Heavy Duty Series Roller Chains

Raydafon Group's Heavy Duty Series Roller Chains are engineered for superior strength and durability in industrial applications, featuring high-quality materials and precision design to handle extreme loads. Ideal for manufacturers and engineers, they ensure reliable performance, reduce downtime, and boost productivity. Stand out with exceptional wear resistance and smooth operation, offering a cost-effective solution for heavy machinery.

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Product Description

Heavy Duty Series Roller Chains — ANSI 40H to 240H High-Strength Chains for Demanding Drives

Raydafon Heavy Duty Series Roller Chains are short-pitch precision roller chains conforming to ISO 606, ASME/ANSI B29.1, DIN 8187 and JIS standards. Compared with standard chains of the same pitch, heavy duty chains use larger pin diameters, thicker link plates and wider pin lengths — delivering substantially higher tensile strength and fatigue resistance for engineering machinery, mining equipment and heavy conveyor systems.

If you are sourcing heavy duty roller chains for OEM assembly, MRO replacement or dealer stock, this page gives you the complete chain number range, material and heat treatment data, performance comparison against ISO standards, and the exact information we need to quote you accurately.

11× ISO Tensile Strength Minimum tensile strength exceeds the ISO standard minimum by more than 11 times across all chain numbers.

1.1× ISO Fatigue Strength Fatigue strength exceeds the ISO minimum dynamic load strength by more than 1.1 times for extended service life.

Simplex · Duplex · Triplex From 35H-1 (9.525 mm pitch) to 240H-1 (76.200 mm pitch) simplex; duplex and triplex configurations available.

4 International Standards Dimension and tolerance compliance with ISO 606, ASME/ANSI B29.1, DIN 8187 and JIS for reliable interchangeability.

Heavy Duty Series Roller Chains ANSI 40H-240H

Heavy Duty Series Simplex Roller Chain Technical Drawing

Heavy Duty Series Duplex Roller Chain Technical Drawing

Heavy Duty Series Triplex Roller Chain Technical Drawing

How Heavy Duty Roller Chains Deliver Higher Load Capacity

A standard roller chain transmits power through a series of pin-bushing joints. Heavy duty series chains increase the pin diameter and link plate thickness while maintaining the same pitch as the standard chain number. This increases the shear area of the pin and the tensile cross-section of the plates without changing the chain's sprocket engagement dimensions.

The result is a chain that fits the same sprocket as the standard version but delivers substantially higher tensile strength and fatigue resistance. Raydafon heavy duty chains are manufactured from high-quality alloy steel with advanced heat treatment of pins and bushings. The minimum tensile strength exceeds the ISO standard minimum by more than 11 times, and the fatigue strength exceeds the ISO minimum dynamic load strength by more than 1.1 times.

Heavy Duty Roller Chain Selection Guide — Simplex, Duplex & Triplex

Select the chain number based on required tensile strength and pitch. Select simplex, duplex or triplex based on required load capacity and available width. Below is the standard range. Custom chain lengths and special attachments are available on request.

Chain Series	Chain Numbers	Pitch Range	Max Tensile Strength	Typical Application
Simplex (1-strand)	35H-1 to 240H-1	9.525 – 76.200 mm	510.3 kN (240H-1)	Standard heavy drives, conveyors
Duplex (2-strand)	60H-2 to 240H-2	19.050 – 76.200 mm	1000 kN (240H-2)	Higher load capacity drives
Triplex (3-strand)	60H-3 to 240H-3	19.050 – 76.200 mm	1500 kN (240H-3)	Maximum load, mining, steel mills
Special / Bush Series	04BH to 32BHF1	6.000 – 50.800 mm	350 kN (32BHF1)	Special conveyors, OEM equipment

Complete dimensional data (pin diameter, pin length, inner plate depth, plate thickness, transverse pitch) for every chain number is available in the technical drawings above. Send your chain number and required length for a confirmed quotation.

Where Heavy Duty Roller Chains Are Used

Engineering machinery — excavators, bulldozers, cranes and drilling rigs where shock loads and continuous operation demand high fatigue resistance.
Agricultural machinery — combine harvesters, balers, agricultural machinery chain drives and grain handling equipment.
Mining and quarrying — crushers, screens and heavy conveyors operating in abrasive and dusty environments.
Heavy conveyor systems — bulk material handling in ports, steel mills and cement plants.
OEM equipment manufacturing — machine builders needing a pre-engineered heavy duty chain solution.
MRO replacement — replacing worn chains on existing production and material handling equipment.

Quality Control You Can Audit

Every heavy duty series roller chain goes through incoming alloy steel verification, pin and bushing heat treatment hardness check, link plate tensile testing, pitch and roller diameter inspection, chain assembly and articulation check, and a final pre-stretch and length measurement before packing.

Dimensions and tolerances comply with ISO 606, ASME/ANSI B29.1, DIN 8187 and JIS. Read how we manage process control and traceability on our Quality page, or see the full company profile for capacity and equipment.

Ordering & Supply Information

What to send for a fast quotation

Chain number (e.g. 60H-1, 80H-2, 100H-1)
Strand configuration (simplex, duplex, triplex)
Required chain length in pitches or metres
Quantity, destination port, and whether OEM branding is needed

Supply terms

Sample and trial orders accepted for fitment and quality verification
MOQ depends on chain number and stock status — confirm per order
Export packing: individual boxes, then carton + pallet
Custom chain length, attachments and surface treatment available

Installation & Maintenance Tips

Verify chain number and sprocket compatibility before installation. Heavy duty chains share the same pitch as standard chains but require the correct sprocket tooth profile.
Align drive and driven sprockets accurately. Misalignment causes uneven load distribution and accelerated wear on one side of the chain.
Set correct chain sag. Too tight increases bearing load and wear; too loose causes sprocket tooth jump under load.
Lubricate according to the chain manufacturer's recommendation for the operating speed and load. Heavy duty chains under high load benefit from regular lubrication.
Check chain elongation at each service interval. Replace the chain when elongation exceeds 2% of the original length (1% for precision drives).
Inspect sprocket tooth wear when replacing the chain. A worn sprocket will accelerate wear on a new chain.
Keep the chain clean of abrasive debris. Contamination accelerates pin and bushing wear.

FAQ — Heavy Duty Series Roller Chains

What is a heavy duty series roller chain? A heavy duty series roller chain is a short-pitch precision roller chain with increased pin diameter, thicker link plates and wider pin length compared with standard chains of the same pitch. This design increases tensile strength and fatigue resistance, making it suitable for heavy loads, shock loads and continuous operation in engineering machinery, mining equipment and agricultural machinery.

What chain numbers are available in simplex, duplex and triplex? Simplex chains range from 35H-1 to 240H-1 (pitch 9.525 mm to 76.200 mm). Duplex chains range from 60H-2 to 240H-2. Triplex and special series include 04BH, 06BH, 35HF1, 08AHF1, 08BH, 41HF1, C40HF3, C08BHF8, 10BH, 10BHF1, 12BH, 12BHF1 through 12BHF5, 12BV, 60HV, 12AHF7, 12AHF101, C12BHF3, 16BH, 16BHF3, C20AHF1, 20BH, 20BHF1, 24BH, 24BHF2, 24BHF5, 28BH, 32AHF1, 32BH and 32BHF1. Send your chain number and strand configuration for a confirmed quotation.

What material and heat treatment are used? Heavy duty series roller chains are manufactured from high-quality alloy steel. The pins and bushings receive advanced heat treatment to achieve high surface hardness and core toughness. The minimum tensile strength exceeds the ISO standard minimum by more than 11 times, and the fatigue strength exceeds the ISO minimum dynamic load strength by more than 1.1 times.

What is the MOQ and lead time? Sample orders are accepted for fitment and quality verification before bulk purchase. MOQ depends on chain number, strand configuration and whether the model is in stock or produced to order. Lead time is typically 7–15 days for samples and 25–35 days for mass production. Send your quantity and destination port for a quotation.

Can you customize the chain length, attachments or coating? Yes. We support OEM/ODM customization including custom chain length, special attachments (extended pins, U-type, straight plates), surface treatment such as black oxide or zinc plating, and branded packaging. Send your drawing or sample for engineering review.

How do I select the correct heavy duty chain for my application? Selection depends on three factors: the required power or load, the operating speed, and the environment. First, determine the drive power or load and apply the appropriate service factor. Second, check the maximum allowable speed for the chain number. Third, account for the environment — for corrosive or washdown conditions, consider a coated or stainless steel variant. Send your application details and our engineers will recommend the correct chain number and strand configuration.

Still Have Questions About Heavy Duty Roller Chains?

Send your chain number, strand configuration and application details — our engineers will confirm the correct model and price for your order.

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