IP67 vs. IP68 Waterproof Connectors: How to Choose

The short version: IP67 means the connector survives 30 minutes in 1 meter of water. IP68 means whatever the manufacturer says it means—depth, duration, conditions, all set by the test spec, and none of it carries over from one product to the next. Two connectors can carry the same IP68 label and have entirely different real-world limits.

So don’t just pick the higher number. Choosing between IP67 and IP68 waterproof connectors depends on how water reaches the connection point, how long it stays there, how the cable is routed… The difference between IP67 and IP68 waterproof connectors comes down to immersion. How deep, and for how long.

Here’s how IP67 vs IP68 waterproof connectors work in practice, and what to check before you send out a PO. If you already know your environment and just want the short answer, skip to the checklist at the end.

What an IP Rating Actually Tells You

An IP rating is a test result, not a promise. “IP” stands for Ingress Protection, and the two digits measure two separate things: the first covers solid objects and dust, and the second covers water.

For outdoor connectors, everyone stares at the second digit—fair enough—but it only means something in context. The rating is tested on a specific assembly under IEC 60529, the international standard that defines Ingress Protection test methods. The enclosure design, the mating interface, the cable entry seals, even how the installer tightens the gland — any one of these can be the reason the connector in your machine misses the number on the datasheet.

Worth knowing too: an IP rating says nothing about UV, salt spray, vibration, chemicals, or thermal cycling. A connector can be perfectly IP68 and still die in two years of direct sun.

IEC — the official IP rating explainer

The IP67 vs IP68 Difference: What Actually Changes

The core IP67 vs. IP68 difference is immersion. How deep, and for how long?

IP67 (IPX7 under IEC 60529) is tested for temporary immersion, typically 1 meter for 30 minutes. Rain, splash, washdown—the kind of water that comes and goes. That covers a lot of outdoor equipment, honestly.

Wikipedia — the IP Code, digit by digit

IP68 (IPX8) is tested for immersion, but the manufacturer sets and documents the depth and duration. One product might be rated 1.5 meters for 24 hours. Another might claim 30 meters for a week. Both are IP68. The label alone does not tell you which one you are buying—a point NEMA’s enclosure ratings guidance makes as well when comparing ingress-protection systems across regions.

This situation is where sourcing trips people up. Two suppliers quote you IP68 connectors, and unless you compare the test conditions, you’re comparing nothing. That’s why we send the datasheet with every quotation instead of just quoting “IP68.”

When IP67 Waterproof Connectors Are Enough

Most outdoor equipment never goes underwater. It gets rained on, splashed, and hosed down now and then, maybe standing in a puddle for a while. If that matches your reality, an IP67 waterproof connector is usually the right call, and it is the cheaper one.

Typical IP67 applications:

• Outdoor control enclosures with protected connection points
• Equipment mounted above ground where water can drain away
• Outdoor lighting and signaling systems
• External cable connections on industrial machinery
• Solar or energy interfaces outside flood zones
• Portable equipment stored in protected conditions

Installation matters just as much as the rating. A downward-facing cable entry, a drip loop, strain relief, and good drainage—these habits keep water away from the connection in the first place. They don’t replace the rating, but they’re the reason it holds up in the field instead of only in the test lab.

Choose IP67 when temporary immersion matches your actual risk, and you can install the full assembly per the manufacturer’s instructions. You can browse IP67-rated options here if you want to compare configurations.

When to Choose IP68 Waterproof Connectors Instead

An IP68 waterproof connector earns its keep when the connection can sit in water for a long time or when it gets flooded repeatedly. Consider it when:

• The equipment sits in low-lying areas where water collects.
• The connection sees periodic flooding or prolonged standing water.
• Maintenance access is expensive. A failed connector inside a buried enclosure is a dig-up job.
• The application needs documented margin, not just a label, on top of occasional exposure.
• Moisture exposure is persistent rather than occasional.

Take a cable gland inside a weather-protected cabinet: it does not need the same protection as a connector near ground level in an area with poor drainage. And anything near marine environments, agricultural washdown, or industrial cleaning needs evaluation beyond its IP rating, no matter what.

Before you spec IP68, ask for the defined test conditions. “IP68” should start the conversation, not end it. On our side, immersion conditions—depth, duration, water temperature, and pressure—are documented per series in the datasheet, and we send them on request. You can also compare IP68 options in the LP series.

The Rating Is Not the Whole Story

Water is only one way outdoor connectors die. Here is what else to check when comparing IP67 vs. IP68 waterproof connectors for your project.

Cable Diameter and Seal Fit

The seal only works within a cable outer-diameter range. If the cable is too small, too large, out-of-round, or has a damaged jacket, the sealing element won’t compress the way it should—and the “waterproof” connector leaks exactly where you’d expect.

Confirm before ordering:

• Supported cable outer-diameter range
• Sealing insert or cable gland configuration
• Cable jacket material compatibility
• Strain-relief requirements
• Termination instructions and assembly torque

The approved cable range and torque values are listed in the installation instructions for each connector series. We include them with every quotation, so the configuration is confirmed before you order, not after it fails.

Mated Assemblies and Unused Ports

The rating applies to a fully mated connector. A loose cap, an unsealed unused port, a receptacle without its panel seal—the enclosure is only as good as its weakest opening.

Check the whole path, not just the connector body:

• Plug and receptacle compatibility.
• Protective caps and sealing covers
• Cable-side sealing components
• Panel-mount seals, if applicable
• Unused port protection
• Recommended installation tools

Everything Else the Outdoors Throws at It

UV, temperature extremes, thermal cycling, humidity, salt spray, vibration, chemicals, cleaning agents, and electrical load. An IP rating covers none of those by default. If your application involves two or three of them, pull the datasheet and check the environmental data for the specific model before you commit.

A Checklist Before You Specify IP67 or IP68 Waterproof Connectors

Run through this before finalizing a spec or requesting a quotation:

1. Define the water exposure. Rain, splash, washdown, temporary standing water, periodic flooding, or continuous immersion?
2. Review the mounting position. Above ground, inside an enclosure, near a drain path, or somewhere water pools?
3. Identify electrical requirements. Circuit count, voltage, current, conductor size, and termination method.
4. Confirm cable dimensions. Match the actual cable outer diameter and construction to the compatible sealing configuration.
5. Specify the full mating system. Plugs, receptacles, caps, seals, cable glands, and panel-mount accessories.
6. Check maintenance access. If it is hard to reach after installation, documented compatibility and solid assembly control matter more.
7. Request technical documentation. Drawings, installation instructions, applicable ratings, and test conditions—get them before approving samples, not after.
8. Validate the installed assembly. Test with your actual cable and mounting conditions in the prototype or pre-production where practical.

Our solar connector selection guide walks through the same steps for solar applications specifically.

Mistakes We See Buyers Make

Assuming IP68 is automatically better. It costs more, and it solves nothing if your real risk is UV or vibration rather than water. If a correctly installed IP67 waterproof connector already covers your exposure, paying for IP68 buys margin you don’t need. Match the rating to the failure mode.

Comparing labels instead of test conditions. “IP68 vs IP68” is not a comparison. Ask how each product was tested and in what configuration, then compare the documented conditions to your application.

Ignoring installation quality. A correctly rated connector fails if it’s over-tightened, under-tightened, assembled with the wrong seal, mated incompletely, or paired with an incompatible cable. The installation procedure is part of the buying decision.

Treating the connector as an isolated component. The connector, cable, mating part, panel interface, and accessories work as one ingress-protection system. One weak point sinks the whole assembly.

Questions to Ask Before You Buy Waterproof Connectors

Put these to any supplier before committing:

• Does the stated IP rating apply to the fully assembled and mated connector?
• For IP68, what are the documented immersion depth, duration, pressure, and temperature?
• Which cable outer-diameter range and sealing parts are approved?
• What plug, receptacle, cap, and accessory combinations maintain the stated protection?
• Are installation drawings, assembly instructions, and torque guidance available?
• Which electrical ratings apply to the selected configuration?
• What environmental and mechanical test data exists for the intended use?
• Can samples be tested with our actual cable, enclosure, and installation method?

These questions exist because “looks right in the catalog” is not “validated for your assembly.” That gap is where most field failures come from.

The Bottom Line on IP67 vs. IP68 Waterproof Connectors

Match the rating to the water, not to the marketing. For most outdoor installations, an IP67 waterproof connector is the sensible default: rain, splash, and temporary immersion. IP68 is for prolonged exposure, and only when the manufacturer’s documented test conditions support your application.

And look past the label: cable compatibility, mating components, mounting, assembly quality, and environmental demands. That’s what separates a connector that works for years from one that fails in a season.

Browse our waterproof connector range, or send us your installation details and we will recommend a configuration, test data included.

Ryan

Technical Blogger & Industry Expert

I believe true expertise should not be confined to the workshop. Through my blog, I share industry insights and transform complex industrial standards into clear, practical technical solutions— discussing technology in writing, and delivering quality in production.