Description
HARKEN 16 mm Exit Block – Model 421
Overview: The HARKEN 16 mm Exit Block Model 421 is a durable, low-friction block engineered to redirect small-diameter control lines cleanly out of tight spaces on dinghies and light sailboats. Its design allows efficient line deflection and smooth movement under load.
- 16 mm Sheave Size: Ideal for small control lines and trim systems.
- Smooth Line Deflection: Reduces friction for efficient line handling.
- Articulating Design: Allows slight adjustment for optimal line lead.
- Lightweight Construction: High-strength materials minimize added weight.
- Marine Hardware Component: Suited for dinghy and small-boat control systems.
Why You’ll Like It: This exit block improves the routing of control lines, reducing chafing and effort while enhancing responsiveness in sail trim and maneuvering.
Built for Marine Use: Designed for dinghy and small sailboat applications, the block withstands saltwater exposure, UV, and repeated load cycles for dependable performance.
What’s In The Box
- HARKEN 16 mm Exit Block
Specifications
| Brand | HARKEN |
| Model / Part Number | 421 |
| Key Spec | 16 mm exit block |
| Application | Marine |




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