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SSL Certs
Welcome to Masterlocks
View Cart
Master Lock and American Locks Only.
Customer Service:
1-800-778-2217
Advanced Search
SEARCH
------All Categories------
Made in the USA
AMERICAN PADLOCKS
MATCH MY KEY NUMBER
TOP SELLERS
FREE SHIPPING
SHOP BY BEST USE
SHOP BY BEST USE - ADA & Special Needs
SHOP BY BEST USE - ATVs & All Terrain Equipment
SHOP BY BEST USE - Automotive & Towing
SHOP BY BEST USE - Backpacks, Duffel Bags & Sports Bags
SHOP BY BEST USE - Bicycles
SHOP BY BEST USE - Briefcases & Computer Bags
SHOP BY BEST USE - Cabinets
SHOP BY BEST USE - Cash Handling & Document Storage
SHOP BY BEST USE - Construction Sites & Equipment
SHOP BY BEST USE - Entry Doors
SHOP BY BEST USE - Fences
SHOP BY BEST USE - Fire Equipment Housing & Cabinets
SHOP BY BEST USE - Golf & Outdoor Recreation
SHOP BY BEST USE - Grills & Lawnmowers
SHOP BY BEST USE - Guns, Hunting & Shooting Equipment
SHOP BY BEST USE - Indoor Storage Lockers
SHOP BY BEST USE - Industrial, Storefront & Business Gates
SHOP BY BEST USE - Jewelry & Curio Cabinets
SHOP BY BEST USE - Job Boxes & Gang Boxes
SHOP BY BEST USE - Key Safes
SHOP BY BEST USE - Laptop Computers
SHOP BY BEST USE - Luggage & Travel
SHOP BY BEST USE - Manufacturing Environments
SHOP BY BEST USE - Marine Recreation
SHOP BY BEST USE - Monitor
SHOP BY BEST USE - Motorcycles, Mopeds & Scooters
SHOP BY BEST USE - Office Environments & Equipment
SHOP BY BEST USE - Peripherals
SHOP BY BEST USE - Pickup Trucks
SHOP BY BEST USE - Portable Power Equipment
SHOP BY BEST USE - Projector
SHOP BY BEST USE - Refrigerators & Freezers
SHOP BY BEST USE - Residential Gates & Fences
SHOP BY BEST USE - School, Employee, & Athletic Lockers
SHOP BY BEST USE - Self Storage Units
SHOP BY BEST USE - Sheds, Workshops & Garages
SHOP BY BEST USE - Shut Off Valves
SHOP BY BEST USE - Sliding or Patio Doors
SHOP BY BEST USE - Snowmobiles, Skis, Skates & Winter Sports
SHOP BY BEST USE - Steering Wheels
SHOP BY BEST USE - Storage Lockers
SHOP BY BEST USE - Tackle Boxes
SHOP BY BEST USE - Tool Chests & Tool Boxes
SHOP BY BEST USE - Tool Cribs
SHOP BY BEST USE - Tools & Ladders
SHOP BY BEST USE - Trailers, Vans & Moving Trucks
SHOP BY BEST USE - Tree Stands
SHOP BY BEST USE - Truck Doors
SHOP BY BEST USE - Utility Meters, Substations & Cable Boxes
SHOP BY BEST USE - Vending Machines
SHOP BY BEST USE - Waste Management Equipment
SHOP BY BEST USE - Well & Septic Covers
Automotive Products
Automotive Products - Cargo Security
Automotive Products - Cargo Security - Bungee Cords
Automotive Products - Cargo Security - Cargo Hardware
Automotive Products - Cargo Security - Straps & Nets
Automotive Products - Cargo Security - Tie-Downs
Automotive Products - Motorcyle Security
Automotive Products - Motorcyle Security - Cables / Cable Locks
Automotive Products - Motorcyle Security - Chain
Automotive Products - Motorcyle Security - Disc Brake Locks
Automotive Products - Motorcyle Security - Street cuffs
Automotive Products - Motorcyle Security - U-Locks
Automotive Products - Towing Security
Automotive Products - Towing Security - Coupler Locks
Automotive Products - Towing Security - Couplers
Automotive Products - Towing Security - Heavy Duty Towing
Automotive Products - Towing Security - Hitch Ball Mounts
Automotive Products - Towing Security - Hitch Balls
Automotive Products - Towing Security - Hitches
Automotive Products - Towing Security - Receiver Locks
Automotive Products - Towing Security - Receiver Pins & Clips
Automotive Products - Towing Security - Spare Tire Locks
Automotive Products - Towing Security - Tow Bars & Cables
Automotive Products - Towing Security - Towing Accessories
Automotive Products - Vehicle Security
Automotive Products - Vehicle Security - Outboard motor
Automotive Products - Vehicle Security - Steering Wheel Lock
Automotive Products - 15% OFF SALE
Bicycle Products
Bicycle Products - U-locks - Bikes
Bicycle Products - Cable Locks - Bikes
Bicycle Products - Chain Locks
Cable Locks/Cables
Cable Locks/Cables - Cable Locks Keyed
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Cable Locks/Cables - Python Cable Locks
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Combination Padlocks
Combination Padlocks - Standard Dial Combination
Combination Padlocks - Built In Locker Locks
Combination Padlocks - Set Your Own Combination
Cut Keys
Door Hardware
Door Hardware - Handlesets
Door Hardware - Knobs
Door Hardware - Levers
Door Hardware - Nightwatch security
Door Hardware - Service Parts
Door Hardware - Standard deadbolts
Door Hardware - Window and Door Locks
Door Hardware - SALE - Door Hardware
Government Padlocks/NSN
Government Padlocks/NSN - Government NSN numbers
Government Padlocks/NSN - High Security - Gov't
Gun Locks
Hasps
Keyed Locks
Keyed Locks - Laminated Steel
Keyed Locks - Laminated Brass
Keyed Locks - Solid Body Padlocks
Keyed Locks - Solid Body Padlocks - Aluminum
Keyed Locks - Solid Body Padlocks - Brass
Keyed Locks - Solid Body Padlocks - Chrome
Keyed Locks - Solid Body Padlocks - Solid Die Cast Zinc
Keyed Locks - Solid Body Padlocks - Solid Steel
Keyed Locks - Solid Body Padlocks - SALE - Solid Body
Keyed Locks - Rekeyable Padlocks
Keyed Locks - Rekeyable Padlocks - Die Cast Zinc
Keyed Locks - Rekeyable Padlocks - Hidden Shackle Padlocks
Keyed Locks - Rekeyable Padlocks - Laminated Steel
Keyed Locks - Rekeyable Padlocks - Shrouded - High Security
Keyed Locks - Rekeyable Padlocks - Solid Aluminum
Keyed Locks - Rekeyable Padlocks - Solid Brass
Keyed Locks - Rekeyable Padlocks - Solid Steel - High Security
Keyed Locks - Rekeyable Padlocks - Weather Tough®
Keyed Locks - Economy Padlocks
Keyed Locks - Economy Padlocks - Economy laminated steel
Keyed Locks - Economy Padlocks - Economy solid brass
Keyed Locks - Vending/Meter Padlocks
Keyed Locks - Weather Resistant
Keyed Locks - Warded
Keyed Locks - Fusion Padlocks
High Security Padlocks / Pro Series
High Security Padlocks / Pro Series - Pro Series - Hidden Shackle
High Security Padlocks / Pro Series - Pro Series - Shrouded
High Security Padlocks / Pro Series - Pro Series - Solid Aluminum
High Security Padlocks / Pro Series - Pro Series - Solid Brass
High Security Padlocks / Pro Series - Pro Series - Solid Steel
High Security Padlocks / Pro Series - Pro Series - WeatherTough
High Security Padlocks / Pro Series - SALE - Pro Series
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Safety Lockout/Tagout - Compliance Centers
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Safety Lockout/Tagout - Lockout Stations
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Safety Lockout/Tagout - Padlock Stations
Safety Lockout/Tagout - Padlock Stations - Padlock Stations - English
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Safety Lockout/Tagout - Pnumatic Lockout
Safety Lockout/Tagout - Safety Lockout Padlocks
Safety Lockout/Tagout - Safety Padlock Labels
Safety Lockout/Tagout - Safety Padlock Labels - Multilingual
Safety Lockout/Tagout - Safety Signs
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Safety Lockout/Tagout - Safety Signs - Caution Signs
Safety Lockout/Tagout - Safety Signs - Notice Signs
Safety Lockout/Tagout - Safety Signs - Warning Signs
Safety Lockout/Tagout - Safety Signs - Bilingual Signs
Safety Lockout/Tagout - Safety Tags
Safety Lockout/Tagout - Safety Tags - LockOut Tags
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Safety Lockout/Tagout - Safety Tags - Safety Tags
Safety Lockout/Tagout - Safety Tags - Safety Tags - Danger Tags
Safety Lockout/Tagout - Safety Tags - Safety Tags - Caution Tags
Safety Lockout/Tagout - Safety Tags - Safety Tags - Warning Tags
Safety Lockout/Tagout - Safety Tags - Safety Tags - Notice Tags
Safety Lockout/Tagout - Safety Tags - LockOut Isolation ID Tags
Safety Lockout/Tagout - Safety Tags - LockOut Isolation ID Tags - Control Panel
Safety Lockout/Tagout - Safety Tags - LockOut Isolation ID Tags - Electrical
Safety Lockout/Tagout - Safety Tags - LockOut Isolation ID Tags - Gas
Safety Lockout/Tagout - Safety Tags - LockOut Isolation ID Tags - Pneumatic
Safety Lockout/Tagout - Safety Tags - LockOut Isolation ID Tags - Steam
Safety Lockout/Tagout - Safety Tags - LockOut Isolation ID Tags - Valve
Safety Lockout/Tagout - Safety Tags - LockOut Isolation ID Tags - Water
Safety Lockout/Tagout - Safety Tags - Scaffolding Tags
Safety Lockout/Tagout - Safety Training
Safety Lockout/Tagout - Steering Wheel Lockout
Safety Lockout/Tagout - Valve Lockout
Safety Lockout/Tagout - SALE - Safety Lockout/Tagout
Storage Security
Storage Security - Cash Boxes
Storage Security - Cash Drawers
Storage Security - Key Safes
Storage Security - Storage Accessories
Travel Locks
Travel Locks - Combination Locks
Travel Locks - Non-Locking - Caribiners
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Made in the USA
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Compliance Centers
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Pnumatic Lockout
Pnumatic Lockout
No. S3900 Safety Lockout
As Low As: $12.04 ea.
No. S3900 Safety Lockout
By: MASTER LOCK
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