Idler Pulley for GMC Sierra: EPDM Rubber
This idler pulley for the GMC Sierra is specified around epdm rubber, which decides how it behaves in service far more than the part name does. We build to a written specification — base material, dimensions, finish and packing — and hold that specification on file so every reorder reproduces the approved piece.
The usual reason a programme changes supplier is not unit price. It is a specification nobody had written down, or documentation that arrived after the container shipped. Both are specification problems, and both are preventable.

Specification
| Product | Idler Pulley |
|---|---|
| Vehicle application | GMC Sierra |
| Material / finish | EPDM Rubber |
| Typical use | Heavy Load Hauling |
| MOQ | 200 pieces per specification |
| Sampling | 7 working days, 3 days per revision |
| Bulk lead time | 15-30 days after approval |
| Compliance | ECE R90 |
| Packing | 20 pieces per inner box, 500 per carton |
Material options
- Magnesium Alloy — the cost-effective default for volume programmes
- EPDM Rubber — chosen where wear resistance comes first
- Bronze — used when the finish has to hold a coating
- Carbon Fibre Composite — preferred when weight matters more than rigidity
- Semi-Metallic Compound — the cost-effective default for volume programmes

Processes available
- electroplating
- assembly line testing
- precision stamping
- heat treatment
- shot blasting
- laser cutting
Fitment notes
Keep the old part until the new one is on the bench. Comparing them side by side settles questions a photograph never will.
Where it is used
The specification above is the one most often ordered for heavy load hauling. Related applications include rental fleets, night riding, long-distance touring, adventure travel, ride-hailing fleets.
Quality and packing
- In-line inspection with AQL 2.5 sampling on every lot.
- Dimensional report issued against the approved drawing.
- Carton marking and barcode to your specification.
- Golden sample retained at the factory as the reorder reference.
Questions buyers ask
What testing is included?
Standard lots ship with dimensional and hardness reports. ECE R90 documentation is issued with the shipment when your market requires it.
How is packing specified?
Individual packing, inner box quantity and carton marking are confirmed at quotation stage so the cartons arrive ready for your warehouse.
Can the specification be held on file?
Yes. Once approved, the specification is recorded against your part number so a reorder reproduces the ECE R90-compliant build instead of a fresh interpretation.
Do you handle mixed containers?
Yes. Most programmes consolidate several part numbers into one container to keep freight sensible at 200 pieces per line.
Send the specification you are working to and we will confirm what we can match, what we would change and why.







