Direct answer: Fix the approved sample, latest drawings, product IDs and written tolerances before inspection. Then check six areas: document baseline, granite and batch, dimensions and geometry, finish and appearance, edges and custom details, and packing traceability. Every result should connect to a measured value, photograph or part record rather than only stating “accepted”.
Updated 2 September 2026 · Prepared from the current quality-control and project-procurement information of Shandong Kaizhong Stone Co., Ltd.
Six inspection areas and the records to retain
01 / INSPECTION
Documents and acceptance baseline
Confirm the latest drawing, cutting list and product IDs
Record the approved sample, finish and acceptable colour range
Define measuring tools, sampling and exception handling
Suggested record: Document revision, approval date, sample ID and responsible person
02 / INSPECTION
Granite, batch and colour
Match the granite name to batch or block records
Compare colour and pattern under consistent light and dry conditions
Use agreed sorting or dry lay for large visible areas
Check both diagonals and squareness for rectangular pieces
Verify holes, slots, chamfers, radii and joint relationships
Suggested record: Measured values, allowed tolerance, sample count and exception ID
04 / INSPECTION
Finish and appearance
Compare flamed, bush-hammered, polished or honed finish with the physical sample
Check consistency, contamination, scratches and repair marks
Separate natural characteristics from contract-defined rejection defects
Suggested record: Finish sample, light condition, appearance grade and photographs
05 / INSPECTION
Edges and custom details
Check chips, broken corners, cracks and continuous edge lines
Verify face, orientation and installation number against drawings
Trial-fit key interfaces for stairs, profiles or complex components
Suggested record: Part ID, fit result, rework or replacement status
06 / INSPECTION
Packing and traceability
Separate accepted products from material awaiting action
Reconcile case, part, quantity, orientation and weight records
Check separators, corner protection, supports and straps
Suggested record: Inspection status, packing list, packing photographs and dispatch link
What should be checked by product type?
ProductDimensions and geometryFinish and appearancePacking and installation link
Pavers and slabsLength, width, thickness and diagonalsFinish consistency, colour and edgesLayout direction, quantity per pallet and protection
KerbstonesLength, section dimensions and straightnessWorked faces, chamfers, ends and cracksSeparate sizes, protect ends and confirm lifting
Stairs and treadsLength, width, thickness, nosing and slotsSlip-resistant face, visible edges and joint colourLevel or position IDs, trial fit and edge protection
Cladding panelsLength, width, thickness, diagonals, holes and slotsVisible face, vein direction and dry-lay resultElevation IDs, installation direction and upright support
Custom and carved piecesDrawing control dimensions, interfaces and locating pointsProfile, detail completeness and repair statusPart IDs, assembly relationship and custom supports
Minimum fields in a traceable inspection record
These eight information groups connect an observation to a specific component, drawing and package for reinspection, rework, replacement and arrival checks.
01Order, project and case number
02Granite, batch and part ID
03Drawing or cutting-list revision
04Measured length, width, thickness and diagonals
05Finish, colour and appearance result
06Hole, slot, edge or custom-interface result
07Inspection date, person and exception status
08Inspection photographs, dry lay and packing reference
Limits of tolerances and test values
This page does not publish one universal tolerance because pavers, kerbstones, cladding, stairs and custom components differ in function, dimensions and installation. The applicable tolerance, sampling ratio and acceptance criteria must follow the project drawing, order, contract or agreed standard.
Compressive strength, flexural strength, water absorption and other physical properties must correspond to the selected granite, sampling and a valid test record. Values are not presented as verified facts without supporting documents. Continue with the quality-control process, factory audit checklist and packing guide.
QUALITY INSPECTION FAQ
Questions about engineering granite inspection
What dimensional tolerance should be used for granite?
No single value fits every stone product. The tolerance should reflect product type, size, thickness, process, installation system and project standard, and it should be written into the drawing or order with a consistent measuring method.
Can an approved sample represent the colour of the full order?
No. Natural granite varies between batches and across slabs. A sample sets the granite and approximate range; a large visible area also needs batch control, sorting rules, dry lay, replenishment and batch-change instructions.
How many pieces should be sampled?
The contract, project standard or inspection plan should define the sample size and adjust it for order volume, product risk and process stability. First articles, critical custom pieces and products after a non-conformance generally need stronger verification.
What should be ready for a third-party inspection?
Prepare current drawings, cutting lists, approved samples, product and case lists, measuring tools, completed-goods areas and exception records. Confirm inspection scope, sampling and release conditions in writing before the visit.
What should a buyer do if damage is found on arrival?
Photograph the case, straps, labels and products continuously before and during unloading, retain packing and transport records, isolate affected pieces and record part IDs, quantities and positions before notifying the responsible parties under the contract.