QXG250 Single Guide Roller Conveyor Chain with Fixed Hanger Plate

Hangzhou Ocean Industry Co., Ltd. is one of the leading manufacturers and suppliers of qxg250 single guide roller conveyor chain with fixed hanger plate in China. Welcome to wholesale bulk durable industrial chains and power transmission parts made in China here from our factory. All customized products are with high quality and competitive price.

With a 250 mm pitch and a 130 kN breaking load, the QXG250 sits one size above the 200 mm pitch range and is the point where a single-rail line stops running out of spacing. Pitch is what makes it different: hanger points stand further apart, so parts that were too bulky or too widely fixtured for the smaller series fit without a rework of the layout.

The fixed hanger plate is the other half of the product. It is forged as one piece with the link body rather than bolted on, which removes the joint that fails on a bolted bracket and gives the fixture a suspension geometry that does not drift as the line runs.

Below: what the three variants carry, what the one-piece hanger actually changes, how the pitch behaves on a real line, where the chain is used, how to choose between the variants, and how the order, the spares and the paperwork work. Figures come from the specification table; where an answer turns on your own layout, the page says so rather than generalising.

The table gives the reference figures for the three variants. What separates the columns is load class rather than design: pitch and hanger spacing are identical across them, while chain weight, allowable and breaking tension, single point load, wheel diameter, bearing size, permitted temperature and surface treatment step up.

Two rows carry most of the decision. Single point load is what one hanger may carry, at 100, 125 and 150 kg across the range. Allowable tensile force is the pull the chain may carry along the line, at 50, 65 and 75 kN. These are different quantities, and a line can be inside the first and outside the second once the loop is long or the gradients are steep.

The margin between allowable and breaking figures is roughly 1.7 to 1.8 across the three columns, so the working margin sits inside the allowable number rather than on top of it. Size the line on the allowable figure.

Hanger spacing is listed as 250+(250xN) on all three variants. Points therefore land on pitch multiples, and the spacing your process needs is obtained by choosing N. That matters on a line converted from a smaller pitch, because the process equipment is sized around a spacing rather than around a chain.

On temperature, the range separates the variants more than load does: 200 °C, 240 °C and 280 °C. The values were taken at a temperature of 20 °C and a relative humidity of 60%. A plant that operates outside that band should fix its variant and its finish against its own conditions rather than against the table. Pitch, hanger geometry and material can be built to order.

Note: every value above was taken at a temperature of 20 °C and a relative humidity of 60%. Pitch, hanger geometry and material can all be built to order, and the engineering department issues the complete data sheet on request.

The question this chain answers is a spacing question rather than a strength question. When a line needs hanger points further apart than a 200 mm pitch allows, or a per-point load above what the smaller series carries, the next pitch up is the straightforward answer - and the fixed hanger is what makes the change worth doing at the same time.

Bulky parts are the usual trigger. Automotive body panels, large appliance housings and oversized structural components do not fit within the intervals a 200 mm pitch creates, and forcing them onto it produces either contact between parts on the curves or fixture rods so long that they interfere with the track. A 250 mm pitch buys the interval.

The fixed hanger addresses a different problem: the connection itself. A bolted bracket has a joint, and a joint on a line running through an oven is a joint that cycles in temperature several times a day. What happens to bolted joints under that treatment is well understood, and it is the reason a one-piece forged hanger is specified on lines where a fixture dropping is a serious event rather than an inconvenience.

One point worth being clear about. The fixed hanger removes the bracket joint, not every source of suspension error. Track alignment, curve setting and take-up condition all still affect where a fixture sits, and a conversion to a fixed hanger on a badly aligned track will not deliver the geometry the design is capable of.

Load per point. Up to 150 kg on the HA variant, which covers large industrial workpieces that the smaller pitch range cannot take at one point.

No routine greasing. The bearings are sealed as the wheels are built, so standard conditions put no greasing on the schedule. The quoted field interval for inspection is 12 to 18 months, and on abrasive or wet duty that is the outside figure rather than the target.

One-piece hanger. The bracket is forged into the link, so there is no bolted joint to loosen and no separately assembled hanger to misalign. Suspension geometry stays consistent from the first link to the last and from one operating year to the next.

Temperature. Continuous operation up to 280 °C on the HA variant with the high-temperature bearing option, which covers curing ovens at the top of the range the coating industry uses.

A hanger plate forged as part of the link is a different component from one attached to it, and the difference shows up in three places: the load path, the geometry, and what there is to maintain.

The load path. In a forged one-piece link the load runs from the suspension point through the plate into the link body and on to the pin without crossing a joint. In an attached bracket the same load crosses a bolted or welded interface, and that interface is where stress concentrates and where a crack starts.

The geometry. Each plate extends from the link in a fixed orientation, the same on every link. Fixture design therefore works from a known datum rather than from a field measurement at each station, and a fixture made for one link fits the next one without adjustment.

What there is to maintain. A bolted bracket has a tightening schedule and a weld has an inspection schedule. A forged one-piece plate has neither, which reduces the maintenance scope rather than the maintenance interval - the wheel, pin and bushing checks do not go away.

On durability, the design has been taken through accelerated fatigue testing to beyond two million cycles without separation of the hanger plate. That is a test-bench result for the joint design rather than a service-life forecast for a line; the service life of the assembly is set by the wheel and pin wear items, not by the hanger.

A 250 mm pitch places fewer links under the same length of line, and that changes how the tensile load divides rather than simply raising it.

With fewer pin joints per metre, each joint sees a larger share of the total pull while the number of joints carrying it falls. The net effect is fewer joints in the load path and a more even distribution of stress across the ones that remain, which is why the allowable tension on this range (50 to 75 kN) is higher than on the 200 mm range for a comparable construction.

On the line, the spacing is what the operator notices. Hanger points stand further apart, so parts pass through curves with more room between them, and a fixture rod can be longer before it fouls the track or the neighbouring part. For vehicle doors, truck fenders and large machinery casings, that interval is the difference between a workable layout and one that has to be re-shimmed station by station.

The trade is at the curves. A wider pitch needs a larger radius: R750 to R900 horizontal against R600 to R700 on the smaller range, and R3200 to R4000 vertical. On a new line that is a layout decision taken once. On a conversion it is the thing to check first, because the building may not have the room the larger radius needs.

Every wheel runs on double-lip sealed bearings filled with a high-temperature synthetic grease. The standard 6205 and 6206 ball bearings cover operation up to 200 °C, and the 30205 tapered roller bearing in the HA variant extends that to 280 °C.

The tapered roller in the HA variant is a different load case rather than a cost upgrade. A vertical bend puts radial and axial load into the wheel together, which is not the task a deep groove ball bearing is designed for, and the heavier the load per point the more that combination matters.

What sealing buys on a coating line is specific. A wheel sits above the product and above the process, so anything that lands on it is process material: paint overspray, powder, rinse mist. Sealed bearings keep that out of the rolling elements, and the friction and noise figures quoted for the range - a coefficient below 0.004 and sound pressure below 65 dB(A) at rated load and speed - are measured on wheels in that condition rather than at the end of a service interval.

One caution applies to every sealed wheel: the seal is what fails first. Once a seal is breached the bearing is no longer a sealed bearing, so on abrasive or chemically aggressive duty the seals belong on the inspection schedule even though the bearings themselves need no greasing.

Three levels of corrosion protection are offered, and the choice follows the environment rather than the load.

Black epoxy electrophoretic coating is the standard finish, quoted at more than 200 hours of salt spray resistance. It fits a dry indoor paint shop, where the chain meets heat and paint mist rather than liquid.

Zinc plating under the coating adds a sacrificial layer for humid conditions. Where the coating is breached, the zinc corrodes in place of the steel, which is what makes it the right choice for a plating shop with bath vapour and rinse mist present continuously. This is the finish on the HD variant.

Hot-dip galvanizing is quoted at more than 500 hours of salt spray resistance and is the finish for outdoor storage yards and wet-process lines with direct water exposure. It is also the coating least damaged by mechanical handling, because it is thicker and metallurgically bonded.

Set the finish against the harshest station on the loop rather than the typical one. A single rinse bay in an otherwise dry run is where corrosion will appear, and the chain gets changed out for something that touches a small part of its total length.

The dimensional logic of the QXG series carries across this pitch even though the pitch itself changes. Pin diameter, the hanger plate interface and the way the wheels engage the I-beam flange all follow the conventions set by the smaller range, which is what lets a plant running both pitches keep one set of drawings and one maintenance procedure.

The exception is the pitch-dependent hardware, and it is the one that catches people out. A 250 mm chain needs a matching 250 mm drive sprocket, and the drive engagement geometry, the spacing and the minimum curve radii all differ from the 200 mm series. The track profile is conceptually similar - a single I-beam - but that is not the same as interchangeable.

The practical rule is not to mix pitches on one loop. Two chains of different pitch cannot be joined, and a drive sized for one pitch will not engage the other. Contact engineering for a track compatibility assessment before putting the two series on the same line, and include the existing sprocket and I-beam dimensions with the enquiry.

Within the pitch, the three variants are interchangeable at link level. Pitch and hanger spacing are common to S, HD and HA, so a line can be stepped up from standard to heavy-duty by replacing links, with the production interruption measured in hours rather than days.

The chain is the traction element of a single-rail loop. A caterpillar drive or a sprocket unit engages it at one station and pulls it round; the wheels carry the hanging load on the I-beam flange. Nothing is lifted or held by the drive; its single job is to beat the friction of the entire loop, which is why drive sizing follows total line tension rather than the weight of the parts on the hangers.

Horizontal guide wheels run on the lower flange and turn the drive's rotary input into steady linear travel. Hanger plates sit at the pitch or at multiples of it, following the 250+(250xN) formula, and the parts hang from those points.

At the far end of the circuit the chain passes round a return idler, comes back on the return track and closes the circle. A tensioning device holds working tension and absorbs the two changes a line throws at it over the years: the track and chain growing as oven sections heat and shrinking as they cool, and the slow stretch of the chain as pin and bushing surfaces wear.

The two kinds of bend ask different things of the chain. Round a horizontal curve the articulated joints let it follow the curved beam, with the minimum radius set by the variant - R750 on the standard model - while the vertical guide wheels hold lateral position on the flange. Where the line rises or falls, the two wheel sets divide the load between them through the gradient, and that combined loading is what the HA variant's tapered roller bearing is specified for.

The single-guide arrangement keeps the infrastructure to one I-beam, which is the cost advantage over a dual-rail line and the reason this range is often chosen where the load and length do not justify a second rail. The fixed hanger orientation is the same in both travel directions, so fixtures hold a predictable attitude wherever they are on the loop.

Powder coating and curing lines. The primary application. The pitch gives enough clearance for parts such as bicycle frames, motorcycle tanks and vehicle sub-assemblies travelling through multi-stage ovens that run between 200 and 280 °C. Because the hanger is part of the link, fixtures can be hooked directly, with no secondary bracket hardware inside the oven chamber to work loose under thermal cycling.

Plating and anodizing shops. Zinc, nickel and chrome plating, and hard-coat anodizing. The HD variant with zinc plating is the usual specification, because the chain works above open baths in constant vapour and repeated rinse moisture, and the sealed bearings keep electrolyte out of the rolling elements. The wider pitch also takes larger plating racks and barrel fixtures than the 200 mm range.

Large appliance and equipment building. Cabinet lines, commercial air-conditioning units, industrial washer drums and machine enclosures all sit above what a smaller pitch can carry at one point. The HA variant at 150 kg per suspension point matches that weight profile, and the fixed plate orientation simplifies fixture design at automated load and unload stations.

Overhead transport and logistics. Storage-and-retrieval loops, garment sorting, cold-chain meat processing, and heavy assembly where single-rail simplicity is preferred. Here the value is the flexible spacing: on a mixed-product loop, parts of different sizes share one track without colliding

A note on the last application. It is the one where a smaller pitch is often the better purchase, because the load per point rarely justifies the larger radius the 250 mm pitch needs at the curves. Where the deciding factor is part size rather than weight, check the curve radii against the building before committing to the pitch.

QXG250-S (Standard) is the starting point: 100 kg per point, 50 kN allowable, 6205 sealed ball bearings, R750 horizontal, up to 200 °C, E-coating. For a dry line carrying a moderate weight at each hanger, this is the variant.

QXG250-HD (Heavy-Duty) steps the load to 125 kg per point and the allowable tension to 65 kN, with 6206 bearings, R800 and a 240 °C rating, finished in E-coat over zinc plate. It is the variant for a line with rinse zones, or for one where the load has grown.

QXG250-HA (Extra Heavy) is the top of the range: 150 kg per point, 75 kN allowable, a tapered roller 30205 bearing, R900, 280 °C and hot-dip galvanizing, with the reinforced forged hanger. It is the one to specify where a heavy point load and a hot or wet environment arrive together.

Three selection points that decide it in practice. If the oven section runs above 240 °C, the choice is HA on temperature alone. If the line has rinse zones or is unheated in a wet climate, HD or HA on finish rather than on load. And if the building constrains the curve radius, check R750 against the layout before choosing a larger variant, because the radius grows with the variant as well as with the pitch.

Stepping up within the range is cheap. Pitch and hanger spacing are common to all three, so a line can move from standard to heavy-duty by replacing links, with the track, the drive and the process equipment untouched.

The numbers below are the ones to set against a competing offer. Each is taken from the original specification, and the conditions the source attaches to it travel with it.

Load. The HA variant carries 150 kg at each suspension point, against a breaking tensile strength of 130 kN. Against the 200 mm range's top figure of 120 kg per point, that is a 25% increase.

Maintenance. The bearings are sealed, so no scheduled lubrication. The quoted field interval is 12 to 18 months under standard conditions, which is an inspection interval rather than a promise of no maintenance.

Durability. Quoted at 10 to 15 years for continuous running in an automotive paint shop. The qualifier matters - that is a clean, temperature-controlled shop, which is the friendliest duty this chain sees.

Noise. Below 65 dB(A) at rated travel speed, with machined wheels on sealed rolling elements.

Energy. An 18 to 22% reduction in drive motor draw against unsealed or grease-lubricated alternatives, from lower rolling friction. Note the baseline: this figure compares against a different class of chain from the dual-rail saving quoted elsewhere in the QXG range, so the two are not interchangeable in a comparison.

Assembly. Each link joins to the next with ordinary hand tools, so chain length is adjusted on site without special equipment.

The energy figure is the one to treat with most care, because the comparison baseline is stated as unsealed or grease-lubricated chain rather than a specific product. It describes why a sealed wheel consumes less, not what a given line will save.

A single-rail line is more forgiving than a dual-rail one, because there is only one running surface to align - but the pitch makes the curve geometry less forgiving, so the checks below are worth doing in order.

Confirm the curve radii against the layout. Take the minimum horizontal and vertical radius for the variant you have chosen and check them against the building before anything is hung. The radius is the constraint that most often forces a change of variant after the fact.

Set the track level and true. Level and true are two separate checks. A beam that is level yet twisted will load the guide wheels unevenly from the first week, and it will not be visible until the wear is well advanced.

Fit the drive and the take-up, then thread the chain. The take-up needs travel in both directions, because the chain settles during its first weeks and the loop length also shifts with temperature.

Check hanger orientation at the load and unload stations. The fixed plate points the same way on every link, so the datum is known - which makes a mismatch at a station a layout error rather than a chain error, and easier to find at commissioning than during production.

Tension, run in, and record. Set tension to roughly the mid-point of the stroke available, and run the loop empty for a few circuits before hanging any load on it. Log the drive current at normal load and the take-up position; with those two numbers on file, a later shift can be read as wear or as a fault instead of being guessed at.

Spares are held for all three variants: link assemblies complete, wheels already carrying their bearings, pin-and-bushing sets, and hanger plates. Because the hanger is part of the link, a damaged hanger is replaced as a link rather than as a separate bracket, which keeps the number of distinct parts on a line low.

What to keep on site. On three-shift working, a spare link assembly or two together with a wheel unit and a pin-and-bushing set will cover the failures that actually stop the line. Anything beyond that belongs to planned replacement rather than to emergencies.

Dispatch. Stock items normally leave our Hangzhou works within seven to ten working days; a non-stock item is quoted against a manufacturing date instead of that figure.

Technical support. Wear, tracking and alignment questions are handled remotely, and commissioning support on site can be arranged where the installation is a first one or a conversion. If a line develops a problem afterwards, start from the handover record: drive current and take-up position read together say what has shifted.

Repeat orders. Your chain specification is kept on record, so ordering again does not mean going back to the drawing. That counts on a plant running more than one QXG variant, where the difference between S, HD and HA cannot be read off a worn link.

Most of what goes wrong on an overhead conveyor is decided before the chain is ordered, in the layout. That is why the engineering side of a QXG250 enquiry is a layout review rather than a specification confirmation.

What the review covers. Total loop tension against the allowable figure, the curve radii against the building, the hanger spacing against the process pitch the ovens and booths were built around, and the temperature profile against the variant and the bearing option. It is provided at no charge, and where the answer is that your duty does not need this pitch we will say so.

What we need from you. The loop drawing, the weight hanging at a single point, the peak temperature the line reaches, the running speed, the I-beam section already installed and, where a drive exists, its sprocket dimensions. A photograph of the present track and hanger resolves most of the rest.

Sampling. Evaluation chains are available so the hanger interface and the spacing can be tried on the line before a full set is committed. Allow around 30 working days for a trial length and 60 for a full order, counted from the deposit.

Documentation supplied. The technical data sheet and CAD dimensional drawings are issued on request with the quotation, so the fixture design can proceed in parallel with the chain order rather than after it.

Where the review happens. It is handled by the engineering department that quotes the order, not passed to a separate office, because the useful answers depend on the layout rather than on the catalogue.

A conveyor chain order is usually part of a larger project, so the paperwork matters as much as the packing. What follows is what travels with a QXG250 consignment.

Commercial documents. Invoice and packing list, with the chain identified by model and variant - QXG250-S, HD or HA - and by the number of links or metres, because a mixed consignment identified only by product name cannot be checked on arrival.

Certification. Material certification for the link and plate, and the inspection record for the batch, are issued with the order. Where the equipment is part of a line being commissioned to a regulated customer, ask for them when the enquiry is placed rather than once the goods are ready, since the paperwork is issued with the batch.

Marking. Bundles are marked with the order number, the variant and the position in the loop, so a consignment shipped in stages can be installed in stages without opening everything to find a part. Shipping marks follow the customer's instruction where one is given.

Container loading. Because the track is usually the heavier item on a project, the container tends to be planned around the track sections with the chain filling what remains. When the two ship together, we issue the loading plan and the forwarder works to it.

Photographs before dispatch. The packed goods are photographed before the container is closed, so a discrepancy is raised while it can still be corrected at this end.

Q1: Do you build the chain in your own factory?

A: The link, the hanger plate and the heat treatment are all done on our own site. The group's chain plant dates from 2003, and the engineering answers come from the people who make the product.

Q2: What are the three variants?

A: QXG250-S carries 100 kg per suspension point and 50 kN allowable tension, QXG250-HD carries 125 kg and 65 kN, and QXG250-HA carries 150 kg and 75 kN with a tapered roller bearing. Pitch and hanger spacing are the same on all three.

Q3: How does the fixed hanger differ from a removable bracket?

A: The hanger is forged as an extension of the link, so the load path never crosses a joint. A removable bracket is attached with fasteners or a weld, and that interface is what loosens, shifts or cracks under repeated thermal cycling.

Q4: What spacing does the chain give?

A: Hanger spacing is 250+(250xN), so points sit at 250 mm or multiples of it. The spacing your process needs is set by choosing N rather than by changing the chain.

Q5: Can the QXG250 run on existing QXG200 track?

A: Not as a direct substitution. The track profile is similar in concept, but a 250 mm pitch needs a matching 250 mm drive sprocket, and the drive engagement geometry, spacing and minimum curve radii all differ from the 200 mm series. Send the existing sprocket and I-beam dimensions and we will assess it.

Q6: What curve radius does the chain need?

A: R750 horizontal and R3200 vertical on S, R800 and R3600 on HD, R900 and R4000 on HA. The horizontal radius is the one to check against the building on a conversion, because it is larger than the equivalent figure on a 200 mm pitch.

Q7: Is greasing required?

A: The wheel bearings are sealed at build, so under normal conditions there is no routine greasing to do. The quoted inspection interval is 12 to 18 months, and on abrasive or wet duty treat that as the outside figure and check the seals earlier.

Q8: What temperature can it operate at?

A: Up to 200 °C on S, 240 °C on HD and 280 °C on HA, with a high-temperature bearing option where the section runs hot. A line with an oven above 240 °C will normally need HA on temperature alone.

Q9: How long will an order take?

A: A trial length takes roughly 30 working days and a full order roughly 60, both running from the deposit.

Q10: How quickly can spare parts be supplied?

A: Stock items normally dispatch within 7 to 10 working days from Hangzhou. A non-stock item is quoted against a manufacturing date rather than that figure.

Q11: What can be made to order?

A: Pitch, hanger geometry, attachment interfaces, bearing type, construction in 304 or 316 stainless, and finishes beyond the three grades listed above. Send a drawing, or failing that one link, and the drawing office will come back inside about two working days.

Q12: What surface treatments are offered?

A: Black epoxy electrophoretic coating as standard, quoted at over 200 hours salt spray; the same coating over zinc plating for humid stations; and hot-dip galvanizing quoted at over 500 hours for outdoor or wet-process duty.

Q13: What do you need from me to quote?

A: The loop drawing, the weight at one suspension point, the highest temperature, the running speed, the existing I-beam section and the drive sprocket dimensions if a drive is already installed.

Q14: Are replacement links and wheels available separately?

A: Yes. Each can be ordered on its own - link assemblies, wheels with their bearings, pin-and-bushing sets and hanger plates - so a single damaged item does not mean a whole new chain.

Send us the layout, the load and the track you have.
Send the loop drawing, the weight each suspension point carries, the hottest temperature on the line and the I-beam section already in place, and our engineers can confirm the variant and whether the pitch suits the building.

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