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Products > Jobsite-Storage-Equipment > Jobsite Storage > Chest > Model 4830 JOBMASTER® Chest, 25.25 cu ft

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Model 4830 JOBMASTER® Chest, 25.25 cu ft


The Model 4830 KNAACK® JOBMASTER® Chest measures 30 in wide by 48 in long and has a capacity of 25.25 cu ft. It is versatile, portable and can hold anything from hand and power tools to compressors and features a full length piano hinge, stacked and welded to resist break-in attempts. The size is ideal for a personal box on a jobsite or added security inside a trailer.


  • Uses Accessory Tray Model 31
  • WATCHMAN® IV Lock System 3-point latch with recessed lock housing for protection against theft
  • Additional reinforcement between the lock and the side housing
  • Bigger, better hinges offer stronger protection against pry-ins
  • Power Pass® Electrical Pass-Thru grommet provides easy, weatherproof power cord access
  • Four-way skids allow access from any side, making it easier and faster to transport
  • Powder-coat finish for superior durability and corrosion resistance
  • Closed height 34-1/4 in
  • Open height 61-1/4 in


FeatureSize / Details
Height34-1/4 in
Width30 in
Length48 in
Approx. Shipping Weight Lbs.194
Approx. Cu. Ft. Per Unit25.25
Closed Height34-1/4 in
Electrical AccessPower Pass® Electrical Pass-Thru
Lock SystemWATCHMAN® IV Lock System
Powder Coat FinishYes

Package Contents

Part NumberQtyDescription



Additional Chest Models

Model No.HeightWidthLengthApprox. Shipping Weight Lbs.Approx. Cu. Ft. Per UnitClosed Height Buy Online
101036 in30 in66 in4003136 in
203218-1/4 in19 in32 in77518-1/4 in
204828 in24 in48 in1451628 in
206028 in24 in60 in1802028 in
247228-1/4 in24 in72 in21624.528-1/4 in
306828 in30 in60 in2253128 in
3218-1/2 in19 in32 in84518-1/2 in
3621-1/2 in19 in36 in97721-1/2 in
4223-3/8 in19 in42 in114923-3/8 in
482428-1/4 in24 in48 in1581628-1/4 in
483034-1/4 in30 in48 in19425.2534-1/4 in
4830-D35 in30 in48 in2541734-1/4 in
6028-1/4 in24 in60 in19020.2528-1/4 in

Model 4830 - How close can it be to a wall and still open?

I need to bolt a 4830 box to a work deck. How close can be to a wall and still open the top all the way?
Asked by: Anonymous
The cover should sit at a 90 degree angle. You would need about 4.5" between the box and the wall to open the cover.
Answered by: Werner Customer Care
Date published: 2017-05-25

how much does this box weigh empty?

Asked by: Anonymous
192 pounds
Answered by: Werner Customer Care
Date published: 2017-05-11

can the 4830 be fitted with the crane lift accessory kit?

Asked by: Anonymous
Yes you can mount the crane lift on the 4830.
Answered by: Werner Customer Care
Date published: 2015-03-18

Template for bolt holes on legs

Is there a template available that provides a layout of the bolt holes in the legs? I'm planning on mounting the Model 4830 on a concrete slab and would like to put threaded rod into the concrete at the correct positions.
Asked by: Anonymous
we do not have a pre made template. you can use the skid of the box to make your own template
Answered by: Werner Customer Care
Date published: 2017-03-14

What gauge steel are the walls and lid?

Asked by: Anonymous
The 4830 chest is manufactured with 16 gauge steel
Answered by: Werner Customer Care
Date published: 2016-12-06

Does it come with heavy duty casters?

Asked by: Anonymous
The 4830 doesn't come with caster. You will have to order them separately. Caster model number 495, 695, 516 and 600 will all work.
Answered by: Werner Customer Care
Date published: 2016-12-05

Are the Sesamee K436 combination locks equivalent or compatible with the 4830 Jobmaster chest?

Asked by: Anonymous
We recommend using the Masterlock #5 or American #50.
Answered by: Werner Customer Care
Date published: 2015-03-16

What is the NMFC# used for this Knaack Box 4830?

I know the freight class is 85 but what is the NMFC# used for this specific Knaack Box? All I'm able to find on the web would consider this a Metal Tool Box NMFC 39790-08 Freight Class 85 but I'm not sure if this is correct.
Asked by: Anonymous
The class (85) is used for billing purposes by the carriers. The NMFC, is a description of what falls into that category, So 29790 would equate to something about metal boxes.
Answered by: Werner Customer Care
Date published: 2016-11-08

weather protective for electric tools?

Asked by: Anonymous
Our boxes are weather/moisture resistant.
Answered by: Werner Customer Care
Date published: 2017-06-10

Used as a battery box

Would like to use this box as a battery box for batteries. would like to know if they are sealed shut that will not let any gasses from my batteries escape or would I need to vent it? thanks!
Asked by: Anonymous
We cannot suggest using any of our products to store batteries. Batteries have a tendency to leak/explode. In addition, temperature can rise inside our boxes specially when closed.
Answered by: Werner Customer Care
Date published: 2015-09-15
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