HARKEN Through-Deck Block / Type HK421 / 1 sheave

Ideal blocks for high performance dinghies, windsurf, kite surf, etc... Micro blocks feature free-running Delrin ball bearings sheaves and stainless steel side plates and they ensure easy control of any lines. They will find many applications on big boats as well. Sheave diameter: 22 mm. Breaking load: 544 kg. Full range

• Rinse blocks regularly and thoroughly with warm fresh water to remove salt and dirt (carefully assist with a soft brush if necessary).
• For heavier soiling: Soak the block in warm fresh water with a little dish soap and move the rollers (do not use harsh cleaners).
• Avoid pressure washers, as water and dirt can be forced into the bearing.
• Allow to dry thoroughly afterwards to prevent corrosion.
• Lubricate only when necessary and according to the manufacturer's instructions.
  • Note: Many modern bearings are maintenance-free or self-lubricating – improper lubrication can impair their function.
• Disassemble only if explicitly instructed by the manufacturer, as not all blocks are designed for maintenance or disassembly.

Features

Discover the features that make this product stand out. From technical details to special functions – we’ve summarized all the key information for you.

Type of bearing

Ball bearing

Working load in kg

113 kg

Material

Stainless steel V4A Plastic