product classification with reference to heavy duty mortice locks 15 year guarantee

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UNION HD72DL Heavy duty euro mortice deadlock

Model: UNION HD72SL Heavy duty euro deadlock case
Application: Internal locking doors without handles
Size: 80mm (3 1/8") - 60mm backset
Fire rated: Yes
Finish: Satin stainless steel

The UNION modular 72mm centres DIN deadlock case complies with BE EN12209:2003.  Designed for heavy duty use in a commercial or public environment such as schools, hospitals and public buildings.  The modular case allows easy substitution with the other UNION HD series lock cases allowing the use of the door to be changed with the minimum of carpentry.

The dimensions of the lock case assist in fulfilling requirements and duties required under the Equality Act by satisfying the recommendations of BS 8300 2009 and Approved Document M 2015 (2016) Certifire approved: CF5543 An explanation of product classification with reference to heavy duty mortice locks 15 year guarantee

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UNION HD72WC Heavy duty euro mortice bathroom lock

Model: UNION HD72WC Heavy duty bathroom lock case
Application: Internal locking bathroom doors
Size: 80mm (3 1/8") - 60mm backset
Fire rated: Yes
Finish: Satin stainless steel

The UNION modular 72mm centres DIN sashlock case complies with BE EN12209:2003.  Designed for heavy duty use in a commercial or public environment such as schools, hospitals and public buildings.  The modular case allows easy substitution with the other UNION HD series lock cases allowing the use of the door to be changed with the minimum of carpentry.  Suitable for 5mm or 8mm square indicator spindles.

The dimensions of the lock case assist in fulfilling requirements and duties required under the Equality Act by satisfying the recommendations of BS 8300 2009 and Approved Document M 2015 (2016) Certifire approved: CF5543 An explanation of product classification with reference to heavy duty mortice locks 15 year guarantee

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UNION HD72ESL Heavy duty euro escape mortice sashlock

Model: UNION HD72ESL Heavy duty euro emergency escape sashlock case
Application: Internal locking doors with handles
Size: 80mm (3 1/8") - 60mm backset
Fire rated: Yes
Finish: Satin stainless steel

The UNION modular 72mm centres DIN emergency escape sashlock case complies with BE EN12209:2003.  Designed for heavy duty use in a commercial or public environment such as schools, hospitals and public buildings.  The modular case allows easy substitution with the other UNION HD series lock cases allowing the use of the door to be changed with the minimum of carpentry.

The dimensions of the lock case assist in fulfilling requirements and duties required under the Equality Act by satisfying the recommendations of BS 8300 2009 and Approved Document M 2015 (2016) Certifire approved: CF5543 An explanation of product classification with reference to heavy duty mortice locks 15 year guarantee

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UNION HD72DNL Heavy duty euro profile deadlocking nightlatch

Model: UNION HD72DNL Heavy duty euro profile deadlocking nightlatch 
Application: Free egress doors with key entry
Size: 80mm (3 1/8") - 60mm backset
Fire rated: Yes
Finish: Satin stainless steel

The UNION modular 72mm centres DIN euro profile deadlocking nightlatch case complies with BE EN12209:2003.  Designed for heavy duty use in a commercial or public environment such as schools, hospitals and public buildings.  The modular case allows easy substitution with the other UNION HD series lock cases allowing the use of the door to be changed with the minimum of carpentry.

The dimensions of the lock case assist in fulfilling requirements and duties required under the Equality Act by satisfying the recommendations of BS 8300 2009 and Approved Document M 2015 (2016) Certifire approved: CF5543 An explanation of product classification with reference to heavy duty mortice locks 15 year guarantee

More Info Prices / Buy
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