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DEFENDER SERIES 300501-53-01 Underbed Box 48 x 19 x 19 Black


The 6.7 cu ft WEATHER GUARD® DEFENDER SERIES™ Model 300501-53-01 Underbed Box provides Professional Protection. This new underbed box includes a tamper-resistant D-handle lock, D-shaped ribbed weather stripping and heavy-duty welded steel body construction and aluminum door.


  • Delivers heavy-duty security with a C-channel reinforced welded door
  • Provides professional durability with welded steel body putting strength where it is needed most
  • Steel body is black powder coated inside and out for maximum protection against oxidation
  • Classic weather resistance from full weather seal with D-shaped ribbed weather stripping
  • Tamper-resistant D-handle locks; drill resistant through key hole
  • Door is supported with durable steel chains
  • D-handle locks are easy to use, even when wearing gloves
  • Welded aluminum channels keep the cover closing evenly to make sure that the cover is fully latched
  • Fits flatbed, platform or dump trucks
  • Seven Year Warranty


FeatureSize / Details
StyleUnderbed Box
Box TypeStandard
Approx. Product Height19
Approx. Product Width19 in
Approx. Product Length48
Vehicle TypeFlatbed
Bed Length6-1/2 ft, 8 ft
Bed Style - Flare SideNo
Electrical AccessNo
Key AlikeOn Request
Reinforced Loop StrikerNo
Lock SystemPush Button
Powder Coat FinishYes
Weather SealYes
Approx. Shipping Weight Lbs.62
Approx. Cu. Ft. Per Unit9.5

Package Contents

Part NumberQtyDescription



Additional DEFENDER Series Models

Model No.StyleBox TypeColorApprox. Product HeightApprox. Product WidthApprox. Product LengthBuy Online
300104-53-01Saddle BoxCompact SlimBlack18.219-5/8 in61.85
300104-9-01Saddle BoxCompact SlimUncoated18.219-5/8 in61.86
300105-53-01Saddle BoxFull StandardBlack17.6719-5/8 in71.36
300105-9-01Saddle BoxFull StandardUncoated17.6719-5/8 in71.36
300106-53-01Saddle BoxFull Low ProfileBlack16.1919-5/8 in71.36
300106-9-01Saddle BoxFull Low ProfileUncoated16.1919-5/8 in71.36
300207-53-01Cross BoxFull StandardBlack17.7519-5/8 in71.486
300207-9-01Cross BoxFull StandardUncoated17.7519-5/8 in71.486
300300-53-01Lo-Side BoxStandardBlack12.8616-5/8 in60.06
300300-9-01Lo-Side BoxStandardUncoated12.8616-5/8 in60.09
300301-53-01Lo-Side BoxLongBlack12.8616-5/8 in72.09
300301-9-01Lo-Side BoxLongUncoated12.8616-5/8 in72.09
300302-53-01Hi-Side BoxStandardBlack16.0813-1/3 in60.09
300302-9-01Hi-Side BoxStandardUncoated16.0813-1/3 in60.09
300303-53-01Hi-Side BoxLongBlack16.0813-1/3 in90.09
300303-9-01Hi-Side BoxLongUncoated16.0813-1/3 in90.09
300304-53-01Lo-Side BoxShortBlack12.916-5/8 in46.659
300304-9-01Lo-Side BoxShortUncoated12.916-5/8 in46.659
300401-53-01All Purpose ChestStandardBlack19.319-5/8 in50.192
300401-9-01All Purpose ChestStandardUncoated19.319-5/8 in50.192
300500-53-01Underbed BoxShortBlack1919 in36
300500-9-01Underbed BoxShortUncoated1919 in36
300501-53-01Underbed BoxStandardBlack1919 in48
300501-9-01Underbed BoxFull-SizeUncoated1919 in48
302105-53-01Saddle BoxFull StandardBlack17.719-5/8 in71.36
302105-9-01Saddle BoxFull StandardUncoated17.719-5/8 in71.36

DEFENDER SERIES 300501-53-01 Underbed Box 48 x 19 x 19 Black is rated 5.0 out of 5 by 1.
Rated 5 out of 5 by from 4 jumbo boxes mounted on F550 flat bed I went to truck show and looked at all Mfg's boxes. I liked Weatherguard very much. Mounted two 24" deep by 60" long and two 24" deep by 48" long boxes on flatbed (bed is 12 feet long) INSTALLED 3/2016The good:Boxes hold a good amount versus a utility box setup.Heavy duty overall.Doors seal well. No leaks and easy to close with one lever. Adjustable chain on.door is a must over others fixed cable setups!!!The bad:These boxes are so deep you have to extend chain to drop door to reach into box. I use a single cable only on one side. Cable is just chain and adjustable.The boxes are not designed for above bed (flatbed) mounting so have to be set hanging over flatbed.On one box the rod used to open and close fell off and took some doing to open.One lock is hard to lock unlock.First set of boxes for 60" wide both came in dented and front doors poorly made, and chips.. The factory replaced but took weeks. NOT SURE WHY MFG. DOES NOT MAKE FLATBED TYPE BOXES???I plan to add boxes above these for more storage.
Date published: 2016-10-08
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Do you make the under body chassis mount to mount this box to a 2016 Ford F550?

Asked by: Rudy
We do not make any mounts for the under body boxes
Answered by: Werner Customer Care
Date published: 2017-06-08

can I get a door sold and hinge sold separately from the rest. because I just messed up the door

need spare door and hinge
Asked by: raul
The part number for the new door/hinge is 70229-5-02
Answered by: Werner Customer Care
Date published: 2017-07-31

what's the steel thickness of the toolbox and the door

Asked by: Anonymous
Body is 14 gauge steel and the door is .05 smooth aluminum.
Answered by: Werner Customer Care
Date published: 2017-06-16

How thick is are the aluminum walls

Asked by: Steve
Aluminum thickness is .05
Answered by: Werner Customer Care
Date published: 2017-02-24

How do you drop lid to 180 position?

With chains disconnected lid will drop to 150/160 degrees. Bottom of lid comes in contact with bottom of drip rail and stops. Loosened hinge screws to try and adjust no success.
Asked by: Dennis
I apologize for the information that is displayed on the underbed boxes. We are in the process of updating the information. This lid will unfortunately not drop to a 180 degree angle. It will be around 150-160 degrees like you stated.
Answered by: Werner Customer Care
Date published: 2015-04-22

Is there any replacement parts for this Box

Asked by: Andersonsrailshop
Please contact our customer care department at 888-523-3370 Monday through Friday 8 AM till 5 PM EST to order/inquire about the replacement part/assistance you are seeking.
Answered by: Werner Customer Care
Date published: 2015-12-14

Why are aluminum boxes not available in white powder coat?

Asked by: Anonymous
Weatherguard has always just manufactured these boxes in the clear coat. There is not specific reason for not manufacturing in the white powder coat.
Answered by: Werner Customer Care
Date published: 2014-12-30

How do I order replacement keys

I already have a weather guard tool box but I only have one key. I am in need of 2 additional keys.
Asked by: Patrick
Replacement keys are available for purchase through any of our distributors in your area.
Answered by: Werner Customer Care
Date published: 2016-03-17

do you make a box that sits vertically?

Looking for a box that's sits straight up. 2-3' tall. 18-24" wide. 12-18" deep.
Asked by: dee
Unfortunately no. We do not make an underbed box that sits vertically.
Answered by: Werner Customer Care
Date published: 2015-05-08

I am replacing a Weather Guard underbed box that is 30" wide x 18" tall by 18" deep. Do you still make that size?

Asked by: Jack
Please go to the following link, to see the Underbed boxes that are available in that size: http://www.weatherguard.com/en/products/truck-tool-boxes-equipment/boxes?ipp=24&cp=1&sort=default&tts=1500920694728
Answered by: Werner Customer Care
Date published: 2017-07-24
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