Seachoice Double Braid Nylon Rope Spool, 3/8 in. x 600 ft, Black

600 Feet of Double Braid Nylon. The Dock Line Standard.

The Seachoice 3/8" x 600 Ft. Double Braid Nylon Rope Spool is the go-to bulk line for boaters, marina operators, and anyone who needs high-quality nylon rope in quantity. Double braid construction — a braided core inside a braided cover — delivers superior strength, minimal stretch under steady load, and excellent resistance to kinking compared to twisted rope. It’s the construction standard for premium dock lines, anchor lines, and mooring lines.

High-grade nylon provides the elasticity needed to absorb sudden shock loads — the kind that occur when a vessel surges against its dock lines in wake or wind. That shock absorption is what separates nylon from polypropylene for dock and mooring applications, and why nylon double braid is the preferred choice for lines that need to protect both the vessel and the dock hardware.

Key Features

• Double Braid Construction — Braided core inside a braided cover for superior strength, flexibility, and kink resistance vs. twisted rope
• High-Grade Nylon — Excellent shock load absorption; stretches under load to protect vessel and dock hardware
• Long-Wearing — Durable construction resists abrasion and maintains strength over extended use
• Kink Resistant — Double braid lay resists kinking and hockling for clean coiling and deployment
• Versatile Application — Suitable for dock lines, anchor lines, mooring lines, and general marine rigging
• 600-Foot Bulk Spool — Cut to any length needed; enough for a full season’s worth of dock lines or a complete anchor rode
• Black — Clean, professional appearance that holds color well over time

Specifications

• Brand: Seachoice
• Construction: Double Braid
• Material: High-Grade Nylon
• Diameter: 3/8" (9.5mm)
• Length: 600 ft (182.9m)
• Color: Black
• Weight: 11.6 kg (25.6 lb)
• Part Number: 50-47090

Whether you’re stocking a marina, outfitting a fleet, or simply want a full spool of premium dock line to cut to your exact lengths, the Seachoice 3/8" double braid nylon spool delivers the quality and quantity to get the job done right.

⚓ Parts Desk Insight

• Nylon vs. polypropylene — choose based on application: Nylon stretches and absorbs shock, making it ideal for dock lines and anchor rodes where surge loads are a concern. Polypropylene floats but has less elasticity and lower UV resistance. For dock lines and mooring lines, nylon double braid is the correct choice.
• Double braid vs. twisted — why it matters: Double braid is stronger, more kink-resistant, and easier to handle than twisted (3-strand) rope of the same diameter. It’s also easier to splice with the right tools. For dock lines that get coiled and deployed repeatedly, double braid holds up significantly better over time.
• Bulk spool — cut and finish ends properly: This is a 600-foot spool, not pre-cut dock lines. Customers should heat-seal, whip, or splice the cut ends to prevent unraveling. Nylon melts cleanly with a lighter or heat gun for a quick field finish.
• 3/8" is appropriate for most mid-size vessels: Suitable for dock lines on vessels in the 25–40 foot range. For larger vessels or high-load applications, step up to 1/2" or larger. For smaller boats, 5/16" or 1/4" may be more appropriate.