Double Pitch Chain

Wolff Chain Drive: Your Professional Double Pitch Chain Manufacturer!

Qingdao Wolff Chain Drive Co.Ltd. is located in the industrial zone of the city, covering an area of about 10,000 square meters. Our factory has multiple workshops, which are used for different production links and product manufacturing. We continue to innovate, develop new products, meet all customer requirements, and have stable delivery times.

Our Advantages

Rich Experience & Production Market

Our company has a production history of more than 30 years, and our products have won unanimous praise from customers. Wolff chains are popular in Domestic and foreign markets such as the United States, South America, Europe, the Middle East, Southeast Asia and Africa markets.

Quality Control

Our products are produced and inspected strictly in accordance with GB, AISI, ASTM, API, JIS, BS so as to control and safeguard the quality of products. We adopt strict testing standards and processes to ensure that our products meet international standards and customer requirements. We have a professional quality inspection team to conduct comprehensive inspection and testing of each production batch.

Advanced Equipment

Our factory is equipped with advanced production equipment and technology, including automated production lines, CNC machine tools, laser cutting machines, etc. These equipment can efficiently complete the manufacturing and processing of products and improve production efficiency.

High Quality Product

All our products fully comply with international standards such as ISO\DIN\ANSI\BS\JIS. Wolff has successfully passed ISO9001 quality management system, SGS inspection and BV inspection certification.

Double Pitch Roller Chain
A double pitch roller chain is a type of roller chain with larger pitch (distance between the pins) compared to standard roller chains. In a double pitch roller chain, the pitch is twice the pitch...
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Double Strand ANSI Roller Chain
Double strand ANSI roller chain is a type of roller chain that consists of two parallel strands of roller chain. It is designed to provide increased strength and load capacity compared to single...
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Metric Double Pitch Chain
Metric Double Pitch Chain is a type of roller chain that has a longer pitch than standard roller chains. It is designed to be used in applications that require lower speeds and lighter loads, such...
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Introduction to Double Pitch Chain

Double Pitch Roller Chain has the same basic construction as Standard Roller Chain, but double pitch means the chain pitch is twice as long, has flat-shaped link plates, and longer attachments. They are ideally suited for light to medium duty material handling applications.

Basic Parts of Double Pitch Chain

Link Plate
The link plate is the component that bears the tension placed on the chain. Usually this is a repeated load, sometimes accompanied by shock. Therefore, the plate must not only have great static tensile strength, it must also hold up to the dynamic forces of load and shock.

Pin
The pin is subject to shearing and bending forces transmitted by the plate. At the same time, it forms a load-bearing part (together with the bush) when the chain flexes during sprocket engagement. Therefore, the pin needs high tensile and shear strength, resistance to bending, and must also have suffi cient endurance against shock and wear.

Bush
The bush is subject to complex forces from all parts, especially from the repetition of shock loads when the chain engages with the sprocket. Therefore, the bush needs extremely high shock resistance. In addition, the bush forms a load-bearing part together with the pin and as such requires great wear resistance.

Roller
The roller is subject to impact load as it mates with the sprocket tooth during engagement of the chain with the sprocket. After engagement, the roller changes its point of contact and balance. It is held between the sprocket tooth and bush, and moves on the tooth face whilst receiving a compression load. Therefore, it must be resistant to wear and still have strength against shock, fatigue and compression.

There are two types of rollers, S-roller (standard) and R-roller (oversized). The S-rollers are used in short-length and slow-speed conveying. The R-rollers are most commonly used for longer conveying applications. (RS35 is a bush chain and does not have rollers).

Roller Link
Two bushes are press fi t into two roller link plates and rollers are inserted to allow rotation around the outside of the bushes during operation. This is the same for single and for multi strand chains.

Pin Link and Intermediate Plate
The pin link consists of two pins that have been press fit into two pin link plates. In case of multi-strand roller chain up to size RF08B, an intermediate plate is added to the pin link. In case of multi strand roller chain above size RF08B, two intermediate plates are added to the pin link. The intermediate plates are slip fit for standard attachment chain.

Spring Clip and Cotter Pin
The spring clip prevent the link plate from becoming detached, with the cotter pin type being as an added security measure where there is as possibly of the clip being removed due to interference from chain guides or some other aspect of the application.

Styles of Double Pitch Chain

01/

Standard Style Double Pitch Roller Chain
Standard double pitch roller chains are supplied with straight sidebars and standardly sized rollers.

02/

A-Style Double Pitch Roller Chain
This series of double pitch roller chains are typically found in agricultural applications and light-duty conveyor applications.

03/

Oversized Roller Double Pitch Roller Chain
Double pitch roller chains with "oversized rollers" are manufactured with roller diameters that exceed the width of the side plates. This style is typically used in applications where there is a product resting on the top of the chain or where the rollers are used to keep the chain in a guide track.

04/

Metric Double Pitch Roller Chain
Metric double pitch chains share the same characteristics looks-wise as the A-Series but they meet ISO specifications and are high strength. These chains are specially designed and are typically found in equipment that was designed or manufactured in Europe.

05/

Hollow Pin Double Pitch Roller Chain
Hollow pin double pitch roller chain is used in a wide range of conveying and agricultural applications. There are also stainless steel double pitch roller chains for corrosive or high to low-temperature applications.

06/

Corrosion Resistant Double Pitch Roller Chain
Corrosion resistant double pitch chains are made of 304-grade stainless steel, nickel plated, dacromet coated, and zinc plated.

Advantages of Double Pitch Chain

High Efficiency

Double pitch roller chains are known for their high efficiency in power transmission, often exceeding 95-98%. This is due to the positive engagement between the chain and sprockets, which minimizes the risk of slippage and ensures accurate torque transfer.

Resistance to Slippage

The positive engagement between the double pitch roller chain and sprockets in chain-driven assemblies ensures a minimal risk of slippage, even under high torque or heavy loads. This characteristic is particularly beneficial in applications where precise motion control is necessary.

Load Capacity

Double pitch roller chains are capable of handling high loads, making them suitable for heavy-duty applications. The load-bearing capacity of a chain drive system is determined by the chain’s tensile strength and the sprocket design, which can be customized to cater to the specific requirements of an application.

Adaptability

Double pitch roller chain-driven assemblies can accommodate varying center distances between the input and output shafts, providing flexibility in system design. This adaptability allows for modifications to existing systems or the design of new systems with unique spatial constraints.

Application of Double Pitch Chain

Used in Food Applications
The double pitch roller chain is a popular choice in the food industry since it can withstand harsh temperatures and is easy to clean. Because the chain must be cleaned often in a setting that involves food handling, processing, or packaging, double pitch roller chains are the ideal option.

Applied in Temperature Resistant
Double pitch roller chains can endure temperatures as high as 400°C, as well as extreme cold temperatures as low as -20°C. This makes it a popular choice in environments where other metals or mechanical parts aren't appropriate.
Another reason this roller chain is selected is that it is very resistant to both alkali and acidic environments, which are common in certain sectors.

Rust Resistance
Double pitch roller chain made of stainless steel is recommended because it is highly resistant to both alkali and acidic environments, which are common in specific sectors. Furthermore, it has a low magnetic permeability. To counteract this, make sure the chain is secure. A properly oiled chain can reduce environmental exposure while also extending product life.

Heat-Treated - Pre-Stressed -Wear Resistance
Heat-treated for improved temperature resistance and stress-tested ahead of time to lessen the risk of premature breakage or stretching concerns.

FAQ

Q: What is a double pitch chain composed of?

A: Pin Link Plate: This is an outer plate on the pin link of roller chain. It can be straight or figure-8 shaped.
Roller Link Plate: This is an inner plate on the roller link of roller chain. It can be straight or figure-8 shaped.
Roller: This rotates on top of the bushing on the roller link.
Pin: This is press fit into the pin link plate and bisects the bushings in the roller link.
Bushing: This is press fit into two roller link plates and is bisected by the pin in the pin link.

Q: How to assess double pitch roller chain wear?

A: As a general rule, most double pitch roller chain drive applications can be considered to be worn out at a length increase of approximately 1.5%.
With regular use, some chain wear will eventually occur which will lead to an increase in chain length. If a sudden increase in elongation occurs, it will be important to check the tips of the sprocket teeth for indications of wear. Excessive elongation may be an indication that the chain and or sprockets have reached the end of their natural life and should be replaced.
It is also important that all lube free chain is regularly checked for wear.
Chain lubrication
Proper lubrication of double pitch roller chain drives is an important factor in getting the best possible performance from drive systems. No matter how well a transmission system is designed, if it is not properly lubricated its service life will be shortened. Incorrect or insufficient lubrication is one of the primary reasons for premature roller chain wear and eventual failure.
The key reason for lubricating the chain bearing surfaces is to minimise wear elongation of the chain components as a result of direct metal to metal contact resulting in increased friction. Chain elongation is primarily caused by wear between the bearing pin and bush during articulation. As well as preventing premature elongation, good lubrication also reduces noise levels and cools down the chain when running at high speed.
It is important to use the correct viscosity lubrication for roller chain. Generally heavy oils or grease are not suitable as a chain lubricant. Whilst many chain drives operate in normal ambient temperatures, some need to operate outside of these parameters often operating in higher or lower temperatures or damp conditions. In these environments it is vital that a lubricant that can operate effectively is selected.
Chain slack
Double pitch roller chain operates most effectively when there is a suitable amount of slack. If too much tension is applied, the oil film between the bearing surface areas (i.e. the pin and bush) can become restricted or broken, causing increased wear and damage to the bearing components.
If possible, the amount of slack should be 4% of the span (shaft centre distance between the drive and driven sprocket). In instances where the drive is vertical or close to vertical then it should be 2% maximum. A 2% ratio should also be applied for shaft centre distances exceeding 1 metre, when frequent starts are made or when sudden reverse motion takes place.
Double pitch roller chain will stretch slightly during its first few hours of service (by about 0.05%). This may result in too much slack and will require adjustment. Chain tensioners, where they can be fitted, are ideal for automatic take-up of the slack chain.

Q: How to select double pitch roller chain?

A: Double Pitch Roller Chains are selected according to the allowable roller load and maximum allowable tension.
When the attachments receive a large bending or twisting force, make sure the chain has adequate strength. In these cases, a larger-pitch roller chain is frequently used because it has a thicker plate and longer attachment.
In these chains, clearance between the components is small. Chain articulation is easily affected by dirt or contamination in the joints.

Q: How do I know whether the double pitch chain is too slack and what to do to deal with it?

A: Manually move the slack side of the double pitch chain – usually the span on the bottom – towards the other section of the chain. The distance between where it hangs and where you can move it with your hands is the chain slack.
Typically chain slack should be 4% of the center distance but can at times be as little as 2% depending on drive design. You need less slack if your drive layout is vertical – or nearly vertical – or if it has a long center distance. If the load is very heavy, the drive frequently starts and stops, or is a reversing drive, you also need less slack. Another consideration is the clearance of the chain within lubrication cases, safety shrouds, or other components of your drive.
You can adjust the center distance to increase tension, limiting your chain slack. Afterward, be sure to recheck the slack to make sure it was changed appropriately. A tensioner or idler is another solution for correcting chain slack issues.
Idler sprockets are an additional sprocket used to support the excess roller chain. Fixed center drives can use idlers to maintain tension since adjusting the center distance isn’t an option.

Q: What does the pitch of roller chain mean?

A: The pitch of a chain refers to the distance between its drive links.
It is determined by measuring the distance between any three consecutive drive links and dividing by two. Example: 3/4" divided by 2 = 3/8". Sometimes pitch is expressed as a fraction: 3/8" and sometimes it is expressed as a decimal: .404".
The pitch measurement of a saw chain tells a pro user about to the overall size of the saw chain. Usually a larger pitch indicates a heavier and bigger chain.

Q: What are the features of double pitch chain?

A: Double pitch chains are of the same size and specifications as the standard European and American chains ISO 606, except for the length of the pitch, which measures exactly double the standard equivalent.
Double pitch chains provide a low cost solution for applications where distances are greater and less speed and transmission power are required. Double pitch chains allow adjusting the rollers, considerably reducing the friction and tensile strength in many applications.
These chains are also a lighter weight and lower cost option, as they are made with less material, although they are manufactured with the same level of quality and precision as in single pitch chains.

Q: What is a double pitch chain used for?

A: Double pitch roller chain is a cost-efficient option for lighter applications, as it is manufactured to have twice the pitch of a standard roller chain, reducing the overall weight of the chain and the price.
Double pitch chains are often used for conveying items on a horizontal floor, and chains intended for this purpose have increased roller diameter equal to that of single pitch chains on the exact same pitch for improved load capacity and reduced traveling resistance.
Double pitch sprockets are used in conveyor systems that require precise product placement.
Double pitch conveyor series chains are ideally suited for light to medium duty material handling applications.
Double pitch conveyor series chains are ideally suited for light to medium duty material handling applications. These chains are similar to standard chain, except the plates are straight and the pitch is twice as long.

Q: What is the difference between a double-pitch chain and a single-pitch chain?

A: The accessories for single-pitch conveyor chains are mainly installed on A series chains, which derive conveyor chains with a pitch of 12.7-50.8 and an "eight"-shaped chain plate. The chain uses rollers to support rolling on the track. Due to the small diameter of the rollers, the load-bearing capacity and transmission efficiency are not as good as the large rollers, so it is only suitable for small conveyors with light load and short conveying distance. However, the conveying speed can be higher, the beat precision of conveying is better, and the overall structure is relatively compact.
Double-pitch chains and sprockets for transmission and conveying are suitable for general mechanical transmission or double-pitch chains for conveying, with a pitch of 25.4-76.2mm. The double-pitch chain is a light chain derived from doubling the pitch specified by the short-pitch chain. As a conveyor chain, it has three characteristics in structure than a Transmission Chain: (1) The shape of the chain piece is not a figure 8 but it is straight (2) The end of the chain plate is fan-shaped, not a semicircle (3) The roller is enlarged The large roller set has high load carrying capacity and transmission efficiency.

Q: What factors should be considered when choosing double pitch chain for transmission?

A: The following factors must be considered when selecting double pitch roller chains for transmission needs:
The power to be transmitted.
The speed and the diameters of the driving shaft and the driven shaft.
The distance between the centers of the shafts.

Q: What are the advantages of your double strand ANSI roller chain compared to single strand chain?

A: The double strand ANSI roller chains have several advantages over single strand chains. Firstly, they have a higher load-carrying capacity due to the presence of two parallel strands. This makes them suitable for heavy-duty applications that require the transmission of high torque and power.
Secondly, the double strand configuration provides better stability and reduces the risk of chain jumping or derailing. This is particularly important in applications where precise and smooth movement is required, such as in conveyors or automated machinery.
Furthermore, they are designed to withstand harsh operating conditions. They are resistant to wear, corrosion, and high temperatures, making them suitable for demanding environments.
These chains are available in various sizes and configurations to accommodate different load requirements.

As one of the leading double pitch chain manufacturers and suppliers in China, we warmly welcome you to wholesale cheap double pitch chain from our factory. All customized products are with high quality and low price. Contact us for quotation.

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