DNC-2025 Underwater Ethernet Cat6 M16x1 Long-Thread Bulkhead Connector
DNC-2025 is a professional underwater Ethernet Cat6 bulkhead connector with an extended M16x1 long-thread mounting interface. It is designed for underwater camera housings, marine instruments, OEM enclosures, IP camera systems, monitoring equipment, and other professional underwater Ethernet applications.
The long-thread design provides additional mounting flexibility compared with short-thread M16 connectors. DNC-2025 can be used with compatible M16x1 threaded ports or installed through a compatible non-threaded 16 mm through-hole and secured from inside the housing with the included Security Nut.
The connector also incorporates a dual O-ring sealing design with a Face O-ring and Side O-ring. When enclosure geometry and wall thickness allow both seals to engage correctly, this provides additional sealing redundancy.
Assembled in the USA by Dive And See. DNC-2025 can be supplied as part of a complete underwater Ethernet connection including the bulkhead connector, internal Ethernet pigtail, underwater mating cable, surface termination, and custom cable length.
Key Benefits
- Cat6 Ethernet for professional underwater network applications
- M16x1 Long Thread for increased mounting flexibility
- Compatible with suitable M16x1 threaded ports
- Can be installed through a compatible non-threaded 16 mm through-hole
- Internal Security Nut included for secure through-hole installation
- Dual O-Ring sealing design — Face O-ring + Side O-ring
- Supports Gigabit Ethernet up to 1 Gbps
- T-568B Ethernet wiring
- 23 AWG Ethernet conductors
- RJ45 internal Ethernet interface
- Built-in water block protection
- Marine-grade hard-anodized aluminum construction
- Depth rated up to 100 m / 328 ft
- Custom internal pigtails available
- Compatible underwater mating cables available
- Custom Ethernet cable lengths available up to 100 m
- Prototype and small production quantities available
Why Choose the M16 Long-Thread Design?
The DNC-2025 is designed for installations where additional thread length provides an important mechanical advantage.
Some underwater housings use a standard M16x1 threaded port. Other enclosures, particularly polymer or composite housings, may use a simple non-threaded 16 mm through-hole instead of relying on threads machined directly into the housing wall.
For a non-threaded 16 mm through-hole installation, the DNC-2025 passes through the housing wall and is secured from inside the enclosure with the included Security Nut. The extended M16x1 thread provides sufficient length to pass through the housing wall while maintaining the thread engagement required for the Security Nut.
This mounting method is especially useful for polymer and composite housings because the mechanical retention does not depend entirely on threads cut directly into the enclosure material.
The long-thread configuration can also be useful when enclosure wall thickness requires additional thread length for proper installation.
Dual O-Ring Sealing — Face + Side
The DNC-2025 M16 Long-Thread design incorporates two O-ring sealing locations:
- Face O-ring — seals against the external mounting surface of the housing
- Side O-ring — provides an additional radial sealing point when the housing geometry allows it to engage correctly
When enclosure wall thickness, bore geometry, and mounting dimensions allow both O-rings to engage correctly, the dual O-ring design provides additional sealing redundancy.
The ability to use both sealing locations depends on the specific housing design and wall thickness. Contact Dive And See if you need help confirming mechanical compatibility.
DNC-2025 Long Thread vs. DNC-2071 Short Thread
Both connectors provide professional Cat6 Ethernet connectivity, but they are designed for different mounting configurations.
| Feature | DNC-2025 Long Thread | DNC-2071 Short Thread |
| Thread | M16x1 Long Thread | M16x1 Short Thread |
| M16x1 Threaded Port | Yes, when mechanically compatible | Yes, when mechanically compatible |
| Non-Threaded 16 mm Through-Hole | Yes, when housing geometry permits | Not intended for Security Nut installation |
| Security Nut | Included | Not included / not required for normal short-thread installation |
| O-Ring Design | Face O-ring + Side O-ring | Short-thread mounting configuration |
| Typical Installation | Threaded M16x1 port or 16 mm through-hole with Security Nut | Compatible M16x1 threaded port |
Choose DNC-2025 when the housing uses a non-threaded 16 mm opening, requires an internal Security Nut, has greater wall thickness, or when additional thread engagement is required.
Choose DNC-2071 when the housing already provides a compatible M16x1 threaded port and the additional thread length and Security Nut are not required.
Designed for Complete Underwater Ethernet Integration
DNC-2025 is not simply an outdoor waterproof RJ45 coupler. It is designed for underwater housings and marine equipment where connector geometry, sealing, mounting method, Ethernet performance, water blocking, cable length, and internal clearance all matter.
Dive And See can provide the complete underwater Ethernet connection:
- DNC-2025 bulkhead connector
- Included Security Nut
- Custom internal Ethernet pigtail
- Underwater mating connector
- Underwater-to-surface Ethernet cable
- Underwater-to-underwater Ethernet cable
- Surface RJ45 termination
- Custom cable lengths
- Prototype and OEM configurations
Technical Specifications
| Model | DNC-2025 |
| Product Type | Underwater Ethernet Cat6 Bulkhead Connector |
| Mounting Interface | M16x1 Long Thread / Compatible 16 mm Through-Hole |
| Thread Type | M16x1 Long Thread |
| Installation | Compatible M16x1 threaded port or non-threaded 16 mm through-hole |
| Security Nut | Included — for secure installation through compatible non-threaded 16 mm housing openings |
| Sealing | Dual O-Ring design — Face O-ring + Side O-ring |
| Ethernet Standard | Cat6 Ethernet |
| Data Speed | Up to 1 Gbps Gigabit Ethernet |
| Wiring | T-568B |
| Conductor Gauge | 23 AWG |
| Internal Interface | RJ45 Ethernet connection |
| Contacts | Gold-plated brass contacts / 50-micron gold-plated RJ45 plugs |
| Material | Marine-grade aluminum with hard anodizing |
| Water Protection | Built-in water block |
| Depth Rating | 100 m / 328 ft maximum |
| Custom Pigtail | Available by request |
| Custom Cable Length | Available up to 100 m, subject to Ethernet configuration and performance requirements |
| Assembly | Assembled in the USA by Dive And See |
Engineering Resources
Outline Drawing
Use the outline drawing below to verify mounting dimensions, enclosure wall thickness, internal clearance, and installation geometry before ordering.
3D Integration Model (STEP)
A simplified STEP integration model is available for qualified engineering and OEM projects.
The model is intended for:
- Enclosure layout
- Wall thickness verification
- Mounting clearance
- Security Nut clearance
- Internal connector clearance
- Mating connector clearance
- System integration
Internal construction and proprietary manufacturing features are intentionally omitted.
Request 3D STEP Integration Model
When submitting your request, please include “DNC-2025 STEP Model” in Comments / Questions.
If possible, also include your company name, application, housing material, enclosure wall thickness, whether the mounting hole is threaded or non-threaded, and available internal clearance.
Product Images
Compatible Dive And See Ethernet Cables
- DNC-1020 — 100 ft / 30 m underwater Cat6 Ethernet cable
- DNC-1044 — 300 ft / approximately 90 m underwater Cat6 Ethernet cable
- DNC-1101 — Underwater-to-underwater Cat6 Ethernet cable with waterproof male connectors
- DNC-1102 — 1 m underwater Ethernet Cat6 cable with waterproof connectors
Water Block Protection
DNC-2025 includes a built-in water block designed to help limit water migration through the connector assembly if the external cable or mating connector is damaged.
The water-block design can also help maintain housing vacuum in compatible vacuum-tested underwater systems.
Custom Engineering Options
Dive And See can modify the DNC-2025 configuration for engineering, prototype, and OEM applications.
- Custom internal pigtail length
- Custom internal termination
- Custom underwater cable length
- Underwater-to-surface Ethernet assemblies
- Underwater-to-underwater Ethernet assemblies
- Custom connector combinations
- Prototype quantities
- Small production runs
Tell us what you need to connect. We can help build the complete underwater Ethernet connection between your equipment and the surface.
Assembly Lead Time
Standard Lead Time: Typically 6–8 business days.
Expedited 3-Day Assembly: Available for +15%, subject to production availability.
Contact Dive And See before ordering if you require expedited assembly.
Applications
- Underwater IP camera systems
- PoE underwater cameras
- Remote camera control
- Marine monitoring systems
- Scientific and research instrumentation
- Underwater inspection systems
- OEM underwater electronics
- Custom marine enclosures
- Polymer and composite underwater housings
- Non-threaded 16 mm housing installations
- M16x1 threaded housing installations
- Gigabit Ethernet communication between underwater equipment and the surface
Additional Product Image
Frequently Asked Questions
What is the DNC-2025 used for?
DNC-2025 provides a sealed Cat6 Ethernet connection through an underwater housing wall for IP cameras, marine instruments, remote camera control, research equipment, inspection systems, and other professional underwater electronics.
Why does the DNC-2025 use a long M16x1 thread?
The extended thread provides sufficient length to pass through the enclosure wall and engage the included internal Security Nut. This is particularly useful for housings that use a non-threaded 16 mm through-hole instead of relying on an M16x1 thread machined directly into the housing wall.
Can DNC-2025 be installed in a non-threaded 16 mm hole?
Yes, when the housing geometry and wall thickness are compatible. DNC-2025 can pass through a suitable non-threaded 16 mm opening and be secured from inside the enclosure using the included Security Nut.
Is the Security Nut included?
Yes. The DNC-2025 M16 Long-Thread bulkhead connector includes an internal Security Nut. This allows the connector to be securely installed through a compatible non-threaded 16 mm housing opening without relying on threads cut into the housing wall.
Why would a non-threaded through-hole installation be used?
A through-hole with an internal Security Nut can be especially useful for polymer or composite housings where the designer prefers not to rely on threads machined directly into the enclosure wall. The mechanical retention is provided by the connector body and internal Security Nut.
Does the DNC-2025 have two O-rings?
Yes. The M16 Long-Thread DNC-2025 uses a Face O-ring and Side O-ring. When enclosure wall thickness and mounting geometry allow both seals to engage correctly, the dual O-ring design provides additional sealing redundancy.
Will both O-rings always be used?
Not necessarily. Correct engagement of both sealing locations depends on the enclosure geometry, wall thickness, bore dimensions, and installation configuration. Verify the installation dimensions before ordering.
What is the difference between DNC-2025 and DNC-2071?
DNC-2025 uses an extended M16x1 long thread, includes a Security Nut, and is designed for applications requiring additional thread length or installation through a compatible non-threaded 16 mm opening. DNC-2071 uses a shorter M16x1 thread and is generally intended for compatible threaded housing ports where an internal Security Nut is not required.
Does DNC-2025 support Gigabit Ethernet?
Yes. DNC-2025 supports Ethernet data transmission up to 1 Gbps.
What is the maximum depth rating?
DNC-2025 is rated for underwater applications up to 100 m / 328 ft.
Does the connector include a water block?
Yes. DNC-2025 includes a built-in water block designed to help reduce water migration through the connector assembly if the external cable or mating connector is damaged.
Is a STEP model available?
Yes. A simplified DNC-2025 STEP integration model is available by request for qualified engineering and OEM projects. The model is intended for enclosure layout, wall thickness verification, Security Nut clearance, mounting clearance, and system integration. Internal construction and proprietary manufacturing details are omitted.
Can I order a custom internal Ethernet pigtail?
Yes. Custom internal pigtail lengths and termination configurations are available by request.
Can Dive And See provide the mating underwater cable?
Yes. Dive And See offers compatible underwater Ethernet cables for underwater-to-surface and underwater-to-underwater applications.
Can I order a custom cable length?
Yes. Custom underwater Ethernet cable lengths are available up to 100 m, subject to Ethernet configuration and performance requirements.
How long does assembly take?
Standard assembly is typically 6–8 business days. Expedited 3-day assembly may be available for an additional 15%, subject to production availability.
Need Help With Integration?
If you are integrating DNC-2025 into a custom housing or underwater device, send us:
- Housing material
- Mounting-hole diameter
- Whether the port is threaded or non-threaded
- Enclosure wall thickness
- Available internal clearance
- Required underwater cable length
- Required surface termination
We can help determine whether the DNC-2025 M16 Long Thread or DNC-2071 M16 Short Thread is the better configuration for your application.
