| Base Material | 15% | Material should match the application. Common choices include stainless steel for moisture resistance, brass for decorative durability, and zinc alloy for complex shapes and controlled cost. | Request the material specification, alloy or grade, supplier declaration, and representative sample. Confirm that the declared material is consistent across the full order. | Prefer clearly specified materials over vague terms such as “metal” or “premium alloy.” |
| Corrosion Resistance | 15% | Finishes should be evaluated according to the intended environment, especially kitchens, bathrooms, coastal areas, and commercial spaces. Neutral salt spray testing can be performed under ISO 9227, but acceptance hours must be agreed by finish and use case. | Ask for an independent or traceable test report stating the test method, exposure time, substrate, coating system, and corrosion rating. | Do not compare salt-spray hours unless the test conditions and rating method are identical. |
| Finish Consistency | 12% | Visible surfaces should have uniform color, gloss, texture, edge coverage, and adhesion, without blistering, peeling, pinholes, sharp burrs, or exposed base metal. | Approve a signed or retained reference sample. Define acceptable color variation, surface defects, inspection lighting, and inspection distance in the purchase specification. | Consistent finish reduces installation rejects and improves the perceived value of the entire cabinet. |
| Load Capacity and Structural Strength | 15% | Handles, knobs, brackets, and support fittings should withstand the expected static and repeated loads without cracking, loosening, permanent deformation, or pull-out. | Request product-specific load data and test conditions. Confirm the mounting hardware, screw size, substrate, tightening torque, and safety factor used in the test. | Use the stated capacity only when it reflects the complete installed assembly, not the part alone. |
| Operating Cycle Life | 12% | Moving components such as hinges, slides, catches, and lift mechanisms should be tested through repeated opening and closing cycles appropriate to their application. | Obtain the cycle count, test load, test speed, adjustment limits, failure criteria, and whether the result applies to the exact model being purchased. | Longer verified cycle life generally offers better value in frequently used residential or commercial cabinetry. |
| Dimensional Accuracy and Compatibility | 10% | Hole spacing, mounting depth, screw position, plate alignment, and component tolerances should match the approved technical drawing. Common handle center-to-center sizes include 96 mm and 128 mm, but the required size depends on the cabinet design. | Review dimensioned drawings and first-article samples. Check interchangeability with the specified doors, panels, hinges, drawer systems, and installation tools. | Accurate dimensions reduce rework, misalignment, drilling errors, and installation labor. |
| Ergonomics and Safety | 8% | Frequently touched parts should have comfortable grip geometry, smooth edges, secure fastening, and no accessible sharp projections or pinch hazards under normal use. | Conduct a physical sample review for grip comfort, edge condition, movement smoothness, clearance, and screw retention. | A slightly higher purchase price can be justified when the fitting improves daily usability and reduces safety complaints. |
| Supplier Quality System | 6% | A dependable supplier should use documented incoming inspection, in-process controls, final inspection, nonconformity handling, and lot traceability. | Request a quality manual or process overview, inspection records, corrective-action examples, and the sampling plan used for finished goods. | Process control is more reliable than judging quality from a single attractive sample. |
| Packaging and Logistics Protection | 4% | Packaging should prevent scratching, finish contact, deformation, moisture exposure, and mixing of different sizes or finishes during transport. | Review packaging samples, inner separators, labeling, carton strength, moisture protection, and spare-part policy. | Effective packaging protects the product value between factory inspection and installation. |
| Total Cost of Ownership | 3% | Compare unit price together with tooling, sampling, freight, installation time, replacement parts, warranty support, expected service life, and reject rate. | Build a landed-cost comparison using the same quantity, specifications, testing requirements, delivery terms, and warranty conditions. | The lowest unit price is not necessarily the lowest total cost when failures and replacement labor are included. |