NCCER Millwright Practice Exam 2026 - Free Millwright Practice Questions and Study Guide

Question: 1 / 400

The correct mechanical squeeze for an O-ring is usually equal to what percentage of the O-ring for static applications?

90-100 percent

40-50 percent

20–30 percent

The mechanical squeeze for an O-ring in static applications is typically recommended to be within the range of 20-30 percent of the O-ring's cross-sectional diameter. This level of squeeze ensures an effective seal by allowing the O-ring to deform adequately and fill the gaps between the mating surfaces. It balances the need for a tight seal while preventing excessive compression that could lead to deformation or damage to the O-ring material over time.

An O-ring that is compressed within this optimal range can maintain its flexibility and resilience, allowing it to perform effectively under pressure and temperature variations without compromising its sealing properties. This level of squeeze is also important for preventing leakage and ensuring long-term reliability in various applications.

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80-90 percent

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