In industrial automation, outdoor equipment, new energy and other fields, “IP67” is the most common protection rating for waterproof connectors. However, many customers are unclear about its actual meaning and applicable scenarios. Based on the international standard IEC 60529, this article explains IP67 definition, testing methods and real application boundaries to help you select correctly.

IP67 Breakdown (IEC 60529)
First digit “6”: Dust protection — dust-tight, no dust ingress;
Second digit “7”: Water protection — temporary immersion, 30 minutes in 1m deep clean water at room temperature, no water ingress, no performance impact.

IP67 ≠ continuous underwater use
Common industry misconception: treating IP67 as “permanently submersible”. In fact:
IP67: temporary immersion (≤30 min), suitable for rain, splashing, humid environments;
IP68: continuous deep-water immersion, for subsea equipment, marine engineering (manufacturer must specify depth & duration).

Ulinkcon Self-Locking Connector Protection Design
Ulinkcon M16/M19/M25 self-locking series achieves stable IP67 via double silicone seals + snap-fit locking structure. The threadless design avoids seal failure caused by thread wear, making it more suitable for vibration and frequent mating/unmating. All products are third-party certified for IP67; test data available upon request.
Selecting the correct protection rating is critical for long-term connector reliability. For IP67/IP68 selection advice or test reports, contact the Ulinkcon technical team.