How the procurement records differ
Automotive synchronous-belt drive matched to the engine's timing pulley system.
Chain-based engine timing drive identified through its own OE and application catalog record.
Engine, source reference, tooth profile and count, width, pitch-length context and readable markings.
Engine, OE or kit reference and the exact application-specific timing component scope.
State belt-only or list every required tensioner, idler, water pump, seal and hardware item.
List only the chain-system components confirmed by the applicable OE catalog or service information.
Application record, reference source, product or kit contents, sample identity and written offer.
Application record, chain or kit reference and documented component contents from the actual source.
DNK publishes Timing Belts and Timing Component Kits.
DNK publishes Timing Chain Kits as a separate product family; fitment and component contents still require application-level confirmation.
Confirm five facts before choosing a path
- Record make, model, model year, engine code or displacement and destination market.
- Use the vehicle manufacturer's catalog or service information to identify the engine timing system.
- Preserve the OE or aftermarket reference and the source where it was found.
- Separate engine timing from the external accessory-drive belt and its tensioning components.
- Keep belt, chain and component-scope fields marked unknown until evidence resolves them.
Write the requested component boundary
Single timing-belt line
Use the exact engine and reference, then add tooth profile, tooth count, width, markings and quantity where known.
Timing component kit
List the belt, tensioner, idlers, water pump, seals and hardware that the actual service or assortment requires. Do not rely on a generic kit name.
Timing chain kit
Record the engine, OE reference and requested chain, guide rail, sprocket, tensioner and hardware scope before comparing the kit.
Application review first
Send the engine and source evidence without selecting a product family. Resolve the timing-system type before comparing parts or prices.
Use sources for classification, not universal service claims
ISO 21342 describes automotive synchronous belts and pulleys for applications including engine camshaft drives, with characteristics such as pitch spacing, tooth dimensions, width and pitch length. Gates publishes separate official categories for automotive timing belts and timing-chain component kits. Those category sources help preserve the distinction; they do not confirm a DNK product, a vehicle fitment or a service interval.
Follow the exact vehicle-manufacturer schedule and service information. This guide does not provide a universal replacement interval, diagnosis or conversion path.
Continue with the correct buyer workflow
Keep one application per RFQ line
The blank RFQ CSV separates engine, source reference, product family, profile, requested components, quantity, evidence and open questions. Use it to keep an unknown timing-system type visible instead of forcing the request into a belt or chain category.
This is application-classification guidance, not fitment confirmation, universal kit definition or a claim that one chain kit covers an unverified engine.