Product Description

Basic Info

ANSI NO:  

 

120-2R

DIN/ISO NO:  

24A-2

Pitch (mm):

38.100

Roller Diameter(mm):

 

22.23

Pin Diameter(mm): 

 

11.10

Plate Thickness (mm):

 

4.80

Inner Plate Width (mm):

 

25.22

Average Tensile Strength:

 

326.2KN

Chain Size:

 

5F, 10F, 5Meters

Weight / Meter (kgs/m):

 

5.62

Origin:

HangZhou China

HS Code:

7315119000

1. Providing 10 series more than 8000 models of chains,Heavy duty engineering chains, oil field chains, heavy duty  port crane chains, metallurgy conveyor chains, ultra-high tension escalator chains, mining chains, etc, and  customized solutions. 

2. More than 80% of our roller chain are exported to all over the world, We are serving customers of top 5 of world famous manufacturers , and more than 90% of our turnover are from the cooperation with the manufacturers in the world.   

3. Having advanced online inspection for automatic assembly lines.  

4. Having nation level Enterprise Technology Center,  we cost no less than 13% of our annual turnover investment in R&D  each year.

5. Having our own Standardization Management Committee in our company, and participated in the formulation and modification of the roller chain standards of the People’s Republic of China.

SMCC roller chain is 1 of the most widely used and welcome products in the market. Its continuous innovative development is suitable to be the solutions for many conditions, standard roller chains, motorcycle driving chain, O-ring motorcycle chain, high strength roller chain, conveyor chains, agricultural driving chain, galvanized chain, nickel-plated chain, lubrication-free chain and oilfield chain etc
Our CZPT chain was produced by machinery processing from raw materials to finished products and a full set of quality testing equipment. Mechanical processing equipment include grinding machines, high speed punching machines, milling machines, high speed automatic rolling and assembling machine. Heat treatment was processed by continuous mesh belt conveyor furnace, mesh belt conveyor annealing furnace, advanced central control system of heat treatment, rotary CZPT for chain component heat treatment, which ensure the stability and consistency of the key function of chain components.
We are the best suppliers of Chinese largest palletizing robot enterprises. These items are durable quality with affordable prices, replace of Japan chains, ZheJiang chains exported to Europe, America, Asia and other countries and regions.
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ROLLER CHAIN

Roller chain or bush roller chain is the type of chain drive most commonly used for transmission of mechanical power on many kinds of domestic, industrial and agricultural machinery, including conveyors, wire- and tube-drawing machines, printing presses, cars, motorcycles, and bicycles. It consists of a series of short cylindrical rollers held together by side links. It is driven by a toothed wheel called a sprocket. It is a simple, reliable, and efficient means of power transmission.

CONSTRUCTION OF THE CHAIN

Two different sizes of roller chain, showing construction.
There are 2 types of links alternating in the bush roller chain. The first type is inner links, having 2 inner plates held together by 2 sleeves or bushings upon which rotate 2 rollers. Inner links alternate with the second type, the outer links, consisting of 2 outer plates held together by pins passing through the bushings of the inner links. The “bushingless” roller chain is similar in operation though not in construction; instead of separate bushings or sleeves holding the inner plates together, the plate has a tube stamped into it protruding from the hole which serves the same purpose. This has the advantage of removing 1 step in assembly of the chain.

The roller chain design reduces friction compared to simpler designs, resulting in higher efficiency and less wear. The original power transmission chain varieties lacked rollers and bushings, with both the inner and outer plates held by pins which directly contacted the sprocket teeth; however this configuration exhibited extremely rapid wear of both the sprocket teeth, and the plates where they pivoted on the pins. This problem was partially solved by the development of bushed chains, with the pins holding the outer plates passing through bushings or sleeves connecting the inner plates. This distributed the wear over a greater area; however the teeth of the sprockets still wore more rapidly than is desirable, from the sliding friction against the bushings. The addition of rollers surrounding the bushing sleeves of the chain and provided rolling contact with the teeth of the sprockets resulting in excellent resistance to wear of both sprockets and chain as well. There is even very low friction, as long as the chain is sufficiently lubricated. Continuous, clean, lubrication of roller chains is of primary importance for efficient operation as well as correct tensioning.

LUBRICATION

Many driving chains (for example, in factory equipment, or driving a camshaft inside an internal combustion engine) operate in clean environments, and thus the wearing surfaces (that is, the pins and bushings) are safe from precipitation and airborne grit, many even in a sealed environment such as an oil bath. Some roller chains are designed to have o-rings built into the space between the outside link plate and the inside roller link plates. Chain manufacturers began to include this feature in 1971 after the application was invented by Joseph Montano while working for Whitney Chain of Hartford, Connecticut. O-rings were included as a way to improve lubrication to the links of power transmission chains, a service that is vitally important to extending their working life. These rubber fixtures form a barrier that holds factory applied lubricating grease inside the pin and bushing wear areas. Further, the rubber o-rings prevent dirt and other contaminants from entering inside the chain linkages, where such particles would otherwise cause significant wear.[citation needed]

There are also many chains that have to operate in dirty conditions, and for size or operational reasons cannot be sealed. Examples include chains on farm equipment, bicycles, and chain saws. These chains will necessarily have relatively high rates of wear, particularly when the operators are prepared to accept more friction, less efficiency, more noise and more frequent replacement as they neglect lubrication and adjustment.

Many oil-based lubricants attract dirt and other particles, eventually forming an CZPT paste that will compound wear on chains. This problem can be circumvented by use of a “dry” PTFE spray, which forms a solid film after application and repels both particles and moisture.

VARIANTS DESIGN

Layout of a roller chain: 1. Outer plate, 2. Inner plate, 3. Pin, 4. Bushing, 5. Roller
If the chain is not being used for a high wear application (for instance if it is just transmitting motion from a hand-operated lever to a control shaft on a machine, or a sliding door on an oven), then 1 of the simpler types of chain may still be used. Conversely, where extra strength but the smooth drive of a smaller pitch is required, the chain may be “siamesed”; instead of just 2 rows of plates on the outer sides of the chain, there may be 3 (“duplex”), 4 (“triplex”), or more rows of plates running parallel, with bushings and rollers between each adjacent pair, and the same number of rows of teeth running in parallel on the sprockets to match. Timing chains on automotive engines, for example, typically have multiple rows of plates called strands.

Roller chain is made in several sizes, the most common American National Standards Institute (ANSI) standards being 40, 50, 60, and 80. The first digit(s) indicate the pitch of the chain in eighths of an inch, with the last digit being 0 for standard chain, 1 for lightweight chain, and 5 for bushed chain with no rollers. Thus, a chain with half-inch pitch would be a #40 while a #160 sprocket would have teeth spaced 2 inches apart, etc. Metric pitches are expressed in sixteenths of an inch; thus a metric #8 chain (08B-1) would be equivalent to an ANSI #40. Most roller chain is made from plain carbon or alloy steel, but stainless steel is used in food processing machinery or other places where lubrication is a problem, and nylon or brass are occasionally seen for the same reason.

Roller chain is ordinarily hooked up using a master link (also known as a connecting link), which typically has 1 pin held by a horseshoe clip rather than friction fit, allowing it to be inserted or removed with simple tools. Chain with a removable link or pin is also known as cottered chain, which allows the length of the chain to be adjusted. Half links (also known as offsets) are available and are used to increase the length of the chain by a single roller. Riveted roller chain has the master link (also known as a connecting link) “riveted” or mashed on the ends. These pins are made to be durable and are not removable.

USE

An example of 2 ‘ghost’ sprockets tensioning a triplex roller chain system
Roller chains are used in low- to mid-speed drives at around 600 to 800 feet per minute; however, at higher speeds, around 2,000 to 3,000 feet per minute, V-belts are normally used due to wear and noise issues.
A bicycle chain is a form of roller chain. Bicycle chains may have a master link, or may require a chain tool for removal and installation. A similar but larger and thus stronger chain is used on most motorcycles although it is sometimes replaced by either a toothed belt or a shaft drive, which offer lower noise level and fewer maintenance requirements.
The great majority of automobile engines use roller chains to drive the camshaft(s). Very high performance engines often use gear drive, and starting in the early 1960s toothed belts were used by some manufacturers.
Chains are also used in forklifts using hydraulic rams as a pulley to raise and lower the carriage; however, these chains are not considered roller chains, but are classified as lift or leaf chains.
Chainsaw cutting chains superficially resemble roller chains but are more closely related to leaf chains. They are driven by projecting drive links which also serve to locate the chain CZPT the bar.

Sea Harrier FA.2 ZA195 front (cold) vector thrust nozzle – the nozzle is rotated by a chain drive from an air motor
A perhaps unusual use of a pair of motorcycle chains is in the Harrier Jump Jet, where a chain drive from an air motor is used to rotate the movable engine nozzles, allowing them to be pointed downwards for hovering flight, or to the rear for normal forward flight, a system known as Thrust vectoring.

WEAR

 

The effect of wear on a roller chain is to increase the pitch (spacing of the links), causing the chain to grow longer. Note that this is due to wear at the pivoting pins and bushes, not from actual stretching of the metal (as does happen to some flexible steel components such as the hand-brake cable of a motor vehicle).

With modern chains it is unusual for a chain (other than that of a bicycle) to wear until it breaks, since a worn chain leads to the rapid onset of wear on the teeth of the sprockets, with ultimate failure being the loss of all the teeth on the sprocket. The sprockets (in particular the smaller of the two) suffer a grinding motion that puts a characteristic hook shape into the driven face of the teeth. (This effect is made worse by a chain improperly tensioned, but is unavoidable no matter what care is taken). The worn teeth (and chain) no longer provides smooth transmission of power and this may become evident from the noise, the vibration or (in car engines using a timing chain) the variation in ignition timing seen with a timing light. Both sprockets and chain should be replaced in these cases, since a new chain on worn sprockets will not last long. However, in less severe cases it may be possible to save the larger of the 2 sprockets, since it is always the smaller 1 that suffers the most wear. Only in very light-weight applications such as a bicycle, or in extreme cases of improper tension, will the chain normally jump off the sprockets.

The lengthening due to wear of a chain is calculated by the following formula:

M = the length of a number of links measured

S = the number of links measured

P = Pitch

In industry, it is usual to monitor the movement of the chain tensioner (whether manual or automatic) or the exact length of a drive chain (one rule of thumb is to replace a roller chain which has elongated 3% on an adjustable drive or 1.5% on a fixed-center drive). A simpler method, particularly suitable for the cycle or motorcycle user, is to attempt to pull the chain away from the larger of the 2 sprockets, whilst ensuring the chain is taut. Any significant movement (e.g. making it possible to see through a gap) probably indicates a chain worn up to and beyond the limit. Sprocket damage will result if the problem is ignored. Sprocket wear cancels this effect, and may mask chain wear.

CHAIN STRENGTH

The most common measure of roller chain’s strength is tensile strength. Tensile strength represents how much load a chain can withstand under a one-time load before breaking. Just as important as tensile strength is a chain’s fatigue strength. The critical factors in a chain’s fatigue strength is the quality of steel used to manufacture the chain, the heat treatment of the chain components, the quality of the pitch hole fabrication of the linkplates, and the type of shot plus the intensity of shot peen coverage on the linkplates. Other factors can include the thickness of the linkplates and the design (contour) of the linkplates. The rule of thumb for roller chain operating on a continuous drive is for the chain load to not exceed a mere 1/6 or 1/9 of the chain’s tensile strength, depending on the type of master links used (press-fit vs. slip-fit)[citation needed]. Roller chains operating on a continuous drive beyond these thresholds can and typically do fail prematurely via linkplate fatigue failure.

The standard minimum ultimate strength of the ANSI 29.1 steel chain is 12,500 x (pitch, in inches)2. X-ring and O-Ring chains greatly decrease wear by means of internal lubricants, increasing chain life. The internal lubrication is inserted by means of a vacuum when riveting the chain together.

CHAIN STHangZhouRDS

Standards organizations (such as ANSI and ISO) maintain standards for design, dimensions, and interchangeability of transmission chains. For example, the following Table shows data from ANSI standard B29.1-2011 (Precision Power Transmission Roller Chains, Attachments, and Sprockets) developed by the American Society of Mechanical Engineers (ASME). See the references[8][9][10] for additional information.

ASME/ANSI B29.1-2011 Roller Chain Standard SizesSizePitchMaximum Roller DiameterMinimum Ultimate Tensile StrengthMeasuring Load25

ASME/ANSI B29.1-2011 Roller Chain Standard Sizes
Size Pitch Maximum Roller Diameter Minimum Ultimate Tensile Strength Measuring Load
25 0.250 in (6.35 mm) 0.130 in (3.30 mm) 780 lb (350 kg) 18 lb (8.2 kg)
35 0.375 in (9.53 mm) 0.200 in (5.08 mm) 1,760 lb (800 kg) 18 lb (8.2 kg)
41 0.500 in (12.70 mm) 0.306 in (7.77 mm) 1,500 lb (680 kg) 18 lb (8.2 kg)
40 0.500 in (12.70 mm) 0.312 in (7.92 mm) 3,125 lb (1,417 kg) 31 lb (14 kg)
50 0.625 in (15.88 mm) 0.400 in (10.16 mm) 4,880 lb (2,210 kg) 49 lb (22 kg)
60 0.750 in (19.05 mm) 0.469 in (11.91 mm) 7,030 lb (3,190 kg) 70 lb (32 kg)
80 1.000 in (25.40 mm) 0.625 in (15.88 mm) 12,500 lb (5,700 kg) 125 lb (57 kg)
100 1.250 in (31.75 mm) 0.750 in (19.05 mm) 19,531 lb (8,859 kg) 195 lb (88 kg)
120 1.500 in (38.10 mm) 0.875 in (22.23 mm) 28,125 lb (12,757 kg) 281 lb (127 kg)
140 1.750 in (44.45 mm) 1.000 in (25.40 mm) 38,280 lb (17,360 kg) 383 lb (174 kg)
160 2.000 in (50.80 mm) 1.125 in (28.58 mm) 50,000 lb (23,000 kg) 500 lb (230 kg)
180 2.250 in (57.15 mm) 1.460 in (37.08 mm) 63,280 lb (28,700 kg) 633 lb (287 kg)
200 2.500 in (63.50 mm) 1.562 in (39.67 mm) 78,175 lb (35,460 kg) 781 lb (354 kg)
240 3.000 in (76.20 mm) 1.875 in (47.63 mm) 112,500 lb (51,000 kg) 1,000 lb (450 kg

For mnemonic purposes, below is another presentation of key dimensions from the same standard, expressed in fractions of an inch (which was part of the thinking behind the choice of preferred numbers in the ANSI standard):

Pitch (inches) Pitch expressed
in eighths
ANSI standard
chain number
Width (inches)
14 28 25 18
38 38 35 316
12 48 41 14
12 48 40 516
58 58 50 38
34 68 60 12
1 88 80 58

Notes:
1. The pitch is the distance between roller centers. The width is the distance between the link plates (i.e. slightly more than the roller width to allow for clearance).
2. The right-hand digit of the standard denotes 0 = normal chain, 1 = lightweight chain, 5 = rollerless bushing chain.
3. The left-hand digit denotes the number of eighths of an inch that make up the pitch.
4. An “H” following the standard number denotes heavyweight chain. A hyphenated number following the standard number denotes double-strand (2), triple-strand (3), and so on. Thus 60H-3 denotes number 60 heavyweight triple-strand chain.
 A typical bicycle chain (for derailleur gears) uses narrow 1⁄2-inch-pitch chain. The width of the chain is variable, and does not affect the load capacity. The more sprockets at the rear wheel (historically 3-6, nowadays 7-12 sprockets), the narrower the chain. Chains are sold according to the number of speeds they are designed to work with, for example, “10 speed chain”. Hub gear or single speed bicycles use 1/2″ x 1/8″ chains, where 1/8″ refers to the maximum thickness of a sprocket that can be used with the chain.

Typically chains with parallel shaped links have an even number of links, with each narrow link followed by a broad one. Chains built up with a uniform type of link, narrow at 1 and broad at the other end, can be made with an odd number of links, which can be an advantage to adapt to a special chainwheel-distance; on the other side such a chain tends to be not so strong.

Roller chains made using ISO standard are sometimes called as isochains.

 

WHY CHOOSE US 

1. Reliable Quality Assurance System
2. Cutting-Edge Computer-Controlled CNC Machines
3. Bespoke Solutions from Highly Experienced Specialists
4. Customization and OEM Available for Specific Application
5. Extensive Inventory of Spare Parts and Accessories
6. Well-Developed Worldwide Marketing Network
7. Efficient After-Sale Service System

 

The 219 sets of advanced automatic production equipment provide guarantees for high product quality. The 167 engineers and technicians with senior professional titles can design and develop products to meet the exact demands of customers, and OEM customizations are also available with us. Our sound global service network can provide customers with timely after-sales technical services.

We are not just a manufacturer and supplier, but also an industry consultant. We work pro-actively with you to offer expert advice and product recommendations in order to end up with a most cost effective product available for your specific application. The clients we serve worldwide range from end users to distributors and OEMs. Our OEM replacements can be substituted wherever necessary and suitable for both repair and new assemblies.

 

 
   

Three important aspects of the drive chain

One of the advantages of a drive chain is that it is relatively light. It sends nearly all of the engine’s power to the rear wheels, even if it loses some power along the way. Engine power on a dyno is different than on the road. Therefore, the chain is the most efficient way to transmit power to the rear wheel. Let’s look at 3 important aspects of the drive chain. Here are some facts about them.

roller chain drive

When choosing a roller chain drive, consider your application and how much horsepower your system requires. For applications requiring more horsepower, a multi-strand drive is an option. If your horsepower is limited, single-strand drives are a good choice. Otherwise, you may need to choose the smallest pitch chain. However, this may not always be possible. You should also consider sprocket size. In many cases, choosing a smaller chain pitch can increase the number of options.
While proper lubrication and maintenance can last a roller chain drive for years, regular inspections are essential to prolonging its life. After the drive has been operating for 100 hours, a thorough inspection every 500 hours is recommended. During this inspection, look for key elements such as 3% elongation and chain wear. If the chain is not preloaded, elongation will happen very quickly. In either case, the industry-recommended 3% elongation will be achieved faster.
chain

flat top chain

The flat-top chain system consists of hinge pins that support the chain to ensure efficient conveying. There are different types of hinge pins available, namely single and double. The single hinge pin is suitable for short chainplates and lightly loaded products. Dual hinge pins provide increased stability and load capacity. Flat top drive chains can be used in many different industries. In this article, we will learn about some important properties of flat-top chains.
Plastic flat top chains can transport medium to large workpiece pallets. They have a circular arc function that enables continuous drive combinations involving curved circular arcs. Plastic flat top chains are also recommended for workpiece pallets with PA wear pads. Steel flat-top chains can withstand surface loads up to 1.5 kg/cm, and HD profiles are suitable for steel chains. This chain is used in a variety of applications, including packaging machines.

mute chain

There are several types of mufflers that can silence your drive chain. One is the Ramsay silent chain, also known as the inverted tooth chain. These chains can be custom designed for specific needs. Exclusive Australian distributor of CZPT products that can help you find the most effective and affordable silent chain. In addition to silent chains, CZPT also manufactures sprockets and other hardware required for the drive.
Another type of mute chain is the CZPT chain. CZPT chains have involute teeth, while the ANSI standard specifies straight teeth. The advantage of silent chains is reduced noise and vibration output, and wider chains are more economical than multi-strand roller chains. The downside of silent chains is that they wear out quickly without lubrication.
The mute chain consists of 2 main parts, the pin and the plate. The pins are rotated in the same direction and positioned so that they can only engage the sprocket from 1 direction. Therefore, mute links are not recommended for reverse applications. To find out if your chain will work in reverse, consult the manufacturer’s catalog. CZPT chain.

conveyor chain

Drive chains and conveyor chains are essentially the same, but they are very different. The transmission chain is mainly used to transport heavy objects, and the conveyor chain is used to transport light objects. On the other hand, drive chains are usually driven by belts. Both types of chains can be used for the same purpose. This article will cover both types of chains. You can use them to convey various types of materials and products.
There are some differences between belts and chains, but both types can perform similar functions. The drive chain is used to drive the rollers, while the belt is used to move the object horizontally. The drive chain usually drives the rollers that move the conveyor belt. For a wide range of applications, conveyors and drive chains can be customized to meet specific needs. Here are some common uses of these 2 chains:
chain

time chain

Timing chains fail for 2 reasons: complete damage and fatigue. Fatigue occurs when a timing chain reaches its breaking strength, and eventually, failure occurs when a timing chain exceeds its design life and suffers mechanical damage. Most timing chain failures are a combination of mechanical failure and fatigue. Chain chatter, engine misfires, and VVT systems can accelerate chain fatigue. If these causes of premature timing chain failure are not addressed, the timing chain could be permanently damaged.
In the past, the timing chain was the only drive chain available. Timing belts are a quieter alternative, but they are prone to failure and damage to valves and the engine. In recent years, OEM manufacturers have begun to return to the OHC/DOHC drive chain of the timing chain. This type of drive chain has many advantages, including the ability to simulate knock sensor vibrations. Additionally, the chain has better NVH performance, making it the drive chain of choice for automakers.

Timing Chains in Internal Combustion Engines

Internal combustion engines use timing chains to control intake and exhaust valves. The chain turns the camshaft at the right time and coordinates the movement of the valves on the cylinder head. This in turn allows the engine to generate power. The timing chain also controls the position of the intake and exhaust valves, ensuring that fuel and exhaust gases are expelled at the correct time. Incorrect timing in the vehicle can lead to misfires and other problems.
Chain drives in internal combustion engines are a common feature of many modern cars. It transmits rotational force from the crankshaft to the camshaft, which in turn controls the opening and closing of valves. The chain is lubricated with oil to prevent wear. Therefore, timing chains are often used in high-capacity engines, including trucks and motorcycles. But they do have some drawbacks.
A weakened timing chain can cause the engine to misfire, causing it to skip gears and lose coordination. A clicking sound may also indicate a problem. If the chain is too loose, it can also cause the engine to stall. If the chain is too loose, metal chips will appear in the oil. A clicking sound may also be heard when the engine is running. If you hear the engine stalling, it’s likely that the timing chain is the culprit.

Silent chains in internal combustion engines

The pitch difference between the drive sprocket and the silent chain reduces resonance sound, meshing shock, and accelerated wear at the chain and sprocket interface. The difference in pitch between the drive sprocket and the silent chain determines the loudness of the sound, and the system described here helps reduce it. The present invention is suitable for power transmission in internal combustion engines.
The earliest designs for silent chains come from the 1500s when Leonardo da Vinci sketched them. The SS Britannia propels the boat across the Atlantic using huge silent chains. By the mid-19th century, silent chains were used in nearly all types of industrial applications and as timing chains for early automobile engines. Due to their durability, these chains are durable and have smooth action.
In order to understand the mechanism of frictional losses in chains, various parameters must be considered. Speed, pitch, temperature and tension are the main parameters affecting friction loss. This test uses 2 types of chains to compare the frictional behavior between these 2 components. The results show that a single chain with a high pitch can increase the friction torque of another chain with the same pitch. These results provide an important basis for understanding the role of friction torque in internal combustion engines.
chain

lifting chain

Lift chairs are designed to lift heavy objects and can be used with a variety of lifting equipment, including forklifts and cranes. Hoist chains are also used in warehouses and ports of all sizes and consist of a series of pins and plates that mesh with each other to move heavy loads. ​​​CZPT Chain manufactures high-precision lifting chains. Here are some of the benefits of hoist chains for drive chains.
Blade Chain: This type of drive chain has a patented U-profile that turns the flexible chain into a highly stable outer post during the push phase. This design is designed to minimize linkage tangling and provide better pressure transfer. These chains are used for cranes, anchors and straddle carriers. Blade chains are more durable than other types of drive chains and are especially useful in heavy duty applications.
The drive chain is also available in a variety of materials. For example, square link chains are commonly used in cranes and hoists. They are cheap to manufacture but more prone to overloading. Conveyor chains are specially designed for chain conveyor systems. It consists of a series of interconnected rectangular links. Oval links tend to kink and are usually only used at low speeds.

China wholesaler Chain Manufacturer DIN/ANSI/ASME Standard Short-Pitch 24A-2 Precision Motorcycle Parts Timing Teeth General Hardware Roller Chains     with Great qualityChina wholesaler Chain Manufacturer DIN/ANSI/ASME Standard Short-Pitch 24A-2 Precision Motorcycle Parts Timing Teeth General Hardware Roller Chains     with Great quality