5. Assembly and Fit Specifications

These define how parts should fit together in assembly and their interaction with other components.

• Fits: Specifies the type of fit required between mating parts (e.g., Interference fit, Clearance fit, or Transition fit). E.g., "Hole diameter: 20mm, Shaft diameter: 19.9mm for a clearance fit."
• Thread Specifications: Defines the size, pitch, and tolerance for threaded features (screws, bolts, nuts). E.g., "M8x1.25, 6H thread tolerance."
• Clearance: The space between two mating parts to ensure smooth movement. E.g., "Clearance: 0.1mm between the shaft and bearing."

6. Testing & Inspection Specifications

Defines the tests or inspections the part must undergo to ensure it meets the quality and functionality requirements.

• Dimensional Inspection: A detailed inspection process to ensure that each part meets the specified dimensions and tolerances. Often performed using CMMs, micrometers, or calipers.
• Visual Inspection: A general check for defects such as cracks, burrs, or surface imperfections.
• Functional Testing: For parts that have specific functional requirements, such as pressure testing or leak testing.
• Non-Destructive Testing (NDT): Methods like ultrasonic testing, X-ray inspection, or magnetic particle inspection to check for internal defects without damaging the part.
• Certification: Some industries require parts to be certified for specific standards (e.g., ISO 9001, AS9100 for aerospace parts, or FDA certifications for medical components).