How to measure the throw of a gate lock

two hands holding calipers measuring latch bolt

Security is a main reason to install a gate and the lock is naturally a big part of that. It is therefore important to make sure the lock latches and locks properly without any issues. Measuring the throw of the lock should be an important step when finding your next gate lock.

We’ve therefore made an overview of the latch and deadbolt lengths of our bolt-on lock ranges the Superlock and the Select Pro.

The different measurements

You might think it would be as easy as giving a single dimension for the throw of a gate lock, but it isn’t quite as simple as that. We get asked about a variety of different dimensions when it comes to the latch and deadbolts. Please see below for the description of each dimension on the below drawing.

 

Dimension A shows the dimension from the front of the lock and through the gate frame when the lock isn’t used (resting). The latch bolts are adjustable so there will be a minimum and a maximum measurement for these.

 

Dimension B is the latching movement. This is how much the latch retracts when the handle is operated, pulling the latch back.

 

Dimension C is the extending deadlocking movement, which only applies to the locks that can be deadbolted extra. When turning the key to deadlock the gate, the deadbolt will extend this much into the gate post.

dimensional drawing of latch length and measure throw on bolt on deadlock

 

 

 

 

 

 

 

 

 

Dimension explainer:
A = How far the locking bolt protrudes from the lock in its standard resting position
B = Latching (retracting) movement
C = Deadlocking (extending) movement
Ø = Diameter of the locking bolt


Latch lengths for 10-30mm gate frame bolt-on locks

Product A – length, min A – length, max B – latching movement C – deadlock movement
Superlock BLD 27 mm 53 mm 15 mm 15 mm
Superlock BD 15 mm 43 mm N/A 15 mm
Superlock BDG 27 mm 53 mm 15 mm N/A
Superlock BDGS 27 mm 53 mm 15 mm N/A
Superlock BQK 27 mm 53 mm 15 mm N/A
Superlock BQDG 27 mm 53 mm 15 mm N/A
Select Pro SBD 11 mm 38 mm N/A 30 mm
Select Pro SBLD 26 mm 54 mm 13 mm 30 mm
Select Pro SBKLLT 34 mm 62 mm 20 mm N/A
Select Pro SBL 22 mm 54 mm 13 mm N/A
Select Pro DGL 35 mm 65 mm 22 mm N/A
Select Pro DGLS 35 mm 65 mm 22 mm N/A
Select Pro SBQEDGL 35 mm 65 mm 22 mm N/A
Select Pro SBQEKL 35 mm 65 mm 22 mm N/A

Latch lengths for 40-60mm gate frame bolt-on locks

Product A – length, min A – length, max B – latching movement C – deadlock movement
Superlock BLD 57 mm 83 mm 15 mm 15 mm
Superlock BD 45 mm 73 mm N/A 15 mm
Superlock BDG 58 mm 84 mm 15 mm N/A
Superlock BDGS 58 mm 84 mm 15 mm N/A
Superlock BQK 58 mm 84 mm 15 mm N/A
Superlock BQDG 58 mm 84 mm 15 mm N/A
Select Pro SBD 40 mm 68 mm N/A 30 mm
Select Pro SBLD 58 mm 86 mm 13 mm 30 mm
Select Pro SBKLLT 68 mm 95 mm 20 mm N/A
Select Pro SBL 60 mm 86 mm 13 mm N/A
Select Pro DGL 68 mm 95 mm 22 mm N/A
Select Pro DGLS 68 mm 95 mm 22 mm N/A
Select Pro SBQEDGL 68 mm 95 mm 22 mm N/A
Select Pro SBQEKL 68 mm 95 mm 22 mm N/A

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