2 Hide A Key Magnetic Under Car Spare Key Holder
4.6Editor score
Includes two premium magnets
Tough ABS weather case
Large jumbo size capacity
In this guide
Finding a reliable place to hide spare keys outside can be a challenge for homeowners and travelers alike. A magnetic key box for under car offers a discreet and accessible solution that keeps your keys safe from prying eyes while ensuring you can retrieve them quickly when needed.
We evaluated ten top-rated products based on magnet strength, weather resistance, capacity, and ease of use. Our comparison focuses on real-world durability, security features, and how well each box adheres to vehicle chassis without failing during transit or harsh weather conditions.
Each pick highlights specific strengths like lock mechanisms, size capacity, and material quality to help you choose the right fit. Remember that prices and availability change frequently, so verify current details before purchasing to ensure you get the best value for your security needs.
Top 3 Picks for Best Magnetic Key Box for under Car
Magnetic Key Box Hide A Key Holder Under Car
4.6Editor score
Strong waterproof magnetic hold
Portable 3.5 inch size
Secure undercarriage placement
Large Magnetic Key Box for Under Car Fits Bulky Key Fobs
4.3Editor score
Holds bulky key fobs
IPX5 weather protection
Four magnet mounting system
Top 10 Best Magnetic Key Box for under Car in 2026 Compared
This side-by-side comparison outlines the key specifications and features of ten top magnetic key boxes designed for under car storage. Evaluate magnet counts, weather ratings, dimensions, and unique selling points to find the most reliable option for your vehicle and security requirements.
ProductsSpecificationsEditor scorePrice
Editor's Choice
Magnetic Key Box Hide A Key Holder
3.5×2.0x1.0 inch inside
Waterproof magnetic design
Strong magnetic hold
Durable plastic case
4.6Editor score
Editor's Choice
2 Hide A Key Magnetic Under Car
4 inch L x 2 W
Two premium magnets included
Tough ABS case
Multi-use storage option
4.6Editor score
Best Premium
Large Magnetic Key Box for Under Car
Holds bulky key fobs
IPX5 weather protection
Four magnet mounting
Dual retention latches
4.3Editor score
Master Lock Magnetic Key Holder
Stores 1-2 keys
Sliding cover design
4.2 cubic inch volume
Durable plastic construction
4.5Editor score
Magnetic Key Box with Combination Lock
Five strong magnets
Resettable 4-digit code
Ultra-durable material
Includes waterproof bags
4.2Editor score
Magnetic Key Holder Under Car Splash Resistant
60 lbs separation force
Two zip tie holes
Splash resistant design
Removable inside padding
4.7Editor score
Upgraded Magnetic Key Holder Under Car
Three neodymium magnets
51lbs breakaway force
Safety buckle design
Waterproof and weatherproof
4.6Editor score
Nite Ize Hideout Magnetic Key Box
IPX7 waterproof rating
Strong neodymium magnets
Includes 3M adhesive
Extra large capacity
4.6Editor score
Magnetic Key Box with 3 Magnets
Triple magnet system
Weatherproof ABS plastic
Low profile design
No tools required
4.6Editor score
Hide a Key Outside Grey Magnetic Box
Two neodymium magnets
Air-tight waterproof seal
Reliable and durable
Discreet undercarriage placement
4.6Editor score
1. Magnetic Key Box Hide A Key Holder – Best Overall Under Car Storage
Magnetic Key Box Hide A Key Holder
Waterproof magnetic design
3.5×2.0x1.0 inside
Strong magnetic hold
Secure undercarriage placement
This Magnetic Key Box serves as an excellent all-around choice for securing spare keys under your vehicle. With a strong 4.6 rating, users appreciate its waterproof design and reliable magnetic hold that keeps keys safe even in tough conditions.
Pros
- Highly secure hold
- Waterproof construction
- Compact portable size
- Easy to access
- Durable materials
Cons
- Standard size limits bulk
- No locking mechanism
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The super strong magnetic hold ensures the box stays attached to your car frame without worrying about it falling off during transit. Its portable and secure design offers a practical solution for keeping keys safely stored and convenient to access when needed.
While it lacks a combination lock, the discreet undercarriage placement adds a layer of security against casual theft. The durable construction withstands regular exposure to road elements, making it a dependable long-term storage option for most vehicles.
If you need a straightforward and reliable magnetic key box for under car use, this model delivers consistent performance. It is ideal for homeowners and travelers who prioritize ease of access and weather protection without complex locking systems.
Waterproof Security
The waterproof magnetic key holder ensures your keys remain dry and functional even after exposure to rain or road spray.
Reliable Placement
Designed specifically for underneath the car, this box ensures discreet hiding of your keys for added security.
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2. 2 Hide A Key Magnetic Under Car – Best Budget Option
2 Hide A Key Magnetic Under Car
Tough ABS case
Two premium magnets
4x2x5/8 inch size
Multi-use storage
This ALAZCO key box offers exceptional value for those seeking a basic and functional magnetic key box for under car. With a 4.6 rating, it is praised for its tough ABS case and the inclusion of two premium quality magnets for secure attachment.
Pros
- Very affordable price
- Includes two magnets
- Large capacity size
- Versatile storage use
- Weather resistant
Cons
- No locking mechanism
- Plastic durability varies
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Its jumbo size measures 4 inches long by 2 inches wide, providing ample space for keys, small valuables, or notes. The multi-use feature allows you to hide more than just keys, making it versatile for different emergency scenarios.
Although it lacks a combination lock, the durable ABS case stays securely closed to protect contents from weather and wear. Users highlight its convenience for avoiding expensive locksmith calls by keeping a spare key accessible and secure.
For budget-conscious shoppers, this is an ideal entry point into under car key storage. It balances cost and functionality effectively, making it a practical choice for homes, offices, or vehicles requiring simple emergency access solutions.
Value for Money
Priced affordably, this box includes two premium magnets ensuring secure attachment without compromising on essential features.
Jumbo Capacity
Pre-measured large dimensions allow storage of multiple keys and small items beyond standard key fobs.
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3. Large Magnetic Key Box for Under Car – Best Premium Large Capacity
Large Magnetic Key Box for Under Car
Fits bulky fobs
IPX5 weather rating
Four magnet system
Dual retention latches
This large magnetic key box is specifically designed to accommodate bulky key fobs that might not fit in standard holders. With a 4.3 rating, it is valued for its spacious housing and robust four-magnet under-car mounting system.
Pros
- Extra large interior
- IPX5 waterproof
- Four strong magnets
- Secondary zip tie option
- Durable liner
Cons
- Higher price point
- Requires large space
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The IPX5 weather protection shields contents from rain, snow, mud, and road spray, ensuring keys remain functional in harsh conditions. Four side latches and optional zip tie holes provide added security to keep the enclosure closed during travel.
While it is not a combination lock or signal-blocking case, its dual retention system offers peace of mind for high-value keys. The interior liner helps protect items from scratches and wear inside the spacious housing.
Investors in premium security will appreciate the thoughtful design that prioritizes fit and weather resistance. It is an excellent choice for owners of modern vehicles with larger fobs who need reliable under car storage with weather protection.
Spacious Housing
The 8.5 x 5.9 x 2.7 inch housing holds bulky key fobs and multiple items securely.
Enhanced Protection
IPX5 rating and interior liner protect contents from water and mechanical wear during storage.
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4. Master Lock Magnetic Key Holder – Simple Reliable Storage
Master Lock Magnetic Key Holder
Sliding cover design
4.2 cubic inch volume
Stores 1-2 keys
Durable plastic
Master Lock is a trusted name in security products, and this magnetic key holder reflects their commitment to reliability. With a 4.5 rating, it is often used for general steel surfaces though it is not explicitly intended for under car placement.
Pros
- Trusted brand quality
- Simple sliding cover
- Compact dimensions
- Easy to install
- Affordable price
Cons
- Not for under car use
- Small interior volume
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The durable plastic construction features a sliding cover with a built-in stop to prevent the cover from being dropped or misplaced. Its compact size makes it easy to find a magnetic location on various steel surfaces around homes or offices.
While it is affordable and functional, its design is better suited for stationary storage rather than moving vehicles. The 4.2 cubic inch volume is adequate for one or two keys but limits versatility for bulkier items.
If you need a simple magnetic solution for non-vehicle surfaces, this box delivers consistent quality and ease of use. It serves well as a backup option for homes or sheds where under car mounting is not required.
Trusted Brand
Master Lock provides a reliable and durable solution for hiding your keys with proven construction quality.
Simple Design
A sliding cover with built-in stop ensures easy access and prevents cover loss during use.
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5. Magnetic Key Box with Combination Lock – Best Security Feature
Magnetic Key Box with Combination Lock
Resettable 4-digit code
Five strong magnets
Ultra-durable material
Includes waterproof bags
This magnetic key box stands out with a resettable combination lock that adds a layer of security beyond just hiding the box. Rated 4.2, users appreciate the five strong magnets that ensure the box stays firmly fixed on any metal parts under the chassis.
Pros
- Combination lock included
- Five magnet stability
- Waterproof accessories
- Soft inner padding
- Anti-drop design
Cons
- Heavier than others
- Code reset can be tricky
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The combination code can be reset at will, making it difficult for strangers to open without knowing the specific code. Durable materials ensure it withstands long-term use without damage, and soft padding protects keys from scratches inside.
Compared to standard magnetic boxes, the added lock feature offers extra protection against unauthorized access. The waterproof bags provided help protect keys further if the box is exposed to wet or dusty environments during transit.
Security-focused users will find this model offers the best balance of convenience and protection. It is ideal for those who want to store keys under car but also need assurance that the box itself cannot be opened easily.
Resettable Security
A 4-digit password can be reset at will, making the hidden key safer from unauthorized access.
Five Magnet Strength
Equipped with 5 strong magnets for a firm hold that resists falling off during bumpy road conditions.
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6. Magnetic Key Holder Under Car Splash Resistant – Best Weatherproofing
Magnetic Key Holder Under Car Splash Resistant
Splash resistant design
Two zip tie holes
60 lbs separation force
Removable inside padding
With an impressive 4.7 rating, this splash-resistant magnetic key holder is highly rated for its ability to secure keys against rain and road spray. Its two Neodymium magnets provide a 60 lbs separation force ensuring it stays attached to your vehicle.
Pros
- High customer rating
- Strong Neodymium magnets
- Splash resistant latches
- Zip tie security option
- Durable hard plastic
Cons
- Not submersible
- Padding may reduce space
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The design includes four latches and a self-aligning retainer to keep the box securely closed during transit. Two top holes allow for zip ties or chains as a secondary secure method if magnetic attachment is compromised.
Users suggest placing valuables in a zippy bag for extra protection in wet conditions since it is splash resistant not fully submersible. The removable padding inside lets you customize storage space based on your specific item needs.
For those prioritizing weather resistance and strong magnetism, this model offers excellent reliability. It is a great choice for outdoor environments where key protection from water and theft is essential for peace of mind.
Strong Magnetic Force
With a separation force of 60 lbs, the box stays firmly attached to your car even on undulating terrain.
Splash Resistant
Four latches and a retainer ensure the key box doesn't come open unless intentionally opened by the user.
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7. Upgraded Magnetic Key Holder Under Car – Best Value Padding
Upgraded Magnetic Key Holder Under Car
Three neodymium magnets
51lbs breakaway force
Safety buckle design
Waterproof and weatherproof
This upgraded magnetic key holder comes with a soft cushion inside to better protect your belongings from scratches. With a 4.6 rating, it is appreciated for its sturdy build and three neodymium magnets that ensure a strong hold.
Pros
- Soft cushion included
- Strong magnet system
- Waterproof construction
- Safety buckle secure
- Large storage space
Cons
- Padding reduces room
- Limited color choice
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The safety buckle design prevents the box from releasing itself accidentally, providing added security during vehicle travel. It is tested thoroughly in snow, rain, and mud environments ensuring long-term durability for outdoor key storage needs.
While the padding is removable for more space, it offers protection for delicate items like cash or trackers. The magnetic storage box serves as a versatile container for keys, ID cards, or even a mini GPS tracker.
If you need reliable weatherproof protection with added care for stored items, this model is a strong contender. It combines practical features with a durable design that makes it suitable for various outdoor storage applications.
Soft Protection
Equipped with a soft cushion inside to better protect your belongings from wear and damage.
Weather Tested
Thoroughly tested in all environments including snow, rain, and mud to ensure long-term durability.
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8. Nite Ize Hideout Magnetic Key Box – Best Brand Warranty
Nite Ize Hideout Magnetic Key Box
IPX7 waterproof rating
Strong neodymium magnets
Extra large capacity
Includes 3M adhesive
Nite Ize is known for durable gear and this Hideout box offers a fully waterproof IPX7 rating for complete weather protection. With a 4.6 rating, it is praised for its secure magnetic attachment and versatility to attach to various surfaces.
Pros
- Fully waterproof IPX7
- Trusted Nite Ize brand
- Versatile mounting
- Durable construction
- Great for car keys
Cons
- Higher price
- Adhesive plate needed
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The extra large capacity makes it suitable for storing full sets of keys and other items comfortably. It includes a 3M VHB adhesive-backed metal plate allowing for attachment to non-metal surfaces like wood or plastic.
Backed by a Worry Free Guarantee, this box provides peace of mind regarding product quality and durability. Its design keeps contents safe and dry, making it a reliable choice for those needing a high-quality waterproof solution.
Investors in premium durability will appreciate the IPX7 rating and trusted brand reputation. It is an excellent choice for outdoor enthusiasts who need a waterproof and secure storage option for their spare keys.
Waterproof Protection
IPX7 waterproof rating ensures contents stay safe and dry even in wet or submerged conditions.
Versatile Mounting
Includes 3M adhesive-backed metal plate for attaching hideout to wood, plastic, and metal surfaces.
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9. Magnetic Key Box with 3 Magnets – Best Triple Magnet System
Magnetic Key Box with 3 Magnets
Triple magnet system
Waterproof weatherproof
Rugged ABS plastic
Compact low profile
This key box features three powerful magnets providing a maximum-strength hold on any ferrous surface under the car. With a 4.6 rating, it is valued for its rugged ABS plastic construction and waterproof design for extreme weather protection.
Pros
- Super strong magnets
- Weather resistant
- Easy install
- Low profile design
- Wide application
Cons
- Limited lock options
- Standard sizing
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The compact and low-profile design ensures it won't interfere with driving or become an eyesore on your vehicle. No tools are required for installation, making it simple to attach and remove for secure key storage.
It works well for various vehicles including trucks, SUVs, and RVs due to its durable build and strong magnet system. The waterproof and weatherproof features keep keys dry and functional even during heavy rain or snow.
For those needing a reliable and easy-to-install storage box, this model offers great value. It balances strength and simplicity effectively, making it a solid choice for everyday under car key storage needs.
Triple Magnet Hold
Equipped with 3 powerful magnets providing a maximum-strength hold on any ferrous surface.
Compact Design
The compact and low-profile design ensures it won't interfere with driving or become an eyesore.
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10. Hide a Key Outside Grey Magnetic Box – Best Air-Tight Seal
Hide a Key Outside Grey Magnetic Box
Air-tight waterproof seal
Two neodymium magnets
Durable construction
Discreet grey finish
This magnetic box offers an air-tight seal ensuring keys stay dry and protected from moisture and road debris. With a 4.6 rating, it is appreciated for its reliable and durable design that ensures keys are safely stored.
Pros
- Waterproof seal
- Reliable hold
- Durable finish
- Secure placement
- Great for trucks
Cons
- No additional locks
- Limited to metal
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Two strong Neodymium magnets provide a powerful hold to your car without risk of falling off. The waterproof and air-tight features offer extra protection compared to standard plastic boxes exposed to the elements.
The grey finish is designed to be discreet and blend with vehicle components reducing visibility to passersby. It serves as a reliable solution for adding security while keeping keys accessible for emergency use.
If you prioritize weatherproofing and brand reliability, this model delivers consistent performance. It is a solid choice for those needing a secure and waterproof storage option for keys under the vehicle chassis.
Air-Tight Protection
Waterproof air-tight magnetic key box keeps keys dry and secure from external moisture.
Reliable Hold
Designed specifically for under car placement ensuring discreet hiding of your keys securely.
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Buying Guide – How to Choose the Best Magnetic Key Box for under Car
Selecting the right magnetic key box requires evaluating magnet strength, size capacity, weather resistance, and security features. This guide outlines key factors to consider to ensure your keys remain secure and accessible in any condition.
Magnet Strength
Strong magnets are crucial for ensuring the box stays attached to your vehicle's chassis even on rough roads. Look for boxes with multiple neodymium magnets or high separation force ratings to prevent the box from falling off during transit.
Prioritize models with 51 lbs or more separation force for reliable adherence to your car.
Weather Resistance
Since the box will be exposed to rain, snow, and road spray, waterproof or splash-resistant construction is essential. IPX5 or IPX7 ratings indicate how well the box protects contents from water damage.
Choose waterproof boxes to ensure keys stay dry and functional in harsh weather conditions.
Capacity Size
Consider the size of your keys and fobs when choosing a box. Large capacity models accommodate bulky key fobs or multiple items while compact boxes are easier to hide discreetly.
Match the interior dimensions to your key set size for easy access and storage.
Security Features
Some models include combination locks or zip tie holes for added security beyond magnetic attachment. These features prevent unauthorized access if someone finds the box location.
Opt for boxes with locking mechanisms if you need extra security for high-value keys.
Installation Ease
The best boxes require no tools and attach instantly to steel surfaces. Some include adhesive plates for non-metal surfaces expanding where you can mount the box.
Look for tool-free designs to simplify setup and repositioning when needed.
Material Durability
High-quality ABS plastic or metal casings resist cracking under impact and temperature changes. Check for reinforced latches or safety buckles to ensure the box stays closed.
Choose rugged materials to withstand long-term exposure to outdoor elements.
Brand Reputation
Established brands often provide better warranties and reliable customer support. Reading user reviews helps verify if the product performs as advertised in real-world conditions.
Select reputable brands with positive feedback to ensure consistent quality.
Price Value
Prices vary based on features like locks and waterproof ratings. Determine your budget and prioritize features that matter most to your security needs.
Balance cost with essential features to find the best value for your investment.
How to Use and Care for Your Magnetic Key Box for under Car
Start by placing your spare key inside the box and ensuring the latch or lid closes securely. Some models include foam padding so adjust or remove it to fit your key size comfortably.
Attach the box to a clean, flat ferrous steel surface under your chassis such as the frame or bumper bracket. Test the hold by pulling gently before driving to ensure it is firmly in place.
Inspect the box regularly for rust or dirt buildup that could reduce magnet strength or waterproofing. Use a dry cloth to clean the surface and check seals to ensure continued protection.
Frequently Asked Questions
Are magnetic key boxes safe for under car use?
Yes, magnetic key boxes designed for under car use are generally safe when they feature strong neodymium magnets. Ensure the box is rated for high separation force to prevent it from falling off during driving.
Do these boxes come with combination locks?
Some models include combination locks for added security while others rely on magnetic concealment. Check product specifications to confirm if a locking mechanism is included before purchasing.
Can I use these boxes on non-metal surfaces?
Most magnetic boxes stick to metal surfaces but some kits include adhesive plates for wood or plastic. Always verify if the product includes adapters for non-metal mounting options.
How waterproof are magnetic key boxes?
Many boxes feature IPX5 or IPX7 waterproof ratings meaning they resist rain and splashes. However, they are not designed for prolonged submersion in water.
What size keys fit in these boxes?
Capacity varies by model. Standard boxes hold 1-2 keys while larger ones fit bulky key fobs and multiple items. Check interior dimensions before buying to ensure fit.
Will magnets scratch my car paint?
Most boxes come with padding or plastic casings to prevent scratching. Ensure the contact point is clean and smooth to avoid any damage to your vehicle.
How do I reset combination locks?
Follow manufacturer instructions to reset codes usually involving sliding a switch or pressing a button. Test the new code before storing keys to ensure it works correctly.
Final Thoughts on Choosing the Best Magnetic Key Box for under Car
Choosing a magnetic key box for under car involves balancing magnet strength, weatherproofing, and security features. The top picks offer reliable protection for spare keys ensuring you stay prepared for lockout emergencies.
Prioritize boxes with strong magnets and waterproof ratings to ensure durability in diverse weather conditions. Models with combination locks add an extra layer of security for peace of mind.
Always verify current prices and availability before purchasing to get the best deal. Keep your keys safe and secure with the right magnetic storage solution tailored to your vehicle.