| Product range | Options such as carrying, return, impact, and self-aligning idlers, selected for the conveyor layout and operating conditions. | Product catalogue, drawings, and a written confirmation that the proposed roller type suits the application. |
| Roller construction | A defined construction covering the shell, shaft, bearings, seals, and end components. Material selection should reflect load, environment, and maintenance requirements. | Assembly drawings, material specifications, and details of the proposed bearing and sealing arrangement. |
| Dimensions and fit | Roller diameter, face length, shaft ends, and mounting details made to the project specification; these dimensions are not universal across conveyor systems. | Dimensioned drawings and documented inspection results for critical dimensions and fit. |
| Operating conditions | Selection based on belt width, material load, belt speed, temperature, dust, moisture, and other site conditions. | A completed application data sheet and written confirmation of the design assumptions and operating limits. |
| Sealing and environment | Sealing and corrosion-protection choices matched to the expected exposure, including dust, water, or corrosive conditions where applicable. | Seal details, coating or material specifications, and any relevant test or inspection records. |
| Quality management | A documented process for incoming-material checks, production inspection, and final inspection. ISO 9001 certification, if claimed, concerns a quality management system. | A current certificate that can be independently checked, plus a sample inspection plan or quality record. |
| Testing and traceability | Inspection methods appropriate to the agreed design, with production batches identifiable through records. | Test reports, inspection criteria, batch or serial-number traceability, and the agreed acceptance requirements. |
| Standards and documentation | Clear identification of the standards and project specifications used. GB/T 10595-2017 is a Chinese national standard for belt conveyors; confirm the relevant requirements for the specific project. | A standards-compliance statement that identifies the applicable edition and explains which requirements apply to the supplied rollers. |
| Customization and delivery | Ability to confirm non-standard dimensions, packaging, order quantities, lead time, and replacement-part availability before production. | A signed quotation, approved drawings, production schedule, packaging details, and after-sales terms. |