WhichOne › DIY store & garden › home security system › home security › locking system › door lock › auxiliary lock

The best auxiliary locks in comparison

Guaranteed independent and reliable
Millions of satisfied users every year
Last updated on 05.07.2025

Filter

Sort

Brand:Reduced items only:

Best choice

Loboo Idea HUK Tubular Lock Pick Set Und 7 Pin übungsschloss Tubular Lock for Für Anfänger Und Profi-schlosser, Schlüsseldienst Werkzeug Set Für Schlüsseldienst, Lockpicking Tubular Dietrich Set

Loboo Idea

6% off

free shipping

9,9

Check price

Show on Amazon

show more show less

Features

Loboo Idea 7 Pin Tubular lock pick, This package Contains 3 Pieces Locksmith Practice Openers -(7.00mm ,7.5mm, 7.8mm) and 8 piece auxiliary means, a Visible 7 Pins Tubular Training Lock.
The Transparent Lock is a Great Way of Helping People Understand What's Going on Inside, This tubular transparent lock is the same as the real tubular lock , you can try and test the real ones after you practise this sucessfully.
Good to Learn How to do Something New.This Set is the Most Popular Set that We Have.
Special Scalloped 7 pin design relief for added strength, can fit for most of Locks.
Also a great gift for kids to develop thire intelligence, but to make sure they can play them accompanied with old pperson.

£ 25.49

£ 39.08

Defender Security U 11315 Swing Bar Door Guard with High Security Auxiliary Lock, Brass Finish, 1-Pack, 1 Pack

Defender Security

9,8

Offer ends in:

23hours

45minutes

40seconds

Check price

Show on Amazon

show more show less

Features

EMERGENCY BREAKAWAY In case of emergency, the thumb turn will breakaway with approximately 100 lbs. of force.
EASY INSTALLATION Installation is quick and easy, and all fasteners are included extra security and peace of mind can be achieved in just minutes!
THUMB TURN LOCK The additional thumb turn security lock blocks the release tool from disengaging the door guard latch.

£ 14.80

£ 22.64

PRIME-LINE U 11317 Swing Bar Door Guard with High Security Auxiliary Lock, Classic Bronze Finish, 1-Pack, 1 Pack

Prime-Line

9,7

Check price

Show on Amazon

show more show less

Features

Comes in a beautiful, corrosion resistant, classic bronze plated finish
3-7 8 inch bar length x 2-1 2 inch height, and 2-9 32 inch backset
Durable zinc diecast construction can be used on various hinged doors where increased security is desired
Allows ventilation while securing door

£ 16.32

£ 25.16

Concealed Hinge Jig, 35MM Stainless Steel Hinge Drilling Jig Hole Saw Jig Drilling Guide Locator Hole Opener Door Cabinets DIY Tool for Face Frame Cabinet Cupboard Door Hinges Inset

CDIYTOOL

8% off

free shipping

9,4

Check price

Show on Amazon

show more show less

Features

Durable Material Made of high quality aluminum alloy, precision manufacturing, accurate positioning, convenient operation. The Concealed Hinge Jig allows you to drill cup holes for concealed cabinet door hinges, great for boring concealed hinges and door locks.
Adjustable The drill guide is adjustable to tension wooden boards of different thicknesses. It is a great tool kit for furniture factory and woodworking fans. 35mm hinge opening installation, door hinge punching positioning, woodworking hole opening auxiliary tool.
Easy to Use Install a 35mm hole opener, adjust the drilling depth to 12-13MM normally, and then lock the limit ring. Simple to use with any drill?no special tools needed.
Application Suitable for drill press, pistol drill, bench drill, vertical drilling machine, hand held electric drill, stand motor-driven drilling machine and mobile ribbon type magnetism drilling machine etc.
FULL SET 35mm Hinge Drilling Jig comes with a 35mm fastener bit and depth stop; Easy to install, assemble, and remove with great convenience

ZAMETTER Invisible Door Lock/hidden Lock/indoor Door Lock/auxiliary Lock/zinc Alloy Invisible Auxiliary Door Lock(gold)

free shipping

9,3

Check price

Show on Amazon

show more show less

Features

Convenient Locking Mechanism Features a thickened anti-theft solid lock that can be easily locked or unlocked with an external key or an internal rotary button, providing you with flexible security options.
Easy Installation Designed for simplicity, this internal door lock can be installed effortlessly without the need for professional assistance, saving you time and effort.
Versatile Usage Suitable for various environments including home doors, hotels, and offices. Its versatile design ensures it fits seamlessly into any setting, enhancing security where you need it most.
Stylish Design Options Available in three elegant colors - yellow bronze, black, and gold - to complement your decor. Please CHECK YOUR DOOR WIDTH is greater than 35mm for proper fit.

MTQY 6PCS 22mm Black Door Lock Dust Cover Rubber Waterproof Key Panel Cam Lock Dust Cover for Auxiliary Door Lock

MTQY

free shipping

9,3

Check price

Show on Amazon

show more show less

Features

Colour black, material rubber, matching lock diameter 22mm 0.87inch, inside length 22mm 0.87inch, size 35x38mm 1.4x1.5inch(diameter x high), packing list 6pcs cam lock dust covers
Advantages rubber waterproof material has good corrosion resistance, abrasion resistance, oil resistance, durability, good flexibility, in the temperature change or structural deformation can still maintain the elasticity and waterproof effect.
Purpose The door lock dust cover is used as an auxiliary door lock with the function of waterproof, rainproof and dustproof to prevent it from being worn out by the outside world or aging due to man-made scratches.
Instructions for use Clean the surface of the lock first, make sure there is no dust, oil or other debris, then cover the dust cover.
Note Please check the size before placing an order.

Siemens – Block/Lock Auxiliary Contact 71E 4 A

9,2

Check price

Show on Amazon

Hasaller Invisible Door Lock Concealed Security Auxiliary Lock Zinc Alloy Invisible Door Locks Concealed Latch Lock Indoor Auxiliary Lock with Key for Indoor Doors Home Hotel Office(Brushed color)

Hasaller

free shipping

9,2

Check price

Show on Amazon

show more show less

Features

SIZING REMINDER Please check your door specifications to ensure compatibility before purchasing.
WIDELY APPLICABLE Suitable for various environments including homes, hotels, and offices, providing security solutions wherever needed.

Recommendation

Siemens Sirius – Lock Auxiliary Contact 3 Na + 1NC Size S00 Borne Spring

9,2

Check price

Show on Amazon

show more show less

Features

Number of normally open contacts 3
Type of electric connection spring connection

Siemens – Block/Lock Auxiliary Contact 22E 4 A

9,2

Check price

Show on Amazon

show more show less

Features

Rated operation current ie with AC 230 V 4 a
Design of electric connection mm Screw connection

This ranking is created through algorithmic analysis of millions of products tailored specifically to your search. We aim to find the most suitable product for you based on manufacturer information and price. The ranking reflects our opinion and should serve as a good starting point for your purchase. We would like to point out that we have not tested the products ourselves and link to selected online shops and partners from which we may receive compensation.

You might also be interested in these auxiliary locks.

Zoegneer Single Cylinder Deadbolt Invisible Door Lock Zinc Alloy Invisible Exit Square Door Lock Bedroom Passage Auxiliary Lock Door (Square Black)

Convenient Accessibility With its key lock feature, you can easily access or restrict entry to a space. The invisible access adds a touch of sophistication while maintaining functionality.

free shipping

Check price

Siemens Sirius – Lock Auxiliary Contact 2 NA + 2NC Size s00-s0 Borne Screw

Design of the electrical connection spring connection

Check price

NUOBESTY Hidden Door Deadbolt Lock Modern Single Cylinder Auxiliary Lock for Thick Doors Sleek Secure and Elegant Design for Enhanced Interior Security and Minimalist Style

Stylish functionality singlesided deadbolt with a copper core iron key, combining style and functionality for secure locking,commercial door lock,single cylinder entry lock

free shipping

Check price

4-Digit Padlock Minami Combination Lock Padlock Security Item 4-Digit Locker Warehouse Gate Auxiliary Lock

Product Specifications Material Zinc alloy; Color Black; Size Approx. 83 x 55 x 26 mm 3.3 x 2.2 x 1.0 inch; Package Weight Approx. 295g.

free shipping

Check price

Invisible Door_Concealed Lock, Indoor Door_Lock, Auxiliary_Lock With Key,Internal Door Lock Auxiliary Lock(Bronze)

ZINC ALLOY CONSTRUCTION This invisible door lock is crafted from high-quality zinc alloy, long-lasting durability and reliability. Its robust design provides enhanced security for your home, office, or hotel room, giving you peace of mind.

Check price

Stainless Steel Door Lock, Single-sided Door Lock, Indoor Door Lock Auxiliary Lock, Invisible Door Single Cylinder Deadbolt With Key(copper)

Sturdy and Reliable Made of stainless steel materials, this door lock with key ensures durability and reliability. You can purchase with confidence, knowing it will provide long-lasting security for your doors.

free shipping

Check price

Siemens Sirius – Lock Auxiliary Contact 2 NA + 2NC Size s00-s0 Borne Screw

SIEMENS

Check price

TOUGH MASTER Hammer Drill 650W Variable Speed 13mm Metal Chuck, 2 in 1 Corded Electric Hammer Drill Function for Concrete Steel Wood with Auxiliary Handle Included

FORWARD AND REVERSE SWITCH Forward and reverse switch with automatic spindle lock for safe use meets your every need for screwing tasks. Simply push the forward & reverse switch to the middle position of the handle, it will lock the screwdriver

~~£ 31.99~~ free shipping

Check price

POPETPOP Hidden Door Lock Modern Single Cylinder Auxiliary Security Lock for Interior Doors Finish Enhanced Protection for Home and Office

Invisible design the lock's invisible design enhances the aesthetic appeal of your home, offering a sleek and sophisticated look while remaining discreet,hidden door hardware,door deadbolt lock

free shipping

Check price

Alanmoship Invisible Door Lock Concealed Auxiliary Lock Indoor Security Latch with Key for Home Hotel Office Zinc Alloy Single-Sided Anti-Theft Rotary Button Easy Install(Bronze)

SIZING CAUTION Please check that your door width exceeds 35mm to ensures compatibility.

free shipping

Check price

ZAMETTER Door Locks, Concealed Locks, Indoor Door Locks, Auxiliary Locks Black Door Lock With Brushed Nickel Handles

Smooth and Comfortable With meticulous processing, the lines and of this door lock are smooth, providing a comfortable touch and ease of use.

Check price

Round Pocket Door Lock, Zinc Alloy Invisible Door Locks Concealed Latch Lock Indoor Auxiliary Lock with Key for Home Hotels Offices (Bronze)

No complicated steps required; the straightforward installation process allows you to secure your doors in no time at all.

free shipping

Check price

The best auxiliary locks in comparison

Guaranteed independent and reliable

Features

Features

Features

Features

Features

Features

Features

Features

Features

You might also be interested in these auxiliary locks.

Our offer