Is a thicker metal tool chest always better?

Answer: No. Going from 0.8 mm to 1.2 mm all round adds 9 kg to an empty metal tool chest. Thicken the top and base instead.

Do more drawers make a chest more useful?

Answer: Only if they match the tools. Too many drawers push clear height below 60 mm; mix 40, 75 and 120 mm heights.

Are larger castors easier to push?

Answer: They clear obstacles better, but flat-floor resistance rises about 8% from 100 mm to 125 mm.

How much more does three-point locking cost?

Answer: Typically 12% to 18%. It earns the price on bodies wider than 900 mm.

Should peeling paint be grounds for rejection?

Answer: Judge by area. Chipped corners are touch-up work; sheet peeling to bare steel means failed pretreatment.

Specifying a Metal Tool Chest: Five Checks That Decide the Order

Quick answer: Judge a metal tool chest in this order: sheet gauge against load, slides against dynamic rating, lock grade against access, castors against the floor, coating last.

What a Metal Tool Chest Must Carry Before Looks Matter
Drawer Slides Against the Load Map
Lock Grade and Key Control
Castors and How the Chest Travels
Coating, Edges and a 100-Point Scorecard
FAQ

1. What a Metal Tool Chest Must Carry Before Looks Matter

Load first: tools, foam and anything on top, times 1.2. A seven-drawer unit holds 150 kg of tools, lands near 220 kg with foam, and specifies at 265 kg.

Ask gauge per panel: sides resist twisting, the base carries the mass, the top takes hammer blows. Standard is 0.8 mm sides, 1.0 mm base, 1.2 mm top; heavy duty runs 1.5 mm on top and 18% more tare.

Panel	Standard	Heavy duty	What it governs
Sides	0.8 mm	1.0 mm	Twisting when pushed
Base	1.0 mm	1.2 mm	Belly sag under load
Top	1.2 mm	1.5 mm	Bolting on a vice

Then demand the sag figure: bottom drawer at rating, 24 hours, front edge measured. Past 2 mm it is under-specified.

2. Drawer Slides Against the Load Map

Width, length and dynamic rating decide a slide: a 35 mm ball-bearing slide is rated 35 kg, a 45 mm reaches 45 to 60 kg, deeper bodies use 53 mm, and lengths run 350 to 500 mm. A slide 50 mm shorter than the drawer lets the front dip.

Discount the label: that 45 kg is static, leaving about 31 kg at a 0.7 factor. Cap the bottom drawer at 45 kg, middle 20 kg, top 10 kg; a socket drawer weighs 28 kg. A three-quarter slide keeps 25% of the drawer inside.

Heavy low, light high: on a 1000 mm tall, 500 mm deep body the lower drawers take about 60% of the mass.

3. Lock Grade and Key Control

Three jobs, three grades: a 2 mm cam lock stops accidental opening, an 8 mm recessed hasp stops casual removal, 6 mm three-point rods resist leverage. Past 900 mm of width a single lock clamps only the middle and both ends pry open 5 mm.

Grade	Build	Where it fits	Watch out
Cam lock	2 mm cam, no hasp	Home garage	Ends pry open
Cam plus hasp	8 mm shackle	Shared workshop	Log the padlock
Three-point	6 mm rods, top and base	Open stores	Rods need grease

Key control comes first in a metal tool chest: one master key for twelve chests is convenient until it is lost, so group three chests per key. A 50,000-cycle cylinder lasts six years at 20 openings a day.

4. Castors and How the Chest Travels

Diameter first: 100 mm castors are lifted over a 15 mm threshold, 125 mm rolls over, 150 mm takes gravel. Tread next: polypropylene marks epoxy floors, polyurethane runs quiet, rubber damps outdoors.

Never divide the load by four: one wheel hangs at a threshold, so three carry it. 100 kg castors rate 400 kg on paper, 300 kg in practice, and a 20% margin leaves 240 kg.

A total-lock brake pins wheel and swivel together and holds slopes up to 2 degrees, where a single brake would let it spin.

5. Coating, Edges and a 100-Point Scorecard

Epoxy powder goes on at 60 to 80 microns; 240 hours of neutral salt spray without red rust passes, 480 covers coastal work; pretreatment matters more than powder. Edges: R3 corners, folded lips, dressed welds.

Check	Weight	Pass line	Knock-out
Gauge and load	25	Sag ≤2 mm loaded	Sides under 0.8 mm
Drawer slides	25	Dynamic ≥30 kg	No dynamic rating
Lock grade	15	Two-point or interlock	Single lock, wide body
Castors	20	20% margin on three wheels	No brakes
Coating and edges	15	240 h salt spray, R3	No pretreatment stated

Score 70 and it goes to price comparison; a knock-out ends it. Three suppliers filling one table say more about a metal tool chest than any catalogue.

Conclusion

Sequence beats specification sheets: load sets the gauge, rating sets the slides, access sets the lock, floor sets the castors. Run the scorecard past three suppliers and the price gap gains a reason. In that order, the checks pick a metal tool chest that rolls straight in year three.

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.