100mm Aluminum Standup Block — Becket

Harken 100mm Aluminum Standup Block — Becket

The Harken Black Magic Air 100mm Aluminum Standup Block with Becket (Part No. 3211) is a premier choice for Big Boat performance racers and offshore cruisers who demand reliable, free-running blocks on their most heavily used sail controls. Part of the acclaimed Black Magic Air series, this block combines lightweight aluminum construction with advanced engineering to deliver exceptional load-handling capability and minimal friction in demanding conditions.

Sideplates and sheaves are Hard Lube-anodized to provide maximum UV protection and a consistently smooth bearing surface. A precision center cage keeps Torlon® roller bearings separated and perfectly parallel, dramatically reducing friction and wear under sustained, high-load cycling. The result is a block that runs freely and efficiently, even in high-load sail control applications such as mainsheet, runners, and other systems that see constant action.

The standup configuration allows the block to orient itself upright for smooth line entry, while the integrated becket provides an additional attachment point for multi-purchase systems. The block includes a padeye and is designed to use the hole spacing and base dimensions of the 648 padeye for straightforward deck installation.

Key Features

• Part of the Black Magic Air series — the top choice for Big Boat performance racers and cruisers
• Lightweight aluminum construction for performance-oriented applications
• Sideplates and sheaves Hard Lube-anodized for maximum UV protection and smooth surface
• Center cage keeps Torlon® roller bearings separated and parallel to reduce friction
• 100 mm (3 15/16 in) sheave diameter accommodates lines up to 16 mm (5/8 in)
• Maximum working load: 3402 kg (7500 lb); breaking load: 6804 kg (15000 lb)
• Standup block design with integrated becket for multi-purchase rigging
• Includes padeye; uses 648 padeye hole spacing and base dimensions
• Fasteners: 10 mm / 3/8 in flat head
• Overall length: 235 mm (9 1/4 in); weight: 921 g (32.49 oz)