The part nobody specifies
Buyers pick the cart by its deck size and capacity, then accept whatever casters come standard. That is backwards.
A cart is a steel frame with a deck on it. There is not much to get wrong, and most manufacturers in this category build competently. The frame is rarely why a cart disappoints.
What disappoints is the rolling. A cart that will not track straight, that stops dead at a floor joint, that takes two people to start moving, that gouges an epoxy floor, or whose wheels flat-spot after six months in a wash bay. Every one of those is a caster problem, and every one of them was decided by a spec line most buyers never read.
Casters are also the cheapest thing on the cart to get right at purchase and the most expensive to fix afterwards, because retrofitting means taking the fleet out of service and matching bolt patterns you did not record.
Decides capacity
Rating per caster
And the arithmetic is not what most people assume. Section two.
Decides your floor
Wheel material
The wrong compound either marks your floor or gets destroyed by it. Section three.
Decides the effort
Diameter and bearings
Push force is largely a function of these two. Section four.
So this guide is ordered accordingly. Casters first, cart second. If you already know your casters, jump to cart types.
Casters: the 3-corner rule
The single most common specification error in this category, and it is a division problem.
You have a 3,000 lb cart. It has four casters. So each caster carries 750 lbs, and casters rated 750 lbs will do. That reasoning is intuitive, extremely common, and wrong.
On a real industrial floor, one of the four casters is always unloaded. Concrete is not flat, frames flex, and loads sit unevenly. At any given moment three casters carry the weight and the fourth floats. Which one floats changes as the cart moves.
So you divide by three, not four, and then add a safety margin for the shock loading that happens every time a wheel crosses a floor joint or drops off a dock plate.
- ÷ 3
- Three casters carry the load, not four. This is the part people miss.
- × 1.2
- A 20% safety factor as the minimum, more for harder duty. See the table below.
- Total weight
- Payload plus the weight of the cart itself. Steel carts are heavy.
3,000 ÷ 3 = 1,000 lb → 1,000 × 1.2 = 1,200 lb minimum per caster.
Not 750. Specify four casters rated 1,200 lb each. Buying to the ÷4 figure means running every caster at roughly 60% over its real duty, which is why they fail early and why the cart gets harder to push as the wheels deform.
Safety factor by duty
The 20% above is a floor, not a universal answer. Published guidance scales it to how hard the application is:
| Application | Safety factor | Multiplier |
|---|---|---|
| Light commercial | 15 to 20% | × 1.15 to 1.20 |
| Warehouse picking | 20 to 30% | × 1.20 to 1.30 |
| Transfer carts | 25 to 35% | × 1.25 to 1.35 |
| Heavy industrial | 40 to 60% | × 1.40 to 1.60 |
| Aerospace and defense | 50 to 100% | × 1.50 to 2.00 |
Carts with two extra wheels in the centre spread the load further and give a tighter turning radius. If you are near the top of a caster's rating on a four-wheel cart, a six-wheel version of the same deck is often the cheaper fix, and it pushes better too. Section four covers the layout.
Total loaded weight means payload plus tare. A heavy steel shelf truck can weigh a couple of hundred pounds empty. Leaving it out of the calculation is how a correctly-reasoned spec still ends up under-rated.
Wheel material
This is a floor decision as much as a load decision. Match the wheel to the surface it lives on.
| Material | Capacity | Floor protection | Rolling | Noise | Suits |
|---|---|---|---|---|---|
| Polyurethane | Medium to heavy | Excellent non-marking options | Smooth, low resistance | Quiet | Sealed and epoxy floors, smooth concrete. The default for most indoor work. |
| Rubber | Medium | Very good soft compounds resist scuffing | Good traction, absorbs shock | Quiet | Hardwood, tile, sealed floors. Where floor protection outranks capacity. |
| Phenolic | Heavy duty | Poor hard, can mark | Higher resistance | Noisier | High temperature, rated to 450°F and above. Bakeries, ovens, heat treat. |
| Nylon and plastics | Light to medium | Fair | Varies with formulation | Can chatter on rough floors | Budget applications, and specific chemical resistance needs. |
| Cast iron and steel | Extreme up to 40,000 lb per caster | None will scar most surfaces | Higher resistance | Very loud | Foundries, heavy industrial, rail systems. Where nothing else survives. |
How to choose in practice
Work through it in this order and the answer usually falls out:
- Is the floor finished? Epoxy, sealed concrete, tile or hardwood means non-marking polyurethane or rubber. A phenolic wheel on an epoxy floor is a maintenance bill.
- Is there heat? Above roughly 180°F, most polyurethanes and rubbers are out. Phenolic handles 450°F and above. Say the actual temperature when you ask, because compounds vary widely.
- Is there chemistry, oil or washdown? This narrows the compound and it also drives the bearing choice. Sealed precision bearings for anything wet.
- How heavy, really? Only after the first three does capacity narrow the field. Most carts never need cast iron.
Soft wheels protect floors and roll quietly, but they deform under load, which increases rolling resistance and can flat-spot if a cart sits loaded in one spot for weeks. Hard wheels roll easily under heavy loads and transmit every floor imperfection into the load, the frame and the operator's hands. There is no free option; pick the failure you can live with.
Diameter, bearings and layout
Three more caster specs that decide how the cart behaves under a person's hands.
Diameter: the cheapest way to reduce push force
A larger wheel rolls over an obstacle more easily because it meets it at a shallower angle. This is basic geometry and it is the single most effective lever on push effort.
The cost of a larger wheel is deck height. A 6″ caster raises the load surface, which matters if operators lift onto it or if the cart has to pass under something.
Bearings
| Bearing | Rolling resistance | Use it for |
|---|---|---|
| Plain bearing / bushing | Highest | Lowest cost. Equipment that is stationary or repositioned occasionally. |
| Roller bearing | Moderate | The common industrial choice. Frequent movement at moderate speed with real load. |
| Sealed precision ball | Lowest | Frequent movement, debris, and washdown. Longest service life, and the right answer wherever water or grit gets in. |
If a cart moves many times a shift, the bearing upgrade repays itself in reduced operator effort long before it repays itself in service life.
Swivel and rigid layout
How you mix swivel and rigid casters decides how the cart steers, and there is no universally correct answer:
- Four swivel. Moves in any direction, including sideways. Excellent in congested areas, poor over distance because it wanders and needs constant correction.
- Two swivel, two rigid. Tracks straight, steers from one end like a trolley. The standard for longer runs. Cannot move sideways.
- Six wheel, four swivel plus two rigid. The centre wheels let the cart pivot almost on the spot, giving a tighter turning radius than a four-wheel cart while keeping directional stability over longer pushes. Also spreads the load. This is why the layout exists and it is worth the extra cost in tight facilities with long aisles.
Brakes
Specify them wherever a cart is loaded or unloaded by hand, parked on any slope, or used as a work surface. A wheel brake stops the wheel turning; a total-lock brake stops the wheel and the swivel, which is what you actually want on a cart that must not creep. Ask for total lock by name, because plain wheel brakes are the default.
Push force and ergonomics
The reason to buy a cart is to save people's backs. It is worth checking that it does.
Two different forces matter, and the first is always the larger:
- Initial force, to break the cart out of standstill and overcome static resistance.
- Sustained force, to keep it rolling once moving.
Published ergonomics guidance puts a practical ceiling on the first: starting a cart moving should not require more than about 50 pounds of force, roughly 220 newtons. If your people are leaning into a cart with both arms and a shoulder to get it going, it is over-loaded, under-wheeled, or worn out.
The recognised reference tables for this are the Liberty Mutual tables, often called the Snook tables, which give acceptable push and pull forces adjusted for the population you are designing for, how far the load travels, and how often. If you have a genuine ergonomics problem, or a claim history, those tables are the tool to reach for rather than a rule of thumb.
When a cart is too hard to push, work down this list before buying a new one. 1. Larger diameter wheels. 2. Better bearings, sealed precision. 3. Reduce the load, or split it across two trips. 4. Fix the floor at the specific place people complain about. 5. Add a proper handle at the right height. Most push-force complaints are solved by the first two.
It gets worse. Frames bend and stop tracking true, wheels get cut or go out of round, bearings wear. A cart that was comfortable when new can drift well past a safe push force without anyone deciding anything. That is the argument for section eleven.
Cart types by job
With the casters settled, the cart itself is mostly a question of what the load looks like.
Picking and service
Utility and service carts
Two or three open shelves, light to medium duty, built for order picking and parts retrieval. Available in steel, aluminium, stainless and polymer. The workhorse of any stockroom.
Volume transport
Shelf and stock trucks
Heavier, deeper, more capacity. Deep shelf trucks come in 3″, 6″, 9″ and 12″ shelf depths, with solid sides to contain loose parts or mesh sides for visibility and airflow.
Bulk and awkward
Platform and stake trucks
A flat deck with optional stake sides. For anything that does not suit shelves: crates, machines, drums, oversized loads. Stake sides convert an open deck into a contained one.
Loose material
Box trucks and bulk trucks
Two and three sided trucks contain loose or bulky material while leaving one side open for loading and dumping. Solid or mesh, depending on whether contents would fall through.
Tooling
Tool and maintenance carts
Drawers rather than shelves, so tools stay organised and secure in transit. Modular drawer carts bring proper drawer storage to the machine. A-frame carts give two-sided access in a compact footprint.
Short moves
Dollies and hand trucks
Steel, plastic, hardwood or fiberglass dollies for boxes and equipment in tight spaces. Hand trucks for single heavy items over short distances. The lowest-cost mobility there is.
Clean environments
Stainless and polymer carts
Washdown-ready for food, pharmaceutical, medical and lab work. Polymer resists corrosion in wet environments where even stainless fittings eventually complain.
Security
Controlled access and security carts
Lockable enclosures for valuable or sensitive inventory in transit. Worth it wherever a cart crosses an area you do not control.
Open wire shelving is lighter, cheaper, easier to clean and lets you see the load. Solid shelves with a retaining lip stop small parts migrating off the edge during a push. Mesh sides split the difference: containment with visibility and airflow. Decide by asking what happens if the cart gets pushed briskly round a corner.
Building a cart from components
Utility and service carts are frequently cheaper, and always more flexible, bought as parts. There is one number that decides whether it works.
A wire utility cart is a shelving unit with casters under it. That is not a criticism, it is a purchasing opportunity, because the same shelves, posts, dividers and casters are sold separately. You can build the exact cart you want, convert a stationary unit you already own, add a shelf level later, or split one cart into two.
A stationary wire shelving unit is published at up to 2,000 lb per unit. Put it on casters and the published rating is no longer the unit's, it is the caster set's, and those are quoted per cart:
| Caster | Size | Capacity per cart |
|---|---|---|
| Polyurethane | 5 in / 6 in | 900 lb / 1,200 lb |
| Polymer | 5 in | 900 lb |
| Stainless steel | 5 in / 6 in | 750 lb / 900 lb |
| Resilient rubber | 5 in | 600 lb |
This is the mistake that turns a cheap conversion into a reorder. Stationary posts have adjustable levelling bolts in the foot to compensate for uneven floors. Mobile posts ship without levelling bolts, because the socket has to take a stem caster instead. You cannot simply screw casters into the unit you already have. Order mobile posts, or order the conversion as a set, and check the caster stem type matches.
What you get for building it yourself
- Exactly the shelf count you need. Two, three and four shelf carts are all the same posts with a different number of shelves on them. Posts are grooved at 1 inch increments, so the spacing is yours to set rather than the catalogue's.
- Finish matched to the room. Shelves, posts, dividers and casters are each available in chrome, epoxy and stainless. Note that this is the same finish decision covered in our industrial shelving guide, including the trap that chrome is NSF listed for dry environments only.
- Dividers on the shelves that need them. Full-height dividers give maximum separation between stored items, which turns an open shelf into something closer to a picking face.
- Upgrade rather than replace. A cart that is being pushed too hard gets bigger casters, not a new cart. Diameter is the cheapest way to reduce push force, as section four covered.
The other answer: buy the deck low instead
Where the load is heavy or awkward rather than numerous, a shelf cart is the wrong shape and a low profile cart is the right one. The reduced deck height lowers the centre of gravity for stable transport, reduces lift-in height, and minimises the risk of tipping. It also lets the cart travel under work surfaces and through constrained aisles.
| Series | Brand | Capacity |
|---|---|---|
| SX-Series | Jamco | 2,400 lb |
| ST-Series | MECO | Up to 2,000 lb |
| Low profile | Strong-Hold | 2,000 lb |
| SL-Series and XL-Series | Jamco | 1,200 lb |
Capacity gets quoted, but the reason to buy a low deck is usually the person loading it. Every inch you take off the deck is an inch less that a heavy item has to be lifted, on every load, all day. If the complaint about a cart is that the loading is hard rather than that the pushing is hard, the answer is deck height rather than casters.
Tool storage that moves
The same drawer cabinet, the same bins and the same panels you would fix to a wall, put on wheels. The decision is not what to store. It is whether the storage should travel.
Tool and maintenance carts are where three product categories overlap: cabinets, workbenches and carts. Getting the choice right is worth more than getting the model right, so start with the question underneath it.
Mobile drawer cabinets
The drawer cabinet families covered in the cabinets guide exist in mobile form at the same widths and the same two duty tiers. Published widths run 24, 30, 36, 48, 60, 62 and 72 inches at 400 lb per drawer, and 18, 36 and 54 inches at 100 lb per drawer. Multi-drawer, two-column versions are available in the wider sizes just as they are in the stationary range.
A drawer rated 400 lb is still 400 lb on wheels, because the slide is the same slide. What changes is the total the cart can carry and how it behaves when you push it. Published cart capacities across this range run from 1,200 lb to 3,600 lb, and the spread is not about the drawers at all. It is the frame and the casters, which is the same point section seven made about component carts. Ask for the cart capacity and the per-drawer capacity separately, because a supplier quoting only one of them has told you half the answer.
| Type | Brand | Cart capacity |
|---|---|---|
| 48 in tool cabinet carts | Little Giant | 3,600 lb |
| Louvered panel maintenance cart | Little Giant | 3,600 lb |
| Sloped shelf bin cart | Little Giant | 2,400 lb |
| Mobile storage cabinets | Strong Hold | Up to 1,900 lb |
| 36 in tool cabinet cart | Little Giant | 1,200 lb |
| Stainless mobile cabinet cart | Jamco | 1,200 lb |
| Pegboard and bin carts | Little Giant | 1,200 lb |
Drawers, panels or bins
Once the cart is decided, the storage format follows from how the tools are used rather than from how many there are.
If tools go missing or jobs stall while somebody hunts for a wrench, visibility beats capacity. A pegboard cart with an outlined place for every tool makes an incomplete set obvious in one second, at the point of use, with no audit. That is a housekeeping control disguised as a product, and it costs less than a drawer cart.
Double-sided pegboard and louvered carts give access from both faces, which is excellent in an open bay and a problem in an aisle, because you need clearance on both sides to use it. Check the working clearance, not just the footprint, before choosing a double-sided unit.
Frame carts for flat and awkward material
The A-frame and sheet-and-panel trucks covered in the specialty section also appear here in tool-carrying form, published at 3,600 lb for the standard frame trucks, 2,000 lb for the version with a back shelf, and up to 2,000 lb for A-frame panel trucks. The frame carries sheet material upright, and the back shelf or pegboard turns the same cart into a work station for the job that material is going to. On a maintenance route carrying both panels and tools, one cart doing both jobs beats two carts doing one each.
Reading a deck and frame spec
Fewer traps here than in casters, but a few specs repay attention.
Capacity, and how it is distributed
A published capacity is a total across the cart, evenly distributed. A Little Giant three-shelf six-wheel cart, for example, is rated 3,600 lbs across all three shelves. That is not 3,600 lbs on the top shelf. Concentrated loads and point loads change the case, and stacking all the weight high raises the centre of gravity in a way that matters when the cart is moving.
Load heavy on the bottom shelf. It is better for stability, better for the casters and better for the person pushing.
Gauge and construction
Lower gauge numbers mean thicker steel. Heavy-duty shelves are commonly 12 gauge, and all-welded construction is stiffer and stays tight over years where bolted assemblies loosen. Powder coat is standard and worth having over wet paint on something that gets knocked constantly.
Shelf edges: flush or lipped
A genuine choice that buyers often skip past. Flush edges let you slide large items on and off without lifting them over a rim. A retaining lip, typically around 1-1/2″, stops parts sliding off in transit. Pick by whether your load is one big thing or many small things, and note that the same cart family usually offers both.
Working height
A top shelf around 36″ sits at comfortable standing work height, which matters if the cart doubles as a staging surface. Lower decks reduce lifting effort for heavy items, which is the entire point of a low-profile cart. Decide which of the two jobs the cart is really doing.
Handles
Often unspecified and worth asking about. A handle at the wrong height forces a bent-wrist or raised-shoulder push, which wastes force and causes complaints. Where a cart is pushed frequently and over distance, an ergonomic handle at roughly elbow height is not a luxury.
Specialty carts
Where a general-purpose cart is the wrong tool and a purpose-built one pays for itself immediately.
Sheet and panel trucks
Carry large flat material upright in angled racks so it does not bend, flex or get damaged. Anyone transporting sheet metal, board or panel flat on a standard cart is damaging material and does not always know it.
Bar and pipe handling
Cradles for long stock. Long heavy material on a flat deck overhangs, becomes a strike hazard, and is awkward for one person. A cradle cart makes it a one-person job.
Wire reel carts and caddies
Hold spools so wire, cable or hose pays out under control rather than tangling. Small purchase, disproportionate effect on how tidy an electrical or maintenance operation looks.
Cylinder trucks
Compressed gas cylinders are heavy, unstable upright and pressure vessels. A cylinder truck with secure chain restraints is the correct way to move them. This is a safety item, not a convenience item, and it sits alongside the storage requirements in our machine guarding and cabinets guides.
Drum trucks and dollies
Purpose-built geometry for tilting and moving a full drum without a second person or a back injury.
Tilt trucks
For waste, scrap and chips. The tilt mechanism is the whole product: it turns emptying from a lifting task into a controlled pour. Available in steel for hot or sharp material and poly for corrosion resistance and lighter weight.
Instrument carts
Protective, sometimes lockable shelving for sensitive equipment. Consider wheel choice carefully here, since soft large-diameter wheels reduce the shock transmitted to whatever is riding on top.
Pallet stands
Raise a pallet to working height so people are not bending to floor level all day. A small ergonomic intervention with a good return where picking happens off pallets.
When manual stops making sense
There is a point where adding another manual cart is the wrong answer.
Manual carts have a ceiling, and it is set by people rather than by steel. The signs you have reached it:
- Loads routinely need two people to start moving.
- Push force is over the practical ceiling even with correct wheels and good bearings.
- The same long run happens many times a shift.
- There are ramps or slopes on the route.
- You have a musculoskeletal claim history tied to material movement.
Electric drive platform trucks answer this directly: a battery-powered drive moves the load and the operator steers. The load no longer has to be within human push capability, and the fatigue that accumulates across a shift largely goes away.
The considerations are charging infrastructure, battery management, operator training, and whether your aisles suit a powered unit. But if you are buying manual carts to solve a problem that is really about repeated heavy pushing, powered is worth pricing before you buy six more carts.
Before going powered, check whether the problem is actually the route. A single bad floor joint, a threshold, or a tight turn can be responsible for most of the effort and most of the complaints. Fixing four feet of concrete is cheaper than a powered fleet.
Choosing by application
Find the row that matches your situation.
Maintenance, and why it matters more here
Most equipment degrades and keeps working. A cart degrades and quietly transfers the difference to a person's shoulders.
That is the distinction worth internalising. A worn caster does not announce itself. It just makes the cart a little harder to push, and then a little harder, until pushing it is a two-person job that everybody grumbles about and nobody reports.
- Inspect wheels for flat spots, cuts and out-of-round. A flat-spotted wheel roughly doubles the effort at every rotation. Carts left loaded in one place for weeks on soft wheels are the usual cause.
- Check swivel action. A swivel that has stiffened makes the cart fight direction changes and wander on straight runs.
- Listen. A caster that has become noisy has a bearing problem. Noise is the earliest free warning you get.
- Check the frame tracks true. Bent frames put wheels out of parallel, which adds resistance constantly. Push an empty cart and see if it pulls to one side.
- Clear debris from swivels and axles. Strapping, shrink wrap, thread and hair wind around axles and are a common cause of a suddenly stiff cart.
- Retorque caster mounting bolts. They loosen. A loose caster wobbles, wears unevenly and eventually shears.
- Replace casters in sets. One new caster among three worn ones changes the load distribution and wears out faster.
- Keep the bolt pattern on file. Record plate dimensions and hole spacing when you buy. It turns a future replacement from detective work into an order.
- Act on complaints. When someone says a cart is hard to push, that is data. It is also the cheapest ergonomics assessment you will ever get.
Common and costly mistakes
Nearly all of these are caster mistakes, which is the point of this guide.
Dividing the load by four
Three casters carry the load on a real floor. Divide by three, then add a safety factor. This one error under-rates casters by roughly 60%.
Forgetting the cart's own weight
Total loaded weight includes tare. A heavy steel truck is a meaningful fraction of its own rating.
Accepting whatever casters come standard
Standard casters are chosen to hit a price point on a catalog page, not to suit your floor, your load or your distances.
Putting hard wheels on a finished floor
Phenolic and cast iron mark epoxy and sealed concrete. The cart is cheaper than the floor repair.
Putting soft wheels in a hot area
Most polyurethane and rubber compounds are out well before 450°F. Give the actual temperature.
Choosing wheels too small
Small wheels are the most common reason a cart stops dead at a floor joint. Buy the biggest diameter the deck height allows.
Specifying wheel brakes when you meant total lock
A wheel brake still lets the swivel rotate. If the cart must not move at all, ask for total lock by name.
Four swivel casters for long straight runs
The cart wanders and the operator fights it the whole way. Use two rigid, or a six-wheel layout.
Loading heavy on the top shelf
Raises the centre of gravity on something that is about to be pushed around a corner. Heavy goes low.
Buying more carts to solve a push-force problem
If a cart is too hard to move, another one of the same will also be too hard to move. Diagnose first.
Treating carts as maintenance-free
Rolling resistance rises silently as wheels and bearings wear, and your people absorb the difference.
Frequently asked questions
What comes up most often on quote calls.
How do I work out what caster capacity I need?
Divide the total loaded weight, including the cart itself, by three rather than four, then add a safety factor of at least 20%. The formula is (W ÷ 3) × 1.2. You divide by three because on a real industrial floor one of the four casters is always unloaded due to uneven concrete and frame flex. A 3,000 lb cart therefore needs casters rated 1,200 lb each, not 750 lb.
Why divide by three when there are four casters?
Because concrete is never perfectly flat and frames flex. At any moment three casters carry the weight and the fourth floats, and which one floats changes as the cart moves. Designing to a four-way split means every caster spends much of its life overloaded, which is why they fail early and why the cart gets progressively harder to push as the wheels deform.
Which wheel material should I choose?
Start with the floor. Sealed, epoxy or finished floors need non-marking polyurethane or soft rubber. Then check temperature: above roughly 180°F most polyurethanes and rubbers are out and phenolic, rated to 450°F and above, is the answer. Then chemistry and washdown, which also drives you to sealed precision bearings. Capacity narrows the field last, and cast iron is rarely necessary outside foundries and heavy industrial work.
Does wheel size really make that much difference?
Yes, it is the most effective single change you can make to push effort. Larger wheels meet obstacles at a shallower angle, so they roll over thresholds and floor joints instead of stopping at them. 2″ to 3″ suits smooth floors and tight spaces but needs more force; 4″ to 5″ is the all-round default; 6″ and up reduces push force and front-edge impacts. The cost is deck height.
How much force should it take to push a cart?
Published ergonomics guidance puts the practical ceiling for starting a cart at about 50 pounds of force, roughly 220 newtons. Initial force is always higher than the force to keep it rolling. If people are putting a shoulder into it, the cart is overloaded, under-wheeled or worn. For a formal assessment, the Liberty Mutual tables, also called the Snook tables, give acceptable forces adjusted for population, distance and frequency.
What is a six-wheel cart for?
Two extra wheels in the centre let the cart pivot almost on the spot, giving a tighter turning radius than a four-wheel cart while still tracking straight over longer pushes. They also spread the load across more casters, which helps when you are near a caster's rating. In tight facilities with long aisles they are usually worth the extra cost.
Should I use swivel or rigid casters?
Four swivel moves in any direction and is best in congested areas, but it wanders over distance. Two swivel with two rigid tracks straight and steers from one end, which suits longer runs. Six-wheel with four swivel and two rigid gives you both. Choose by how far the cart travels in a straight line.
Is the published cart capacity per shelf or total?
Total, evenly distributed, unless it explicitly says otherwise. A cart rated 3,600 lbs across three shelves is not rated 3,600 lbs on the top shelf. Concentrated loads change the case, and loading heavy up high raises the centre of gravity on something that is about to be pushed around a corner. Load heavy on the bottom.
Flush shelf edges or a retaining lip?
Flush edges let you slide large items on and off without lifting over a rim. A retaining lip, typically around 1-1/2″, stops small parts sliding off in transit. Pick by whether your load is one big item or many small ones. Most cart families offer both, so decide at order time.
Do I need brakes?
Yes wherever the cart is loaded or unloaded by hand, parked on any slope, or used as a work surface. Ask specifically for total-lock brakes, which stop the wheel and the swivel. A plain wheel brake still lets the caster swivel, so the cart can still creep and rotate.
When should I look at powered carts instead?
When loads need two people to start, when push force stays too high even with correct wheels and bearings, when the same long run repeats many times a shift, when there are ramps, or when you have a claim history tied to material movement. Electric drive platform trucks remove the human push limit entirely. Before committing, check whether one bad floor joint is causing most of the effort, because fixing concrete is cheaper.
How often should carts be inspected?
Put it on a schedule rather than waiting for complaints, because rolling resistance rises silently as wheels flat-spot and bearings wear, and people absorb the difference without reporting it. Check for flat spots, cuts, stiff swivels, noise, debris wound round axles, loose mounting bolts, and whether an empty cart tracks straight. Replace casters in sets rather than one at a time.
Quick-reference spec table
Published figures and guidance referenced in this guide. Confirm the exact model before ordering.
| Item | Figure | Note |
|---|---|---|
| Capacity per caster | (Total weight ÷ 3) × 1.2 | Three casters carry the load; 20% is the minimum safety factor |
| Worked example | 3,000 lb cart → 1,200 lb per caster | Not 750 lb |
| Safety factor, light commercial | 15 to 20% | × 1.15 to 1.20 |
| Safety factor, warehouse picking | 20 to 30% | × 1.20 to 1.30 |
| Safety factor, transfer carts | 25 to 35% | × 1.25 to 1.35 |
| Safety factor, heavy industrial | 40 to 60% | × 1.40 to 1.60 |
| Safety factor, aerospace and defense | 50 to 100% | × 1.50 to 2.00 |
| Phenolic temperature rating | 450°F and above | The high-temperature option |
| Cast iron caster capacity | Up to 40,000 lb each | Will scar most floors |
| Wheel diameter, tight spaces | 2″ to 3″ | Smooth floors only; higher push force |
| Wheel diameter, general use | 4″ to 5″ | Best all-round for carts and benches |
| Wheel diameter, rough floors | 6″ and up | Reduces push force and front-edge impacts |
| Maximum force to start a cart | About 50 lbf (220 N) | Published ergonomics guidance; see Liberty Mutual / Snook tables |
| Product | Capacity | Construction | Casters |
|---|---|---|---|
| Little Giant 3-shelf 6-wheel steel cart 24″×48″ to 30″×72″, 36″ top shelf |
3,600 lb across three shelves |
12 gauge shelves, all-welded, gray powder coat. Flush edges or 1-1/2″ retaining lip. | 6″ × 2″ hard-tread phenolic 4 swivel + 2 rigid |
| Family | Brands carried | Primary job |
|---|---|---|
| Utility and service carts | Metro, Little Giant, Jamco, Strong Hold | Picking, parts retrieval, light transport |
| Shelf and stock trucks | Little Giant, Metro | Volume transport, 3″ to 12″ shelf depths |
| Box and bulk trucks | Little Giant | Loose or bulky material, solid or mesh sides |
| Platform and stake trucks | Little Giant, Jamco | Oversized and awkward loads |
| Electric drive platform trucks | Not listed | Beyond manual push capability |
| Tool and A-frame carts | Rousseau, Metro, Little Giant | Organised, secure mobile tooling |
| CNC tool carts | Rousseau NCW series | Machine shop tooling at the machine |
| Stainless and polymer carts | Metro, MetroMax, Eagle | Washdown, food, pharma, lab |
| Security and controlled access carts | Metro, Little Giant | Valuable inventory in transit |
| Sheet, panel, bar and pipe trucks | Little Giant | Long or flat stock without damage |
| Wire reel carts and caddies | Little Giant | Controlled pay-out of cable and hose |
| Cylinder trucks | Little Giant, MECO | Gas cylinders with chain restraints |
| Drum trucks and dollies | Little Giant | Tilting and moving full drums |
| Tilt trucks | Akro-Mils, Bayhead | Waste, scrap and chips, controlled dumping |
| Dollies | Various, steel / plastic / hardwood / fiberglass | Short moves in tight spaces |
| Pallet stands | Not listed | Raising pallets to working height |
| Replacement casters and components | Metro and others | Shelves, posts, dividers, casters |
Caster guidance above is industry practice, not a regulation, and the right safety factor depends on your floors, speeds and duty cycle. Ergonomic force figures are general guidance; use the Liberty Mutual tables for a formal assessment. Product figures are as published and subject to change. Tell us the load, the floor finish, the distance and the temperature and we will specify the casters with the cart.