| Bracket type | Clamp-style brackets, support pins, concealed supports, and wall-mounted shelf supports. | Confirm whether the design suits the intended installation, shelf edge, wall construction, and required appearance. |
| Compatible glass thickness | Specify the exact glass thickness required. Some adjustable clamp designs cover a stated range; compatibility is product-specific. | Obtain the supplier’s dimensional drawing and confirm the minimum and maximum glass thickness before ordering. Do not assume one bracket fits all glass. |
| Load capacity | Request the stated load per bracket and per shelf, along with the test method and installation conditions. | Check whether the rating accounts for the number and spacing of brackets, wall substrate, fasteners, shelf dimensions, and load distribution. Avoid comparing ratings tested under different conditions. |
| Material and corrosion resistance | Common materials include stainless steel, zinc alloys, and aluminum alloys. Stainless steel grades such as 304 and 316 are used in different environments. | Request the exact material grade and any supporting documentation. Consider 316 stainless steel for more corrosive environments, while verifying suitability for the actual exposure and finish. |
| Finish and appearance | Possible finishes include brushed, polished, plated, and coated surfaces. | Ask for finish specifications, color references where applicable, sample approval, and confirmation that production finish will match the approved sample. |
| Glass protection | Some clamp brackets use pads or liners between the metal and glass; designs and replacement options vary. | Confirm pad material, fit, and replacement availability. Installation should avoid point loading, overtightening, and direct metal-to-glass contact unless the product instructions specifically permit it. |
| Drawings and product data | Request a dimensioned drawing, material details, finish information, installation instructions, and product-specific load data. | Check hole positions, bracket projection, glass engagement, fastener requirements, and tolerances against the project drawings before approving production. |
| Testing and compliance evidence | Request relevant test reports or declarations for the specific product and intended application. | Verify the issuing laboratory, test scope, product model, and report date. Do not treat a general quality-management certificate as proof of a bracket’s load capacity or product compliance. |
| Supplier quality controls | Ask about incoming material checks, dimensional inspection, finish inspection, traceability, and handling of nonconforming goods. | Agree on inspection criteria and acceptance requirements before production. A quality-management certificate, if supplied, does not replace product-specific inspection or testing. |
| Samples and pre-production approval | Request samples or a pre-production sample for fit, finish, and installation review. | Record the approved sample, drawing revision, and specifications in the purchase order to reduce the risk of substitutions or mismatched production. |
| Quotation and order quantities | Request unit pricing at relevant quantities, minimum order quantity, tooling charges if any, sample costs, and spare-part pricing. | Compare quotations on the same material, finish, packaging, quantity, and delivery basis. Minimum order quantities and prices vary by supplier and specification. |
| Lead time and production capacity | Ask for sample lead time, production lead time, order cut-off dates, and the estimated ready-to-ship date. | Get the schedule in writing and confirm which events start the production clock, such as deposit receipt or drawing approval. Lead times are order- and supplier-specific. |
| Packaging and shipment protection | Confirm individual protection, carton quantity, carton dimensions and weight, and export packing requirements. | Request packaging details suitable for international handling and confirm who is responsible for any project-specific labeling or pallet requirements. |
| Trade terms and freight | Compare quotations using a clearly stated Incoterms® 2020 rule and named place or port, where applicable. | Clarify which party arranges carriage, export clearance, insurance, import clearance, and delivery costs under the chosen rule. Incoterms® do not determine product quality or payment terms. |
| Import classification and documents | Request a commercial invoice, packing list, transport document, and any origin or compliance documents required for the destination. | Confirm the applicable tariff classification, duties, taxes, and document requirements with the destination country’s customs authority or a qualified customs broker. Classification can depend on product details and local rules. |
| Payment and contract terms | Document the price, currency, payment milestones, inspection arrangements, delivery schedule, and remedies for nonconforming goods. | Use a written purchase order or sales contract, and agree on the process for claims, replacement parts, and warranty handling before payment. |
| Warranty and after-sales support | Ask for the warranty period, covered defects, exclusions, claim evidence, and availability of replacement pads or hardware. | Confirm the warranty’s start date, geographic coverage, and return or replacement process in writing. Terms vary by supplier and transaction. |