Best MasterLock Security Locks

The Master Lock Door Blocker is a reinforcing security device for inward-opening doors that adds protection against intruders while keeping children and pets safely inside. Its standout easy DIY installation and pinch-and-slide operation make it ideal for parents and homeowners seeking simple extra security.

• Boosts home security with reinforced door protection against intruders
• Safeguards children and pets from sneaking out or opening doors to strangers
• Installs quickly yourself in minutes using just a drill and screwdriver
• Locks and unlocks effortlessly with a simple pinch-and-slide motion
• Provides instant visual confirmation when engaged for peace of mind

Easy DIY installation without professional help. Intuitive operation visible at a glance. Versatile for both security and child/pet safety.

Requires drilling for permanent installation. Only works on inward-opening doors. Not easily removable without tools.

The Master Lock M175XDLF is a heavy-duty outdoor combination padlock with a 2-inch zinc body and Tough-Cut boron-carbide shackle 50% harder than hardened steel for superior cut resistance. It's ideal for gates, sheds, or storage where maximum security and weatherproofing are essential.

• Unmatched cut and saw resistance from boron-carbide shackle 50% harder than steel
• Superior weather protection with shackle seal and hinged dial cover for reliable outdoor performance
• Set your own 4-digit combination easily without tools for convenient access control
• Maximum pick and pry resistance via roller pin cylinder for enhanced security
• Durable zinc body with reinforced bumper withstands scratches and daily abuse

Exceptionally tough shackle resists cutting and sawing. Fully weatherproof for harsh outdoor conditions. User-resettable combination for personalized security.

Combination mechanism may be slower than keyed locks for quick access. Bulkier body might not fit smaller hasps. Requires memorizing or recording the code.

The Master Lock M40XT is a heavy-duty stainless steel discus padlock sold in a 2-pack keyed alike for convenient multi-point security. Its shrouded design and octagonal hardened shackle provide superior resistance to prying, cutting, weather, and corrosion, making it ideal for jobsites, storage units, trailers, and unattended gates.

• Ultimate weather resistance with stainless steel body and protective key cover to shield against rain, dust, and grime
• Shrouded design blocks drilling, sawing, prying, and picking for unbeatable theft deterrence
• Octagonal hardened shackle delivers superior defense against cutting and sawing attacks
• Keyed alike convenience lets one key open both locks for effortless access across multiple entry points
• Dual ball bearing locking ensures maximum resistance to hammering and forced entry

Exceptional corrosion resistance for harsh outdoor environments. High-security features like 4-pin cylinder and shrouded body deter thieves effectively. Keyed alike setup simplifies managing multiple locks.

Short 5/8in shackle length may not fit thicker gates or chains. Key-only operation lacks combination convenience for quick access. Heavy-duty build adds noticeable weight for portable use.

The Master Lock M50XKADCCSEN is a keyed discus padlock featuring a Tough-Cut octagonal boron-carbide shackle 50% harder than hardened steel. Its shrouded design and pick-resistant cylinder make it ideal for securing storage units, garages, sheds, trailers, and moving trucks indoors or outdoors.

• Tough-Cut boron-carbide shackle cuts bolt cutter risk by minimizing exposure and exceeding steel hardness by 50%
• Shrouded discus design shields against prying and cutting attacks for superior gate and door security
• Four-pin cylinder delivers maximum pick resistance to deter thieves effectively
• Reinforced body bumper prevents scratches, ensuring long-lasting professional appearance
• Compact 3-1/8in body with 7/16in shackle diameter fits tight spaces on sheds, garages, and trailers

Exceptional shackle strength resists cutting tools better than standard steel locks. High pick resistance from four-pin cylinder enhances overall security. Durable, scratch-resistant body maintains look over time.

Short 5/8in shackle length limits use on thicker hasps. Keyed mechanism requires key management unlike combination locks. Shrouded design may not fit all standard padlock eyes.

The Master Lock 40DPF is a 2-3/4 inch wide stainless steel discus padlock with a hardened steel shackle and shrouded design for superior bolt cutter and pry resistance. It's ideal for homeowners securing garages, sheds, and trailers indoors or outdoors.

• Rust-proof stainless steel body withstands harsh weather for reliable long-term use
• Shrouded design hides shackle to block bolt cutters and saws effectively
• Hardened 3/8in steel shackle resists cutting, prying, and hammering attacks
• 4-pin cylinder and dual levers prevent picking for enhanced pick resistance
• Compact 5/8in shackle length fits tight spaces on gates and storage units

Exceptional corrosion resistance for outdoor durability. Strong anti-cut and anti-pry features boost security. Wide body provides maximum strength without bulk.

Short shackle may not fit thicker hasps or chains. Keyed design requires key management to avoid lockouts.

The Master Lock M736XKAD is a heavy-duty hidden shackle puck lock with a 9-1/16in zinc-plated steel hasp for securing trucks, trailers, and vans. Its bolt cutter-proof design and pick-resistant 5-pin cylinder offer superior protection and reliability.

• Bolt cutter-proof hidden shackle safeguards against tampering and theft
• Zinc-plated solid steel build delivers maximum strength and corrosion resistance for long-term durability
• 5-pin cylinder provides superior pick resistance with key-retaining feature to prevent accidental unlocking
• 9-1/16in high-security hasp ensures secure fit on sliding doors of trucks, vans, and trailers
• Ideal for indoor/outdoor use on moving trucks, buildings, and high-value assets

Eliminates shackle exposure for ultimate cut resistance. Exceptional build quality with solid steel construction. High pick resistance enhances security.

Carriage bolts for installation not included. Requires precise door measurements for proper fit. Heavier design may need sturdy mounting surface.

The Master Lock 1177D ProSeries is a commercial-grade resettable combination padlock with a shrouded brass body and boron-carbide shackle for maximum cut and corrosion resistance. Commercial and industrial users securing tools, fences, and gates should buy it for customizable, keyless security in harsh environments.

• Customize your own 4-digit code from 10,000 combinations for effortless keyless access
• Boron-carbide shackle resists cutting twice as well as hardened steel for superior protection
• Shrouded brass body blocks corrosion and prying in tough outdoor conditions
• Ergonomic dials work with gloves, low light, or darkness for reliable everyday use
• Deadlocking mechanism defeats shimming and rap attacks without needing reset tools

Exceptional cut and pry resistance for high-security needs. User-friendly resettable combination with no tools required. Weatherproof seals extend lifespan in industrial settings.

Shrouded shackle limits maximum opening width for thicker items. 4-digit code requires memorization without key backup. Bulkier industrial build may not suit lightweight residential uses.

The Master Lock Magnum M930XKADLH is a 2-1/2-inch solid steel padlock with a Tough-Cut octagonal boron-carbide shackle 50% harder than hardened steel. Its maximum resistance to cutting, prying, and picking makes it ideal for securing outdoor gates, fences, or sheds.

• Solid steel body delivers unbeatable strength against impacts and forced entry
• Tough-Cut boron-carbide shackle resists cutting and sawing 50% better than hardened steel
• Dual ball bearings and 5-pin cylinder prevent picking, prying, and hammering
• Weatherproof keyway cover and reinforced bumper protect against elements and scratches
• Extended 2-inch shackle offers flexibility for gates, fences, and storage lockers

Exceptional cut and pry resistance for high-security needs. Durable construction withstands harsh outdoor conditions. Extended shackle fits thicker gates and doors easily.

Keyed mechanism requires managing physical keys. Heavier weight due to solid steel build may feel bulky. Specific shackle dimensions may not suit very narrow hasps.

The Master Lock Magnum M115XDLF is a laminated steel padlock with a Tough-Cut boron-carbide shackle 50% harder than hardened steel for superior cut resistance. It's ideal for homeowners and contractors securing outdoor fences, gates, sheds, and storage in harsh weather.

• Ultimate cut and saw resistance with boron-carbide shackle 50% harder than steel
• Lifetime rust protection via Rust-Oleum certified weatherproof covering
• Maximum pry and pick resistance from 4-pin cylinder and dual ball bearings
• Extended 1-1/2 inch shackle fits thick gates, fences, and storage units
• Durable laminated steel body withstands heavy outdoor abuse

Exceptional strength and weather resistance for outdoor security. Tough-Cut shackle defeats bolt cutters and saws effectively. Pick-resistant 4-pin cylinder enhances security.

Only two keys included, limiting spares without duplication. Specific shackle dimensions may not fit very narrow hasps. Keyed design lacks combo convenience for quick access.