Is a thicker wall always better on a mobile tool cabinet?

Answer: No. Vertical load runs through the uprights and gauge only resists dents; a 1.2 mm closed upright on a 2.0 mm plate is lighter and stiffer than an all-2 mm body.

Four casters are rated 90 kg each, so why is the total 216 kg?

Answer: A floor never gives four-point contact. Three-point conversion at 0.6 turns a nominal 360 kg into 216 kg, leaving about 148 kg.

How much drawer sag is normal at full extension?

Answer: A 500 mm three-section slide at its rated 45 kg should hold 6 mm; past 8 mm the faces are out of parallel.

Can the central lock secure only some drawers?

Answer: Yes, by leaving hooks off the rod. Most users lock everything from one rod; a valuables zone takes a short rod with its own key.

Is a flange or a swage better for stiffening a shelf?

Answer: The flange. A 20 mm fold turns 1.0 mm sheet into a 20 mm beam, about eight times the stiffness, while three 4 mm swages give twice.

Mobile Tool Cabinet Structure and Craft: Five Points

Quick answer: A mobile tool cabinet absorbs weight pressing down, sway while pushed and the forward tip of a brake stop. Five layers answer them: uprights, base plate, slides, one lock rod, shelf flanges, each with a dimension worth measuring.

How the Mobile Tool Cabinet Frame Is Built
Casters and the Base Plate
Drawer Slides and Their Travel
One Lock Rod for Every Drawer
Shelf Reinforcement and Span
FAQ

1. How the Mobile Tool Cabinet Frame Is Built

A cabinet on a shop floor takes weight pressing down, side sway while pushed, and the forward tip of a brake stop. The frame funnels all three into the uprights.

Uprights are 1.2 mm cold-rolled steel folded into a closed 40 mm by 40 mm post, one per corner plus a centre. A closed section twists at about three times the stiffness of an open channel.

Weld uprights to the base plate, square the diagonals, hang the panels, fit the top frame. Under 2 mm of error no drawer needs shims; 30 mm stitch runs at 80 mm pitch keep heat out of 0.8 mm sheet.

Part	Material and size	Role
Upright	1.2 mm cold-rolled, folded 40 by 40 mm	Carries vertical load
Base plate	2.0 mm steel, caster seats punched	Splits weight four ways
Side panel	0.8 mm steel, 15 mm flange	Carries slides, closes side

A 1000 by 500 by 1600 mm cabinet weighs 68 kg empty; 0.8 mm uprights and two fewer posts bring 52 kg, but 2000 loaded pushes drift the diagonals past 4 mm.

2. Casters and the Base Plate

Two swivel casters and two fixed, the fixed pair under the handle. Brake a swivel so one step locks wheel and swivel, and the mobile tool cabinet holds on a slope.

Mobile Tool Cabinet: close view of the navy seam running up to the right, a round hinge knuckle on it, raised ribs either side

Capacity cannot be added up: four casters at 90 kg suggest 360 kg, but an uneven floor loads three points, so a 0.6 factor leaves 216 kg and about 148 kg of payload after the 68 kg empty weight. A 100 mm wheel clears an 8 mm lip, 125 mm clears 15 mm. Polyurethane near Shore A 95 marks no epoxy; nylon cracks thin panels at the caster plate.

3. Drawer Slides and Their Travel

Travel comes first on a mobile tool cabinet. A two-section slide gives three-quarter extension and hides the back 125 mm of a 500 mm drawer; three-section runs full.

A 500 mm drawer needs 1.5 mm per side, and the mounting faces must stay parallel within 0.3 mm over 300 mm.

Slide	Extension	Rated load	Sag at rated load
Two-section ball	Three-quarter	25 kg	5 mm
Three-section ball	Full	45 kg	6 mm

Sag is the life number: 6 mm at the rated 45 kg is normal, 9 mm means worn balls. Keep the drawer under 600 mm wide.

4. One Lock Rod for Every Drawer

A mobile tool cabinet carries one lock, not one per drawer. An 8 mm rod runs through the front frame with a hook per drawer; a 90 degree turn moves it 12 mm.

Mobile Tool Cabinet: open navy case, tray of gold hex bits in the lid, pliers, an adjustable wrench, screwdrivers and a bent pry bar below

That travel is the interlock: a drawer left 10 mm open holds the rod, so the key never reaches its stop. Mechanical, with no sensor and no battery.

Depth of bite beats rod diameter: 3 mm hooks biting 6 mm deform the frame first; at 3 mm of bite a screwdriver pops one open. The rod sits inside the folded frame, only a 25 mm lock face showing.

5. Shelf Reinforcement and Span

On a mobile tool cabinet, capacity lives in the flange. A 20 mm fold on 1.0 mm sheet makes a 20 mm beam, roughly eight times stiffer; three 4 mm swages give about twice.

At a 900 mm span, two brackets per side within 600 mm; at 1200 mm add a centre bracket or deepen to 25 mm. Holes sit at 25 or 32 mm pitch.

Conclusion

Five layers carry the structure: uprights, base plate, slides, one rod, shelf flanges. Weaken one and the cabinet tells you within three months. The craft sits in weld sequence, mounting-face parallelism and flange height, and the working life of a mobile tool cabinet follows from those five.

This article discusses only the container (case body) side of specifications and design intent, and does not cover any handling, loading or use of the contents.