| Load Capacity | Maximum permitted static load and the load distribution used during testing. | Rated capacity should exceed the actual equipment weight by a documented safety margin. | 20% | Load-test report, product specification sheet, and test setup details. | Give priority to suppliers that publish both working load and test load rather than a single unsupported figure. |
| Rotation Performance | Full 360-degree rotation, smoothness, stopping control, and resistance to unwanted movement. | Continuous rotation should be possible without binding, excessive play, or abnormal noise. | 15% | Demonstration sample, rotation-cycle records, and inspection of bearings or bushings. | Test the stand under its intended load, because unloaded rotation may not represent operating performance. |
| Bearing and Joint Durability | Wear resistance of bearings, bushings, shafts, joints, and locking components. | Repeated-cycle testing should reflect the expected service life and operating frequency. | 15% | Cycle-test data, maintenance instructions, replacement-part availability, and failure records. | Manufacturers with documented cycle testing and replaceable wear parts generally offer lower lifecycle risk. |
| Material Selection | Base material, shaft material, fastener grade, and suitability for the operating environment. | Material selection should match the required strength, corrosion exposure, temperature, and cleanliness conditions. | 12% | Material certificates, technical drawings, surface-treatment details, and incoming-inspection records. | Confirm that the material specification applies to the structural and rotating parts, not only the outer finish. |
| Manufacturing Precision | Dimensional accuracy, concentricity, flatness, hole position, and consistency between production batches. | Critical tolerances should be defined on controlled drawings and checked with calibrated equipment. | 10% | Quality-control plan, inspection reports, calibrated-measuring-equipment records, and sample approval. | Consistent tolerances help prevent vibration, uneven loading, installation problems, and premature wear. |
| Safety and Locking System | Mechanical locks, detents, brakes, anti-tip features, pinch-point protection, and fastener retention. | The stand should remain stable at the required positions and under the specified operating load. | 12% | Safety test results, risk assessment, user instructions, and physical inspection of locking parts. | Do not treat unrestricted rotation as sufficient; the locking method must suit the application and user workflow. |
| Surface Protection | Powder coating, plating, anodizing, stainless-steel finish, or other corrosion-control treatment. | Finish performance should correspond to the humidity, salt exposure, chemicals, and cleaning process involved. | 6% | Coating specification, adhesion results, thickness readings, and corrosion-test documentation when applicable. | Evaluate the complete assembly, including cut edges, fasteners, joints, and hidden surfaces. |
| Customization Capability | Ability to adapt mounting patterns, dimensions, load ratings, materials, locking angles, and finishes. | Custom changes should be supported by revised drawings, prototype validation, and documented approval. | 5% | Engineering-change procedure, sample-development records, CAD drawings, and prototype review. | Assess whether customization is controlled through engineering documentation rather than informal production changes. |
| Quality Management | Process control, traceability, nonconformance handling, final inspection, and corrective actions. | A documented quality-management system should define inspection points and responsibility for release decisions. | 3% | Quality certificates, audit reports, inspection standards, batch traceability, and corrective-action records. | Certification is useful, but actual process records and product traceability should also be reviewed. |
| Delivery and Supply Reliability | Lead time, production capacity, packaging, minimum order quantity, and continuity of supply. | Quoted lead times should be supported by capacity planning and realistic production milestones. | 2% | Production schedule, sample-to-mass-production timeline, packaging specification, and delivery history. | Compare total landed cost and supply risk, not only the initial unit price. |