Korean Extra Heavy Duty Shock Absorbing Caster Cast Iron Pu Wheel350kg Cnc

6" A02 Single Spring Shock Absorbing Caster | Red Iron Core PU | 350kg | Galvanized Bracket</title>

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6" A02 Single Spring Shock Absorbing Caster — Red Cast Iron Core PU Wheel, Galvanized Bracket, 350 kg

Breadcrumb: Home / Heavy Duty Casters / A02 Korean Style Series / 6 Inch (150mm)

The A02 Series is our Korean-style heavy duty shock absorbing caster: protect the equipment above while the wheel below rolls over rough floors.

This 6 inch (150 mm) model combines:

• a RED CAST IRON CORE PU wheel (polyurethane tread cast directly onto a solid iron hub), Shore A 95-98
• a GALVANIZED STEEL BRACKET with a built-in SINGLE COMPRESSION SPRING
• a 6203 precision ball bearing for low rolling resistance

The single spring is pre-loaded between the top plate and the yoke. When the wheel hits a floor joint, threshold or chip pile, the spring compresses vertically and absorbs the impact before it reaches the machine frame.

The 6 inch is the heavy-duty workhorse of the A02 family: 196 mm installed height, 350 kg per wheel (approx. 1,400 kg on a 4-wheel set). It is the default choice for machines that are genuinely heavy or that run on rough, chip-covered concrete — CNC routers, EDM machines, scissor lift tables, air compressors and steel-handling equipment.

Common search terms covered: 6 inch single spring caster, A02 shock absorbing caster, red iron core PU wheel galvanized bracket, CNC router caster, scissor lift table caster, air compressor caster, Korean style heavy duty caster, Shore A 95-98 PU wheel, 6203 bearing caster.

Series : A02 (Korean Style / 韩式)
Wheel material : Cast Polyurethane (PU) on Cast Iron Core — RED
Wheel hardness : Shore A 95 – 98
Wheel diameter : 150 mm (6 inch)
Wheel width : 50 mm
Iron core : Solid cast iron, red painted
Bearing : 6203 (precision deep groove ball bearing)
Bracket / yoke : Pressed steel, hot-dip galvanized, 5.0 mm thickness
Top plate : 158 × 115 mm, 5.0 mm thickness
Bolt hole spacing : 130 × 73 mm
Bolt hole dia. : 13 mm
Overall height : 196 mm
Load capacity : 350 kg / wheel (system ≈ 1,400 kg, 4-wheel set)

Mounting options : Rigid (Fixed) · Swivel · Swivel with Brake · Central Hole
Temperature range: -20 °C to +80 °C (standard PU; short peak +100 °C)
Floor fit : Concrete, painted steel, epoxy, PVC tile — indoor dry use

[1] RED CAST IRON CORE PU WHEEL — Shore A 95-98

• Polyurethane is CAST (poured liquid) onto the iron hub, not glued. The bond is permanent — the tread can never delaminate under load.
• Shore A 95-98 is the upper end of the industrial hardness scale:
  • highly resistant to cutting, chunking and wear from metal chips
  • non-marking on epoxy, painted and PVC floors
  • oil, grease and most solvent resistant
• RED colour = visual wear indicator: when the black iron core shows through the red tread, replace before failure.
• Cast iron core = zero radial deformation, superior heat dissipation versus aluminium, rigid centre keeps the 6203 bearing aligned.

[2] GALVANIZED STEEL BRACKET (5.0 mm pressed steel)

• Hot-dip galvanized coating protects against rust and corrosion far better than painted brackets (paint chips; zinc does not).
• 5.0 mm plate for top plate and yoke = high structural strength, resists bending under off-centre shock loads.
• Clean bright industrial finish, visually matched to the red wheel.

[3] SINGLE SPRING SHOCK ABSORPTION (A02 defining feature)

• A single heavy-duty coil spring is pre-loaded inside the bracket, between the top plate and the yoke.
• On floor joints, thresholds, chip piles and uneven slabs the spring compresses VERTICALLY and cushions the impact before it reaches:
  • CNC spindles and linear guides
  • EDM power supplies and dielectric tanks
  • scissor-lift hydraulics and load platforms
  • air-compressor pumps and receivers
  • the operator pushing the trolley
• Quieter operation, less floor marking, longer bearing life, lower pushing effort, equipment protection.

⚠ Honest note (builds trust, reduces returns):
The SINGLE SPRING provides VERTICAL shock absorption.
- Need side-thrust / anti-side-shock? → DOUBLE SPRING series.
- High-speed towing / continuous dynamic load? → Contact us to select the correct spring rate (spring stiffness).

[4] 6203 PRECISION BALL BEARING

• 6203 ZZ sealed deep-groove ball bearing, common and serviceable.
• Low rolling resistance → lower push/pull force → less fatigue.
• Standard size → easy, low-cost field replacement.

The 6" is the heavy-duty workhorse of the A02 family. 196 mm installed height, 350 kg/wheel (≈ 1,400 kg system) and a 150 mm contact patch let it survive metal-chip floors, threshold ramps and long push distances.

★ CNC & MACHINING (heavy)

• 3-axis / 4-axis CNC router (1325, 1530, 2030) — wood, aluminium, plastic
• CNC machining centre / VMC auxiliary stand
• EDM machine base (wire EDM, sinker EDM, dielectric tank trolley)
• Surface grinder, cylindrical grinder dolly
• Large milling machine, gantry milling machine base

★ LIFTING & HANDLING

• Scissor lift table, hydraulic lift cart, manual stacker base
• Pallet dolly, steel coil cart, sheet-metal handling trolley
• Air-powered lifting platform, loading dock leveller trolley

★ AIR & FLUID POWER

• Screw air compressor skid / receiver tank trolley
• Vacuum pump, industrial vacuum tank trolley
• Hydraulic power unit (HPU) dolly

★ INJECTION MOLDING & PLASTICS

• Injection molding machine 200–500T auxiliary platform
• Mold exchange cart, material hopper / dryer trolley
• Granulator, mixer, conveyor base

★ STEEL & METAL FABRICATION

• Steel plate handling cart, welding positioner base
• Roll cage trolley, heavy fabrication fixture dolly

★ PRINTING & CONVERTING

• Large-format printing machine stand, laminating machine dolly
• Roll-paper / film converting machine trolley

★ WAREHOUSE & MAINTENANCE

• Heavy-duty maintenance trolley, MRO cart
• Diesel generator set base (small), transformer trolley

WHY 6 INCH:
Maximum contact patch and lowest wheel deformation at 350 kg. Rolls over metal chips, threshold ramps and expansion joints that would stop a 4" or 5". The single spring is most effective here, where heavy machines generate the strongest floor shocks. Default choice for CNC routers, EDM, scissor lifts, compressors and steel-handling equipment.

• 350 kg/wheel is the highest rating in the standard A02 range
• 196 mm installed height still fits most machine bases
• Best obstacle clearance — rolls over chips and joints easily
• Largest contact patch = lowest ground pressure, least floor marking
• The single spring does the most useful work at this load
• → When the machine is genuinely heavy or the floor is rough, choose the 6".

1. Single spring shock absorption built into galvanized bracket
2. Red cast iron core PU wheel — Shore A 95-98, non-marking
3. Cast PU permanently bonded to iron core (no delamination)
4. Hot-dip galvanized 5.0 mm steel bracket — rust resistant
5. 6203 precision ball bearing — smooth roll, low push force
6. Rigid / Swivel / Swivel+Brake / Central Hole options
7. Load capacity 350 kg / wheel (≈ 1,400 kg system)
8. Red tread = visual wear indicator
9. Oil, grease and solvent resistant tread
10. Quiet operation, floor protective
11. Standard 6203 bearing — easy field replacement
12. OEM/ODM customization available

The A02 6 inch single spring shock absorbing caster is the heavy-duty workhorse of the series, built for machines that are genuinely heavy or run on rough concrete. It combines a red cast iron core polyurethane wheel (Shore A 95-98), a galvanized steel bracket with integrated coil spring, and a 6203 precision bearing. Typical applications include 3-axis and 4-axis CNC routers (1325 / 1530 / 2030) for wood, aluminium and plastic, CNC machining centres, wire and sinker EDM machines, surface and cylindrical grinders, scissor lift tables, hydraulic lift carts, pallet dollies, steel coil carts, screw air compressors, vacuum pumps, injection molding machines (200–500T) and their mold-exchange and dryer trolleys, steel plate handling carts, welding positioners, large-format printing machines, laminating machines and heavy maintenance trolleys. The iron core carries the load with zero radial deformation; the high-hardness PU tread survives metal chips while staying non-marking on epoxy and painted floors; the single spring absorbs impacts from floor joints and thresholds so vibration never reaches the machine frame. Rated 350 kg per wheel, approx. 1,400 kg system on a 4-wheel set.

Q1: What machines use the 6 inch 350 kg A02?
A: CNC routers (1325/1530/2030), EDM machines, surface grinders, scissor lift tables, screw air compressors, steel coil carts, injection molding auxiliaries and heavy maintenance trolleys.

Q2: Why pick 6" over 5" if both can carry my machine?
A: The 6" has a larger contact patch and better obstacle clearance, so it rolls over chips, joints and ramps that would stop a 5". It also puts less deformation on the wheel at the same load — longer service life.

Q3: How does the single spring help a CNC router?
A: It isolates the frame from floor shocks, protecting the spindle, linear guides and ball screws — better surface finish and longer service life.

Q4: Can the 6" be used outdoors?
A: The galvanized bracket and PU wheel suit dry indoor industrial use. For rain, seawater or washdown, use our stainless steel series.

Q5: What is the 4-wheel system capacity?
A: Approximately 1,400 kg on a 4-wheel set (350 kg × 4), on flat, level floor with evenly distributed load.

We are a professional industrial caster manufacturer with MORE THAN 10 YEARS of factory experience. We operate our own production lines and quality control lab, and we welcome OEM / ODM orders for any combination of wheel and bracket.

We can customize:

• Wheel material : PU / TPR / Rubber / Nylon / PP / Phenolic
• Wheel hardness : Shore A 70 – 100
• Wheel colour : Red / Orange / Black / Grey / Blue / Custom
• Core material : Cast iron / Aluminium / Nylon
• Bracket / fork finish : Galvanized / Zinc-plated / Powder coated / 304 SS / 316 SS
• Mounting type : Top plate / Threaded stem / Expanding stem / Central bolt hole
• Brake / lock : Total lock / Directional lock / Side lock / No brake
• Bearing : 6202 / 6203 / 6204 / 6303 / stainless sealed
• Load rating : From 100 kg up to 1,000 kg+ per wheel
• Special features : Anti-static (ESD) / High-temp / Food-grade / Conductive / Flame-retardant / Explosion-proof / Dual wheel

Tell us your application, required load, wheel diameter and mounting style — we will engineer the right wheel-and-bracket combination for you.

✔ In Stock | ✔ OEM / ODM | ✔ Factory Direct | ✔ 10+ Years Experience