What Does Our Factory Check Before You Approve a Belt Drawing?
Our factory builds and inspects every custom belt against the drawing you sign. Before you approve it, we check each dimension against your old belt or original drawing, so a missed line on paper does not become a wrong belt in the machine. See our metal conveyor belts.
Short answer
Before approving a custom conveyor belt drawing, check the dimensions and pitch, the edge and drive details, the material and finish, the tolerances, the spare parts and the packing. The drawing you sign is what the belt is built and inspected against, so close every open question on it.
I am Sunny Ye, Global Sales Director at YIYI MESH BELT in Ningjin, Shandong, China. Our manufacturing experience dates back to 1998. Every belt we make starts with a drawing the customer signs, and this is the checklist I go through with buyers before they sign.
At a glance
| Product | Any custom metal conveyor belt |
|---|---|
| Application | New equipment, OEM supply, replacement belts |
| Key parameters to confirm | Dimensions, pitch, edge, drive, material, finish, tolerances, spares, packing |
| Buyer type | OEM engineers, distributors, purchasing and maintenance teams |
| What to send for a quote | Your drawing or sample; we return our production drawing for approval |
Why does the drawing approval matter so much?
The approved drawing is the contract between your machine and our workshop.
The drawing approval matters because production follows the drawing you sign, and final inspection checks the belt against it. For customized products, final dimensions and tolerances are controlled by the customer-approved drawing. What is clear on the drawing is clear in the belt; what is missing is left to interpretation.
When a customer sends a drawing, we still return our own production drawing. It shows how we will build the belt and adds our suggestions, for example on the edge or the spare parts. The customer signs that drawing back.
This step catches most problems early. A question on paper takes a day; the same question after production takes weeks.
Which dimensions should you check line by line?
Check the dimensions that decide fit first.
Check the overall width, the length and how it is split into sections, the mesh and rod pitch, the wire and rod diameters, and the edge dimensions. For chain-edged belts, also check chain pitch, roller diameter and chain centre distance. Compare each value with the machine itself.
| Line on the drawing | Check against |
|---|---|
| Width and length | Machine frame, sections for installation |
| Pitch | Sprocket or drive, product size |
| Wire and rod | Load and open area |
| Edge | Guides, rails, chain or guards |
| Chain (if any) | Chain pitch, roller, centre distance |
How do you check material, finish and tolerances?
Three lines are easy to skip: material, finish and tolerance.
Check that the material grade matches your product and cleaning, that the finish is stated, for example pickling or electropolishing, and that the tolerances on width and pitch are written. If a tolerance is missing, ask for it; a belt is checked against the numbers on the drawing.
For example, our self-stacking replacement drawing for one plant stated the width as 660 mm, +0 / −2. That one line told our inspectors and the buyer exactly what was acceptable.
Material documentation for your order can be prepared when you need it. Put the requirement on the drawing or the order so it is planned with production.
What else belongs on the drawing besides the belt?
Spares, sprockets and packing are part of the order, so they belong on the drawing.
Add the spare parts, any sprockets or accessories, the number of sections and the packing to the drawing or its notes. Spare rods, washers, spirals and chain pins are easy to forget and hard to send later. Sprockets on the same drawing are checked against the belt before shipment.
For one frying-equipment maker we supplied spare rods, washers, spiral wires and chain pins with three belts. They were listed on the drawing, so they were packed with the belts instead of following by air.
When this is not the right choice
Signing a drawing you have not checked is not a shortcut. If you do not have time to review it, tell us which lines matter most and we will walk you through them.
A drawing is also not the right place to fix a process problem. If the old belt failed, solve the cause first; then draw the belt.
From our engineering experience
When an equipment maker sent drawings for three chain driven belts, we quoted, drew the belts ourselves and the customer signed our drawings back. A trial section was measured and photographed for approval before mass production.
The drawings that cause the fewest problems are the ones where the buyer asked questions before signing. My advice: read every line, and ask about anything you would not be able to check on delivery.
Evidence from our work
- Situation
- Three SUS304 chain driven belts, 145 m each, for frying equipment, built from the customer’s drawings.
- What we checked
- Our production drawings stated C2042 chain at 25.4 mm pitch, roller 15.88 mm, 6 mm rods at 50.8 mm, 1.0 mm spiral wire and the spare parts; the customer signed them back.
- Why it matters
- With every line agreed, the trial section and the final inspection had a clear reference.
- Result
- About 436 m of belt shipped with the listed spares after a white-glove cleanliness check.
- Buyer lesson
- Close every question on the drawing, and the belt has nothing left to interpret.
FAQ
Do you always send a drawing for approval?
Yes, for custom belts. We return our production drawing with suggestions, and production starts after you sign it.
Can I change the drawing after approval?
Before production starts, yes; tell us as early as possible. After production starts, changes are reviewed case by case.
What if I do not understand a line on the drawing?
Ask. We explain every dimension and note before you sign.
Are tolerances included?
Final dimensions and tolerances follow the drawing you approve. If a tolerance you need is missing, we add it.
Can sprockets be on the same drawing?
Yes. Sprockets specified with the belt are checked against it before shipment.
Conclusion
Check dimensions, pitch, edge, drive, material, finish, tolerances, spares and packing before you sign. The signed drawing is what your belt is built to.
Useful files for your project
I work on metal conveyor belt projects, from new spiral freezers to belt replacement. I share project notes and replacement checklists on LinkedIn.
Technical reviewer: Sunny Ye, Global Sales Director, YIYI MESH BELT · Last updated: 2026-10-12