The RM-Extreme series is the top tier of the RollMaster heavy-duty line, rated from 1500 kg per caster — the line’s extra heavy duty band with forged steel cores, paired with welded heavy-gauge brackets. The heavy-duty family line is specified to 2000 kg per caster; requirements above that are engineered per application, so state the true load in the RFQ and we confirm the configuration at quotation.
This is the series behind machinery moving, die carts and heavy equipment that sees shock loads and continuous duty. As across the line, every bracket is welded and load-tested on dynamic testing rigs before assembly, and wheel diameters run from 100 mm to 300 mm.
Process Overview
An extra heavy duty caster is defined by what survives shock: a forged steel wheel core, a welded heavy-gauge bracket and bearings sized for impact, not just for weight. The RM-Extreme series starts at 1500 kg per caster because below that band a lighter bracket line and a PU tread are usually the better economic choice.
The decision boundary is stated, not implied: the heavy-duty family line is specified to 2000 kg per caster, and requirements above that are engineered per application - wheel diameter, bearing type and bracket gauge are sized against the real load and duty cycle at quotation.
Casters by Load Range
| Series | Load per caster | Typical wheel options | Best for |
|---|---|---|---|
| RM-Light | up to 150 kg | Nylon, rubber, elastic | Light trolleys, medical and display carts |
| RM-Medium | 150–500 kg | Polyurethane, nylon | Warehouse carts, racks, AGV/AMR platforms |
| RM-Heavy | 500–1500 kg | Polyurethane on steel, forged steel | Die carts, machinery moving, heavy trolleys |
| RM-Extreme | 1500 kg and up | Forged steel, double wheel | Steel mills, ovens, extreme-load skates |
Specifications
- Load capacity from 1500 kg per caster (heavy-duty family line specified to 2000 kg; higher capacities engineered per application)
- Forged steel wheel cores; welded heavy-gauge steel brackets
- Zinc or powder-coated finish
- Precision ball or roller bearings, lubrication fittings as standard
- Speed rating ≤ 4 km/h; precision-bearing options rated to 8 km/h for continuous duty
- Dynamic load testing on every production batch
- ISO 9001 certified quality management; salt spray test chambers verify finishes before release
Finishes
Zinc plating, chrome plating, powder coating
| Bracket finish | What it does | Specify it when |
|---|---|---|
| Zinc plating (blue/white) | Baseline corrosion protection | Standard dry indoor use |
| Chrome plating | Hard, decorative, easy to clean | Visible / cleanroom-adjacent equipment |
| Powder coating | Custom color, good corrosion resistance | Brand colors, outdoor-adjacent use |
| Stainless steel 304 | No plating to fail | Washdown, food, medical |
| Stainless steel 316 | Resists chlorides | Salt, brine, marine air, harsh cleaning chemicals |
Testing
Wheel concentricity and bracket alignment per internal QC standard; load ratings based on EN 12530 testing protocols
| Selection factor | Rule of thumb | Effect on performance |
|---|---|---|
| Load sizing | Total load ÷ 3 (not ÷ 4) | On uneven floors only three wheels carry the cart |
| Wheel diameter | Bigger rolls easier | Larger wheels cut push force and bridge gaps |
| Tread hardness | Softer = quieter, harder = easier rolling | Pick the softest tread that carries the load |
| Bearing choice | Precision ball for manual pushing, roller for heavy loads | Bearings dominate rolling resistance at high load |
| Swivel vs rigid | 2 swivel + 2 rigid is the standard cart setup | All-swivel carts wander; all-rigid carts cannot steer |
| Floor condition | Rough floors need bigger wheels and softer treads | Small hard wheels on bad floors destroy both |
Surface Finish Reference
- Truck lock is zinc-plated, blue-passivated, Cr6-free.
- Guardrail systems must be smooth-surfaced.
- Connectors must have a corrosion-resistant finish.
- Stair rail systems must be smooth-surfaced.
- Surface roughness of Ra 0.8 µm or lower is specified for sealing, sliding, fatigue, or cleanliness mechanisms.
Materials We Machine
- Cast Iron/Steel
- Forged steel
- ductile steel
- polyurethane
- Ductile Iron Caster Wheel
Common Applications
- Automated Guided Vehicles
- Construction Equipment
- Factory
- Furnace Carts & Heat Equipment
- Heavy Platforms
- Industrial Carts
- Industrial Machinery
- Large Equipment
- Mold Transfer
- Oversized Goods Transport
- Rough or Uneven Surface
- Scaffolding
- Steel Fabrication Rigs
- Storage Racks
- Transport Cart
- Transport Platforms for Oversized Loads
- Warehouse Carts
- die cart
- manufacturing facilities
- rough outdoor surfaces
- smooth indoor hard floors
RM series comparison
| Series | Load per caster | Typical wheel materials | Temperature range |
|---|---|---|---|
| RM-Light | Up to 150 kg/caster | Polypropylene (PP), Cast nylon (PA6), TPR, Solid rubber | - |
| RM-Medium | 150–500 kg/caster | Polyurethane (PU) on steel core, Cast nylon (PA6), Steel | −20…+80 °C (std PU); −40…+120 °C (special PU) |
| RM-Heavy | 500–1500 kg/caster | Polyurethane (PU) on steel core, Cast nylon (PA6), Forged steel / pressed steel | −20…+80 °C (std PU); −40…+120 °C (special PU) |
| RM-Extreme (this series) | 1500 kg+/caster (family line specified to 2000 kg) | Forged steel | −20…+80 °C (std PU); −40…+120 °C (special PU) |
| RM-Hot | - | High-temp nylon, Phenolic resin, Cast iron, Forged steel | +120…+280 °C (tread options) |
Ordering, Lead Times & MOQ
Standard catalog items in small quantities; custom MOQ depends on tooling.
Standard lead time 15-30 days; samples faster.
Business models: OEM manufacturing, ODM design, private labelling, standard catalog sales, replacement parts supply.
Frequently asked questions
How high does the RM-Extreme rating go?
The series is defined from 1500 kg per caster, and the heavy-duty family line is specified to 2000 kg per caster. Above 2000 kg the configuration is engineered per application — wheel diameter, bearing type and bracket gauge are sized against the real load and duty cycle, so send the equipment weight and usage pattern with the RFQ and we confirm at quotation.
Forged steel or PU — which wheel for an RM-Extreme caster?
Forged steel maximises capacity and impact strength and tolerates high temperatures, but it is the harshest choice for floors. Where the floor must be protected, PU on a steel core is the load-bearing alternative within its temperature range (-20 °C to +80 °C standard, -40 °C to +120 °C special compounds). Bearing selection also bounds the temperature rating, so state the environment explicitly.
What should an RM-Extreme RFQ include?
Load per caster, wheel diameter and width, wheel material, top-plate dimensions and bolt pattern, brake requirement, operating environment and floor condition, expected daily duty, and any shock or impact loading. Drawings or the equipment weight breakdown speed up the quote.
What are the ordering terms?
Standard lead time is 15-20 days (custom configurations 30-40 days; engineered configurations are quoted individually). MOQ depends on tooling. Packing is individual box, master carton or palletized; samples are freight collect and refundable on a bulk order.
What is confirmed only at quotation on an RM-Extreme order?
Anything above the specified 2000 kg-per-caster line ceiling is engineered per application and confirmed at quotation, along with the rating of the exact wheel, bearing and bracket combination chosen. Material certificates, impact or duty-cycle test documentation and special forging requirements should be requested with the RFQ so they are part of the confirmed scope rather than assumed from the series band.
How do I calculate the required caster load capacity?
Total load = cart weight + payload. Divide by 3 (not 4) to stay safe on uneven floors. Add margin for speed, shock and rough floors.
What is the typical lead time?
Standard lead time 15-30 days. Samples faster than bulk orders. Confirmed at quotation.
What is the minimum order quantity?
Standard catalog items in small quantities. Custom casters depend on tooling. OEM/ODM/private label programs welcome.
What certifications do you hold?
ISO 9001 certified quality management. Load ratings based on EN 12530 testing protocols. In-house salt spray and dynamic load testing.
Can you manufacture under our brand?
OEM manufacturing, ODM design, private labelling. Custom brackets, compounds, colors and packaging. Samples then pilot then mass production.
Sources · 4
- promovecaster.comUnclassified source
- casterresource.comIndustry publication
- qualitycastersupply.comUnclassified source
- techincastor.comManufacturer technical documentation
Technical references cited for verifiability — not supplier recommendations.Browse the research library.
Related products
Related Knowledge
Capability commitments on this page are owner-confirmed (2026-09-29).