4 Inch Heavy Duty Iron Core Polyurethane PU Caster 270kg Load Top-plate 5.5mm steel bracket maintenance cart.

4 Inch Heavy Duty Iron Core Polyurethane (PU) Caster – 270kg Load, Rigid Mount, No Spring Shock Absorption

Short Description

Industrial 4" (100mm) iron-core polyurethane (PU, Shore A 95-98) swivel caster, 270kg capacity per wheel, 6203 bearing, 5.5mm galvanized steel bracket & top plate (115×100mm). Available in swivel (activity), side brake, and total brake. Non-spring, rigid fork — not for high-impact or shock-load environments.

Product Features

• Wheel: Iron Core Polyurethane (PU), Shore A 95-98, 100mm diameter × 50mm width
• Load Capacity: 270kg / caster
• Bearing: 6203 ball bearing
• Installation Height: 142mm
• Top Plate: 115 × 100mm; Hole Spacing: 82 × 72mm; Hole Dia.: 13mm
• Bracket / Plate Thickness: 5.5mm
• Fork: Rigid, non-spring, zinc-plated / galvanized finish
• Variants: 80I-S-BKJ-450 (Swivel), 80I-E-BKJ-450 (Side/Edge Brake), 80I-T-BKJ-450 (Total Brake)
• Mounting: Top-plate bolt-on

Product Advantages

• High static & rolling load for compact footprint
• Iron core prevents wheel deformation under load
• PU tread (Shore A 95-98):​ Excellent wear resistance, floor-protective, quieter than PP, good traction
• 6203 bearing for smooth, low-friction swivel
• 5.5mm steel bracket for long service life in warehouses
• Brake options: side brake locks wheel; total brake locks wheel + swivel

Applications by Variant (4 Inch)

• Swivel (Activity) 80I-S-BKJ-450:​ Light tool trolleys, workbench dollies, stock carts, garage storage racks, display stands
• Side Brake 80I-E-BKJ-450:​ Work-positioning carts, assembly-line fixtures, mobile tool chests
• Total Brake 80I-T-BKJ-450:​ Stationary work platforms, inspection stands, medical/lab utility carts on flat floors

Applicable Product Names

Tool trolley, garage dolly, light warehouse cart, workbench stand, stock shelf trolley, display rack caster, maintenance cart.

NOT Suitable / Where NOT to Use (No Spring = No Impact Absorption)

Do not​ use on CNC engravers, laser cutters, routers, scissor lifts, generators, outdoor rough terrain, stairs, thresholds, or any equipment with vibration/shock loads. This is a rigid caster — it does not absorb impact.

SEO Hot Keywords

4 inch heavy duty caster, 100mm iron core PU wheel, 270kg industrial caster, swivel side brake caster, total brake rigid caster, non-spring caster, warehouse trolley wheel, 6203 bearing caster, top plate 115x100 caster, galvanized bracket caster.

Google Ranking Target Phrases

• 4 inch heavy duty caster 270kg
• iron core polyurethane caster 100mm
• rigid industrial swivel caster no spring
• side brake vs total brake caster 4 inch
• 6203 bearing PU caster for trolley

FAQ

Q: Does this 4" caster have spring shock absorption?

A: No. It is a rigid fork/bracket design. No dual spring, no shock absorption.

Q: What is the difference between side brake and total brake?

A: Side/edge brake locks only the wheel. Total brake locks both wheel and swivel rotation.

Q: Can it replace a spring caster on a CNC machine?

A: No. CNC/laser equipment needs shock/vibration damping (spring or elastic PU). This rigid PU caster will transmit vibration and may damage precision equipment.

Q: Is PU wheel floor-safe?

A: Yes, PU (Shore A 95-98) is non-marking and protects epoxy/concrete floors from scratches.

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