4 Inch Heavy Duty Iron Core Cast Polyurethane (PU) Caster – 100mm Rigid, Swivel & Brake

Product Overview

The 4 Inch (100mm) Heavy Duty Iron Core Cast Polyurethane (PU) Caster is designed for compact yet robust industrial applications. Featuring a 50mm wide flat/plain tread and a rigid 5.5mm thick bracket, this caster delivers reliable load-bearing performance without spring suspension. Available in Fixed (Rigid), Swivel, and Brake configurations, it is the ideal choice for stable, heavy-duty material handling on flat surfaces.

• Model Series: B01-R/S/H-1PU-450
• Wheel Diameter: 4" / 100mm
• Tread Width: 50mm (Flat/Plain Tread)
• Load Capacity: 270kg per caster
• Bearing: 6203/6202 Ball Bearing
• Installation Height: 143mm
• Top Plate: 115×100mm | Hole Spacing: 82×72mm | Hole: Ø13mm
• Bracket Thickness: 5.5mm (Base & Fork)
• Material: Iron Core + Cast Polyurethane (PU), Shore A 95–98
• Options: Fixed / Swivel / Brake

Features & Advantages

• High Load Capacity: Supports up to 270kg per wheel, perfect for medium-duty industrial carts and machinery.
• Durable Iron Core: Prevents wheel deformation under sustained heavy loads.
• Cast PU Tread (Shore A 95–98): Excellent wear resistance, floor-protective, quieter than PP, good traction.
• 50mm Flat Tread: Provides maximum ground contact for superior stability and straight-line tracking.
• Rigid Structure: 5.5mm thick bracket ensures long service life with no flexing under weight.
• Smooth Operation: Equipped with 6203/6202 ball bearings for low-friction swiveling and pushing.
• No Spring Design: A rigid, non-shock-absorbing structure that keeps equipment height stable and predictable.

Application Scenarios — Where the 4 inch (100 mm) Size Is Used

The 4" rigid iron core PU caster is best suited for environments where stability and heavy load distribution are prioritized over shock absorption:

• Light Tool Trolleys & Workbench Dollies: Ideal for moving tool chests and assembly benches.
• Stock Carts & Garage Storage Racks: Provides a stable base for rolling storage in workshops.
• Display Stands & Fixtures: Used for heavy retail displays that require occasional movement.
• Maintenance Carts: Offers secure positioning for heavy tools and parts in industrial settings.
• Equipment Stands: Supports stationary or semi-stationary machinery on flat floors.

(Note: Not suitable for CNC routers, scissor lifts, or uneven outdoor terrain where spring suspension is required.)

Material & Build Advantages

• Cast Polyurethane (PU) Tread: Cast PU offers superior mechanical properties compared to molded PP — higher tear strength, excellent abrasion resistance, and non-marking performance on epoxy and concrete floors. Shore A 95–98 provides the ideal balance of hardness and elasticity for heavy loads.
• Iron Core Construction: Provides the structural integrity needed to handle 270kg without wheel distortion.
• Galvanized Finish: The 5.5mm bracket features a protective coating to resist corrosion in industrial environments.
• Standardized Mounting: The universal 115×100mm top plate allows for easy integration into existing equipment designs.

Aluminium Core vs. Iron (Steel) Core — Side by Side

Flat / Plain Tread vs Arc / Curved Korean-Style Tread – Difference

Understanding the tread design is crucial for selecting the right caster:

• Flat / Plain Tread (This Product): Features a full 50mm width of contact with the floor. It provides maximum stability, higher load distribution, and better straight-line tracking. It is designed for heavy-duty, flat-floor industrial use where equipment must remain steady.
• Arc / Curved Korean-Style Tread: Has a rounded crown. This reduces the contact patch, making it easier to pivot and turn (less scrub resistance). It is typically used for lighter-duty trolleys where maneuverability is more important than load stability.

The Biggest Difference: Flat tread = Stability & Heavy Load. Arc tread = Maneuverability & Easy Turning. This 4" caster is a rigid, anti-impact structural wheel with no shock absorption or spring suspension, built for strength, not cushioning.

Custom Orders — 10+ Years Professional Caster Manufacturer

We are a professional industrial caster manufacturer with more than 10 years of factory experience. We welcome OEM / ODM orders and can customize any combination of wheel and bracket to your requirements — including different materials and bracket thicknesses. Just send us your drawing, sample or requirement and we will engineer the right caster for your application.

Customization Options:

• Wheel material: PP / PU / TPR / Rubber / Nylon / Phenolic / Forged steel / Cast iron / Aluminium core rubber / Cast Polyurethane (PU)
• Wheel hardness: Shore A 70–100 (or D scale for PP / Nylon)
• Wheel colour: Any RAL colour
• Core / centre: Aluminium core, iron core, no core
• Bracket: Galvanized / Stainless 304 / Stainless 316 / Painted — in various thicknesses
• Bracket thickness & top plate size: to your drawing (standard A05 bracket is 5.5 mm; we can go thicker for higher loads)
• Mounting type: Top plate / Threaded stem / Bolt hole / Expanding adapter / Central hole
• Brake type: No brake / Side lock / Total lock / Direction lock
• Bearing: Plain / Roller / 6203 / 6204 / 6205 / 6305 etc.
• Load rating: From 100 kg up to 1,000 kg+ per caster
• Special features: Anti-static (ESD), high-temperature, food-grade, explosion-proof, dual-wheel, spring suspension

Get a Quote

Contact us today for a quote, free sample or engineering consultation. As a professional industrial caster manufacturer with over 10 years of factory experience, we are ready to help you select the right size and configuration for your application.

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