Blue Sea Systems CableCap Stud Insulator, PVC, Single Stud

Overview

The Blue Sea Systems CableCap is a PVC stud insulator for covering a single exposed termination stud on boat electrical equipment. It is made for stud-type connectors on alternators, starters, windlasses, and other high-amperage termination points where an uncovered live post can be a problem in tight electrical spaces.

This CableCap range covers multiple stud and cable sizes, with red and black versions available for installations that use color separation around DC positive and negative circuits. Across the family, the listed cable sizes run from 18 AWG through 4/0 AWG, so the correct variant should be matched to the terminal, cable size, and stud diameter being protected.

Key features

• Insulates a single stud-type connector on alternators, starters, windlasses, and other high-amperage devices.
• PVC construction gives the cap a practical insulating body for marine DC electrical installations.
• Red and black color options support clear visual separation in electrical lockers, battery compartments, and engine spaces.
• Variant range covers cable sizes from 18 AWG to 4/0 AWG, depending on the selected cap.
• Stud size options include 0.47 to 0.13, 0.70 to 0.30, 0.50, and 1.25 to 0.70, allowing the cap to be matched to the termination point rather than forced onto the wrong hardware.
• Useful for reducing accidental contact with exposed high-current studs in crowded marine electrical areas.

Variants

The CableCap range varies by color and by the stud size range it is meant to cover. Red and black versions are available across the common size groups, which helps keep the installation easy to identify after panels, covers, or battery cables are reinstalled.

The variants also differ by cable size coverage, with smaller caps for 18 to 10 AWG and 8 to 4 AWG wiring, mid-size caps for 2 to 2/0 AWG wiring, and larger caps for 3/0 to 4/0 AWG wiring. Match the cap to the actual stud and cable size on the alternator, starter, windlass, bus connection, or other high-current termination before installation.

Installation and fit

Check the terminal stack before fitting the cap, especially where a lug, washer, nut, and additional hardware share the same stud. The cap should cover the exposed conductor area without putting strain on the cable or interfering with the tightened connection.

On boats, these caps are most often used in spaces where tools, loose gear, battery boxes, or nearby metalwork could contact a live stud. They are a simple fit-and-protect item for DC refits, battery cable upgrades, windlass wiring, engine-room service work, and cleanup of exposed high-current posts.

Compatibility and use on board

This product is a good match for boat owners, installers, and service technicians working around high-current DC terminations that need a cleaner and safer insulated finish. It is not a network connector or a voltage-specific electronic component, so fit is determined by the physical stud, terminal, and cable size rather than by NMEA compatibility or 12V versus 24V system voltage.

Shipping
We ship worldwide from the United States. Rates are calculated at checkout based on destination and package weight. Some items include free shipping, which will show automatically. Not every product is eligible for international shipping; checkout will confirm eligibility. We do not ship to PO Boxes except through USPS, and not all packages qualify.

Processing and dispatch
Most orders are verified, packed, and handed to the carrier within 1 to 2 business days. Some products may need extra handling time or ship directly from the manufacturer. For certain international orders, inventory transfers between warehouses may add time. If any delay is expected, we will let you know the dispatch date.

Delivery and tracking
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Duties, taxes, and support
International customers are responsible for any customs duties, taxes, and fees charged by the destination country. If these charges are refused and a shipment returns to us, the carrier’s return cost and any re-entry customs fees will be deducted from the refund. If your order is late or you need help, contact cs@qualityboatparts.com and we will assist you.

Quality Boat Parts is a reseller. Many items include a manufacturer’s warranty, and all warranty service is handled directly by the manufacturer. We do not manage or administer warranty claims on behalf of customers.

Warranty terms, coverage, and duration are set by each manufacturer. Issues involving defects, repairs, or replacements must be addressed with the manufacturer’s support team. When available, the warranty period is listed on the product page. If it is not shown, contact us or the manufacturer for details before purchasing.

To start a claim, the customer must contact the manufacturer and follow their process. Keep your proof of purchase and original packaging, and register the product if the manufacturer requires it, as these are often needed for warranty service.

We are happy to help you find the right contact or documentation, but we cannot decide outcomes or intervene in claim resolutions. For guidance, email cs@qualityboatparts.com.