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Our 3"/4"/5" Thread stem Medium ESD Caster Wheels combine electrostatic discharge (ESD) protection with a convenient thread stem design, ideal for medium-duty equipment that requires secure, tool-free installation. Available in 3" (75mm), 4" (100mm), and 5" (125mm) sizes, these casters support loads from 100kg (3") to 140kg (5") and deliver reliable ESD control—critical for electronics assembly, data centers, and aerospace component handling. The thread stem allows easy attachment to equipment with pre-drilled threaded holes (e.g., mobile workbenches, server racks, or parts carts), eliminating the need for mounting plates. Their grey TPR tread ensures quiet, floor-friendly movement, making them suitable for noise-sensitive environments like labs or cleanrooms.
Wheel Tread: High-quality TPR (65-70 Shore A) that provides abrasion resistance, shock absorption, and noise reduction. The non-marking tread protects delicate flooring (e.g., cleanroom epoxy) and maintains a professional appearance.
Wheel Core: PP (polypropylene) for lightweight durability and corrosion resistance, suitable for humid or chemical-exposed settings (e.g., pharmaceutical labs with solvent use).
Thread Stem: Zinc-plated steel for strength and rust resistance, compatible with standard thread sizes (custom sizes available upon request).
Thread Stem Installation: The stem design enables quick, tool-free attachment to equipment—simply twist the caster into pre-threaded holes, no mounting plates or bolts needed.
ESD Performance: Meets 332-0G standards, with a conductive range of 10³-10⁵ ohms and anti-static range of 10⁸-10¹⁰ ohms, effectively dissipating static to protect sensitive electronics.
Swivel/Fixed Options: Available in both swivel (360° movement) and fixed (straight-line) designs, catering to different mobility needs (e.g., swivel for server racks, fixed for assembly line carts).
| Wheel |
| Color : Grey |
| Hardness: 65-70 Shore A |
| Wheel core : PP |
| Wheel tread : TPR |
| Conductive ：10^3-10^5 (332-0G) |
| Anti-static ：10^8-10^10 (332-0G) |
| Model | Wheel Material | Wheel Dia | Tread Width | Load Height | Plate Size | Plate Size | Hole Size | Load Capacity |
| 301ZN-010-63-333-2G | ESD/ AS TPR | 63 (2.5") | 32 | 92 | 96*66 | 75*45 | 8.5 | 80 |
| 301ZN-010-75-333-2G | ESD/ AS TPR | 75(3") | 32 | 105 | 96*66 | 75*45 | 8.5 | 100 |
| 301ZN-010-100-333-2G | ESD/ AS TPR | 100(4") | 32 | 130 | 96*66 | 75*45 | 8.5 | 120 |
| 301ZN-010-125-333-2G | ESD/ AS TPR | 125(5") | 32 | 158 | 96*66 | 75*45 | 8.5 | 140 |
| Model | Wheel Material | Wheel Dia | Tread Width | Load Height | Plate Size | Plate Size | Hole Size | Load Capacity |
| 301ZN-020-63-333-2G | ESD/ AS TPR | 63 (2.5") | 32 | 92 | 96*66 | 75*45 | 8.5 | 80 |
| 301ZN-020-75-333-2G | ESD/ AS TPR | 75(3") | 32 | 105 | 96*66 | 75*45 | 8.5 | 100 |
| 301ZN-020-100-333-2G | ESD/ AS TPR | 100(4") | 32 | 130 | 96*66 | 75*45 | 8.5 | 120 |
| 301ZN-020-125-333-2G | ESD/ AS TPR | 125(5") | 32 | 158 | 96*66 | 75*45 | 8.5 | 140 |
| Model | Wheel Material | Wheel Dia | Tread Width | Load Height | Plate Size | Plate Size | Hole Size | Load Capacity |
| 301ZN-022-63-333-2G | ESD/ AS TPR | 63 (2.5") | 32 | 92 | 96*66 | 75*45 | 8.5 | 80 |
| 301ZN-022-75-333-2G | ESD/ AS TPR | 75(3") | 32 | 105 | 96*66 | 75*45 | 8.5 | 100 |
| 301ZN-022-100-333-2G | ESD/ AS TPR | 100(4") | 32 | 130 | 96*66 | 75*45 | 8.5 | 120 |
| 301ZN-022-125-333-2G | ESD/ AS TPR | 125(5") | 32 | 158 | 96*66 | 75*45 | 8.5 | 140 |
Tool-Free Installation: Thread stem design reduces setup time—ideal for equipment that requires frequent caster replacement or reconfiguration (e.g., mobile workbenches in electronics labs).
Superior ESD Protection: Dissipates static to prevent damage to semiconductors, circuit boards, or aerospace components, making it a must-have for ESD-sensitive industries.
All-Environment Durability: TPR and PP resist oils, solvents, and moisture, ensuring long service life in harsh industrial settings (e.g., automotive manufacturing plants with oil exposure).
Quiet & Floor-Friendly: Shock-absorbing TPR minimizes operational noise, while the non-marking tread avoids scratches—perfect for offices, labs, or cleanrooms where noise and floor quality matter.
A1: Standard thread sizes include M8, M10, and M12 (common in industrial equipment). Custom thread sizes (e.g., 1/4"-20 UNC for North American equipment) are available with a 2-week lead time. Contact our team to confirm compatibility with your equipment.
A2: They are designed for indoor use, but the zinc-plated stem and PP core resist mild moisture (e.g., humid cleanrooms). Avoid prolonged outdoor exposure or standing water, as this may degrade the TPR tread over time.
A3: Clean the TPR tread regularly with a mild detergent (avoid harsh chemicals) to remove dust or debris that could block static dissipation. Test the ESD resistance quarterly with a 332-0G meter—replace the caster if the resistance falls outside the 10³-10⁵ (conductive) or 10⁸-10¹⁰ (anti-static) range.
