O-Ring Size Guide: How to Measure, Identify, and Order the Right Size Every Time
Maggie
August 31, 2026
August 31, 2026
Why O-Ring Size Matters More Than It Seems Choosing an O-ring is often treated as a simple measurement task: measure the old seal, find the closest size in a chart, and place an order. In engineering applications, however, O-ring size selection is a sealing-design problem, not simply a dimension-matching exercise. The correct O-ring must match the groove geometry, required squeeze,