Custom or stock timing belt: when is a made-to-order belt worth it?

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Direct answer: Choose stock when a catalogue belt matches your pitch, tooth count, length and width. Choose made-to-order when one of those dimensions or features is not available, or when adapting the machine to a stock size would cost more than the belt itself. Custom is a fit decision, not a quality upgrade.Standard L-pitch belts such as 337L-25 cover a large share of replacement demand without any tooling.The four cases that justify a made-to-order beltThe length is not standard. A fixed motor position and a non-standard centre distance often need a length that no catalogue covers.The width is not standard. Too wide fouls the frame, too narrow loses capacity. Slitting or a mould is the answer.The tooth count is fixed by the machine. When a pulley pair sets the tooth count, the belt has to match it, not the other way round.Features are needed. Cleats, coatings, ground teeth, punched holes or a specific cord are added to a base belt and cannot be bought off the shelf.Ground teeth and punched holes on this 3GT belt are added operations: that is what makes it a custom item.Stock against made-to-orderPointStock beltMade-to-order beltLead timeFrom stock, days rather than weeksProduction run, confirmed per orderCostCatalogue priceBase belt plus tooling where a new mould is neededFitOnly if a catalogue size matches every dimensionBuilt to the drawingMinimum quantityOften a single pieceDepends on the construction, ask per itemRiskLow, but the machine may need adaptingDesign must be agreed before production startsA stock L-pitch belt with an added PVC layer: the base belt is standard, the backing makes it made-to-order.How to decide in one passWrite down pitch, tooth count, pitch length, width and any feature. Those five items decide almost every case.Check whether a stock belt matches all five. If it does, buy stock and keep the money for spares.If one dimension is only slightly off, ask whether the machine can move instead: motor slots, an idler or a different pulley are often cheaper than a new mould.If the machine cannot move and the dimension is fixed, go made-to-order and put everything on a single drawing. Made-to-order does not mean unlimited. Maximum length, minimum width and the available tooth profiles still apply, so confirm the limits before you design around them.Send the five numbersEmail sales@goodlybelts.com with pitch, tooth count, pitch length, width and any features, or use the enquiry form. We will tell you whether a stock belt fits, or quote a made-to-order belt with the lead time stated up front.Ask for a fit check

Custom or stock timing belt: when is a made-to-order belt worth it?

The four cases that justify a made-to-order belt

Stock against made-to-order

How to decide in one pass

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Point	Stock belt	Made-to-order belt
Lead time	From stock, days rather than weeks	Production run, confirmed per order
Cost	Catalogue price	Base belt plus tooling where a new mould is needed
Fit	Only if a catalogue size matches every dimension	Built to the drawing
Minimum quantity	Often a single piece	Depends on the construction, ask per item
Risk	Low, but the machine may need adapting	Design must be agreed before production starts