Keys restricted by patent.
Mul-T-Lock has been a worldwide leader in manufacturing high security keys, cylinder locks and access control solutions for over 45 years, sold through a network of authorised and trained service centres.
Restricted key by patent
Mul-T-Lock's restricted keys by patent include the most sophisticated security features available. Used with Mul-T-Lock CLIQ electro-mechanical technology, a single restricted key can operate all of your Mul-T-Lock products.
Mul-T-Lock 3in1 key system
Mul-T-Lock keys include a special patented floating element to meet the highest security standards and provide enhanced key control for your business. This reliable double locking mechanism offers enhanced resistance to picking and drilling.
Good to know
Changeable combination
Users have full control over their ability to instantly change a cylinder lock combination. There is no need to wait for a professional to rekey in an emergency, and no re-keying labour or extra costs. The cylinder allows instant re-keying without removal or disassembly: simply insert and turn a key to permanently change the cylinder to a new combination.
Who needs Mul-T-Lock key duplication?
Mul-T-Lock key duplication is for sites that already run a restricted key system and need more keys: a new employee, a lost key or a second site. Because the keys are restricted, we cut them only on your authority.
Frequently asked questions
Why can’t any locksmith copy a Mul-T-Lock key?
The keys are restricted. MTL600 keys are protected by patent, and CLASSIC keys come with a coded key card, so they can only be duplicated through authorised Mul-T-Lock dealers.
What is the difference between MTL600 and CLASSIC keys?
CLASSIC is a high security mechanical platform with enhanced pick and drill resistance. Where higher security is needed, with features such as patented key control, we recommend MTL600.
Can one key open all my Mul-T-Lock products?
With the MTL600 platform, a single restricted key can operate all of your Mul-T-Lock products, including CLIQ electronic locks.
Need Mul-T-Lock key duplication?
We are an authorised Mul-T-Lock distributor, we can support your restricted keys or master key systems.
The Mul-T-Lock name, the muscleman logo, in the field of locking products, the MTL name, and any other name, mark, or logo used by Mul-T-Lock and marked by a ™ or ® sign, are registered / pending or otherwise owned trademarks of Mul-T-Lock Ltd. and/or its affiliates 2026 © ASSA ABLOY
