Why Choosing the Right Casters Matters for Dolly Performance

Key Takeaway: Caster selection directly determines dolly load capacity, manoeuvrability, floor protection and rolling efficiency. Improper selection leads to premature failure, floor damage and increased operator effort. Proper specification optimises performance while reducing total cost of ownership through extended service life and improved operational efficiency.

Critical Selection Factors: Load capacity ratings must exceed actual loads by a margin derived from the manufacturer’s own rating basis, since published ratings come from different tests and generic multipliers are not transferable between suppliers; wheel material must match floor surface characteristics to minimise damage and rolling resistance; the swivel-to-rigid caster ratio affects manoeuvrability and tracking stability; bearing type determines rolling efficiency and maintenance needs; and wheel diameter influences obstacle clearance according to mechanical advantage principles.

Critical Performance Impacts:

Undersized casters create point loads exceeding individual wheel ratings, accelerating wear and potentially causing failure during normal operations
Incompatible wheel and floor pairings increase rolling resistance while potentially damaging floor surfaces through indentation, marking or abrasion depending on material hardness
Low-quality bearings increase required pushing force substantially, contributing to operator fatigue and reduced efficiency
Insufficient swivel caster count reduces manoeuvrability in constrained spaces, requiring wider aisles and increasing positioning time
Insufficient wheel diameter limits the ability to clear common obstacles including floor expansion joints, door thresholds and operational debris

Additional Performance Benefits: Properly matched casters reduce operational noise on hard floors compared with incompatible combinations. Quality bearings with sealed designs reduce maintenance frequency against plain bore alternatives. Floor-compatible wheel materials eliminate refinishing costs. Premium casters provide service life typically several times longer than economy alternatives when properly selected for application conditions.

Next Steps: Calculate total dolly loads including maximum expected contents, identify floor surface types throughout intended operating areas, determine manoeuvrability requirements based on aisle dimensions and turn radius needs, select wheel materials using manufacturer floor compatibility charts, and establish per-caster capacity by dividing total load across the casters that will actually bear it, then agreeing the margin with the supplier against their stated rating basis.

Understanding Caster Performance Impact

Casters are the interface between dolly frame and floor surface, directly affecting functionality across multiple performance dimensions. The caster assembly, comprising wheel, bearing, mounting bracket and axle, determines load capacity, manoeuvrability, rolling resistance and service life. The industry standard covering vocabulary, performance and testing requirements for casters and wheels is ANSI ICWM-2018, published through the Institute of Caster and Wheel Manufacturers.

Load Support and Distribution

Each caster supports a portion of total equipment and cargo weight, distributing load through wheel contact patches to the floor. The fundamental principle is that combined caster capacity must exceed total expected weight with adequate safety margin.

Load capacity fundamentals. Total dolly load, meaning equipment plus maximum cargo, divided by the number of casters equals the theoretical individual caster load requirement. Manufacturers specify load ratings under standardised test conditions. Static load capacity represents the weight a caster can support when stationary; dynamic load capacity indicates rolling capacity.

According to manufacturer specifications, dynamic ratings commonly range from 50 to 90 percent of static ratings depending on speed, floor condition, bearing type and wheel diameter. Higher speeds, rougher surfaces and smaller wheels push effective capacity toward the lower end of that range.

There is no single safety factor that applies across suppliers, and the reason is worth knowing before you adopt anyone’s figure. Every capacity rating is established under stated test conditions, and those conditions differ. One manufacturer rates for intermittent operation on smooth floors below 3 mph with no shock loading. Dynamic testing under the ICWM caster and wheel standard runs at 3 mph for 8 hours a day. ANSI MH31.1 dynamometer testing runs at 4 mph on a smooth floor. A static rating may be a one-hour compression hold. Because the baselines differ, so does the correction you need, and published supplier guidance for the same cart ranges from adding 20 percent to applying four times the dynamic rating.

A multiplier borrowed from one supplier and applied to another supplier’s number is therefore not conservative. It is arbitrary, and it can be arbitrary in either direction.

Worked example, showing the arithmetic rather than the multiplier. A dolly carrying 1,000 pounds of cargo plus 100 pounds of equipment weight gives 1,100 pounds total. Divided across four casters that is 275 pounds each, assuming even distribution and all four in contact with the floor. Neither assumption survives a real floor, which is why many buyers size on three casters rather than four: 1,100 ÷ 3 gives 367 pounds each, a 33 percent increase before any safety factor is considered.

Take that 367 pound figure to your caster supplier along with your floor condition, travel speed, duty cycle and whether the platform ever takes an impact. Ask what their rating assumes and what their selection method adds for each departure. The number you end up with is defensible because you can say where it came from.

Select the next available capacity rating meeting or exceeding that value from the manufacturer’s specifications.

Mobility and Rolling Resistance

Casters enable movement by converting sliding friction to rolling friction. Rolling resistance, the force needed to maintain constant velocity, depends on wheel material, bearing quality, floor surface and load magnitude. Where you need comparable numbers rather than a qualitative ranking, ask the manufacturer which test method produced their published rolling resistance figures, and whether those figures were obtained on a floor surface resembling yours.

Wheel material hardness influences contact patch deformation. Harder wheels such as nylon and phenolic create smaller contact patches with lower rolling resistance on smooth, hard floors. Softer wheels such as rubber and soft polyurethane deform more under load, increasing rolling resistance but providing floor protection and shock absorption.

Bearing type significantly impacts efficiency. Sealed ball bearings reduce internal friction compared with plain bore wheels using simple bushings. Precision bearings maintain tighter tolerances, reducing energy loss during operation.

Wheel diameter affects mechanical advantage when traversing obstacles. The relationship approximates:

Climbing force ≈ Load × (Obstacle height ÷ Wheel radius)

This simplified formula does not account for surface friction, hysteresis or wheel deformation losses. As a practical guideline following the principle, a 6-inch diameter wheel requires approximately half the force to surmount a given obstacle compared with a 3-inch wheel under similar load.

Directional Control and Manoeuvrability

The configuration of swivel against rigid casters determines equipment manoeuvrability and tracking characteristics. Swivel casters rotate 360 degrees around vertical kingpins, enabling direction changes. Rigid casters maintain fixed orientation, providing directional stability.

Four-wheel dollies typically use two swivel and two rigid casters. Common arrangements include swivel casters at one end for improved straight-line tracking, or diagonal swivel placement for enhanced manoeuvrability in tight spaces. All-swivel configurations maximise manoeuvrability but reduce straight-line tracking stability.

Swivel caster offset, the horizontal distance between kingpin centre and wheel centre, affects turning radius and steering responsiveness. Larger offsets create more stable straight-line tracking but require greater force to initiate turns. Smaller offsets enable easier direction changes but may cause unwanted course deviation.

Wheel Material Selection for Floor Compatibility

Wheel material selection balances load capacity, floor protection, rolling resistance and environmental conditions. Different materials exhibit distinct characteristics across those dimensions.

Polyurethane Wheels

Polyurethane is the versatile choice for general material handling. Cast polyurethane wheels combine non-marking properties, moderate load capacity and reasonable floor protection.

Performance characteristics. Polyurethane hardness typically ranges from 70A, which is softer and more floor-protective, to 95A durometer, which is harder with lower rolling resistance on smooth floors. Mid-range hardness at 80 to 85A provides balanced performance across varied floor types. Polyurethane resists oil, grease and most chemicals while maintaining good abrasion resistance.

Temperature limits for standard polyester-based cast polyurethane formulations typically range from 20°F to 180°F according to manufacturer specifications (Colson Group, 2023; Hamilton Caster, 2024). Ether-based formulations extend low-temperature performance, while thermoplastic polyurethane varieties offer different property profiles. Load capacity generally ranges from light-duty at 50 to 200 pounds per wheel through heavy-duty at 400 to 1,200 pounds per wheel, depending on wheel diameter, width and core reinforcement.

Polyurethane wheels suit smooth concrete, tile, vinyl and wood floors without marking under appropriate loading. The material maintains good impact resistance and quiet operation compared with harder alternatives.

Rubber Wheels

Rubber wheels provide maximum floor protection and shock absorption with softer durometer ratings than polyurethane alternatives. Natural and synthetic rubber formulations offer different performance characteristics.

Soft rubber wheels at 40 to 60A durometer protect delicate floor surfaces including finished wood, polished stone and decorative surfaces. The soft contact patch distributes load while absorbing vibration and impact. Rolling resistance increases significantly on hard floors compared with harder wheel materials, requiring greater pushing force.

Rubber wheels excel where noise reduction matters, with soft rubber damping vibration effectively. Load capacity limitations typically restrict rubber wheels to light and medium-duty applications under 300 pounds per wheel according to common manufacturer specifications. Heavy loads cause excessive deflection, accelerating wear and increasing rolling resistance. Temperature resistance varies by compound but generally limits standard rubber wheels to ambient indoor conditions.

Nylon Wheels

Hard nylon wheels, cast or injection-moulded, provide high load capacity with minimal maintenance. Nylon’s rigid structure and smooth surface create very low rolling resistance on hard, smooth floors.

Nylon wheels handle heavy loads efficiently, with capacities often exceeding 1,000 pounds per wheel depending on diameter and construction. The material’s hardness, approximately 70 to 80 Shore D, provides excellent wear resistance and long service life under demanding conditions.

Rolling resistance reaches minimum levels on smooth concrete or epoxy-coated floors where nylon’s hardness prevents deformation. That same hardness generates higher noise levels on hard floors and transmits vibration directly to equipment frames. Nylon wheels may scratch or abrade softer floors and lack the shock-absorbing properties of elastomeric alternatives.

Chemical resistance makes nylon suitable for environments with oil, grease or mild chemical exposure. Temperature tolerance extends from negative 40°F to over 200°F depending on the specific formulation. Applications include heavy-duty industrial carts, automotive service equipment and manufacturing transport systems where load capacity and durability outweigh noise and floor protection concerns.

Phenolic Wheels

Phenolic resin wheels offer extreme durability and heat resistance for demanding industrial applications. The hard, dense material withstands abrasive conditions and heavy loads.

Phenolic wheels resist wear in harsh environments including foundries, steel mills and heavy manufacturing where abrasive debris and impact loading destroy softer wheel materials. Heat resistance typically ranges from 250°F to 475°F depending on resin formulation and filler type, enabling use near ovens, furnaces and hot processing equipment according to manufacturer specifications (Blickle, 2023).

Load capacities rival or exceed nylon wheels while maintaining dimensional stability under sustained loading. The extremely hard surface generates significant noise on hard floors and provides no floor protection, making phenolic suitable for concrete floors in industrial settings where floor damage concerns are minimal.

Chemical resistance to oils, solvents and most acids makes phenolic appropriate for chemical processing and heavy industrial environments. The material’s brittleness may cause cracking under severe impact, requiring periodic inspection in demanding service.

Floor-Material Compatibility Guidelines

Floor-material compatibility follows predictable patterns based on floor hardness and sensitivity. Following manufacturer compatibility charts (Colson Group, 2023; Hamilton Caster, 2024):

Soft floors such as wood, vinyl and tile: select rubber or soft polyurethane at 70 to 80A for maximum protection
Hard floors such as concrete and epoxy: hard polyurethane at 85A+, nylon, or phenolic offer lower rolling resistance on smooth surfaces
Temperature extremes: nylon or phenolic for temperatures beyond polyurethane limits
Chemical exposure: match wheel material to specific chemicals according to manufacturer chemical resistance data

Bearing Types and Rolling Efficiency

Bearing quality substantially affects rolling resistance, maintenance requirements and service life.

Plain Bore Bearings

Plain bore wheels use simple sleeve bearings or direct wheel-to-axle contact without precision bearing components. This construction minimises initial cost but increases rolling resistance and maintenance needs.

Rolling resistance in plain bore wheels substantially exceeds precision bearing alternatives due to increased friction between axle and wheel bore. The sliding contact generates heat and wear, requiring periodic lubrication according to manufacturer maintenance schedules. Under continuous use, bore wear increases clearance between wheel and axle, creating play that accelerates wear and generates noise.

Load capacity limits for plain bore construction typically restrict applications to light-duty service. Appropriate applications include occasional-use equipment, very light loads, and cost-sensitive purchases where low initial cost outweighs operational efficiency.

Roller Bearings

Roller bearings distribute loads across cylindrical rolling elements, providing good load capacity with moderate rolling resistance. The rolling contact between inner race, outer race and rollers reduces friction compared with plain bore designs.

Roller bearings handle radial loads effectively by spreading forces across multiple roller elements. Load capacity typically exceeds comparably sized ball bearings due to the longer contact line between rollers and races. However, roller bearings provide limited axial thrust load capacity, which may restrict applications requiring side-loading resistance.

Rolling resistance falls between plain bore and precision ball bearings. Maintenance requirements decrease compared with plain bore designs through sealed bearing construction protecting against contaminants.

Precision Ball Bearings

Sealed precision ball bearings provide minimum rolling resistance with excellent load capacity and long service life. Ball bearings use precisely manufactured steel balls rolling between inner and outer races, creating point contact with minimal friction.

Rolling resistance reaches minimum levels with precision ball bearings due to point contact geometry and precision manufacturing tolerances. Sealed designs incorporate shields or seals preventing contamination while retaining lubricant, eliminating maintenance requirements while extending service life.

The initial cost premium for precision ball bearing casters compared with plain bore or roller bearing alternatives typically provides return through reduced operating costs, lower rolling resistance and extended service life when properly sized for the application.

Mounting Systems and Installation

Caster mounting methods determine installation complexity, load transfer characteristics and replacement procedures.

Plate Mount Casters

Top plate mounting provides secure and stable installation for equipment with flat mounting surfaces. A flat steel or aluminium plate with four mounting holes bolts to the equipment frame or base.

Plate-mounted casters distribute loads across four mounting points, providing excellent stability and load transfer. Proper installation requires flat, rigid mounting surfaces with adequate thickness to prevent flexing under load. Mounting hole spacing follows standard patterns, typically 2.5-inch to 4-inch square patterns depending on caster size.

Fastener selection affects installation security. Through-bolts with lock washers and nuts provide maximum strength for heavy-duty applications. Mounting surface preparation improves installation quality, since clean, flat surfaces without rust, paint buildup or irregularities ensure proper load distribution.

Stem Mount Casters

Stem-mounted casters use round or threaded stems inserting into holes or sockets in equipment frames, simplifying installation where plate mounting is impractical.

Grip ring stems feature circumferential grooves cut into hollow steel stems. Driven into drilled holes matching stem diameter, the stem compresses and the grooves grip the hole walls, providing adequate retention for light to medium-duty applications.

Threaded stems screw into threaded inserts or sockets, providing more secure retention than grip ring designs. Proper thread engagement, a minimum of 1.5 times stem diameter per engineering practice, ensures adequate strength.

Installation requires precisely sized holes drilled perpendicular to mounting surfaces. Undersized holes prevent full stem insertion; oversized holes compromise grip.

Caster Configuration for Optimal Performance

Two-Swivel, Two-Rigid Configuration

The most common four-wheel configuration combines two swivel casters with two rigid casters for balanced performance. Placement options include swivels at one end or diagonal positioning.

End-placement swivels. Positioning both swivel casters at one end, typically where pushing occurs, provides good manoeuvrability while maintaining directional stability. The swivel end enables direction changes while the rigid end provides straight-line tracking. This configuration suits dollies moved primarily in straight paths with occasional turns.

Diagonal swivels. Diagonally placed swivel casters at opposite corners maximise manoeuvrability in constrained spaces, enabling rotation around the equipment centre with a relatively small turning radius. Applications requiring frequent direction changes in tight aisles benefit from this arrangement. Straight-line tracking decreases compared with end-placement configurations, because two swivel casters at different ends both influence direction and may require more operator attention.

All-Swivel Configuration

Four-swivel configurations provide maximum manoeuvrability, enabling rotation in place and unrestricted direction changes. Straight-line stability decreases significantly.

All-swivel casters suit applications requiring frequent rotation or positioning in tight spaces where manoeuvrability outweighs tracking stability. Light-duty equipment in constrained environments benefits from unrestricted mobility.

Straight-line tracking challenges increase substantially. The equipment tends to veer or wander, requiring constant operator correction. Floor levelness becomes critical, since any floor slope causes the equipment to roll unpredictably.

Heavy Equipment Configurations

Equipment exceeding 2,000 to 3,000 pounds total load often employs six or more casters for adequate load distribution.

Six-caster configurations typically use four swivel and two rigid casters, or other combinations balancing manoeuvrability with stability. Eight-caster arrangements suit very heavy equipment, reducing individual caster loading while improving weight distribution.

Caster placement spacing affects load distribution. Evenly spaced casters share loads more uniformly than concentrated clusters. Load concentration at casters positioned under heavy components may require locally increased capacity to handle uneven weight distribution.

Calculating Required Load Capacity

Total Load Determination

Calculate total equipment load by adding equipment empty weight to maximum anticipated cargo weight, including all permanently mounted attachments.

Weight distribution considerations. Equipment design affects weight distribution. Three-point contact situations occur when equipment rests unevenly or encounters uneven floors, where one caster carries no load while the remaining casters support increased proportions. This is a common occurrence and requires capacity margin sufficient to support the load when it redistributes.

Safety Factor Application

The factor you apply belongs to the supplier whose rating you are applying it to. Rather than reproducing a generic table, here is what to establish before you specify, in order.

First, the rating basis. Ask which test produced the published number, at what speed, on what floor surface, for what duty cycle, and whether shock loading is included or excluded. A number from a one-hour static compression hold and a number from an 8-hour rolling endurance test are not interchangeable, even for the same caster.

Second, your departures from that basis. Write them down specifically: floor condition and any cracks, joints, dock plates or drain slopes; travel speed; hours per day; ambient temperature; and whether anything is ever dropped onto the platform rather than placed on it.

Third, the supplier’s own correction for each departure. They have a selection method, and it is calibrated to their rating rather than to a competitor’s. This is the step that gets skipped, and it is the only one that makes the final number defensible.

Fourth, the distribution assumption. Dividing total load by the number of casters assumes all of them are bearing and that the load is centred. Neither holds on a real floor, which is why many buyers size on three casters for a four-caster cart. That single choice raises the per-caster figure by 33 percent, more than most of the multipliers it would be stacked with.

Worked example. A 1,200 pound total load on a four-caster dolly gives 300 pounds per caster if all four bear evenly. Sized on the three-caster assumption it is 400 pounds per caster. That 400 pound figure, together with your floor and duty description, is what goes to the supplier. What comes back is a recommended capacity you can cite a reason for, and it may be above or below what a borrowed multiplier would have produced.

Select the next available capacity rating meeting or exceeding the figure you and the supplier arrive at. Where the calculation lands between two standard sizes, go up.

Maintenance and Service Life

Inspection and Maintenance

Regular caster inspection identifies developing problems before they cause equipment failure. Inspection intervals depend on usage intensity: monthly for occasional-use equipment, weekly or daily for heavy-duty operations according to manufacturer maintenance recommendations.

Inspection points:

Wheel condition: check for flat spots, tears in elastomeric wheels, cracks in hard wheels
Bearing functionality: rotate wheels manually, sensing resistance or roughness
Mounting security: verify fasteners remain tight and mounting plates sit flush
Swivel action: confirm swivel casters rotate freely without binding or excessive play

Lubrication Requirements

Sealed bearing casters require no lubrication according to manufacturer sealed bearing specifications. Open precision bearings benefit from periodic lubrication, annually or semi-annually, with appropriate grease. Plain bore wheels require more frequent lubrication, potentially monthly under continuous use.

Replacement Indicators

Wheel wear reducing diameter substantially according to manufacturer guidelines, affecting performance
Bearing failure symptoms including rough operation, excessive play or wheel wobble, requiring immediate replacement
Mounting damage including cracked plates, elongated mounting holes or bent stems compromising load transfer
Frame damage on casters including bent forks, cracked housings or deformed brackets

Service life varies significantly based on usage intensity, load levels, floor conditions and caster quality. Premium casters with precision bearings typically provide service life several times longer than economy alternatives when properly specified.

Frequently Asked Questions

How do I determine the right load capacity for my dollies?

Calculate total equipment weight plus maximum cargo, then divide it across the casters that will actually be bearing. On an uneven floor that is three of four, not four of four, so dividing by three rather than four is the realistic figure and it raises the per-caster load by 33 percent on its own.

For the margin above that figure, go to the manufacturer rather than to a generic multiplier. Published capacity ratings are established under different test conditions by different suppliers, some at 3 mph on smooth floors with no shock loading, others under rolling endurance or dynamometer tests, and supplier guidance on what to add ranges from 20 percent to several times the rating. A multiplier taken from one supplier and applied to another’s number is not conservative, it is arbitrary. Ask what conditions their rating assumes, describe how yours differ, and use the allowance their own selection method gives. Then select casters at or above that requirement, rounding up where the calculation falls between standard sizes.

What wheel material works best for different floor types?

Select based on floor surface characteristics, following manufacturer compatibility charts. Soft floors such as finished wood, vinyl, tile and polished surfaces require rubber or soft polyurethane at 70 to 80A durometer for maximum protection. Hard floors such as concrete and industrial epoxy accommodate hard polyurethane at 85 to 95A, nylon, or phenolic, all offering lower rolling resistance on smooth surfaces. Match wheel hardness inversely to floor sensitivity: softer wheels for delicate floors, harder wheels for durable industrial floors.

Should I use all swivel casters or a combination with rigid casters?

Combination configurations, typically two swivel and two rigid, provide balanced performance for most applications, offering manoeuvrability with directional stability. All-swivel configurations maximise manoeuvrability in tight spaces but sacrifice straight-line tracking, which can prove difficult to control under heavy loads or on sloped floors. Select based on operational requirements: constrained spaces with frequent repositioning favour more swivel casters, while long straight travel paths favour more rigid casters.

How often should casters be replaced?

Replacement intervals vary based on usage intensity, load levels, floor conditions and caster quality. Inspect regularly according to manufacturer maintenance schedules for wheel wear, bearing degradation, mounting looseness or frame damage. Replace when performance deteriorates significantly or safety concerns arise. Service life ranges from months in demanding applications to years in light-duty service, with quality casters providing service life typically several times longer when properly specified.

Do larger wheels perform better than smaller wheels?

Larger wheels provide advantages in obstacle clearance, following the mechanical advantage principle where a larger radius reduces the climbing force required; improved weight distribution reducing floor pressure; and potentially longer service life with more material available for wear. However, larger wheels increase cost and require greater mounting height. Select diameter based on floor conditions and obstacle clearance requirements, since smoother floors with minimal obstacles accommodate smaller wheels while rougher surfaces or obstacles justify larger diameters.

What causes excessive noise from casters?

Hard wheels on hard floors generate significant noise through vibration transmission. Worn bearings create grinding or rumbling sounds. Loose mountings allow rattling and impact noise. Flat-spotted wheels produce rhythmic thumping. Debris trapped in wheels or bearings causes clicking or scraping. Address noise by selecting softer wheels for hard floors according to manufacturer compatibility guidance, replacing worn bearings, tightening mounting hardware, replacing damaged wheels, and cleaning debris from wheel-bearing assemblies.

Can I mix different caster types on the same equipment?

Mixing different load capacities, wheel materials or bearing types on the same equipment generally creates performance problems. Unequal load capacities cause overloaded casters to fail prematurely while underloaded casters carry minimal weight. Different wheel materials create inconsistent rolling resistance, causing equipment to pull toward the higher-resistance wheels. Use matched sets of identical casters for predictable, balanced performance. Intentional mixing of swivel and rigid casters for directional control is standard practice and a different matter entirely.

How do I prevent casters from marking floors?

Select non-marking wheel materials including polyurethane or rubber rather than nylon, phenolic or metal wheels, according to manufacturer floor compatibility data. Ensure wheel material matches floor type, following the rule that wheel hardness runs inversely to floor sensitivity. Maintain casters properly to prevent flat spots that concentrate forces. Avoid overloading beyond rated capacity. Keep wheels clean and free of debris that could embed and transfer to floors. Softer wheels at 70 to 80A durometer minimise marking on most floor types.

What maintenance do sealed bearing casters require?

Sealed bearing casters require minimal maintenance compared with open bearing designs. The sealed construction prevents contamination and retains lubrication throughout service life. Routine maintenance includes inspecting mounting security, checking wheel condition, verifying bearing smoothness through manual rotation, and cleaning debris from wheel treads. Sealed bearings cannot be serviced or re-lubricated, so replace the caster when bearings fail or wheels wear excessively.

Are more expensive casters worth the investment?

Premium casters typically provide longer service life, better rolling efficiency, reduced maintenance requirements and superior load capacity compared with economy alternatives. The initial cost premium often returns through extended replacement intervals, reduced operational effort from lower rolling resistance, decreased maintenance labour and fewer equipment failures. For regular-use applications, quality casters prove cost-effective. Occasional-use equipment may function adequately with economy casters where low initial cost outweighs performance advantages.

Table 1: Floor-Material Compatibility Reference

Floor type	Recommended wheel material	Durometer range	Primary benefit	Temperature range
Finished wood, vinyl, tile	Soft rubber or soft polyurethane	70 to 80A	Maximum floor protection	20 to 180°F (polyurethane)
Polished stone, decorative	Soft polyurethane	75 to 85A	Floor protection with moderate load capacity	20 to 180°F
Smooth concrete, epoxy	Hard polyurethane	85 to 95A	Lower rolling resistance, good load capacity	20 to 180°F
Industrial concrete	Nylon	70 to 80 Shore D	Maximum load capacity, wear resistance	negative 40 to 200°F+
High-temperature environments	Phenolic	n/a	Heat resistance	Up to 475°F
Chemical exposure	Consult chemical resistance data	Varies	Chemical compatibility	Application-dependent

Temperature ranges and compatibility guidelines based on manufacturer specifications (Colson Group, 2023; Hamilton Caster, 2024; Blickle, 2023). Always consult the specific manufacturer’s compatibility chart for detailed application guidance.

Worksheet 1: Load Capacity Calculation

Step 1, determine total load

Equipment empty weight: lbs

Maximum cargo weight: lbs
Total load: lbs

Step 2, calculate individual caster load

Total load ÷ number of casters = lbs per caster (even distribution, all casters bearing)
Total load ÷ (number of casters minus one) = lbs per caster (three-point contact assumption)

Which one you use is a decision to record, not a detail. On uneven floors the second is the realistic figure

Step 3, establish the rating basis and the margin with your supplier

Record the answers rather than assuming them:

Rating type and test conditions behind the published number:
Speed, floor surface and duty cycle the rating assumes:

Is shock loading included in that rating?
Your departures from it, listed:

The supplier’s recommended allowance for those departures:
Resulting minimum capacity per caster: _ lbs

Step 4, select caster

Choose a caster with a capacity rating at or above the figure from Step 3
Where the requirement falls between two standard capacities, go up
Confirm which rating you are comparing against, since static, dynamic and shock ratings for the same caster are different numbers produced by different tests

References

Standards

Institute of Caster and Wheel Manufacturers. (2018). ANSI ICWM-2018: Vocabulary, Performance and Testing Requirements for Casters and Wheels. Charlotte, NC: ICWM.

ANSI ICWM-2018 is the industry standard covering vocabulary, performance and testing requirements for casters and wheels. This guide cites it for that scope only. Where a specific numeric threshold in your specification needs to rest on a published test method, confirm with the manufacturer which method their figure came from rather than assuming a standard covers it.

Manufacturer technical documentation

Colson Group USA. (2023). Industrial Caster Technical Catalog 2023. Jonesboro, AR: Colson Group.
Hamilton Caster & Manufacturing Company. (2024). Caster Selection and Specification Guide. Hamilton, OH: Hamilton Caster.
Blickle North America. (2023). Technical Handbook: Wheels and Casters. Mississauga, ON: Blickle.

A note on the figures in this guide

Load capacities, durometer ranges, temperature limits and service life figures are typical published ranges drawn from the manufacturer documentation cited above, and vary between product lines. Safety factor recommendations reflect common engineering practice rather than a single mandated value. Where a figure will set a purchase specification or a load limit, confirm it against the manufacturer’s published data for the actual caster, and verify the current edition of any standard with its publishing body.