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SELECTION GUIDE

The Harken blocks most commonly used for a dual-line mainsail reefing system, and the lazy-jack kit, by boat length.

DocumentHarken Mainsail Reefing & Lazy Jack Selection Guide
FormatPDF · 1 page · 1.4 MB
LanguageEnglish
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Harken Mainsail Reefing & Lazy Jack Selection Guide

Dual-Line Reefing & Lazy Jacks

Small boat Midrange Big boat
Boat length 6.7 – 8.5 m
22 – 28' 		8.8 – 10.4 m
29 – 34' 		10.7 – 12.8 m
35 – 42'
Ref. Dual line Small boat Midrange Big boat
A Cheek 2644
View → 		6106
View → 		3220
View →
B Single 2650
View → 		2600
View → 		3215
View →
C Mastbase block 222
View → 		1986
View → 		1988
View →
D Bullseye 339
View → 		237
View → 		237
View →
A Lazy jack kit 252
View → 		253
View → 		254
View →

Part numbers are the hardware most commonly used, not the only option.

How It Leads

  • A cheek block on the boom end for the reef line.
  • B single block under the boom.
  • C mastbase blocks leading the lines aft.
  • D bullseye at the luff.
  • Dual-line reefing is common on boats of 9 m (30') and larger. Position the blocks so the line pulls down and out, keeping the sail flat and taking lateral load off the luff rope or slides.
  • Lazy jacks contain the main while reefing and dousing; they work especially well with full-battened mains but suit conventional sails too.

Diagram

Harken dual-line reefing and lazy jack layout

Need a part that isn't listed? Ask us to source it and quote the part number from the PDF.

Products in this Selection Guide