Double Sampling Plan
Meaning ~ Acceptance sampling by attributes determines the disposal of manufacturing lots through a maximum of two successive statistical sample assessments.
Thread Check
Meaning
Physical verification of fastener pitch and flank angle confirms that a component fits specified hardware standards. This thread check ensures interchangeability by measuring the tolerances of both male and female connectors before assembly. Mechanical gauges or optical sensors provide the data to certify that internal and external profiles align with ISO or ANSI requirements.
Inspection Procedure
Engineers apply calibrated ring or plug gauges to samples from every production batch to identify deviations in diameter. Such processes detect machining errors before mass assembly begins. Technicians mark non-conforming items for disposal or rework when recorded dimensions exceed established limits.
Performance Liability
Costs rise rapidly when components fail during final integration because manual installation or machine tightening forces a cross-threaded connection. Suppliers carry the financial burden of replacements or labor charges when verification documentation lacks evidence of adherence to the design specification. Claims remain valid only until the product changes state through assembly or permanent torque application.
Documentation Requirement
Quality management systems dictate that the master register stores the results of each test alongside the heat lot identifiers for the raw material. Records demonstrate that the manufacturer maintained process control through consistent measurement intervals. Precise logging of these outcomes validates compliance for insurance purposes and long-term product liability.