Antal Mainsheet Block with Cam Cleat for E7/75

The Antal Mainsheet Block with Cam Cleat for E7/75 is the lower mainsheet block used in Antal’s 7:1 tackle system for yachts up to approximately 40 feet. Designed to deliver greater trimming power and control, this unit forms the base of a high-load, smooth-operating tackle configuration, ideal for performance cruising or larger mainsail setups.

It features a 75 mm primary sheave to manage the main load path, with a compact triple 60 mm block mounted above to support the remaining reeving. A cheek-mounted cam cleat provides convenient line capture and release. This block is sold individually, making it perfect for retrofit installations where customers are reusing or upgrading existing boom-end hardware.

Key Features

• Designed for 7:1 Systems
  Offers increased mechanical advantage in a compact form—well suited to heavier sail plans and higher loads.
• Efficient Sheave Layout
  • 1 × 75 mm sheave (load-bearing base)
  • 3 × 60 mm sheaves mounted above in triple configuration
• Integrated Cam Cleat
  Built-in cleat on the lower block provides immediate control of the mainsheet, ideal for single- or short-handed operation.
• Smooth, Low-Friction Operation
  All sheaves use dual ball bearings to ensure effortless handling under load.
• High-Strength Construction
  Made from anodised aluminium and stainless steel for long-lasting performance in harsh marine environments.

Specifications

• Sheave Sizes: 1 × 75 mm (lower), 3 × 60 mm (upper)
• Cam Cleat: Integrated
• Becket: Not required on this block (system starts at boom)
• Rope Compatibility: Up to Ø12 mm
• Safe Working Load (SWL): 1000 kg
• Recommended Boat Size: Up to 40 ft (12 m)

Boom-End Block Requirement

To complete the 7:1 configuration using this lower block, pair it with the following at the boom end:

• 1 × Double block with becket (60 mm sheaves)
• 1 × Single block (60 mm sheave)

The becket on the boom-mounted double block anchors the sheet, while the single block completes the upper reeving for full 7:1 mechanical advantage.

This Antal lower mainsheet block provides exceptional handling and durability for sailors upgrading to a high-efficiency 7:1 system, offering reliable performance and smooth sail control in a robust, modular package.