ASME B18.18.2 pdf download Inspection and Quality Assurance for High-Volume Machine Assembly Fasteners
This Standard is an Acceptance Sampling Plan for high-volume machine assembly fasteners, accessories, and associated parts. It establishes specific inspection functions that must be performed on the finished prod- uct or at the appropriate stage of manufacturing with the objective of ensuring that the accepted product con- forms to all the requirements of engineering drawings, related standards, and/or specifications.
This plan does not necessitate in-process control; how- ever, the producer, at his discretion, may apply in-process control. Adherence to the requirements of this plan does not release the contractor from the responsibil- ity of exercising due care in the production of all parts to the requirements established for all characteristics shown on engineering drawings and related specifications.
Characteristics Unless designated characteristics are specifically specified in the product standard, the applicable characteris- tics include all characteristics of a part that are described by engineering drawings and related specifications. Three levels of inspection — A, B, and C — are provided in the plan. Alternate levels may be designated by the user if required. Refer to Fig. A-1 in Nonmandatory Appendix A to establish alternate levels as required. Any additional characteristic(s) deemed applicable by the user and not appearing in the general plan, or charac- teristics for which the user requires an inspection level other than that designated in the plan, must be explicitly requested by the user and shown on drawings or specifi- cations by the appropriate code letter at the time of ordering (see Nonmandatory Appendix B).
2.3 Lot Definition
A lot is a quantity of product of one part number made from one heat of raw material by the same production process and subsequently submitted for final inspection at one time. In the case of fasteners assemblies, such as screw and washer assemblies, the manufacturer shall maintain lot traceability for all components.
The supplier shall maintain and provide the purchaser logs and records of inspections and tests as required by this plan if requested. Such records shall indicate the nature and number of observations made, the number and type of deficiencies found, the quantities of material or parts approved and rejected, and the nature of the corrective action taken, as appropriate. Records shall also include the disposition of rejected parts in accor- dance with para. 2.9 and shall be maintained for a mini- mum of 1 yr from the date of shipment of the parts.