Heavy Duty Iron Core Pu Spring Loaded Shockabsorbingcaster Caster Wheels Laser Welding Machine

5" A02 Single Spring Shock Absorbing Caster | Red Iron Core PU | 300/350kg | Galvanized

H1: 5" A02 Single Spring Shock Absorbing Caster — Red Cast Iron Core PU Wheel, Galvanized Bracket, 300 / 350 kg

Breadcrumb: Home / Heavy Duty Casters / A02 Korean Style Series / 5 Inch (125mm)

PRODUCT OVERVIEW

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 5 inch (125 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 caster rolls over a floor joint, threshold or chip pile, the spring compresses vertically and absorbs the impact before it reaches the machine frame — quieter operation, less vibration, longer bearing life, smoother push.

The 5 inch is the "sweet spot" size of the A02 family: 184 mm installed height, and a split load rating by model — Fixed (Rigid) 300 kg, Swivel and Swivel+Brake 350 kg per wheel. It is the most-specified size for mid-weight stationary machines that need occasional repositioning for maintenance or shop-floor re-layout.

Common search terms covered: 5 inch single spring caster, A02 shock absorbing caster, red iron core PU wheel galvanized bracket, fiber laser cutter caster, table saw caster, VFD cabinet caster, Korean style heavy duty caster, Shore A 95-98 PU wheel, 6203 bearing caster.

TECHNICAL SPECIFICATIONS

NOTE: The 5" Fixed (Rigid) model is rated 300 kg/wheel; Swivel and Swivel+Brake are rated 350 kg/wheel — as listed in the original specification sheet. System capacity on a 4-wheel set ≈ 1,200 kg (Fixed) / 1,400 kg (Swivel).

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

MATERIAL ADVANTAGES

[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
• The RED colour acts as a visual wear indicator: when the black iron core shows through the red tread, it is time to 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 both 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
  • laser tubes and optical components
  • VFD / electrical control cabinets
  • precision measuring instruments
  • 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.

APPLICATION GUIDE — 5 INCH (125 mm) — WHERE AND ON WHAT

The 5" is the most versatile size in the A02 range. 184 mm installed height and 300/350 kg capacity make it the default choice for mid-weight stationary machines that are moved occasionally for maintenance or re-layout.

★ LASER & CNC (mid-weight)

• Fiber laser cutting machine (1325, 1390, 1530 entry/mid range)
• CO₂ laser engraving / cutting machine frame
• Small CNC router (6090, 1212), CNC plasma cutter stand
• Laser marking / laser welding machine base

★ WOODWORKING

• Sliding table saw, panel saw stand
• Thickness planer, jointer, band saw stand
• CNC woodworking machine base, edge banding machine trolley

★ ELECTRICAL & CONTROL

• Electrical control cabinet, VFD / PLC / servo panel enclosure
• Power distribution cabinet, switchgear trolley
• Industrial UPS / battery bank dolly

★ WELDING & FITTING

• Welding table, fitter's bench, assembly fixture trolley
• Welding positioner base, grinding station cart

★ PRINTING & PACKAGING

• Printing machine stand, die-cutting machine dolly
• Carton sealing / strapping machine trolley

★ INJECTION MOLDING (auxiliary)

• Material dryer cart, mold exchange dolly
• Granulator / mixer trolley

★ MEDICAL & LAB (indoor dry only)

• Portable X-ray / ultrasound / sterilizer cart
• Laboratory analysis instrument trolley

★ WAREHOUSE & HANDLING

• Medium-duty service cart, parts bin wagon
• Inspection / quality-control trolley

WHY 5 INCH:
The 125 mm wheel rolls over cables, chips and floor joints far better than the 4" while keeping machine height ergonomic. The 300/350 kg rating covers the majority of mid-weight shop equipment — fiber laser cutters, table saws, control cabinets and welding tables. This is the most commonly specified A02 size for a reason: it fits the broadest range of applications.

WHY CHOOSE THE 5 INCH A02 (vs 4", 6", 8")

• 184 mm installed height — balanced between low-profile and ground clearance
• Best-selling "all-rounder" — fits the widest machine range
• Rolls over floor joints and cables better than 4"
• Still light enough that it does not raise the machine too high
• 300/350 kg covers most mid-weight industrial equipment
  → When one size has to fit everything, choose the 5".

KEY FEATURES

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 300 kg (Fixed) / 350 kg (Swivel/Brake) per wheel
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

LONG-TAIL SEO PARAGRAPH

The A02 5 inch single spring shock absorbing caster is the most versatile size in the series, built for mid-weight industrial equipment that needs occasional mobility. 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 fiber laser cutting machines (1325 / 1390 / 1530), CO₂ laser engravers, small CNC routers, sliding table saws, thickness planers, jointers, band saws, electrical control cabinets, VFD and PLC panels, welding tables, fitters benches, printing machines, die-cutting machines, injection molding auxiliaries (dryer, mold cart, granulator), portable X-ray and ultrasound carts, and medium-duty service trolleys. The iron core carries the load; the high-hardness PU tread cushions motor and spindle vibration 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 300 kg (Fixed) and 350 kg (Swivel/Brake) per wheel.

FREQUENTLY ASKED QUESTIONS

Q1: Why is the 5" Fixed model 300 kg but Swivel is 350 kg?
A: This follows the original specification sheet — the Fixed (Rigid) bracket has a slightly different load path, so it is conservatively rated 300 kg while Swivel and Swivel+Brake are rated 350 kg. Always size from the lowest-rated wheel in your set.

Q2: What machines most often use the 5 inch A02?
A: Fiber laser cutters (1325/1390), table saws, thickness planers, VFD cabinets, welding tables, printing machines and injection molding auxiliaries.

Q3: Is the 5" a good general-purpose size?
A: Yes. It rolls over cables and floor joints better than 4" while keeping machine height low — the default choice for mid-weight equipment.

Q4: Can the single spring handle continuous towing?
A: The single spring is optimised for intermittent rolling and shock loads. For high-speed or continuous towing, contact us to select spring rate and bracket configuration.

Q5: Is the galvanized bracket stainless?A: No. Galvanized steel is for dry indoor industrial use. For washdown, food, seawater or outdoor use, choose our 304 / 316 stainless steel series.

CUSTOM ORDER — WELCOME TO CUSTOMIZE

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.

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