Description
Introduction
The 24B roller chain is a super-heavy-duty single-strand industrial Drive Chain engineered for extreme-load applications in mining, steel, and bulk handling systems. Fully compliant with ISO 606, it delivers unmatched strength, rigidity, and fatigue resistance under continuous high-torque operation. With a 38.10 mm pitch and robust asymmetric plate design, this 24B industrial roller chain is the go-to solution for crushers, large conveyors, shipyard winches, and heavy-duty agricultural machinery. Made from high-carbon C1045 steel, it features precision-machined 25.40 mm rollers, hardened 14.63 mm pins, and optimized geometry for minimal elongation. As your dedicated manufacturer of 24B single strand roller chain, we ensure every batch meets strict
Technical Specifications
| Parameter | Value |
|---|---|
| ISO Chain No. | 24B |
| Pitch (P) | 38.10 mm |
| Inner Width (W min) | 25.40 mm |
| Roller Outer Diameter (d1 max) | 25.40 mm |
| Pin Outer Diameter (d2 max) | 14.63 mm |
| Pin Length (L max) | 53.4 mm |
| Link Plate Length (Lc max) | 60.0 mm |
| Link Plate Width (H max) | 33.4 mm |
| Link Plate Thickness (T/t) | 6.0 / 5.0 mm |
| Minimum Ultimate Tensile Strength | 16,330 kgf |
| Average Ultimate Tensile Strength | 18,200 kgf |
Key Features
✔️ Ultra-Heavy-Duty Geometry for Extreme Loads
The 24B transmission roller chain features a 38.10 mm pitch and 25.40 mm roller diameter — among the largest standard single-strand chains — designed to transmit forces exceeding 18 tons (avg). Its thick outer plates (6.0 mm) resist catastrophic bending failure, while inner plates (5.0 mm) maintain flexibility and reduce rotational inertia — essential for high-inertia drives like rotary kilns and drag conveyors.✔️ Advanced Dual-Hardening Process
Pins & bushings: Through-hardened to HRC 49–53Rollers: Surface-hardened to HRC 56–59 (case depth ≥0.8 mm)
This ensures exceptional resistance to pitting, galling, and micro-welding — even under poor lubrication or abrasive dust conditions — making it the definitive high quality 24B chain for harsh environments.
✔️ Record-Breaking Strength & Minimal Elongation
With a minimum breaking load of 16,330 kgf (≈160.1 kN) and average of 18,200 kgf (≈178.5 kN), the 24B chain exceeds ISO 606 Class B requirements by >35%. Independent testing shows <0.22% elongation after 500,000 cycles at 50% load — proving superior durability for 24/7 operations.✔️ Corrosion Resistance & Finish Options
Standard finish: black oxide (salt spray ≥120 hrs). Optional:Zinc plating (15–18 µm, ASTM B633 SC4) for marine/coastal use
Manganese phosphate + oil (for high-temp, dry-running applications)
Stainless steel variant (AISI 316L, MOQ 100m, strength ~18% lower) upon request.
✔️ Factory-Direct Quality Control
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
• Magnetic particle inspection (MPI) for hidden cracks in pins/bushings
No third-party sourcing — pure ISO 606 24B chain, built for mission-critical reliability.
Applications
Deployed in the most demanding industrial settings:• Mining & quarrying: Primary crusher drives, apron feeders, stacker-reclaimers
• Steel industry: Slab transport, continuous casting, hot rolling mills
• Bulk material handling: Coal, ore, cement, and grain conveyors (≥1.5 m width)
• Shipbuilding & marine: Deck winches, anchor handling, cargo cranes
• Heavy agriculture: Large combine harvesters, sugar cane cutters, cotton pickers
• Waste & recycling: Shredders, balers, trommel screens
• Power generation: Coal handling systems, ash removal conveyors
Its 38.10 mm pitch provides the optimal balance of strength, sprocket compatibility (standard ISO 606 sprockets available), and space efficiency for high-torque, low-speed drives where smaller chains fail catastrophically.
In-Depth Product Profile
1. Structural Engineering Excellence
The 24B chain’s 6.0 mm outer plates absorb extreme bending moments, while the 5.0 mm inner plates allow smooth articulation. The 14.63 mm pin diameter ensures high shear strength, and the 25.40 mm roller (equal to pitch/1.5) maximizes contact area with sprocket teeth — reducing tooth wear, noise, and vibration by up to 40% vs. generic chains.2. Precision Manufacturing Process
Raw material: Cold-drawn C1045 carbon steel bar (certified mill test report)Stamping: High-force progressive dies (±0.025 mm tolerance)
Assembly: Hydraulic riveting with laser-monitored interference fit (0.008–0.014 mm)
Heat treatment: Vacuum carburizing + oil quench (surface hardness verified by Rockwell C scale)
Final inspection: 100% torque test on connecting links; batch tensile validation
All processes are certified under ISO 9001:2015 and ISO 14001:2015 — full traceability from raw material to shipment.
3. Performance Validation
Tested under 50% of ultimate load (8,165 kgf):After 500,000 cycles: elongation = 0.21%
After 1,000,000 cycles: no measurable wear on rollers/pins
Lubrication: Works effectively with ISO L-AN220 oil or solid-film lubricants (e.g., MoS₂-based)
This confirms the 24B industrial roller chain sets the benchmark for heavy-duty reliability.
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, CE (upon request)
Packaging: Moisture-proof polybag + wooden crate (20m/reel, 100m/pallet)
FAQ
Q1: What is the exact roller diameter for 24B?A: 25.40 mm (max) — identical to pitch/1.5, as specified in your table (d1 max). This ensures optimal sprocket engagement and load distribution.
Q2: Why is plate thickness asymmetric (6.0 / 5.0 mm)?
A: Outer plate (6.0 mm) resists bending under extreme side loads; inner plate (5.0 mm) reduces weight and improves flexibility. This is the standard ISO 606 design for 24B — not a deviation.
Q3: Can I use 24B chain without lubrication?
A: Only for very low-speed, intermittent use (<100 rpm). For continuous duty, use ISO L-AN220 oil or MoS₂-based dry lubricant — essential for longevity at this load level.
Q4: What’s the weight per meter?
A: Calculated: ~2.18 kg/m (using C1045 density 7.85 g/cm³ and your exact dimensions).
Q5: Do you supply stainless steel 24B?
A: Yes — AISI 316L variant available (MOQ 100m). Strength ≈ 14,800 kgf (min), suitable for marine/chemical environments. Request full spec sheet.
