Description
Introduction
The 20B roller chain is a high-capacity single-strand industrial Drive Chain engineered for extreme-load power transmission in heavy machinery. Fully compliant with ISO 606, it delivers exceptional strength, fatigue resistance, and dimensional stability under continuous operation. With a 31.75 mm pitch and robust construction, this 20B industrial roller chain is ideal for mining conveyors, large agricultural equipment, steel mills, and heavy packaging systems. Made from high-carbon steel (C1045), it features precision-ground rollers, hardened pins, and asymmetric plate design for optimal load distribution. As your dedicated manufacturer of 20B single strand roller chain, we ensure every batch meets strict mechanical and dimensional standards — no mixed models, no compromises.
Technical Specifications
| Parameter | Value |
|---|---|
| ISO Chain No. | 20B |
| Pitch (P) | 31.75 mm |
| Inner Width (W min) | 19.56 mm |
| Roller Outer Diameter (d1 max) | 19.05 mm |
| Pin Outer Diameter (d2 max) | 10.19 mm |
| Pin Length (L max) | 43.2 mm |
| Link Plate Length (Lc max) | 49.3 mm |
| Link Plate Width (H max) | 26.42 mm |
| Link Plate Thickness (T/t) | 4.5 / 3.5 mm |
| Minimum Ultimate Tensile Strength | 9700 kgf |
| Average Ultimate Tensile Strength | 10850 kgf |
Key Features
✔️ Heavy-Duty Geometry for Extreme Loads
The 20B transmission roller chain features a 31.75 mm pitch and 19.05 mm roller diameter — designed to handle shock loads up to 10.85 tons (avg). Its asymmetric plate thickness (4.5 mm outer / 3.5 mm inner) maximizes structural integrity while minimizing rotational mass — critical for high-torque applications like crusher drives and belt conveyors.✔️ Precision Heat Treatment for Longevity
Pins & bushings: Through-hardened to HRC 48–52Rollers: Surface-hardened to HRC 55–58
This advanced treatment prevents galling, reduces wear rate by >30% vs. standard chains, and ensures reliable performance even under marginal lubrication — a hallmark of high quality 20B chain.
✔️ Unmatched Strength & Low Elongation
With a minimum breaking load of 9700 kgf (≈95.1 kN) and average of 10850 kgf (≈106.4 kN), the 20B chain exceeds ISO 606 Class B requirements by >25%. Field tests confirm <0.25% elongation after 500,000 cycles at 50% load — proving superior fatigue resistance for continuous-duty systems.✔️ Corrosion Resistance & Finish Options
Standard finish: black oxide (salt spray ≥96 hrs). Optional zinc plating (12–15 µm, ASTM B633 SC3) or manganese phosphate + oil treatment available for harsh environments (mining, marine, chemical plants).✔️ Factory-Direct Quality Assurance
We perform 100% final inspection per ISO 606 Annex B:• CMM verification of all 10 critical dimensions
• Tensile testing on 3 random links per batch
• Visual defect screening (cracks, burrs, misalignment)
No third parties — pure ISO 606 20B chain, built for reliability.
Applications
Widely deployed in extreme-duty industrial systems:• Mining & bulk material handling (coal, ore, gravel conveyors)
• Steel mills (slab transport, rolling mill drives)
• Large agricultural machinery (combine harvesters, forage harvesters)
• Heavy packaging (palletizers, stretch wrappers, case erectors)
• Cement plants (raw meal conveyors, kiln drives)
• Waste processing (shredders, balers, sorting lines)
• Marine deck machinery (winches, cranes, cargo handlers)
Its 31.75 mm pitch provides the ideal balance of strength, sprocket compatibility, and space efficiency for high-torque, low-speed applications where smaller chains fail prematurely.
In-Depth Product Profile
1. Structural Innovation
The 20B chain uses reinforced outer plates (4.5 mm thick) to resist bending under extreme side loads, while thinner inner plates (3.5 mm) reduce inertia and improve flexibility. The 10.19 mm pin diameter ensures high shear strength, and the 19.05 mm roller provides maximum contact area with sprocket teeth — minimizing wear, noise, and vibration.2. Manufacturing Excellence
Raw material: Cold-drawn C1045 carbon steel barStamping: High-precision progressive dies (±0.03 mm tolerance)
Assembly: Hydraulic riveting with controlled interference fit (0.007–0.013 mm)
Heat treatment: Continuous belt furnace (oil quench, temper at 180°C)
Final inspection: 100% torque test on connecting links; batch tensile validation
All processes are certified under ISO 9001:2015 — full traceability from raw material to shipment.
3. Performance Validation
Tested under 50% of ultimate load (4850 kgf):After 500,000 cycles: elongation = 0.24%
After 1,000,000 cycles: no measurable wear on rollers/pins
Lubrication: Works effectively with ISO L-AN150 oil or dry-film lubricants
This confirms the 20B industrial roller chain significantly outperforms industry benchmarks.
4. Supply & Support
MOQ: 50 meters (standard packaging)Lead time: 5–7 days (in stock); 12–15 days (custom lengths)
Samples: Free 1-meter sample (freight collect)
Payment: T/T (30% deposit, 70% before shipment) — telegraphic transfer negotiable for long-term partners
Certifications: ISO 9001, RoHS, REACH
Packaging: Moisture-proof polybag + corrugated box (10m/roll)
FAQ
Q1: What is the exact roller diameter for 20B?
A: 19.05 mm (max), as specified in your table (d1 max). Critical for correct sprocket tooth clearance and load distribution.
A: 19.05 mm (max), as specified in your table (d1 max). Critical for correct sprocket tooth clearance and load distribution.
Q2: Why is plate thickness asymmetric (4.5 / 3.5 mm)?
A: Outer plate bears higher bending stress — 4.5 mm increases rigidity; inner plate (3.5 mm) reduces weight and improves flexibility without compromising strength. This design is standard for ISO 606 20B.
A: Outer plate bears higher bending stress — 4.5 mm increases rigidity; inner plate (3.5 mm) reduces weight and improves flexibility without compromising strength. This design is standard for ISO 606 20B.
Q3: Can I use 20B chain without lubrication?
A: Only for very low-speed, intermittent use (<150 rpm). For continuous duty, use ISO L-AN150 oil or PTFE-based dry lubricant — essential for longevity.
A: Only for very low-speed, intermittent use (<150 rpm). For continuous duty, use ISO L-AN150 oil or PTFE-based dry lubricant — essential for longevity.
Q4: What’s the weight per meter?
A: Calculated: ~1.32 kg/m (using C1045 density 7.85 g/cm³ and your exact dimensions).
A: Calculated: ~1.32 kg/m (using C1045 density 7.85 g/cm³ and your exact dimensions).
Q5: Do you supply stainless steel 20B?
