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Mar. 29, 2026
Thread Insert Design Guidelines for Injection Molded Parts
Proper design of plastic components is critical for achieving reliable insert performance.
Key design factors include:
• hole size
• boss diameter
• wall thickness
• insert placement
Hole Size Requirements
Hole size directly affects insert performance.
If the hole is too large:
• torque resistance decreases
• pull-out strength is reduced
If the hole is too small:
• plastic stress increases
• Cracks may occur during installation
Correct hole sizing ensures proper plastic flow around the insert features.
Boss Diameter Recommendations
The plastic boss surrounding the insert must be strong enough to support installation forces.
Typical guideline:
Boss diameter = 2 to 3 × insert diameter
This prevents deformation or cracking during installation.
Molded Holes vs Drilled Holes
Molded holes are generally preferred because they provide:
• stronger plastic structure
• improved insert retention
• better dimensional accuracy
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