Harken
Harken 406 16mm Double Block Micro Sailing Pulley
The Harken 406 16mm Double Block is a compact, lightweight ball-bearing pulley designed for small-diameter synthetic control lines used on modern dinghies and performance sailing boats.
As Harken’s smallest block range, the 16mm series is engineered for applications where minimal weight, compact dimensions and smooth line movement are important. The Harken 406 features two 16mm sheaves, allowing it to be used in compact multi-part purchase systems for sail-control adjustments.
Its patented bearing system uses stainless steel balls running in a captive grooved race, helping provide smooth operation while preventing loose bearings during normal use or servicing.
The block accepts lines up to 5mm diameter and has a published maximum working load of 204kg, making it suitable for correctly engineered dinghy control systems and other compact sailing applications.
Key Features
- Genuine Harken part number 406
- Two 16mm sheaves
- Designed for small synthetic control lines
- Stainless steel ball bearings
- Captive grooved bearing race
- Compact double-block configuration
- Lightweight 27g construction
- Accepts rope up to 5mm
- Maximum working load of 204kg
- Breaking load of 544kg
- Ideal for high-tech dinghy control systems
- Smooth, low-friction line movement
Why Buy from Barton Marine NZ?
Barton Marine NZ supplies genuine Harken sailing hardware for New Zealand dinghy sailors, yacht owners, sailing clubs and marine professionals.
The Harken 406 is a practical choice when building or replacing a compact double-block purchase system using small-diameter control rope.
Suitable for:
- Racing dinghies
- Sports dinghies
- Small catamarans
- Sail-control purchase systems
- Cunningham systems
- Outhaul systems
- Vang control systems
- Centreboard and daggerboard controls
- Adjustable rig-tension systems
- Other small-line control applications
Technical Specifications
| Specification | Details |
|---|---|
| Brand | Harken |
| Product number | 406 |
| Product type | Double ball-bearing block |
| Number of sheaves | 2 |
| Sheave diameter | 16mm |
| Overall length | 43mm |
| Weight | 27g |
| Maximum line diameter | 5mm |
| Maximum working load | 204kg |
| Breaking load | 544kg |
| Bearing system | Stainless steel balls in a captive grooved race |
| Becket | No |
These dimensions and load ratings are the current specifications published by Harken for the 406 16mm Double Block.
Common Applications
The Harken 406 can be used in appropriately designed systems for:
- Dinghy boom-vang purchases
- Cunningham purchases
- Outhaul controls
- Traveller-control systems
- Centreboard control lines
- Daggerboard control systems
- Rig-tension adjustments
- Small-line cascade systems
- Lightweight sail-control purchases
- Custom dinghy control layouts
The block should be selected according to the calculated system load, rope diameter, lead angle and required safety margin.
Performance Benefits
- Creates compact multi-part purchase systems
- Reduces the effort needed to adjust control lines
- Supports modern small-diameter synthetic rope
- Provides smooth movement through stainless ball bearings
- Minimises added weight in performance dinghy systems
- Offers a high working load relative to its compact size
- Captive bearing design improves component retention
- Genuine Harken performance and compatibility
