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Master Lock's TSA approved locks allow TSA staff to unlock and inspect luggage without cutting the lock open, ensuring headache-free travel. Shop now.

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Luggage Locks | Master Lock

Browse Master Lock's collection of bike locks and scooter locks, including cable, python and set-your-own combination locks. Shop now.

Bike Locks | Scooter Locks | Master Lock

Find what you need--product support, information, videos, Master Lock Vault app support and more. Learn more today.

Service and Support | Product Videos | Vault App Support | Master Lock

With 100 years of experience in protecting factories, stores, job sites, schools and other facilities, Master Lock specializes in protecting your business and personal property for your employees or clients.

Safes & Storage for Business Use

Protect your belongings from theft, fire or floods with a sturdy home safe. Shop now.

Safes & Storage | Master Lock

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Providing safety and security is part of running a business. Our products include locks for industrial spaces, lockers, storage units, toolboxes and more. Learn more today.

Locks for Business | Job Sites | Security | Master Lock

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Instruction videos

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Master Lock's outdoor padlocks can secure many aspects of your home and property. Shop now.

Outdoor Security Solutions | Master Lock

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Discover Master Lock’s innovative security products, including padlocks, combination locks, safes, and more.  Explore our solutions to protect your assets.

Master Lock EMEA | Security Products, Lock Boxes and Safes 

Locks are a necessary part of securing garages and cars, including straps and bungees. Shop now.

Auto & Garage Security | Master Lock

Key Safes

Locker Locks

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Master Lock has a wide array of locks to protect your home and property, indoor and outdoor. Shop now.

Locks to Secure Your Property | Master Lock

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Key Safes | Lock Box for Keys | Master Lock

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Multi-User Operating Instructions - 3670 / 3630 / 3631

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Keys & Combos

Video Library

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Become a distributor

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Secure all type of loads with Master Lock selection of straps and bungees.

Straps & Bungees

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Smart locks make it easier than ever to manage security, streamlining coming and going. Shop now.

Bluetooth & Electronic Locks | Smart Locks | Master Lock

Robust security solutions for businesses from Master Lock, featuring lockout/tagout, access control, and safety products to safeguard assets and employees.

Commercial & Business Security | Master Lock

Master Lock strives to provide products and solutions using the latest technology & innovation.

New Products

Master Lock strives to provide products and solutions using the latest technology & innovation. Access Control.

Bluetooth & Electronic Locks

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Locks By Use

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Locks By Type

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Smart Access Control

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Product Support

Business Support

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Learn where to buy the safety and security products you need, from consumer to professional product lines. Shop today. 

Where to Buy | Retail | Distributors | Master Lock

Multi-User Installation Instructions - 3670 / 3630 / 3631

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Master Lock can provide the best padlock for your needs--combination locks, gate locks, locker locks and more. Shop now.

Padlocks | Master Lock

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Multi-User Lock Success at Purdue University - Short Version

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Video library

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Millions of people trust Master Lock to secure their property every day. No matter what's important to you, you can count on us to protect it.

Locks for Personal Use

Product Compliance

Master Lock, world leader in locks, is recognized throughout the world for its quality products for the security of homes, bicycles, luggage ...

Cables & Chains

Browse bungees, cables and chains to supplement your security solutions tailored to a commercial environment. Shop now.

Other Security Devices for Business | Master Lock

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Master Lock, the worldwide leader in portable security products, continues to set the standard for quality and selection.

Custom Padlocks

Ensure workplace safety with Master Lock's comprehensive Lockout/Tagout solutions. Protect employees and maintain compliance with industry standards. Shop safety products today.

Lockout Tagout | Master Lock

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Master Lock empower businesses and individuals with the confidence needed to safeguard what they value most.

About Us

Meet The New Master Lock cloto™ Solution

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Reach out to Master Lock’s customer support team for assistance with products, orders, and general inquiries. Get started today.

Contact Master Lock | Customer Support & Assistance

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Multi-User Supervisory Override Key Instructions - 3670 / 3630 / 3631

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