100mm caster

Selecting the correct wheel material is critical for durability and floor protection. For industrial concrete floors, Polyurethane (PU) on Iron or Nylon wheels are ideal due to their high load capacity and abrasion resistance. For sensitive surfaces like hardwood or tile, choose Thermoplastic Rubber (TPR) or Elastic Rubber to prevent marking and reduce noise. If the environment involves chemicals or oils, Polypropylene (PP) or Stainless Steel housings are recommended to prevent corrosion.

Buyers must distinguish between Static Load and Dynamic Load. For a 100mm caster, the dynamic load typically ranges from 70kg to 150kg per wheel depending on the series (Light, Medium, or Heavy Duty). To calculate the safe working load for a 4-wheel trolley, use the formula: (Total Weight of Trolley + Max Load) / 3. This safety factor accounts for uneven floors where only three wheels may touch the ground simultaneously.

Ensure the Top Plate size and Bolt Hole spacing match your equipment's mounting interface. Regarding movement efficiency, Ball Bearings are best for frequent manual movement and heavy loads as they provide the lowest rolling resistance. Roller Bearings are suitable for shock resistance in power-towed applications, while Plain Bearings (Bushing) are a cost-effective choice for light-duty equipment that is moved infrequently.

For the European market, ensure compliance with EN 12532 (Casters and wheels for speeds up to 4 km/h). For North America, look for ANSI/ICWM standards. If the casters are used in medical or food environments, verify NSF certification and RoHS/REACH compliance for hazardous substance restrictions in the plastic and rubber components.

Request a Salt Spray Test Report (typically 24-48 hours) to ensure the zinc plating or stainless steel can resist rust. Additionally, demand a Brake Cycle Test report to confirm the locking mechanism doesn't fail after repeated use. For large orders, utilize third-party inspection services to conduct a 'Drop Test' and 'Rolling Wear Test' before the final balance payment is made.

Focus on Material Weight and Thickness rather than just unit price; for example, specify a 3mm or 4mm pressed steel housing. Ask for tiered pricing based on volume (e.g., 500, 2000, and 5000 units). Since casters are heavy, negotiate FOB (Free On Board) terms to maintain control over sea freight costs, and ask the supplier if they can provide customized branding (logo embossing) on the metal fork for orders exceeding 1,000 pieces.

Casters are high-density goods. Ensure the supplier uses double-corrugated export cartons reinforced with plastic strapping. To prevent shifting during transit, all cartons should be palletized and shrink-wrapped. Clearly define the HS Code (typically 8302.20) in the shipping documents to avoid customs delays and ensure accurate duty calculation.

Always conduct transactions through secured payment channels provided by reputable platforms like Made-in-China.com. Use Audit Reports to verify if the supplier is a 'Diamond Member' or a 'Verified Supplier' with a physical factory audit. Avoid transferring large sums via unprotected wire transfers to unknown individual accounts; instead, use Escrow-based trade terms where the payment is only released upon proof of shipment.