Direct answer: Wear patterns are diagnostic. One worn edge points to misalignment; tooth-tip wear on every tooth points to over-tension or a worn pulley; cord lines showing through point to small pulleys or cord fatigue; and separation near the joint on a welded belt points to weld quality or excessive back bending.Reading the tooth face tells you where the drive, not the belt, is failing (25-H-87...

Direct answer: Keep belts coiled loosely in their original packaging, in a cool, dry, dark room, typically about 10 to 30 degrees C and moderate humidity. Under these conditions PU timing belts normally keep for several years in storage, and two to three years is a commonly quoted figure, before installation rather than calendar time becomes the main concern.PU belts keep best coiled in their orig...

Direct answer: The main families are all covered: HTD curvilinear in 3M, 5M, 8M and 14M; STPD in S2M, S3M, S5M and S8M; metric trapezoidal T2.5, T5, T10 and T20; AT5, AT10 and AT20; and imperial MXL, XL, L and H. Double-sided belts are available in most of these pitches.Imperial XL belt, one of the most common replacement pitches (196XL).Profile families at a glanceFamilyCommon codesTypical useHTD...

Direct answer: Almost any production size is possible. Endless moulded rubber timing belts typically range from about 100 mm to roughly 4,000 mm pitch length depending on the profile, and longer lengths can be made from open-ended material joined by vulcanizing. Widths typically run from about 10 mm to 200 mm and beyond, limited mainly by the tooling available for each pitch.An 8M belt moulded to ...

Direct answer: A timing belt is replaced by condition, not by calendar. In a clean, aligned, correctly tensioned drive, rubber timing belts commonly give many thousands of hours of service, but heat, oil, dust and misalignment can shorten that dramatically. Inspect at fixed intervals and replace at the first clear wear signs, rather than waiting for a failure.A correctly tensioned belt wears slowl...

Direct answer: 800-8M-30 means 800 mm pitch length, 8M tooth profile on an 8 mm pitch, and 30 mm width. Metric codes read length first, then profile, then width; imperial codes put the profile letter after the length in inches and the width in hundredths of an inch.The same data in a different order: 8M-2320-35 is an 8M belt, 2320 mm pitch length, 35 mm wide.Decoding metric and imperial codesCodeP...

Direct answer: A vulcanized belt can usually be repaired when the damage is local: cut out the affected section, prepare new steps and re-splice it, or patch the cover and the edges. Repair stops making sense when the carcass is exposed over a long length, the belt has stretched beyond its take-up, or the same point keeps failing.Open-end belt prepared for splicing. A repair splice uses the same p...

Direct answer: Match the cover to the product and to the temperature. Natural rubber covers give the best general grip and abrasion resistance, PVC covers suit oily, wet or sticky products that have to release, and silicone covers are used where heat or tackiness rules out rubber.PVC cover bonded to the carrying surface: low friction and easy release (600L-35+3PVC).Cover options at a glanceCoverTy...

Direct answer: Most failures of this kind are chemical or thermal rather than random. Hot moisture causes hydrolysis cracks, incompatible oils and solvents cause swelling and softening, and sustained heat from over-tension or misalignment hardens the belt until it cracks at the tooth roots.PU belts run clean and resist abrasion well, but the wrong chemical environment still attacks them (120XL-25)...

Direct answer: Yes. PU timing belts can be supplied with welded or moulded cleats, ground or perforated back surfaces, tracking guides and side walls, and bonded covers such as natural rubber, silicone or PVC, all made to your drawing.PU timing belt with cleats fixed to the back surface to a customer drawing (13.7AT10-4200).What can be added to a PU timing beltCleats and flightsCross cleats in PU ...

Short answer: Warranty terms are written into the quotation for each order. Custom belts are typically covered against manufacturing defects, such as compound faults or dimensions outside the approved drawing, when they have been stored, installed and operated within the agreed conditions. Wear from misalignment, wrong tension or overload is not covered, and we explain that boundary before you ord...

Short answer: Pitch and tooth profile, belt length or tooth count, width, material and cord preference, quantity and working conditions. With a drawing or an old sample you can send even less, because we measure the rest. The more complete your enquiry, the fewer clarification rounds before you have a firm price.The core specificationPitch and profileFor example HTD 8M or AT10, or an imperial pitc...

Short answer: Choose a timing belt when you want quiet running, no lubrication and low maintenance at normal industrial loads and speeds. Choose a chain when torque is very high, ambient heat exceeds what rubber compounds tolerate, or the environment is heavily abrasive. Both transmit positive power; the right choice comes down to load, environment and maintenance budget.Where a timing belt is the...

Short answer: For two equal pulleys, belt length is about 2C + 3.14 x D, where C is the center distance and D is the pitch diameter. For unequal pulleys, use L = 2C + 1.57(D1 + D2) + (D2 - D1)^2 / 4C. Then round the result to the nearest available whole-tooth length, because timing belts are made in pitch multiples.The formulasDriveFormulaUse it whenTwo equal pulleysL = 2C + 3.14 x DMirrored drive...

Short answer: Lay the belt flat on a bench, measure the outside circumference along the belt centerline with a flexible tape, then measure the width and the thickness at three points each. Note the splice angle and the running direction, add a few photos, and those numbers are usually enough for us to quote and make an exact replacement.The four measurements that matterOutside lengthMeasure the ou...

Short answer: Early joint failures usually trace back to four causes rather than to the belt material: contaminated or badly cut splice steps, cure temperature, pressure or time outside the compound schedule, tensioning the belt before the joint has fully cooled, and running the joint over a small pulley or at the highest load point in the drive. Most of these are process errors, and each one can ...

Short answer: There is no single minimum diameter, because the limit is set by the cord, the belt thickness and the pitch rather than by PU itself. Belt makers normally state it as a minimum number of teeth on the small pulley. As a working starting point, keep at least six teeth in mesh, and avoid small pulleys below roughly 15 to 20 teeth on standard steel-corded PU belts; aramid and high-flex c...

Short answer: Most PU timing belts are made between 80A and 95A Shore A, and 85A to 92A covers the majority of industrial drives. Practical tolerance windows are around plus or minus 0.5 mm on width and thickness for common sizes, and roughly plus or minus 0.3 to 0.5 percent on pitch length. Tighter figures are possible, but only after the actual construction is fixed, because cord type, belt thic...

Short answer: T/T bank transfer is our standard payment method, commonly a deposit with the balance before shipment; PayPal is accepted for samples and small orders, and a letter of credit can be discussed for larger contracts. We ship under EXW, FOB or CIF depending on your preference, and pre-shipment inspection by a third party such as SGS or BV can be arranged. The exact terms are written into...

Short answer: Yes. For custom timing belts we can issue material declarations for the compounds, cords and fabrics actually used in your order, and we can arrange third-party testing such as SGS on request. What we will not do is describe those documents as a certificate for a standard we have not had the finished belt tested against. Tell us the regulation your market requires, and we will confir...

Short answer: yes — field vulcanizing is standard practice when a belt is too long, too heavy or too installed to ship as a closed loop. You need a portable vulcanizing press sized for the belt width, the matching bonding materials, controlled temperature, pressure and time for the compound, and skilled personnel. For lighter belts where a press is impractical, a properly prepared cold-bonded spl...

Short answer: standard CR-based vulcanized belts are typically used in a continuous range from about minus 20 to plus 80 degrees Celsius. Heat-resistant rubber grades extend continuous service to roughly 100 to 120 degrees Celsius in industry-general terms, and low-temperature compounds can serve down toward minus 40 degrees Celsius. The exact window depends on the compound, cord and joint, so te...

Short answer: yes — thermoplastic PU timing belts are naturally more oil-tolerant and considerably more abrasion-resistant than most rubber constructions, which is why they dominate in oily, dusty and dry-running conveying and linear drives. Antistatic versions are also standard practice where static build-up matters. The exact behavior depends on the PU grade, cord and any cover, so specify the ...

Short answer: PU timing belts usually drift or mistrack because of pulley misalignment (shafts not parallel or not square to the belt path), incorrect or unstable tension, worn or damaged pulley teeth and flanges, debris in the drive, or a poorly made weld on an endless joined belt. Fix it in that order: check alignment first, then tension, then pulley condition, then cleanliness — and only then ...

Short answer: a custom timing belt can be built in rubber (CR, HNBR, EPDM) or thermoplastic PU, with tension cords in fiberglass, aramid or steel, and optional covering fabrics on teeth or back for special friction, wear or noise needs. The practical rule: match the compound to temperature, oil and environment; match the cord to load, shock and precision; add a cover only when the application dem...

Short answer: yes — a worn sample is often the fastest way to order a replacement timing belt. Send the old belt (even broken or heavily worn) and we measure pitch length, tooth profile, pitch, width, cord visibility and compound to build a dimensioned drawing for your approval before production. Clear photos with a ruler can be enough for a first feasibility check and quote, but a physical sampl...

Short answer: use idlers when you need more teeth on the small pulley, need to control belt slack-side behavior, or cannot reach the desired center distance. Put inside idlers on the slack side touching the back or the teeth, and outside (back-side) idlers on the slack side too — as a rule, avoid placing any idler on the tight side, because pressing the tight side raises tension and shortens belt...

Short answer: select a timing belt in this order: (1) service factor from your machine type, (2) design power = motor power × service factor, (3) pick a tooth profile and pitch so the belt's power rating covers design power at your RPM, (4) choose pulley sizes that respect minimum teeth and a sane center distance, (5) size the width from the per-unit-width rating. A quick sanity check: small pull...

Short answer: a properly vulcanized joint, made with correct surface preparation, adhesive and press temperature and time, typically recovers most of the base belt's tensile strength — commonly quoted in the range of about 70–90% depending on compound, joint design and workmanship, versus roughly 30–50% for a basic mechanical fastener connection. The exact figure depends on the belt type and the ...

Short answer: vulcanized flat belts and transmission belts can be made to almost any required length — as a truly endless loop produced in custom lengths, or as open-end strip that is joined (vulcanized) into a loop of the exact size you need. Standard production covers a wide range of widths and pitch lengths, and non-standard lengths are routine for a manufacturer with in-house vulcanizing equi...

Short answer: yes — as an independent manufacturer GOODLY routinely works under customer NDAs and treats drawings, samples and application data as confidential. Your specifications are used only to quote and produce your order, are not shared with third parties, and are not used to supply other customers. If your company has its own NDA template, send it over and we will review and sign before an...

Short answer: set timing belt tension so the belt neither ratchets (jumps teeth) under peak load nor exceeds the cord's safe stretch limit. In practice this means following the manufacturer's tension-force table for your belt width and span — measured with a frequency meter or spring-scale deflection method, not by feel. A common starting point for many industrial synchronous drives is a deflecti...

Short answer: seamless (truly endless) PU timing belts are extruded with no joint and offer the most uniform running and best fatigue life — the usual choice for high-speed or precision drives. Welded belts are made from open-end PU strip whose steel or aramid cords are joined with a connector or thermally welded loop; they are quicker to obtain in long or non-standard lengths and convenient for ...

Short answer: yes — PU (thermoplastic polyurethane) timing belts are widely used in food handling, packaging and pharmaceutical machinery because they are abrasion-resistant, oil-resistant, non-sticky and easy to keep clean. Important limits apply: for direct contact with food you need belts made with materials suitable for that contact (for example a food-grade cover or a declared food-contact T...

Short answer: custom timing belts are typically produced in about 1–3 weeks depending on complexity, mold availability and quantity, and sea freight from China to the USA or Mexico usually takes roughly 3–6 weeks door-to-door while air freight takes about 5–10 days. For standard-section custom-cut belts without new tooling, total lead time from drawing approval to delivery is commonly in the 4–8 ...

Short answer: recurring belt failures almost always trace back to one of five root causes: under-sizing the belt for the real torque, incorrect tension (too loose causes tooth jumping, too tight cord fatigue), misalignment, small pulley diameters below the profile limit, or harsh environment (heat, oil, debris). Replacing the belt without fixing the cause guarantees the next failure — diagnose th...

Short answer: hot vulcanizing gives the strongest, smoothest and longest-lasting joint but needs a press, power and skilled labor; cold bonding uses adhesive and cures at room temperature — faster and tool-light, but generally weaker than a hot splice; mechanical fasteners are the fastest emergency fix with the lowest joint strength. For permanent installations choose hot vulcanizing; use cold bo...

Short answer: a vulcanized joint is made by cutting and preparing the two belt ends, applying the matching rubber or PU compound, then bonding them under controlled heat and pressure so the joint cures into a continuous belt body. A properly made hot-vulcanized splice typically recovers a high share of the base belt's tensile strength — commonly cited in the region of 70–90% depending on construc...

Short answer: choose steel cord when you need maximum rigidity, minimal elongation and precise positioning (linear drives, robotics, long spans). Choose aramid (Kevlar-type) cord when the drive sees shock loads, frequent starts, small pulleys, or humid and corrosive conditions. Both run inside the same PU body — the cord decides stretch, flexibility and durability. Side-by-side comparison Proper...

Short answer: standard PU (thermoplastic polyurethane) timing belts typically serve ambient temperatures of roughly -20 °C to +80 °C. Outside this window the polyurethane body gradually loses flexibility and tensile strength. Special TPU grades and matching cord combinations can extend the range somewhat — tell us the real operating conditions and we will confirm feasibility before you order. Why...