4" Extra Heavy Duty Casters Iron Core PU Caste Thicken Braceket 280kg Load Capacity

The 4" (100 × 50 mm) iron core PU caster is the most compact and maneuverable size in the K02 heavy-duty series. Built with a chemical-bonded orange polyurethane tread (Shore A 90–95) over a solid cast iron core, mounted in a 5 mm black painted steel top-plate fork with a 6202 deep groove ball bearing, this wheel delivers 280 kg of single-wheel load capacity — giving a 4-wheel system approximately 1,120 kg of total carrying power.

It is engineered for dry indoor industrial environments: machining workshops, electronics assembly lines, repair bays, laboratories and maintenance rooms.

• Wheel tread: Orange Polyurethane (PU) on Cast Iron Core
• PU hardness: Shore A 90–95 (non-marking, wear resistant, shock absorbing)
• Temperature range: -20 °C to +80 °C (short peak +100 °C)
• Bearing: 6202 ZZ precision ball bearing (sealed option available)
• Fork / bracket: Heavy duty steel plate, black powder-coated / painted
• Wheel width: 50 mm
• Top plate: 140 × 110 mm
• Bolt hole spacing: 84 × 72 mm
• Bolt hole diameter: 13 mm
• Types: Rigid (Fixed), Swivel, Swivel with brake, Central hole, Central hole with brake
• Floor fit: Concrete, painted steel, epoxy, PVC tile (indoor dry only)

The 4 inch 280kg caster is the go-to choice for compact standalone equipment that moves short distances inside one bay or between adjacent workstations.

• Desktop / benchtop CNC engraving machine (6090, 3040, 4060 models)
• Mini milling machine, bench lathe, mini drill press stand
• Small CNC router for wood, acrylic and aluminum prototyping

• SMT magazine cart, PCB turnover trolley
• Electronics rack dolly, component storage wagon
• Wave solder fixture cart

• Heavy duty industrial sewing machine base (garment, upholstery, leather shops)
• Fabric cutting table on wheels

• Mechanic tool chest, roller cabinet, service cart
• Mobile workbench, maintenance trolley
• Portable vise stand

• Lab instrument trolley (spectrometer, balance, oscilloscope cart)
• Quality inspection cart, calibration equipment dolly
• Sample transport wagon

• Small parts bin wagon
• Light-duty picking cart
• Document / blueprint trolley

Low mounted height keeps the center of gravity down — critical for precision equipment like CNC engravers and lab instruments. The 280 kg single-wheel rating handles machines up to 1 ton on a 4-wheel set. PU at Shore A 90 absorbs spindle vibration without leaving marks on epoxy or concrete floors.

• Iron core PU wheel – zero tire deflection under 280 kg load
• Orange PU tread Shore A 90–95 – non-marking, oil & grease resistant
• 6202 ball bearing – smooth roll, low push force
• Black heavy steel yoke – economical, 5 mm thick
• Swivel / rigid / brake / central hole – full mounting options
• Floor protective on concrete, epoxy, tile
• OEM customization: plate size, brake type, bearing seal, PU durometer

This 4 inch heavy duty iron core PU caster is designed for light-to-medium industrial equipment mobility inside factories and workshops. It is widely used on CNC engraving machines, bench lathes, mini milling machines, SMT magazine carts, PCB turnover trolleys, industrial sewing machine bases, mechanic tool chests, roller cabinets, lab instrument trolleys and quality inspection carts. The cast iron core carries the weight; the polyurethane tread cushions vibration from spindles, motors and small compressors while leaving no black mark on the floor. Working temperature -20 °C to +80 °C covers cold workshop mornings and summer metal shops. For food grade, washdown, seawater or outdoor use, switch to stainless steel caster — this model is strictly for dry industrial duty.

4 inch caster 100mm heavy duty caster iron core PU wheel orange PU caster black bracket caster 6202 bearing caster 280kg caster wheel CNC engraver caster bench lathe wheel tool chest caster SMT cart wheel Shore A 90 PU non-marking industrial caster