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Timing Belt Manufacturer Ultimate Guide (2026): Types, Grades and How to Choose

2026-09-17

A timing belt manufacturer earns a place on your approved list when it can hand over tooth geometry data, cord construction, pitch length tolerance and per-batch test records for the exact belt it quotes — not a catalogue photo and a price per piece. We are Ningbo Sinoconve Belt Co., Ltd., brand SINOCONVE, and we have been building belts in Ningbo, China since 1988. Our plant runs ten production lines, eight for fabric carcass and two for steel cord, with more than 200 employees serving over 1,500 industrial customers. The single most useful thing we can tell a buyer up front: on a synchronous drive, almost every premature failure we see is traceable to the selection sheet, not to the rubber.

This guide is written for the engineers who own that selection sheet — procurement teams at machine builders, maintenance planners in packaging and textile plants, and design engineers specifying an industrial synchronous belt into a new axis. We cover how a timing belt actually transmits torque, the difference between trapezoidal and curvilinear tooth forms, why pitch is the field people misread most often, how rubber and polyurethane compounds divide the world between them, a four-step sizing method, tensioning practice from the shop floor, what to demand from a supplier, and how to price the whole thing properly. Where we quote numbers, they are industry-typical and must be confirmed against the actual duty and the approved drawing. Nothing here replaces a real duty calculation; it should make that calculation faster and less expensive to get wrong.

Send Your Pulley Data and Get a Matched Timing Belt

Double sided timing belt from a timing belt manufacturer with teeth on both faces

Teeth on both faces: a double sided timing belt off one of our building lines.

01How a Timing Belt Works, and Where the V-Belt and Chain Boundary Sits

A timing belt is a belt with teeth moulded into one or both faces, and the pulley it runs on has matching grooves. Torque crosses the drive because the belt teeth sit inside those grooves and push on their flanks. There is no wedge friction involved, which is the whole point: the speed ratio is fixed by the tooth counts, and it stays fixed as the drive runs. If you have 24 teeth on the driver and 72 on the driven pulley, you get 3:1 whether the machine is cold, hot, lightly loaded or at full torque.

That is a different proposition from a V-belt, and the difference decides which one belongs on your machine. A V-belt is a friction drive. It relies on the belt wedging into the sheave groove, and it needs a certain amount of slip to work; typical slip figures in the industry run around 1–2% under normal load and climb quickly when the drive is overloaded or hot. That slip is often a feature, not a defect. It absorbs shock, it tolerates a little misalignment, and it will complain loudly before it destroys a gearbox. A synchronous belt has none of that forgiveness. Because it cannot slip, every shock load, every jam and every reversal lands on the belt cords, the pulley teeth, the shaft bearings and the frame. That is why a proper service factor matters more on a timing belt than on any friction drive.

As a transmission belt manufacturer we build both families, and we still watch customers move a drive from friction to synchronous for the wrong reason — usually because they want "less maintenance" and then discover they now need precise alignment and a shorter re-tension interval. The honest trade-off, as a V-belt manufacturer who also sells synchronous belts, looks like this:

Selection factor	Synchronous (timing) belt	V-belt	Roller chain
Speed ratio accuracy	Fixed by tooth count; no measurable slip on a correctly tensioned drive	About 1–2% slip typical, worse when overloaded or hot	Exact when new, then drifts as pins and rollers wear
Positioning repeatability	Roughly ±0.1 mm per 300 mm of span on a stiff, well-tensioned drive (typical)	Not a positioning drive	Good until backlash grows; then it never repeats
Noise at moderate speed	Around 60–75 dB(A) typical; curvilinear teeth are quieter than trapezoidal	65–80 dB(A), plus belt flap on long spans	80–95 dB(A) without an enclosure or a damped chain
Lubrication	None	None	Mandatory, plus oil mist and drip control around food areas
Routine maintenance	Re-tension after the first 24–48 h of running, then alignment checks	Tension or replace as a matched set	Lubricate, adjust, replace chain and sprockets together
Shock and jam behaviour	No relief valve: shock reaches shafts, bearings and the frame	Slip acts as a crude clutch and protects downstream parts	Tolerates shock well, but every jam wears the chain
Temperature ceiling	Roughly −30 °C to +100 °C for standard rubber compounds, higher for heat grades; PU is usually limited to about −20 °C to +80 °C (typical)	Similar to rubber belts, and it degrades faster when hot	Handles high temperatures provided lubrication survives
Dirt and contamination	Abrasive grit wedging in the grooves mills the teeth; some oils attack certain compounds	Fairly forgiving of dust and grit	Abrasive dust plus lost lubrication is the fastest way to destroy one
Cost picture	Mid purchase price, lowest running cost when the drive is designed correctly	Lowest purchase price, cheapest to replace badly	Low belt cost, highest installed cost once guarding and lubrication are added

Two field notes worth keeping. First, a synchronous belt is not automatically quieter than a chain; poorly meshed or over-tensioned belts whistle, and trapezoidal teeth at coarse pitch are noticeably noisier than a curvilinear profile at the same duty. Second, the belt is only part of the drive. Worn pulley grooves will destroy a new belt within weeks, which is why we ask for a pulley drawing and a groove wear measurement before we quote a replacement set. If you have not yet separated the two families in your own plant, the comparison in our timing belts vs V-belts breakdown is a useful half-hour of reading before you write a specification.

02Tooth Profiles and Pitches: What Every Designation Actually Means

Most timing belt arguments in a meeting room come down to two words people use interchangeably: profile and pitch. Profile is the shape of the tooth — trapezoidal, curvilinear, or a modified version of either. Pitch is the distance from the centre of one tooth to the centre of the next, measured along the pitch line, which is the neutral axis where the cords sit and where bending neither stretches nor compresses the belt. The pitch is what has to match the pulley. The profile is what decides how much torque that pitch can carry and how quietly it does it.

We run the full profile range — the pitch table below is the one we send out with quotations, and it is worth keeping next to your drawings. Everything an industrial conveyor belt catalogue does for bulk handling, this table does for positive drives.

Profile family	Common designations	Pitch	Where it fits	What to watch
Inch trapezoidal	MXL, XL, L, H, XH, XXH	2.032, 5.08, 9.525, 12.7, 22.225, 31.75 mm (0.08 in to 1.25 in)	Legacy American machinery, instruments, light conveyors, retrofit work	Generous tooth clearance means more backlash and more noise; long pitches need many teeth in mesh
Metric trapezoidal	T2.5, T5, T10, T20	2.5, 5, 10, 20 mm	General industrial drives, low to medium speed, European machine designs	Straight flanks load the tooth root harder than a rounded form at the same pitch
Modified trapezoidal	AT5, AT10, AT20	5, 10, 20 mm	Higher torque inside the same metric pitch envelope; positioning demands	Deeper tooth and a different flank angle — never assume a T pulley takes an AT belt, or the reverse
Curvilinear (HTD)	3M, 5M, 8M, 14M, 20M	3, 5, 8, 14, 20 mm	Pumps, compressors, fans, mixers, screw conveyors, machine tool drives	Rounded tooth spreads load along the flanks: quieter and generally stronger than trapezoidal at equal pitch
Modified curvilinear	GT2, GT3, GT (2M, 3M, 5M, 8M, 14M), RPP, RPP5, RPP8, RPP14	2, 3, 5, 8, 14 mm	CNC axes, robotics, servo positioning, printing registration, any drive where backlash hurts	Higher power rating per millimetre of width, but profile generations are not all interchangeable — match to the pulley on the drawing
Micro pitch, usually PU	T2, T2.5, 2M, 3M in polyurethane	2–3 mm	Compact actuators, small conveyors, automation grippers, light guides	Very low elongation, so centre distances must be tight and take-up travel small

Reading a belt marking without guessing

Marking on the belt	Pitch length	Pitch	Width
400-5M-15	400 mm, which is 80 teeth × 5 mm	5 mm HTD curvilinear	15 mm
100XL025	100 tenths of an inch = 10.0 in ≈ 254 mm	0.2 in (5.08 mm) trapezoidal	0.25 in ≈ 6.4 mm
880-8M-30	880 mm, 110 teeth × 8 mm	8 mm HTD curvilinear	30 mm
T10 780 40	780 mm, 78 teeth × 10 mm	10 mm metric trapezoidal	40 mm
500-AT10-25	500 mm, 50 teeth × 10 mm	10 mm modified trapezoidal	25 mm

Standards help you compare suppliers, but they do not do the engineering for you. Inch-profile belts are normally referenced to ISO 5296, curvilinear metric profiles to ISO 13050, and the T and AT families to DIN 7721; Japanese machine builders often work to JIS K6372, and North American distributors frequently quote RMA practice instead. The pitch values agree across those documents. The tolerances, the measuring fixtures and the rated power tables behind them do not always agree, which is why you should confirm a cross-standard substitution against the actual duty and the approved drawing rather than against a catalogue note. If a supplier tells you two profiles at the same pitch are "the same belt", ask them for the rated power per millimetre of width for both, at your speed and your smaller pulley. The numbers will usually end that conversation.

The full size list, moulded widths and available tooth counts for each family are on our timing belt range page, and if you are converting an older inch-profile drive, the rubber timing belt pages list the tooth-count steps we hold tooling for.

03Rubber Timing Belts, PU Timing Belts and Double Sided Designs

Once the profile and pitch are settled, the material question decides how long the belt lives and where it may legally run. A conveyor belt manufacturer with real compound control — a genuine conveyor belt factory rather than a trading desk — will tell you that the same tooth geometry in three different materials behaves like three different products. The same discipline applies whether the product is a timing belt or a rubber conveyor belt for bulk handling. We build timing belts in rubber, in polyurethane and in double-sided configurations, and the choice is usually made by temperature, oil exposure and cleanliness, in that order.

Rubber compound families

Standard timing belts are built from polychloroprene (CR, still called neoprene on most drawings). It is the workhorse: good flex fatigue resistance, reasonable oil and ozone resistance, and a wide service window that typically spans about −30 °C to +100 °C. For hotter drives — a press, a kiln-adjacent fan, an engine bay — we move to HNBR, which pushes the ceiling to roughly +120 °C or a little beyond on a well-designed drive and holds oil resistance better. EPDM is the choice where steam, hot water or strong ozone is present, and it is the compound we reach for on outdoor drives in tropical installations; it is poor in oil, so it must not be specified near a gearbox breather. Where static conductivity matters, we build compounds with a controlled surface resistance rather than adding a conductive coating later, because coatings wear off exactly where the belt flexes.

Polyurethane and what it buys you

Polyurethane timing belts are usually cast or thermoplastic, with the teeth moulded to a much tighter dimensional band than a rubber belt, and the tooth side often faced with a nylon fabric to cut friction and noise. The gains are real: higher abrasion resistance, excellent resistance to oils and greases, far lower elongation, and better dimensional stability over the life of the belt. Cast PU also machines and welds, which is why it shows up on endless or joined belts and on wide belts where you want the back side open for a slider bed or a vacuum box. On our own PU timing belt line, the majority of orders are for positioning axes where backlash and stretch are the enemy.

Double sided timing belts

A double sided timing belt carries teeth on both faces. Designers use them for three reasons: to drive two output pulleys from one belt where the second must rotate the other way, to reverse direction around an idler without losing synchronisation, and to package a serpentine drive into a short centre distance. The two faces can be the same profile or different ones — an 8M pitch on the drive side and a 5M on the back, for instance — and they can be the same material or a rubber body with a PU back. Two practical warnings. First, a double-sided belt has a defined minimum pulley diameter on both faces, and it is usually larger on the back side; ignore that and you crack the backing. Second, when both faces are loaded, the cord line sits between two sets of teeth, so you must tell your supplier the torque split. Hiding half the duty in the hope of a lower price is how a drive ends up with a shortened life nobody can explain.

The cord line does more work than the compound

The tensile cords carry the load, and they are chosen almost independently of the covering material. Glass fibre is the default: low stretch, good dimensional stability, moderate cost, and it behaves well over normal pulley diameters. Aramid is stronger and stiffer, which suits high-torque or shock-loaded drives, but it tolerates fewer flex cycles on very small pulleys. Steel cord gives the highest tensile capacity and holds length precisely over long spans, which makes it popular on long, fixed-centre drives and on automotive camshaft applications. All three are available, and the right answer depends on your pulley diameters and whether the drive has take-up adjustment. A generally useful rule, always to be confirmed with the belt supplier: the stiffer the cord, the more careful you have to be about small pulleys and misalignment, because a stiff cord converts misalignment directly into edge stress.

Property	Rubber (CR) belt	HNBR / EPDM rubber	Polyurethane belt
Typical temperature window	About −30 °C to +100 °C	HNBR to about +120 °C; EPDM strong on heat, steam and ozone	About −20 °C to +80 °C for standard grades
Oil and grease	Moderate; swells slowly with continuous contact	HNBR good; EPDM poor	Good to excellent
Abrasion resistance	Adequate for clean drives	Adequate; heat grades are not wear grades	High, particularly cast PU with a fabric facing
Dimensional stability and stretch	Noticeable run-in elongation; re-tension expected	Similar, and length control is largely set by the cord	Very low elongation, tight tooth tolerance
Cleanliness and food contact	Rubber dust possible on dry drives; white food-grade compounds available	Similar, with compound choice driving the approval	Best for washdown, cleanroom and food lines; easy to wipe down
Shock behaviour	Tolerant, with useful compliance on the tooth flank	Tolerant, and more temperature-stable	Less forgiving; sharp jams can chip teeth
	General industrial drives, conveyors, textile machinery, pumps		Positioning axes, packaging, small actuators, food and medical equipment

All figures above are typical ranges, not guarantees. Confirm them against the actual duty, and remember that a rubber belt and a PU belt of the same profile rarely interchange without checking pulley diameters, tensioning method and take-up travel. Automotive duty is a separate conversation again — the automotive timing belt range uses HTD-style and special profiles with heat and oil packages that we would not put on a general industrial drive, and our ribbed belt line covers the multi-rib accessory drives where a plain timing belt is the wrong tool. Sometimes the answer is neither: on high-speed, low-torque duties, a ribbed or flat belt still wins.

Sourcing runs through the same channels as our bulk business. Buyers who normally issue a conveyor belt supplier enquiry for heavy belting will find the timing belt range on the same product list, and the commercial terms for wholesale conveyor belts and for power transmission belts are negotiated the same way, by volume, material and delivery window. If you buy through a conveyor belt distributor today, ask them for the cord type and profile generation in writing; that one question separates a stockist who can read a catalogue from a partner who can solve a drive.

04The Four-Step Selection Method We Use on Every Enquiry

There is no magic in drive selection, but there is an order of operations, and getting it wrong is how machines end up with belts that run hot, whistle, or fail at month four. Here is the sequence our engineers follow. It works for a 0.2 kW indexing axis and for a 150 kW compressor drive; only the numbers change.

Step 1: establish the design power and the design torque

Start with the real load, not the motor nameplate. Take the driven machine's absorbed power, then apply a service factor for starting conditions and shock. A centrifugal fan or a smooth-running conveyor typically needs something in the region of 1.3–1.6; a piston compressor, a crusher or a drive with frequent starts and reversals can demand 1.8 or more, and genuinely brutal duties go higher. Multiply to get design power. Then convert it to torque at the small pulley speed, using torque in newton-metres equal to 9550 times power in kilowatts divided by speed in revolutions per minute. For linear axes, convert force times velocity into the same currency. Write both numbers down. If you cannot state the design torque, you are not ready to select a belt, and any supplier who quotes without asking for it is guessing.

Step 2: choose the tooth profile and pitch

Two variables decide the profile and pitch: how much torque you must transmit, and how fast the small pulley turns. Coarse pitches carry more torque per unit of width because the teeth are bigger and there are more cord strands engaged, which is why 14M, AT10, T10 and H show up on heavy, slow drives. Fine pitches run more smoothly at speed, mesh with fewer teeth in a short arc and give better positional resolution, which is why 3M, 5M, GT2 and T2.5 dominate servo-driven axes. As a first cut, a 3M or GT2 belt suits small instrumentation and light axes, 5M and 8M cover the broad middle of industrial drives, and 14M or T20 appears above roughly 30–40 kW at low speed. Those brackets are typical starting points; the rated power tables at your actual speed and pulley size are what you must use. Match the profile generation to the pulleys you already own — a GT belt on an HTD pulley will run, but it will not deliver its rated capacity, and on a positioning axis it will show up as backlash you cannot tune away.

Step 3: fix the belt width

Width is the cheapest lever you have, and it is the one buyers squeeze hardest to save money. Rated power per millimetre of width comes from the manufacturer's table for the specific profile, pitch, pulley tooth count and speed. Divide your design power by that figure, then apply the tooth-in-mesh correction. The rule of thumb is that you want at least six teeth engaged on the small pulley for the full rating to apply; below six, the belt must be de-rated, and two or three teeth in mesh is a design that will ratchet under load sooner or later. If the width that falls out is awkward — say 17 mm when your catalogue jumps from 15 mm to 20 mm — take the wider one. A belt that is 10% wider than strictly necessary costs a few percent more and buys you tolerance for belt wear, groove wear and a slightly optimistic service factor. An undersized belt fails at the tooth root, and it fails on the busiest day of the year.

Step 4: set pulley teeth, centre distance and take-up

Now close the geometry. Small pulley tooth count has a floor set by flex fatigue: each revolution bends the cord over the pulley, and too few teeth mean too few cords survive the cycle count. Typical minimums in the industry sit around 14–18 teeth for 5M, 22–26 for 8M and 28–34 for 14M, with inch profiles following similar logic; treat those as starting points and confirm against the supplier's data for the cord you have chosen. Bigger pulleys are kinder to the belt, which is why we often ask a designer to gain one tooth on the small pulley rather than buy a heavier pitch. Then set the centre distance. Longer spans mean fewer flex cycles per hour per tooth, but they also mean more belt length that must be tensioned and more opportunity for misalignment. Practically, we look for a centre distance that gives between six and twelve teeth in mesh, allows the belt length to land on a standard tooth count, and leaves 1–2 teeth of adjustment travel in the motor mount for re-tensioning. If take-up is impossible, you are designing a fixed-centre drive, and then the cord choice and the belt length tolerance tighten considerably.

The consequences of skipping a step are predictable. Undersized width shows up as sheared teeth or as a belt that skips a tooth under peak load. Too coarse a pitch on a small pulley shows up as cords breaking in a belt whose teeth still look new. Too few teeth in mesh shows up as ratcheting that nobody can explain with a tension gauge. And a fixed-centre drive with a standard-stretch cord shows up as a drive that howls when the shop warms up in summer, because the belt got longer and the tension went away. None of these are belt defects. All of them are selection errors, and all of them are cheaper to fix on paper than in a machine.

05Tensioning, Alignment and Installation on the Floor

On a synchronous drive, installation quality decides belt life more than belt quality does. A correct belt, fitted badly, will fail before a mediocre belt fitted properly. This is the part of the job where we spend most of our technical support time, so here is what we actually say to maintenance teams.

Set the initial tension by measurement, not by feel. The traditional field method is the deflection test: apply a known force at the midpoint of the longest free span and measure how far the belt deflects. The common target is deflection of about 1/64 of the span length — roughly 4 mm on a 250 mm span — under a force taken from the belt manufacturer's table for that profile and width. The better method, when the drive matters, is a sonic tension meter: pluck the span, read the frequency, and set tension from the belt mass per unit length. Frequency is repeatable, it can be logged, and it removes the argument about whose thumb is stronger. Either way, record the reading and the date on the machine. A maintenance record that says "tensioned correctly" is worthless six months later; a frequency number plus the ambient temperature is a diagnostic tool.

Expect to re-tension. A new rubber belt elongates during its first hours of running, typically by a few tenths of a percent up to about 1% depending on cord and load, and most of that relaxes in the first 24–48 hours. Plan that re-tension into the commissioning schedule instead of treating it as a fault. On a fixed-centre drive you cannot re-tension, so the cord choice must be low-stretch and the centre distance must be computed for the belt at its relaxed length, not its new length.

Never pry, roll or stretch a belt onto a pulley. Every cord damaged during installation becomes a broken belt with no visible cause. Loosen the motor mount or the take-up, slide the belt into the grooves, then bring the centre distance back. If the belt does not go on with modest hand pressure, the length is wrong — go back and count teeth rather than forcing it.

Alignment is where most noise and edge wear come from. Check the two shafts are parallel and the pulley faces coplanar before tensioning anything. As a working target, aim for angular misalignment under about 0.5° and parallel offset under roughly 0.25 mm per 100 mm of pulley face width, then verify with a straight edge across the pulley faces or, better, a laser alignment tool. When a belt runs against a flange on one side, the instinct is to blame the belt; in our experience the cause is a shaft that is out of parallel, a pulley that is not seated on its taper, or two pulleys of different wear. Fix the alignment, not the belt.

Put idlers in the right place. A tensioning idler belongs on the slack side of the drive and as close to the large pulley as the layout allows, because that is where it changes belt tension with the least effect on the arc of contact. On the tooth side of the belt you must use a toothed idler of the matching profile and pitch. On the back side you may use a flat idler, but it must be at least as large as the recommended minimum back-bend diameter for the profile, or you will crack the backing. Never put an idler on the tight side to "help" a drive; you will reduce the teeth in mesh and shorten the belt's life.

Check the pulleys before you blame the belt. Groove wear, a burr on the flange, a worn bore or a bent shaft will all destroy a new belt within weeks. Measure the groove width at the pitch line with a pin gauge, look for a step or polish pattern on the tooth flanks, and check runout with a dial indicator if the drive has a history of belt failures. A surprising share of repeat failures on otherwise identical machines trace back to a single damaged pulley that keeps being fed fresh belts. Our technical service pages cover the field checks in more detail if your maintenance team wants a printed procedure to work from.

06What a Qualified Timing Belt Manufacturer Must Put in Writing

Buying a synchronous belt is not like buying a length of flat belting. You are buying a dimensionally critical part, and the paperwork matters as much as the part. This is the minimum we would expect from any supplier, and the standard we hold ourselves to.

Curing and winding area where a timing belt manufacturer builds the belt

Winding and curing: where cord tension and tooth form are locked in.

Dimensions and tooth form

Pitch length tolerance, measured on a proper two-pulley fixture at a defined measuring force — not with a tape on a bench. Tooth profile dimensions against the standard the drawing references, whether that is ISO 5296, ISO 13050 or DIN 7721. Backing thickness and width tolerance, stated as a band rather than a single nominal. If a supplier cannot tell you what fixture and what force they measure pitch length with, the number they quote is decoration.

Cord specification and elongation

Cord material, cord count per pitch, cord treatment and adhesion to the compound. Then the number that actually predicts whether your fixed-centre drive will work: elongation at reference load, plus the expected running elongation after 48 hours. Glass, aramid and steel cords sit in clearly different bands, and a supplier who quotes only "high strength cord" is hiding the one figure you need.

Batch consistency and release documents

Compound batch records, mould or sleeve identification, and a batch number marked on the belt so a field failure can be traced back to a production date. Then dimensional and mechanical test results per batch: tooth shear, cord adhesion, hardness, pitch length. These are the same records our own quality assurance process releases against, and they sit behind the traceability and inspection records we hand to OEM customers. If your tender needs third-party inspection or a compliance file, ask before the order, not after; the certificate and compliance question is one of the most common things buyers get wrong in the RFQ stage.

07Troubleshooting: Five Failures and What They Mean

Diagnosis starts with the failure mode, because each mode points at a different root cause. The pattern below covers the vast majority of the timing belt returns and field complaints we handle.

Guarded machine drive, a typical duty for a timing belt manufacturer product

A guarded production drive, the everyday duty our belts are built for.

Symptom	Most likely causes	First check	Corrective action
Teeth skip or the drive ratchets under load	Low tension, fewer than six teeth in mesh, wrong profile, worn pulley grooves, a jam that pulled the tension out	Frequency or deflection reading on the slack span; count teeth in mesh on the small pulley	Re-tension to specification; add an idler to raise arc of contact; replace worn pulleys
Tooth sheared off or tooth flanks worn flat	Belt width undersized for the design torque, oil or grit in the grooves, misalignment loading one edge	Rating calculation against measured design torque; oil residue and grit in the grooves	Move up one width step, or to a coarser pitch; stop the oil leak; re-align the drive
Cords broken while the teeth still look new	Pulley too small for the profile and cord, back-side idler below minimum diameter, low ambient temperature	Pulley tooth count against the minimum; diameter of every back-side idler	Increase pulley size, change cord type, or switch to a more flex-tolerant construction
Belt runs hot, smells of rubber, hardens and cracks	Over-tension, ambient or radiant heat above the compound limit, chemical attack, ozone from nearby motors	Infrared temperature of the belt back after one hour; compare with the compound rating	Reduce tension to specification; move to HNBR, EPDM or a heat-tolerant PU grade
Whistling or a rhythmic slap; belt tracks against one flange	Over-tension, angular or parallel misalignment, mismatched profile generation, a flange burr or a bent shaft	Laser or straight-edge alignment across the pulley faces; runout on both shafts	Re-align, correct tension, dress or replace the flange, verify the pulleys match the belt profile

08Buying Practice: MOQ, Lead Time, Price Drivers, OEM Marking and Storage

Minimum order quantity. Around 50 metres per size is our normal starting point for a production run, and it can be lower for a sample evaluation. Low-volume buyers who only need a handful of belts are usually better served through a stockist than through direct factory production; the economics are different and pretending otherwise wastes everyone's time. If you are comparing a low-MOQ offer with a mass-production offer, it is worth reading how low-MOQ and volume production differ before you choose.

Lead time. Around 30 days is normal for a standard profile in a size we tool, and 15–20 days is achievable on an urgent run if the schedule allows. Samples typically ship in 2–5 days. What drives the number is tooling, not labour: a non-standard width or a new pitch means a mould or sleeve to build, and that is a different conversation from a belt off an existing sleeve.

What moves the price. Pitch and profile, because coarse pitches consume more material; belt width, which scales almost linearly; cord type, with aramid and steel adding cost over glass; compound, with HNBR and specialty food or antistatic grades above standard CR; tolerance class, because tight pitch length control slows the line; and extent of customisation, including double-sided construction, backings, and moulded or printed branding. Volume, packaging and marking requirements all move the final number. The cheapest belt in a quotation is rarely the cheapest belt in the plant.

OEM and private label. We support OEM and ODM work as standard: custom tooth profiles, widths, backings and colours, printed or moulded branding, private-label packaging and barcoded cartons. For distributors building their own brand, the workflow is documented in our private label programme; equipment builders who want a drawing-level specification and an approved sample first usually start with the OEM timing belt route.

Payment, packing and storage. Standard terms are 30% deposit by T/T with the balance before shipment, or an L/C; the details are set out in the payment terms FAQ. Belts ship coiled, never kinked, inside cartons with the size and batch marked, and our packaging guidance covers the details. Storage matters more than most plants assume: keep rubber belts out of direct sunlight, away from electric motors and other ozone sources, at roughly 15–25 °C and below 70% relative humidity, and rotate stock so the oldest belts go out first. Rubber products age on the shelf, so plan for a shelf life measured in years rather than decades; the principles are the same ones in our belt storage guidance. Polyurethane belts tolerate storage better than rubber, but they still dislike heat and sharp bends.

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09Frequently Asked Questions

Is a timing belt the same as a synchronous belt?

Yes. Timing belt, synchronous belt and toothed belt describe the same product, and the industry uses the terms interchangeably depending on country and end market. "Timing belt" dominates in automotive and machinery maintenance, while "synchronous belt" dominates in drive design documents. What matters is that the pitch, the profile and the width are specified, because those three fields define the part.

How do I identify the belt I need without a part number?

Measure three things: the pitch (centre-to-centre distance between two adjacent teeth), the width, and the number of teeth. Multiply pitch by tooth count to get pitch length. Then match the tooth shape visually against a profile gauge or a photo of the trapezoidal and curvilinear forms. If the belt is a legacy inch profile, look for a moulded marking on the back; most belts carry one, and it is usually more reliable than measurement with a tape.

Can a PU timing belt replace a rubber timing belt?

Sometimes, but never blindly. PU brings lower stretch, tighter tolerances and better oil resistance; it also brings a lower temperature ceiling and less shock tolerance. On a positioning axis in a clean area, PU is usually the better answer. On a hot, shock-loaded drive, rubber is. Check the pulley diameters, the tensioning method and the take-up travel before you switch materials, and confirm the change against the actual duty.

Why does my timing belt keep jumping teeth even though the tension is correct?

Then the problem is usually geometry, not tension. Count the teeth in mesh on the small pulley; below six, the belt cannot deliver its rated torque and will ratchet under peak load. After that, check whether the belt width is adequate for the measured torque, whether the grooves are worn enough to let the teeth sit deeper than intended, and whether a jam or a sudden overload is pulling the tension out of the drive. A worn pulley is the most commonly missed cause.

What is your MOQ, lead time and payment term?

Around 50 metres per size for a production run, about 30 days for standard profiles and 15–20 days on an urgent run, with samples in 2–5 days. Payment is normally 30% by T/T with the balance before shipment, or an L/C. Terms move with material, tolerance class and marking requirements, so send the duty data and the drawing and we will quote against them.

Can you make custom widths, tooth profiles and branding?

Yes. We build custom profiles, widths, backings and colours, and we mark belts with printed or moulded branding for private-label programmes. Non-standard sizes normally need tooling, which is where the lead time goes, so bring the dimensions early. Samples are the usual next step: approval on a sample is far cheaper than discovering a dimensional mismatch in a container.