The Harken 2639 40 mm Carbo Double Swivel Block with Becket is a lightweight, high-performance sailing block designed for smooth, efficient line handling on cruising and racing sailboats. Featuring two 40 mm Carbo sheaves, a full swivel head, and an integrated becket, this versatile block provides excellent load distribution, reduced friction, and reliable performance for demanding running rigging applications.

Constructed with high-strength fiber-reinforced composite side plates and low-friction ball bearings, the Harken 2639 delivers exceptional strength while minimizing weight. Its corrosion-resistant construction ensures dependable operation in both freshwater and saltwater environments.

Ideal for mainsheets, boom vangs, control lines, travelers, and other sail handling systems, the Harken 2639 is trusted by sailors worldwide for its durability, smooth operation, and maintenance-free performance.

Shiptech Marine Ltd proudly supplies genuine Harken sailing hardware, marine rigging equipment, and premium boating accessories across Canada.

Key Features

• Genuine Harken® product

• Model: 2639

• 40 mm Carbo Double Block

• Integrated becket

• Full swivel head

• Low-friction ball bearing system

• High-strength composite side plates

• Lightweight and corrosion-resistant

• Smooth, efficient line handling

• Ideal for cruising and racing sailboats

Specifications

• Brand: Harken

• Manufacturer Part Number: 2639

• Product Type: Carbo Double Swivel Block with Becket

• Sheave Diameter: 40 mm (1-9/16")

• Sheaves: Double

• Head: Swivel

• Becket: Yes

• Bearing Type: Ball Bearing

• Construction: Fiber-reinforced composite with stainless steel components

• Applications: Mainsheets, boom vangs, travelers, control lines, and running rigging

Weight

Approximate Weight: 3.7 oz (0.23 lb / approximately 105 g)