Blue Sea CableClam 625 – Waterproof & Reliable Pass-Thru

Blue Sea CableClam 625″ Max Cable Dia 0.31in for Boats & Marine Engines

Introduction

The Blue Sea CableClam 625 Max Cable Dia 0.31in is a high-performance, watertight cable pass-through designed to protect your onboard electrical systems. Specially engineered for marine environments, it offers a dependable seal that maintains the integrity of your vessel’s hull and deck. Whether you’re running antennas, solar panels, or electrical instruments, this accessory is essential for ensuring long-lasting, corrosion-resistant performance in harsh conditions.

Every boat owner and marine engineer understands the critical role of sealing cable entries to prevent moisture, corrosion, and leaks. The Blue Sea CableClam 625 is a robust, compact solution to this challenge. Its UV-stabilized plastic cap, low-profile design, and stainless steel fasteners make it perfect for modern marine builds and refits.

Overview / What Is Blue Sea CableClam 625

The Blue Sea CableClam 625 is a cable-sealing device that allows for a clean and secure pass-through of cables up to 0.31 inches in diameter. Ideal for marine and boating applications, it maintains watertight integrity around antenna wires, power leads, and instrument cables. Built by Blue Sea Systems, a leader in marine electrical components, this CableClam helps keep your vessel safe, functional, and neat.

Designed for quick installation and lasting durability, it uses a pre-drilled rubber gland system that creates a tight seal around the cable. Its low-profile design ensures minimal trip hazard on deck and excellent aesthetics for professional marine installations. It’s most commonly used for GPS antennas, VHF radio cables, solar panel wiring, and LED light connections.

Key Features of Blue Sea CableClam 625

• Waterproof Performance: IP67-rated sealing against moisture and spray
• Maximum Cable Diameter: Accepts cables up to 0.31 inches (7.87mm)
• Low Profile Design: Flush mount keeps deck areas clean and unobstructed
• Material Quality: UV-resistant plastic cap with stainless steel fasteners
• Easy Installation: Includes rubber gland with drill guide

With these features, the Blue Sea CableClam 625 has become a trusted choice among DIY boat builders and professional marine electricians alike.

How to Install Blue Sea CableClam 625 on Your Boat

Installing the Blue Sea CableClam 625 is straightforward and doesn’t require specialized tools. Here’s how to do it:

1. Determine the location where the cable will pass through the deck or bulkhead.
2. Drill the pilot hole using the included template or matching size for the rubber gland.
3. Pass the cable through the gland, then install the gland into the CableClam body.
4. Use the stainless screws provided to mount the CableClam securely onto the surface.
5. Seal the perimeter using a marine-grade sealant if needed for additional waterproofing.

Ensure cables are not under tension and that the seal is evenly compressed to maintain watertight integrity. This simple yet powerful accessory helps avoid complicated junction boxes or sealing tapes that often fail over time.

Why the Blue Sea CableClam 625 is a Must-Have for Marine Electrical Systems

Marine environments are unforgiving, especially when it comes to water ingress and cable corrosion. The Blue Sea CableClam 625 is essential for any boater who needs to route electrical or communication cables through decks or bulkheads without compromising safety or performance.

Unlike cheaper alternatives, it is designed with high-grade materials that withstand UV exposure, saltwater, and high humidity. It offers a professional finish while significantly reducing the chances of future repairs or water damage. This level of reliability and ease of use makes it a favorite among boatbuilders, refitters, and marine electricians.

Blue Sea CableClam 625 Compatibility and Use Cases

While the CableClam 625 is ideal for marine engines and boats, it’s also widely used in other demanding applications, including RVs, solar energy installations, and off-grid systems. It ensures safe cable routing for antennas, GPS modules, radar domes, and more.

Some popular use cases include:

• Running GPS and VHF cables from cockpit to electronics bay
• Installing solar wiring on sailing yachts and catamarans
• Routing LED lighting cables through aluminum or fiberglass decks
• Creating safe connections for outdoor security cameras or sensors

This flexibility, combined with easy installation, makes the Blue Sea CableClam 625 one of the best electrical sealing solutions on the market today.

Maintenance Tips

To ensure long-lasting performance of the Blue Sea CableClam 625, follow these routine maintenance tips:

• Inspect Seals: Check the rubber gland annually for cracks or wear. Replace if deteriorated.
• Check Screws: Ensure the stainless steel screws are tight and corrosion-free.
• Sealant Touch-Up: If a sealant was applied during installation, check for any peeling or gaps.

By keeping the CableClam in optimal condition, you protect not just the cable but also your electrical components, electronics, and safety systems from the risk of water damage.

Expert Advice and Pro Recommendations

Marine electricians and boat builders highly recommend the Blue Sea CableClam 625 because of its consistent performance and simple design. Experts suggest using marine-grade sealants during installation for maximum effectiveness. Always drill carefully and match the gland size to the cable diameter to maintain a secure fit.

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Detailed FAQ Section

What cable types work best with the Blue Sea CableClam 625?

The Blue Sea CableClam 625 is compatible with a wide variety of cables, including coaxial cables for VHF antennas, DC power wires, Ethernet cables, and solar panel wiring. The critical factor is that the cable’s outer diameter does not exceed 0.31 inches (7.87mm). For oversized cables, Blue Sea offers larger CableClam models. The rubber gland can be custom-drilled to accommodate the exact shape and diameter of the cable, ensuring a snug and watertight fit.

How to maintain the Blue Sea CableClam 625 for long-term use?

Maintaining the Blue Sea CableClam 625 involves periodic inspections and basic cleaning. Remove any salt buildup with fresh water and a soft cloth. Check for degradation in the rubber seal and confirm that mounting screws remain tight. If you notice signs of corrosion or sealant cracking, take corrective action immediately. These small steps can prevent larger issues like water ingress and electrical failure in your boat’s systems.

Is it necessary to use sealant when installing the CableClam 625?

While the Blue Sea CableClam 625 offers a tight seal through its compression gland system, applying marine-grade sealant is highly recommended—especially in areas prone to heavy water contact. Products like 3M 4200 or Sikaflex are commonly used for sealing the base to the deck or bulkhead. This step enhances waterproof performance and ensures protection even under extreme weather conditions or heavy spray zones.

What are the differences between the CableClam 625 and other Blue Sea models?

The Blue Sea CableClam family includes multiple models that accommodate different cable diameters. The CableClam 625 is suited for cables up to 0.31 inches, making it perfect for VHF, GPS, and LED lighting installations. Larger models like CableClam 1.00 or 1.25 accept thicker power cables and multi-core harnesses. Choosing the right size ensures a proper seal and reduces the risk of leaks. Consider your application before selecting a model.

What is the durability and lifespan of the Blue Sea CableClam 625?

Engineered for harsh marine conditions, the Blue Sea CableClam 625 has a service life of 5–10 years or more when properly installed and maintained. Its UV-resistant plastic and corrosion-proof stainless steel hardware ensure it remains structurally sound in salty, sunny, and wet environments. Regular maintenance can further extend its life. Unlike cheaper pass-throughs that crack or leak over time, the Blue Sea CableClam offers a dependable, long-term solution.

Conclusion

The Blue Sea CableClam 625 Max Cable Dia 0.31in is a compact, powerful solution that addresses one of the most common marine electrical challenges—safely routing cables through decks and bulkheads. It combines excellent design with long-lasting materials to ensure waterproof integrity and professional finish. Whether you’re installing new electronics or upgrading old systems, this accessory is indispensable for keeping your boat watertight, organized, and safe.

Choose reliability, safety, and performance—choose Blue Sea CableClam 625.

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