IP Ratings for Machine Vision Lenses: What IP67, IP68, and IP69K Really Mean
How IEC 60529 and ISO 20653 define dust and water protection, how a sealed M12 lens barrel achieves it, and which Commonlands SKUs actually carry a verified rating.
IP ratings for machine vision lenses follow IEC 60529. The first digit covers solids: 6 means dust-tight. The second digit covers liquids: 7 means immersion to 1 meter for 30 minutes, and 8 means immersion beyond those conditions at a depth and duration the manufacturer specifies. IP69K, tested under the separate ISO 20653 standard, means the lens survives a high-pressure, high-temperature washdown jet.
A sealed M12 lens gets its rating from O-rings at the thread interface and sealed internal barrel joints, not from the glass itself. The rating applies to a specific mechanical variant of a lens, not the whole SKU family. The Commonlands CIL034 M12A is IP67, but the CIL034 M12B has no ingress rating at all.
What Do the IP Rating Digits Actually Mean?
An IP code is two digits after the letters "IP," defined in IEC 60529, Degrees of Protection Provided by Enclosures. The first digit, 0 through 6, rates protection against solids: a 6 means dust-tight.
The second digit, 0 through 9, rates protection against liquids. A 7 means immersion in still water to 1 meter for 30 minutes. An 8 means immersion beyond that, at a depth and duration the manufacturer specifies. IP69K is defined separately, in ISO 20653, not IEC 60529: it sprays water at roughly 80°C and 80 to 100 bar from 100 to 150mm, at several angles. That is a directional high-pressure load, not slow immersion.
Because the tests load the seals differently, the two ratings are not points on one scale. An IP67 mark does not certify performance against a high-pressure jet, and an IP69K mark does not imply the 30-minute immersion test was run. Unless the datasheet shows both, assume only the one listed. Dual-rated IP67/IP69K parts, common in automotive, carry both marks for that reason.
Commonlands seals select M12 lens variants to IP67 and IP69K. The table below maps each ingress class to the deployment conditions it covers.
| Rating | First digit (solids) | Second digit (liquids) | Typical application |
|---|---|---|---|
| IP65 | Dust-tight | Water jets from a 6.3mm nozzle, any direction | Indoor washdown areas, light splash |
| IP67 | Dust-tight | Immersion to 1m depth, 30 minutes | Outdoor cameras, rain, agricultural splash, delivery robots |
| IP68 | Dust-tight | Immersion beyond IPX7 conditions, manufacturer-specified depth and duration | Underwater inspection, submersible housings |
| IP69K | Dust-tight | High-pressure, high-temperature jet (ISO 20653, ~80°C, 80–100 bar, 100–150mm) | Automotive underbody/ADAS, food and beverage washdown, pharmaceutical washdown areas |
IP67 vs IP69K: Which One Does Your Application Need?
The decision comes down to one question: will the camera ever be pressure-washed or steam-cleaned as part of routine operation? If yes, specify IP69K. If the exposure is limited to rain, splash, and condensation, IP67 is typically sufficient.
IP67 Is Typically Sufficient For
- Outdoor security and monitoring cameras exposed to rain and condensation cycling
- Agricultural monitoring systems subject to irrigation spray and field humidity
- Delivery robots, outdoor mobile robots, and drone camera payloads
- General outdoor industrial installations with rain or occasional splash, not directed pressure
IP69K Is Required For
- Automotive ADAS cameras in wheel-well, underbody, or engine-bay positions exposed to road spray and commercial wash cycles (see lenses for autonomous vehicles)
- Food and beverage production lines under CIP (clean-in-place) or manual high-pressure washdown
- Pharmaceutical washdown areas (steam sterilization/autoclave at 121–134°C is a separate qualification that IP69K does not certify)
- Mining and construction equipment cleaned with high-pressure water
Some aggressive wash systems approach or exceed the 80°C and 80–100 bar conditions of the IP69K test. If your wash cycle is unusually aggressive, confirm the actual pressure and temperature against ISO 20653 before assuming IP69K covers it, and talk to Commonlands engineering.
Specifying above the requirement has a real cost. An IP69K seal stack is more involved than the IP67 or unsealed variant in the same family, so it adds cost and lead time with no benefit if the camera only ever sees rain. The reverse error is worse: an IP67 seal hit by a directional 80°C jet at close range can fail where it would hold up fine against rain.
Take margin within the exposure class you are actually in. Do not jump test classes to get it. IP69K is not IP67 with extra margin, it is a separate test for a separate failure mode.
How Is an M12 Lens Barrel Sealed to Reach an IP Rating?
An M12 lens has three predictable entry points for dust and moisture in an unsealed design: the M12×0.5 thread interface where the barrel screws into the camera mount, the joints between internal barrel sections, and the retaining ring that holds the front element. A sealed variant closes each path mechanically rather than relying on the optics.
- Thread interface O-ring. A rubber O-ring at the M12 thread, compressed when the lens is torqued into the mount, blocks the threads, the single largest gap in an unsealed design.
- Sealed internal barrel joints. Where the barrel is assembled from multiple machined sections, adhesive or press-fit seals close the seams so moisture cannot migrate between elements internally.
- Bonded or sealed front element. Rather than a removable retaining ring with a dry fit, the front surface is bonded or gasket-sealed, closing the most exposed optical surface against direct water contact.
- Hydrophobic front coating (optional). A hydrophobic coating makes water bead and roll off the front element, reducing contamination and improving contrast in rain. It is a surface treatment, not an ingress seal, and does nothing for the thread or barrel joints.
Two mechanical facts follow. First, sealing is a manufacturing-time decision baked into a specific mechanical variant, which is why the same base SKU can ship in a sealed and an unsealed version. See why the same SKU can carry different ratings. Second, the seal is permanent once assembled: there is no field upgrade from unsealed to IP67, or from IP67 to IP69K, on an existing unit.
The step from IP67 to IP69K is not a stronger version of the same O-ring. A close-range directional jet can exploit a gap that slow immersion never loads hard enough to reveal. IP69K barrels use tighter O-ring compression and added sealing at the barrel-to-cap interface. A Commonlands automotive-grade variant such as the CIL190 adds an all-glass formula in an aluminum barrel rather than unfilled-plastic components.
Metal is favored here less for thermal expansion than for creep: an unfilled polymer barrel deforms slowly under sustained O-ring load at washdown temperature, relaxing the seal squeeze. Confirm barrel material and washdown qualification against the datasheet.
Why Does the Same SKU Sometimes Carry Different IP Ratings?
Commonlands lists mechanical variants under one base part number because the optical formula, focal length, and field of view are identical across variants; only the barrel construction differs. The variant suffix, not the base SKU, determines the ingress rating.
The clearest example is the CIL034, a 3.25mm wide-angle M12 lens. The M12A variant is IP67 sealed with a thread-interface O-ring. The M12B variant has no ingress rating. Both share the same optics: 3.25mm EFL, 102° field, 8.0mm image circle. Only the barrel differs. "CIL034" without the variant suffix does not tell a BOM reviewer whether the part is sealed.
| SKU | Variant | Ingress rating |
|---|---|---|
| CIL034 | M12A | IP67 |
| CIL034 | M12B | No ingress rating |
| CIL059 | M12A | No ingress rating |
| CIL059 | M12B | IP67 |
Always confirm the full part number, including the variant suffix, against the current product page or an engineering quote before assuming a unit is sealed. CIL034-F2.7-M12A660 is the sealed IP67 build; CIL034-F2.7-M12BNIR is the unsealed M12B of the same optics.
Does a Sealed Lens Replace an External Camera Housing?
Only if the rest of the camera is sealed too. A sealed lens barrel closes off the optical path itself, but the camera board, connectors, and enclosure behind the lens are separate mechanical systems with their own ingress paths. An IP-rated lens on an unsealed camera body still leaves the system exposed at the board and connector level.
Two integration patterns are common. In the first, a sealed lens threads into a camera module whose board and connectors are also sealed to a matching rating, typical of compact automotive and robotics modules built as one unit. The sealed lens then removes the need for a separate housing and its protective window, along with the reflection loss that window adds.
In the second, an existing unsealed camera is retrofitted into an external IP-rated enclosure with a window in front of a standard lens. This works with any camera but adds weight, bulk, and a window to maintain. It is often the only option late in a project or when adapting an off-the-shelf camera that was never sealed. Specified early, a sealed lens against a sealed board is usually the lower total-system-cost path.
The table below weighs a sealed Commonlands M12 lens in a sealed module against a standard lens behind a housing window.
| Factor | Sealed lens + sealed camera module | Standard lens + external housing |
|---|---|---|
| Extra optical surfaces | None | Protective window, ~4% reflection per surface uncoated (~8% total); <1% per surface AR-coated |
| Added weight | Lens weight only | Added enclosure weight, which varies with size, material, and window |
| Retrofit flexibility | Low (specified at design time) | High (fits most existing cameras) |
| IP upgrade after purchase | Not possible | Replace the enclosure |
| Window maintenance | Not applicable | Required (fogging, scratching, cleaning access) |
For background on M12 construction and mount standards, see what is an M12 lens. For environmental design beyond ingress (thermal stability, vibration resistance, and coatings), see ruggedized machine vision lenses. That page covers what this article does not.
Top IP67 and IP69K M12 Lenses
Commonlands sealed M12 lenses fall into two ingress classes. IP69K barrels survive high-pressure, high-temperature washdown for automotive and food-line cameras. IP67 barrels handle outdoor rain, irrigation splash, and condensation. The five lenses below each carry a rating tied to a specific mechanical variant, not to the base SKU.
Every rating below was checked against live Commonlands product data on 2026-07-25 and listed by mechanical variant, because the base SKU alone does not determine sealing. Ranking within each class reflects deployment fit, not optical quality. Confirm the full part number, including the variant suffix, before you order.
| Rank | Lens (variant) | EFL and aperture | Verified IP rating | Best-fit application | Product page |
|---|---|---|---|---|---|
| 1 | CIL190 M12A | 19mm, F/1.6 | IP69K | Narrow 20° field for ADAS and robotics washdown positions; all-glass, all-metal barrel | CIL190 19mm IP69K M12 lens |
| 2 | CIL384 M12A | 3.34mm, F/1.6 | IP69K | Fast wide-angle automotive front and surround cameras; 116° field | CIL384 automotive IP69K M12 lens |
| 3 | CIL034 M12A | 3.25mm, F/2.7 | IP67 | Outdoor wide-angle where rain and splash, not directed pressure, are the exposure; 102° field | CIL034 IP67 low-distortion M12 lens |
| 4 | CIL215 M12A | 1.5mm, F/2.0 | IP67 | 190° IR-corrected fisheye for day and night outdoor coverage | CIL215 190° IR-corrected fisheye M12 lens |
| 5 | CIL059 M12B | 5.9mm, F/1.7 | IP67 | Standard 76° field for outdoor and agricultural cameras; fast aperture for low light | CIL059 6mm IP67 M12 lens |
Sealing is per-SKU and per-variant. None of these ratings extend to other Commonlands lenses or to a different variant of the same lens, and an IP rating on the barrel does not seal the connector or cable exit behind it. To size the field of view against your sensor, use the field of view calculator.
Frequently Asked Questions
What does IP67 mean for a machine vision lens?
Under IEC 60529, the first digit of IP67 means the lens barrel is dust-tight. The second digit means it can withstand immersion in still water to 1 meter depth for up to 30 minutes. For a machine vision lens this covers outdoor deployment, rain, irrigation splash, and incidental liquid contact, but not continuous submersion or high-pressure washdown.
What is the difference between IP67 and IP69K for lenses?
IP67 is tested under IEC 60529 as immersion to 1 meter for 30 minutes, a slow hydrostatic load. IP69K is tested under ISO 20653 as a high-pressure, high-temperature water jet at roughly 80°C and 80 to 100 bar from close range. A lens can pass one test and fail the other because the seals experience a completely different type of mechanical stress in each case.
Does the IP67 rating on a CIL034 apply to every version of that lens?
No. The Commonlands CIL034 ships in two mechanical variants. The M12A variant is IP67 sealed with an O-ring at the thread interface. The M12B variant carries no ingress rating at all. Always check the specific part number suffix, not just the base SKU, before specifying a sealed lens.
How is an M12 lens barrel sealed to reach an IP rating?
Sealed M12 lenses use an O-ring at the M12 thread interface between the barrel and the camera mount, adhesive or press-fit seals between internal barrel sections, and in many designs a bonded or sealed front element rather than a removable retaining ring. Some variants add a hydrophobic coating on the front surface to shed water, which reduces contamination but is not itself an ingress seal.
Do I need IP67 or IP69K for my application?
IP67 is typically sufficient for outdoor cameras, agricultural monitoring, and delivery robots exposed to rain and occasional splash. IP69K, tested under ISO 20653, is needed when the camera will be exposed to high-pressure or high-temperature washdown, such as automotive underbody positions or food and beverage CIP cleaning cycles.
Does a sealed lens eliminate the need for a camera housing?
A sealed lens protects the barrel itself. If the camera body and sensor board are also sealed to a matching or higher IP rating, a separate external housing is often unnecessary. If the camera body is not sealed, it still needs protection independently of the lens rating.
Need Help Specifying the Right Ingress Rating?
Send Commonlands engineering the deployment environment (rain exposure, washdown cycles, and temperature range) and get a verified sealed lens recommendation with the correct mechanical variant.