Manufacturing and drawing standards

Unless the quote says otherwise, conflicts are resolved in this order: written quote and approved clarifications; approved drawing; approved 3D model; purchase order; these standards. We will seek clarification where a conflict could materially affect function, price or lead time.

The customer must approve the manufacturing revision before production. Approval confirms part number, revision, units, material, quantity, critical dimensions, tolerances, threads, finishes, inspection requirements and intended application. Verbal changes are not effective until confirmed in writing.

Only dimensions and tolerances stated in the accepted specification are guaranteed. If a dimension needed to manufacture the part is missing, we will request clarification or document a proposed assumption for approval. We do not infer precision tolerances from model appearance alone.

Unless otherwise specified, dimensions apply after machining and before coating. The effect of plating, anodising, paint, heat treatment or other finishing on fit must be identified in the drawing or quote.

Material is supplied to the grade shown on the accepted quote. Mill or material certificates and batch traceability are provided only when quoted. No grade substitution affecting the agreed specification will be made without written approval.

Parts are supplied clean and free from loose burrs. Edge breaks, radii, chamfers, thread class, grain direction, cosmetic surfaces and surface-roughness values must be specified where functionally important. Minor witness marks consistent with the agreed process are not defects unless a cosmetic requirement was quoted.

Normal inspection verifies selected dimensions and visible workmanship appropriate to the job. First-article inspection, full dimensional reports, calibrated reports, CMM inspection, certificates of conformity and third-party testing must be requested before quoting. Measurement disputes will be assessed using an appropriate calibrated method and the approved specification.

Customers must disclose parts intended for lifting, pressure systems, braking, steering, aviation, medical, defence, motorsport safety or other safety-critical use. We may require design verification, engineering certification, additional testing or may decline the work.