| Product coverage | Confirm capability for hydraulic rod seals, piston seals, wipers, O-rings, and backup rings used in pallet truck cylinders. | Match the supplier’s product range to the cylinder design, groove dimensions, and replacement parts required. |
| Material selection | Request the compound designation and compatibility data. Common seal materials include NBR, polyurethane (PU), and FKM; suitability depends on fluid, temperature, pressure, and wear conditions. | Check compatibility with the specified hydraulic fluid and operating environment rather than selecting by material name alone. |
| Hardness and compound data | Ask for Shore hardness, test method, compound data sheet, and batch-to-batch control information. NBR compounds are commonly available in hardness grades such as 70, 80, and 90 Shore A. | Compare values only when the test method and material formulation are clearly stated. |
| Operating conditions | Provide working pressure, temperature range, reciprocating speed, fluid type, duty cycle, and expected service environment for the application. | Require application-specific limits from the supplier; allowable conditions vary by seal design, material, and installation. |
| Standards and drawings | Use controlled drawings and dimensional requirements. ISO 3601 covers O-rings; ISO 6194 covers rotary shaft lip-type seals and is relevant only when that seal type is used. | Confirm that any cited standard applies to the specific seal type and that the supplied part matches the agreed drawing revision. |
| Dimensional control | Request inspection reports for critical dimensions, including seal diameter, cross-section, lip geometry, and any application-specific tolerances. | Check measurement methods, sampling plans, and tolerance agreement before approving production parts. |
| Quality management | Review the quality management system, inspection procedures, nonconformance process, and current certification scope where applicable. | Verify certificate validity and scope directly; a quality-system certificate does not by itself certify an individual seal’s performance. |
| Traceability | Confirm whether production lots can be linked to material batches, manufacturing dates, and inspection records. | Agree on lot identification and record-retention requirements before placing repeat orders. |
| Sampling and validation | Request samples or a pre-production batch and test fit, leakage, wear, and compatibility in the intended cylinder and fluid system. | Approve production only after the sample passes agreed inspection and application tests. |
| Tooling and customization | Clarify tooling ownership, setup charges, design-change approval, and whether custom profiles or non-standard dimensions can be produced. | Record ownership and change-control terms in writing to reduce delays during future sourcing or supplier transitions. |
| MOQ and production lead time | Request the minimum order quantity, sample lead time, standard production lead time, and capacity for repeat orders. | Compare like-for-like quotations and confirm lead times for the required material, tooling, and order quantity. |
| Export documentation and packaging | Agree on commercial documents, country-of-origin information, shipment terms, packaging, labeling, and protection from contamination or deformation. | Check destination-market import requirements and ensure packaging supports the planned transport and storage conditions. |
| After-sales support | Confirm technical response channels, complaint handling, replacement-part availability, and the information required for failure analysis. | Set clear response and corrective-action expectations for warranty claims and recurring quality issues. |