Anhui Huihuang Chain Transmission Co., Ltd. is one of the leading manufacturers and suppliers of 12 double row top roller chain in China, featured by quality products and good service. If you're going to wholesale advanced 12 double row top roller chain made in China, welcome to get pricelist and free sample from our factory. We also accept customized orders.
Products Description
12A / 12B Double Row Top Roller Chain (3/4" Pitch Accumulating Conveyor Chain)
The 12A/12B double row top roller chain (3/4" pitch) is designed specifically for double strand top roller chain systems and free-flow conveyor chains. This chain, which is commonly used in automated assembly lines, electronics production, automotive component transfer, and warehousing automation, is made to enable continuous material handling without interrupting the driving base chain.
An accumulating conveyor chain enables seamless work-in-progress (WIP) buffering. Understanding how the top roller interacts with the conveying line is critical for system design:
Continuous Base Motion: The primary double strand top roller chain runs continuously driven by the main sprockets, maintaining constant line speed.
Free-Rolling Accumulation: When products or pallets are stopped by pneumatic stoppers along the line, the top rollers rotate freely beneath the stationary load.
Pallet & Workpiece Protection: By converting sliding friction into smooth rolling motion, line pressure drops by over 70%. This prevents scuffing on sensitive pallets/workpieces and protects the motor drive from overload.
Instant Acceleration: Once the stopper releases, friction instantly re-engages the top roller, smoothly advancing the pallet without mechanical shock.
Engineering Plastic vs. Carbon Steel Top Roller Comparison
Choosing the right top roller material is essential to optimize service life, noise levels, and load capacity
| Feature / Property | Engineering Plastic Top Roller (POM / Nylon) | Carbon Steel / Alloy Steel Top Roller |
| Primary Advantage | Ultra-low noise, non-marking, lightweight | Maximum strength, heat & chemical resistance |
| Pallet Protection | Excellent (prevents scratches on plastic/aluminum pallets) | Moderate (recommended for heavy steel pallets) |
| Noise Level | Very Low (< 65 dB) | Standard industrial operational noise |
| Max Load Capacity | Light-to-Medium loads | Heavy-duty / High-impact loads |
| Operating Temp. Range | -10°C to +80°C | -20°C to +200°C (with heat-resistant lube) |
| Best Applications | Electronics, automotive assembly, cleanrooms, packaging | Heavy machinery, metal forging, high-temp curing ovens |
Core Structural Features
- Top Roller Bearing Structure Load is carried by top rollers. Link plates are separated from guide rails to avoid direct abrasion and extend service life.
- Higher Load Capacity of Double Strand Greater tensile strength than single-row chains, suitable for continuous medium-heavy load conveying.
- Compatible with Standard 12A Sprockets Standard 12A transmission structure; no customized driving sprockets required, easy spare parts sourcing.
- Low Running Resistance Rolling friction reduces power consumption, delivering smooth and low-noise operation.
- Flexible Customization Heat-treated carbon steel, 304 / 316 stainless steel available. Roller diameter, height and installation spacing can be customized.
Technical Specifications (12A & 12B Standards)
Our short-pitch collecting chains and double pitch top roller chains closely adhere to ISO/BS 228 (12B) and ANSI B29.1 (12A) specifications, guaranteeing easy interchangeability with international OEM equipment.
Chain Pitch: 3/4" (19.05 mm)
Configuration: Double Row / Double Strand with centered or offset top rollers
Material Options: Carbon Steel (Case-hardened pins/bushings), Stainless Steel (SUS304/316), or Nickel-Plated / Zinc-Plated for corrosion resistance
Lubrication: Factory pre-lubricated with high-viscosity synthetic grease (Maintenance-Free self-lubricating bush options available)
Summary of Advantages
- Top rollers protect link plates and greatly reduce chain abrasion
- Standard 12A double-strand design provides sufficient load capacity and wide versatility
- Rolling support lowers friction, energy consumption and operation noise
- Multiple material options for normal temperature, humid and mild corrosive environments
- Universal matching sprockets cut equipment retrofitting and spare part costs
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