Tensioner Bearings from BMT Bearings hold timing belts and chains at the correct working tension, so the drive stays quiet, the belt does not slip, and the parts around it are not shaken into premature failure. We have produced them in our own plant in Yuyao, Ningbo for more than 20 years, under ISO 9001:2015 and IATF 16949:2016 quality systems.
Our range covers passenger car accessory drives, commercial vehicle engines, agricultural machinery and industrial conveyor systems. If you already have an OEM part number, send it to us — we will match it against our cross-reference database and come back with a quotation and a sample plan.
A tensioner bearing uses a self-adjusting rotating structure that stays in contact with the belt or chain surface and applies constant supporting force. During operation, high rotational speed, load fluctuation and temperature change all make the belt or chain slacken or drift off line. The bearing compensates for that movement in real time and keeps the drive taut.
Accurate tension control does two jobs at once. It removes slip and idling, so power is transmitted continuously and precisely; and it spreads friction stress across the drive, so the belt, pulley and shaft wear more slowly. The benefit is a longer service life for the whole drive system, not only for the bearing itself.
Drive systems apply constant, alternating tension for thousands of hours. These units are sized for that duty, with high static and dynamic load capacity and no deformation, loosening or loss of capacity across the service interval.
Two standard options: alloy steel for stable, cost-sensitive duty with strong wear resistance, and stainless steel for high humidity, dust or mild corrosion — the usual choice for outdoor farm machinery and open-air conveyors.
An enclosed sealing design blocks dust, water and debris before they reach the raceways and balls. That is what keeps the failure rate down on equipment working in mud, straw or wash-down areas.
Precision machining and dynamic balancing give high rotational concentricity and a small vibration amplitude, so the unit runs without abnormal shaking at high speed and keeps drivetrain noise inside automotive limits.
The structure is engineered around mainstream drive systems — engine timing belts and serpentine multi-ribbed belts — so the unit installs directly on OEM replacement jobs without modification.
Non-standard bore, width, seal type, grease grade and packaging can be produced against your drawing. Tell us the working condition and we will propose the specification rather than guess it.
Production runs under a documented quality management system. Each batch is checked for dimensional accuracy, running noise and durability before it leaves the factory, and the inspection records can travel with the shipment.
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Certification |
Scope |
Status |
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ISO 9001:2015 |
Quality Management System |
Certified |
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IATF 16949:2016 |
Automotive Quality Management System |
Certified |
Two further documents are available with your order: a certificate of conformity for the batch, and a dimensional report for the references you bought. If your purchasing process requires them, say so at the quotation stage and we will build them into the order.
These units go wherever a belt or chain has to stay at a set tension:
Check parallelism and alignment between the bearing and the belt or chain before the drive is tensioned. Misalignment loads one side of the unit, and the first symptoms are uneven wear, heat and noise — long before the nominal service life is reached.
Long-term overload or excessive belt tension deforms the structure and damages the seal, which leads to premature ageing and seizure. Use the rated figures in the catalogue, not the tightest setting the adjuster allows.
Insufficient grease, degraded grease or uneven distribution raises internal friction immediately. High temperature, abnormal noise and accelerated wear follow — these are the most common routes to an early failure.
Most buyers come to us with a part number from another brand. Our model database covers Audi, Volkswagen, Ford, Fiat, Peugeot and Škoda, and we cross-reference OEM numbers against SKF, INA and BREDA equivalents as a matter of routine. You can therefore compare our Tensioner Bearings with the product you already buy — on paper, before you commit to a trial order.
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What you send us |
What you get back |
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OEM part number or drawing |
Matched reference, drawing confirmation and price |
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A sample or clear photos of the old unit |
Dimension check and a material recommendation |
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Annual or quarterly volume |
MOQ, price band and a delivery schedule |
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Your packing or labelling requirement |
Neutral, BMT-branded or fully custom packaging |
Bulk supply, export packing and OEM customization are standard for us, and a trial quantity is normally accepted before a volume contract. Related drive components such as clutch release bearings and water pump bearings can be consolidated into the same shipment.
Tensioner Bearings sit against the belt or chain and hold it at a set working tension. They absorb the slack that appears when the drive speeds up, the load changes or the engine bay heats up — which stops the belt from slipping, keeps timing accurate and reduces wear on the belt, pulley and shaft.
In practice, four causes: misalignment at installation, running above the rated tension for long periods, grease that has degraded or leaked away, and a damaged seal letting dust or water into the raceway. Each one usually shows up first as noise, then as heat, then as a seized unit.
Automotive engine timing and serpentine belt drives, industrial conveyor and transfer equipment, and agricultural chain and belt drives. If you are unsure about a particular model, send the OEM number or a photo and we will confirm the match before you order.
Production runs under ISO 9001:2015 and IATF 16949:2016. Each batch is checked for dimensional accuracy, running noise and durability before shipment, and the inspection records can be supplied with the goods. More than two decades of volume production sits behind the process.
Yes. We hold a compatibility database covering Audi, Volkswagen, Ford, Fiat, Peugeot and Škoda, and we cross-reference against SKF, INA and BREDA part numbers. Custom fitment and bulk replacement supply are also supported.
MOQ depends on the reference and the packaging you need; a trial quantity is normally accepted before a volume contract. Samples are quoted separately and can be produced against your drawing or a confirmed OEM number, so you can verify fit and finish before mass production.
Tell us the application and the OEM number. We will confirm which Tensioner Bearings fit, quote in USD, and arrange a sample before mass production — no obligation on your side.
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No.183,Longfeng,West of Zhangting industrial Zone,Yuyao,Ningbo,China
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