China high quality Industrial Transmission Gear Reducer Conveyor Parts Transmission Customized Lumber Conveyor Chains and Attachments 3939 Series near me factory

Product Description

Chain No. Pitch Roller diameter Width between inner plates Pin dimension Plate dimension Plate thickness Ultimate tensile energy Common tensile strength Weight for every meter
P done max bone min dtwo max L
h2 max d3 max d4 max J
Q q
mm mm mm mm mm mm mm mm mm mm mm kN/ bf kN kg/m
3939-B4 203.2 23. 27. 11.1 forty nine. 28.58 7.two seven.2 101.six four. one hundred fifteen.58/26268 136.5 2.45
3939-B21 203.two 23. 27. forty nine. 28.58 7.two four. a hundred and fifteen.fifty eight/26268 136.five two.forty five
3939-B23 203.2 23. 27. eleven.1 forty nine. 28.fifty eight ten.three ninety two.1 four. 115.fifty eight/26268 136.five two.forty five
3939-B24 203.2 23. 27. forty nine. 28.fifty eight seven.two a hundred and one.six 4. 115.fifty eight/26268 136.five two.48
3939-B40 203.two 23. 27. 11.1 49. 28.58 ten.3 101.6 four. 115.58/26268 136.5 2.forty five
3939-B43 203.2 23. 27. eleven.1 49. 28.fifty eight 7.two 10.three 4. a hundred and fifteen.fifty eight/26268 136.5 two.forty two
3939-B44 203.two 23. 27. forty nine. 28.fifty eight 7.2 10.three 101.six 4. one hundred fifteen.fifty eight/26268 136.five 2.45
3939H-B4 203.2 23. 27. 58. 28.60 seven.2 38. 102. six.four one hundred fifty.00/34082 172.5 three.51


Roller chain or bush roller chain is the variety of chain drive most generally utilised for transmission of mechanical electricity on a lot of varieties of domestic, industrial and agricultural equipment, like conveyors, wire- and tube-drawing devices, printing presses, cars, motorcycles, and bicycles. It consists of a series of short cylindrical rollers held jointly by side hyperlinks. It is pushed by a toothed wheel named a sprocket. It is a simple, reliable, and productive signifies of electricity transmission.


Two diverse measurements of roller chain, displaying construction.
There are 2 varieties of backlinks alternating in the bush roller chain. The very first sort is internal back links, getting 2 inner plates held together by 2 sleeves or bushings on which rotate 2 rollers. Internal hyperlinks alternate with the 2nd kind, the outer back links, consisting of 2 outer plates held collectively by pins passing through the bushings of the interior back links. The “bushingless” roller chain is equivalent in operation although not in development alternatively of different bushings or sleeves keeping the interior plates together, the plate has a tube stamped into it protruding from the hole which serves the same function. This has the gain of eliminating 1 phase in assembly of the chain.

The roller chain layout decreases friction in contrast to easier styles, ensuing in larger performance and considerably less dress in. The first power transmission chain kinds lacked rollers and bushings, with both the interior and outer plates held by pins which immediately contacted the sprocket teeth however this configuration exhibited extremely fast use of the two the sprocket tooth, and the plates where they pivoted on the pins. This issue was partially solved by the growth of bushed chains, with the pins holding the outer plates passing through bushings or sleeves connecting the interior plates. This dispersed the dress in over a greater spot even so the enamel of the sprockets nonetheless wore much more quickly than is attractive, from the sliding friction from the bushings. The addition of rollers surrounding the bushing sleeves of the chain and presented CZPT contact with the teeth of the sprockets resulting in exceptional resistance to use of each sprockets and chain as effectively. There is even very reduced friction, as prolonged as the chain is adequately lubricated. Ongoing, clear, lubrication of roller chains is of main relevance for effective procedure as effectively as appropriate tensioning.


Several driving chains (for instance, in factory tools, or driving a camshaft inside of an inside combustion motor) run in thoroughly clean environments, and hence the donning surfaces (that is, the pins and bushings) are protected from precipitation and airborne grit, numerous even in a sealed environment such as an oil bath. Some roller chains are made to have o-rings constructed into the room between the outside the house url plate and the inside roller website link plates. Chain producers started to contain this attribute in 1971 soon after the software was invented by Joseph Montano even though working for Whitney Chain of Hartford, Connecticut. O-rings ended up provided as a way to improve lubrication to the hyperlinks of energy transmission chains, a service that is vitally important to extending their working lifestyle. These rubber fixtures form a barrier that retains manufacturing facility used lubricating grease within the pin and bushing dress in regions. Even more, the rubber o-rings stop filth and other contaminants from coming into inside the chain linkages, exactly where these kinds of particles would or else trigger significant dress in.[citation required]

There are also several chains that have to operate in soiled conditions, and for size or operational reasons cannot be sealed. Illustrations consist of chains on farm gear, bicycles, and chain saws. These chains will necessarily have fairly substantial prices of dress in, particularly when the operators are ready to accept much more friction, considerably less performance, much more sounds and much more regular CZPT as they neglect lubrication and adjustment.

Several oil-based lubricants draw in filth and other particles, ultimately forming an CZPT paste that will compound wear on chains. This issue can be circumvented by use of a “dry” PTFE spray, which types a solid film soon after software and repels both particles and dampness.


Chains running at high speeds similar to people on motorcycles must be utilized in conjunction with an oil bathtub. For CZPT motorcycles this is not achievable, and most motorbike chains run unprotected. Thus, motorcycle chains tend to use very speedily relative to other programs. They are topic to intense forces and are exposed to rain, dust, sand and road salt.

Bike chains are part of the drive practice to transmit the motor energy to the back again wheel. Properly lubricated chains can attain an effectiveness of 98% or greater in the transmission. Unlubricated chains will substantially decrease performance and boost chain and sprocket wear.

Two sorts of aftermarket lubricants are offered for motorbike chains: spray on lubricants and oil drip feed programs.

Spray lubricants may incorporate wax or PTFE. While these lubricants use tack additives to remain on the chain they can also attract filth and sand from the road and over time create a grinding paste that accelerates component wear.
Oil drip feed systems continuously lubricate the chain and use light-weight oil that does not adhere to the chain. Study has shown that oil drip feed programs supply the biggest put on defense and greatest energy conserving.

VARIANTS Design and style

Layout of a roller chain: 1. Outer plate, 2. Inner plate, 3. Pin, 4. Bushing, 5. Roller
If the chain is not currently being utilised for a high wear application (for occasion if it is just transmitting movement from a hand-operated lever to a control shaft on a machine, or a sliding doorway on an oven), then 1 of the less difficult types of chain may possibly still be utilised. Conversely, where added strength but the easy generate of a smaller pitch is required, the chain may be “siamesed” as an alternative of just 2 rows of plates on the outer sides of the chain, there may possibly be 3 (“duplex”), 4 (“triplex”), or far more rows of plates managing parallel, with bushings and rollers in between every adjacent pair, and the exact same variety of rows of teeth working in parallel on the sprockets to match. Timing chains on automotive engines, for example, typically have multiple rows of plates referred to as strands.

Roller chain is made in many sizes, the most typical American Nationwide Standards Institute (ANSI) expectations becoming forty, 50, 60, and eighty. The 1st digit(s) indicate the pitch of the chain in eighths of an inch, with the last digit being 0 for normal chain, 1 for lightweight chain, and 5 for bushed chain with no rollers. Hence, a chain with 50 %-inch pitch would be a #40 whilst a #160 sprocket would have enamel spaced 2 inches apart, etc. Metric pitches are expressed in sixteenths of an inch therefore a metric #8 chain (08B-1) would be equivalent to an ANSI #forty. Most roller chain is created from plain carbon or alloy steel, but stainless metal is used in meals processing equipment or other places in which lubrication is a problem, and nylon or brass are at times seen for the identical purpose.

Roller chain is ordinarily hooked up using a master url (also recognized as a connecting url), which generally has 1 pin held by a horseshoe clip relatively than friction suit, allowing it to be inserted or taken out with easy tools. Chain with a removable hyperlink or pin is also known as cottered chain, which enables the length of the chain to be adjusted. Half back links (also acknowledged as offsets) are obtainable and are employed to improve the length of the chain by a single roller. Riveted roller chain has the grasp hyperlink (also acknowledged as a connecting link) “riveted” or mashed on the ends. These pins are made to be durable and are not detachable.


An illustration of 2 ‘ghost’ sprockets tensioning a triplex roller chain program
Roller chains are utilized in low- to mid-speed drives at close to 600 to 800 toes per minute even so, at greater speeds, close to 2,000 to 3,000 feet for every moment, V-belts are typically utilised because of to put on and sound problems.
A bicycle chain is a form of roller chain. Bicycle chains could have a master link, or might demand a chain resource for elimination and installation. A similar but more substantial and as a result stronger chain is used on most bikes although it is occasionally replaced by possibly a toothed belt or a shaft push, which offer you decrease sound level and fewer servicing requirements.
The wonderful greater part of vehicle engines use roller chains to travel the camshaft(s). Really large performance engines frequently use gear drive, and starting in the early sixties toothed belts have been utilised by some companies.
Chains are also utilised in forklifts employing hydraulic rams as a pulley to CZPT and reduce the carriage however, these chains are not deemed roller chains, but are categorized as carry or leaf chains.
Chainsaw cutting chains superficially resemble roller chains but are much more carefully related to leaf chains. They are driven by projecting generate hyperlinks which also serve to identify the chain on to the bar.

Sea Harrier FA.2 ZA195 front (cold) vector thrust nozzle – the nozzle is rotated by a chain push from an air motor
A possibly uncommon use of a pair of motorbike chains is in the Harrier Bounce Jet, exactly where a chain travel from an air motor is utilised to rotate the movable motor nozzles, permitting them to be pointed downwards for hovering flight, or to the rear for standard forward flight, a system identified as Thrust vectoring.

The effect of wear on a roller chain is to increase the pitch (spacing of the links), triggering the chain to grow longer. Observe that this is due to wear at the pivoting pins and bushes, not from true stretching of the metal (as does happen to some adaptable steel factors these kinds of as the hand-brake cable of a motor vehicle).
With CZPT chains it is unusual for a chain (other than that of a bicycle) to use until finally it breaks, given that a worn chain prospects to the speedy onset of use on the tooth of the sprockets, with supreme failure currently being the reduction of all the enamel on the sprocket. The sprockets (in particular the scaled-down of the two) suffer a grinding motion that puts a characteristic hook form into the pushed experience of the tooth. (This result is made even worse by a chain improperly tensioned, but is unavoidable no issue what care is taken). The worn tooth (and chain) no longer provides smooth transmission of electricity and this could turn into evident from the sound, the vibration or (in car engines making use of a timing chain) the variation in ignition timing noticed with a timing gentle. Each sprockets and chain must be changed in these circumstances, since a new chain on worn sprockets will not very last long. Nevertheless, in much less severe cases it may possibly be possible to conserve the more substantial of the 2 sprockets, since it is always the smaller sized 1 that suffers the most dress in. Only in extremely light-weight-fat applications these kinds of as a bicycle, or in intense situations of incorrect rigidity, will the chain typically soar off the sprockets.

The lengthening thanks to dress in of a chain is calculated by the adhering to formulation:

M = the duration of a number of backlinks calculated

S = the quantity of backlinks measured

P = Pitch

In business, it is typical to check the movement of the chain tensioner (regardless of whether handbook or automatic) or the precise length of a drive chain (1 rule of thumb is to substitute a roller chain which has elongated 3% on an adjustable travel or 1.5% on a fixed-heart drive). A simpler technique, particularly appropriate for the cycle or bike user, is to try to pull the chain absent from the more substantial of the 2 sprockets, whilst making certain the chain is taut. Any significant motion (e.g. making it feasible to see via a gap) possibly indicates a chain worn up to and over and above the restrict. Sprocket harm will end result if the issue is ignored. Sprocket wear cancels this influence, and may possibly mask chain dress in.


The lightweight chain of a bicycle with derailleur gears can snap (or instead, arrive aside at the aspect-plates, since it is regular for the “riveting” to fail first) because the pins inside are not cylindrical, they are barrel-shaped. Speak to amongst the pin and the bushing is not the standard line, but a point which permits the chain’s pins to operate its way through the bushing, and finally the roller, eventually triggering the chain to snap. This sort of development is essential since the equipment-shifting motion of this form of transmission calls for the chain to each bend sideways and to twist, but this can occur with the flexibility of such a narrow chain and fairly big free lengths on a bicycle.

Chain failure is much considerably less of a problem on hub-geared methods (e.g. Bendix 2-speed, Sturmey-Archer AW) since the parallel pins have a much larger wearing area in make contact with with the bush. The hub-gear technique also permits complete enclosure, a great aid to lubrication and security from grit.

CHAIN Toughness

The most frequent measure of roller chain’s energy is tensile strength. Tensile strength represents how a lot load a chain can endure below a one-time load before breaking. Just as critical as tensile power is a chain’s exhaustion energy. The crucial variables in a chain’s fatigue toughness is the good quality of steel utilised to CZPT the chain, the heat treatment method of the chain components, the top quality of the pitch gap fabrication of the linkplates, and the kind of shot furthermore the depth of shot peen coverage on the linkplates. Other elements can contain the thickness of the linkplates and the style (contour) of the linkplates. The rule of thumb for roller chain working on a continuous generate is for the chain load to not CZPT a mere 1/6 or 1/9 of the chain’s tensile toughness, depending on the type of grasp back links employed (push-in shape vs. slip-in shape)[quotation required]. Roller chains working on a continuous push beyond these thresholds can and generally do fall short prematurely by way of linkplate fatigue failure.

The common minimum greatest toughness of the ANSI 29.1 metal chain is 12,500 x (pitch, in inches)two. X-ring and O-Ring chains tremendously lessen put on by implies of inside lubricants, escalating chain existence. The internal lubrication is inserted by implies of a vacuum when riveting the chain collectively.


Specifications corporations (this sort of as ANSI and ISO) preserve standards for style, dimensions, and interchangeability of transmission chains. For example, the adhering to Desk exhibits data from ANSI regular B29.1-2011 (Precision Energy Transmission Roller Chains, Attachments, and Sprockets) developed by the American Modern society of Mechanical Engineers (ASME). See the references[8][9][ten] for extra details.

ASME/ANSI B29.1-2011 Roller Chain Regular SizesSizePitchMaximum Roller DiameterMinimum Final Tensile StrengthMeasuring Load25

ASME/ANSI B29.1-2011 Roller Chain Regular Dimensions
Dimension Pitch Maximum Roller Diameter Bare minimum Ultimate Tensile Energy Measuring Load
25 .250 in (6.35 mm) .130 in (3.thirty mm) 780 lb (350 kg) eighteen lb (8.2 kg)
35 .375 in (9.fifty three mm) .two hundred in (5.08 mm) one,760 lb (800 kg) 18 lb (8.2 kg)
forty one .500 in (twelve.70 mm) .306 in (7.77 mm) one,five hundred lb (680 kg) 18 lb (8.2 kg)
forty .500 in (12.70 mm) .312 in (7.ninety two mm) three,125 lb (1,417 kg) 31 lb (14 kg)
50 .625 in (15.88 mm) .four hundred in (ten.sixteen mm) four,880 lb (2,210 kg) forty nine lb (22 kg)
sixty .750 in (19.05 mm) .469 in (eleven.ninety one mm) 7,030 lb (3,a hundred ninety kg) 70 lb (32 kg)
eighty one.000 in (twenty five.forty mm) .625 in (fifteen.88 mm) 12,five hundred lb (5,seven hundred kg) 125 lb (fifty seven kg)
a hundred 1.250 in (31.75 mm) .750 in (19.05 mm) 19,531 lb (8,859 kg) 195 lb (88 kg)
one hundred twenty 1.five hundred in (38.ten mm) .875 in (22.23 mm) 28,one hundred twenty five lb (12,757 kg) 281 lb (127 kg)
a hundred and forty one.750 in (forty four.forty five mm) 1.000 in (25.40 mm) 38,280 lb (seventeen,360 kg) 383 lb (174 kg)
160 two.000 in (50.eighty mm) hundred twenty five in (28.58 mm) 50,000 lb (23,000 kg) 500 lb (230 kg)
a hundred and eighty two.250 in (57.fifteen mm) one.460 in (37.08 mm) sixty three,280 lb (28,seven hundred kg) 633 lb (287 kg)
two hundred 2.five hundred in (63.50 mm) 1.562 in (39.67 mm) seventy eight,175 lb (35,460 kg) 781 lb (354 kg)
240 three.000 in (76.twenty mm) 1.875 in (47.63 mm) 112,500 lb (51,000 kg) one,000 lb (450 kg

For mnemonic reasons, underneath is one more presentation of key proportions from the exact same common, expressed in fractions of an inch (which was portion of the thinking behind the choice of chosen numbers in the ANSI standard):

Pitch (inches) Pitch expressed
in eighths
ANSI standard
chain variety
Width (inches)
one4 2eight twofive oneeight
3eight 3eight 35 threesixteen
onetwo four8 41 14
one2 foureight 4 5sixteen
58 five8 five 3eight
three4 six8 6 onetwo
1 88 eight 58

1. The pitch is the distance among roller centers. The width is the length amongst the hyperlink plates (i.e. slightly far more than the roller width to enable for clearance).
two. The correct-hand digit of the standard denotes 0 = regular chain, 1 = lightweight chain, 5 = rollerless bushing chain.
3. The remaining-hand digit denotes the number of eighths of an inch that make up the pitch.
four. An “H” adhering to the normal amount denotes heavyweight chain. A hyphenated quantity following the regular number denotes double-strand (2), triple-strand (3), and so on. Thus 60H-3 denotes quantity 60 heavyweight triple-strand chain.
 A typical bicycle chain (for derailleur gears) employs narrow 1⁄2-inch-pitch chain. The width of the chain is variable, and does not affect the load ability. The more sprockets at the rear wheel (traditionally 3-6, today 7-twelve sprockets), the narrower the chain. Chains are sold according to the variety of speeds they are made to perform with, for case in point, “10 speed chain”. Hub equipment or solitary pace bicycles use 1/2″ x 1/8″ chains, the place 1/8″ refers to the greatest thickness of a sprocket that can be utilized with the chain.

Usually chains with parallel formed links have an even number of back links, with every single narrow website link followed by a broad 1.Chains developed up with a uniform type of url, slim at 1 and broad at the other stop, can be made with an odd amount of backlinks, which can be an gain to adapt to a special chainwheel-length on the other facet these kinds of a chain tends to be not so robust.

Roller chains produced employing ISO normal are at times named as isochains.

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The 219 sets of sophisticated automated generation equipment give ensures for large solution high quality. The 167 engineers and experts with senior expert titles can layout and produce merchandise to meet the actual needs of consumers, and OEM customizations are also accessible with us. Our audio world-wide services network can supply buyers with well timed after-product sales specialized services.

We are not just a maker and provider, but also an business expert. We perform pro-actively with you to provide skilled guidance and merchandise tips in buy to end up with a most expense successful solution available for your particular application. The clients we provide globally assortment from end end users to distributors and OEMs. Our OEM replacements can be substituted wherever necessary and ideal for equally fix and new assemblies.

The roller chain runs on rotating sprockets linked to the motor that drives the chain. In most roller chains, there are two types of links utilised alternately to make it operate. Inner be a part of (also referred to as roller join): The two internal plates are joined collectively by two sleeves or bushings below the two rollers. Outer ring (also referred to as pin ring): The two outer plates are pinned together, through the bushing of the inner ring.
The environment in which the roller chain is employed and the operate it performs will have an effect on which roller chain is employed and how usually you will need to have to substitute it. Rest confident that roller chains are one particular of the most effective and efficient possibilities for power transmission and transportation purposes. You will uncover roller chains most frequently utilized for mechanical electrical power transmission in industrial machinery and merchandise conveyance all through manufacturing services. Standard Industries: Meals, Beverage, Resources, Packaging, Automotive, Metals, Building, Mining

China high quality Industrial Transmission Gear Reducer Conveyor Parts Transmission Customized Lumber Conveyor Chains and Attachments 3939 Series     near me factory

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