1) There are two dangers in the inspection of the fasteners: there are two problems in the inspection of the fasteners: less samples or samples taken are not representative of the quality of the batch, and they are presented as well-proportioned (usually called producer hazard α) or shoddy ( Often referred to as user hazard beta).
2) Does the screw manufacturer have a high probability of accepting qualified fastener products? Both sides of the transaction expect that the qualified lot should have a high probability of acceptance, and the unqualified lot can be rejected. This is the sampling plan. The ability to check.
The question now is how to use an accurate sampling inspection plan to deal with the above two sampling hazards, that is, it can reflect the quality status of the batch as it is and can be accepted by both sides of the inspection.
Screw manufacturer's inspection of fasteners is an extremely important basic specification, and is the basis for accepting or rejecting fastener products submitted for inspection on both sides of supply and demand. To this end, many countries have developed corresponding inspection and inspection standards for fasteners, especially fastener import and export transactions in the United States, Germany, Japan, the United Kingdom and Australia and China and other countries have announced the corresponding fastener inspection See the specification or inspection specification. The world standardization arrangement also issued the ISO 3269 “Fastener Inspection and Inspection” specification in 1983. It has now revised and issued the third edition of ISO 3269:2000 (GB/T 90.1—2002, idt has been selected equally). Following the development of the transaction and the continuous improvement of the user's request for the quality of the fasteners, the testing and inspection specifications for fasteners in each country are also continuously improving and improving.