Specify the actual receiving geometry
Describe a straight or tapered hole, its tolerance, depth, draft, entry and surrounding wall. A single nominal hole diameter omits information that affects fit and installation.
Coordinate the insert and hole
Use the selected insert design and host material as the basis for the receiving hole. Changing a knurl, body profile or material can require a new installation review; do not carry a hole dimension across unrelated insert families.
Check screw clearance and engagement
Show the mating screw and its position at full assembly. Establish enough intended thread engagement without unintended bottoming or interference. Include the clearance hole in the mating component.
Look beyond the immediate boss
Review ribs, nearby walls, edge distances, molding constraints and load paths. The design needs to support both installation and the assembled connection.
Validate the combination
Use representative plastic parts and record the insert revision, hole condition and installation process. Hole recommendations are starting inputs for the specific design, not universal dimensions for all plastics.