Harken

USA – Tel: (+01) 262-691-3320 • Web: www.harken.com • Email: harken@harken.com

Italy - Tel: (+39) 031 3523511 • Web: www.harken.it • Email: techservice@harken.it

⚠️ WARNING! Strictly follow all instructions to avoid an accident, damage to your vessel, personal injury, or death. See www.harken.com/manuals for additional safety information.

Uses

• Twing, tweeker control for code zero sheets
• Can be used as snatch block when combined with soft shackle
• Spinnaker sheet and guy control

Features

• Side opening sideplate - Easy to rig and remove from sheet
• Spring loaded button release - Quick one-handed rigging
• Anti-capsize bar - Keeps sheave aligned on sheet
• ULC main bearing - Sheave turns smoothly under extreme loading
• Sideload balls - Carry loads especially when block not aligned in light air
• Thimble at pivot base - Use 1:1 or 2:1 up-down control
• Machined aluminum inner sideplates - High strength, low weight
• Soft polyurethane outer sideplate bumpers - Protects block and deck

Terms

The block features a main sheave, aluminum inner sideplates, and polyurethane outer sideplate bumpers. Key components include the release button, anti-capsize bar, sideload balls, and a thimble at the pivot base for 2:1 rigging. The block can be in a closed position (secured) or open position.

Specifications

Rigging Options

1:1 up-down control: The control line is spliced or knotted directly to the thimble at the pivot base.

2:1 up-down control: A control line is routed around the thimble at the pivot base.

Use

To rig the block: Hold the block in one hand and use your index finger to press the release button. Load the sheet onto the block. Close and latch the sideplate. Listen for an audible click to confirm it is secured.

IMPORTANT! Do not load the sheave if the sideplate is unlatched. Always confirm the sideplate is latched before applying load.

Use (continued)

If the sheet is larger than 5/16" (8 mm), remove the anti-capsize bar to allow a larger sheet to be used. The anti-capsize bar may also be removed for 1:1 up-down control setups using a spliced eye to prevent capsizing.

IMPORTANT! The anti-capsize bar is not designed to secure loaded lines; use the thimble and sheave for this purpose.

To adjust sideplate rotation friction, tension the adjusting nut.

WARNING! Over-loosening the adjusting nut can disengage the lock mechanism or allow the nut to spin freely, failing to secure the block. If the nut spins without tools, it is too loose and should be replaced with a Nylock® nut (a registered trademark of Nylok Corporation).

Maintenance

Periodically clean the release button mechanism, sheave, and hinge base using a mild detergent and water solution. Distribute the solution by spinning the sheave, then open and close the sideplate. Flush with fresh water. Do not use lubricants on the sheave.

Warranty

For additional safety, maintenance, and warranty information, see www.harken.com/manuals or the Harken catalog.

Document reference: M1035 01-24