Harbor hook GSH

for work boatsfor tugboatsquick-release

Overview
The Straatman Type GSH quick release towing hook supports safe and efficient towing operations across a wide range of vessels. The hook operates manually using a lever or rope. The required operating force remains below 33 pounds, even at full safe working load. An integrated two-step release mechanism reduces the risk of accidental opening during use.

The GSH towing hook is available with safe working loads ranging from 15 to 100 tonnes, making it suitable for different vessel types and towing requirements.
Key benefits

• Release under load: releases the towing line while under full tension up to the hook's rated capacity for fast emergency response.
• Reduced manual handling and improved crew safety by enabling controlled release from a safe position.
• Proven release-under-load designs with long-term service and support.

Types and functionality

• Type GSH: Disc-type manual quick release towing hook. Operated manually by lever or rope; required operating force remains below 33 pounds (≈15 kg) even at full SWL. Integrated two-step release mechanism reduces accidental opening. Counterbalanced disc design limits energy on release and permits quick controlled manual resetting. Typical SWL availability: 15 to 100 tonnes.
• Type GMH: Combined mooring and towing hook providing both functions. Supplied with a rope keeper to enable safe controlled switching between mooring and towing operations while maintaining control and safety.

Configuration and options
Straatman configures hooks to match vessel layout and operational needs. Available options include:

• Spring-loaded shock absorber
• Customised hook geometries
• Local hydraulic or pneumatic release
• Remote-controlled release
• Integration with load monitoring systems
• Foundations, brackets or towing posts for deck installation

Testing & certification
Straatman tests every quick release towing hook in-house using calibrated hydraulic test equipment (capacity up to 3,500 kN) to ensure consistent quality and verifiable performance prior to delivery. Disc-type hooks undergo proof load testing up to 200% of specified SWL; for example the GSH-100 model is proof-tested at 150% SWL in line with its design criteria. Release function is verified at SWL. A client-selected classification society may witness the full testing process if required.

Special designs & project-specific solutions
Straatman supports project-specific designs, including integrated foundations for direct welding to deck and hydraulic shock absorbers developed with partners to improve load control and simplify installation.

Intended applications

• Tugboats, escort tugs, offshore support vessels and harbour service vessels.
• Operations where towing loads change rapidly and immediate controlled release is required.

Technical specifications

• Product type: Disc-type quick release towing hook
• Brand: Straatman
• Commercial name: Quick Release Towing Hook
• Models/types: GSH, GMH
• GSH SWL availability: 15 to 100 tonnes (typical)
• Operating force (GSH): below 33 pounds (≈15 kg) maximum
• Release mechanism: integrated two-step release; controlled release while line remains under tension
• Resetting: manual counterbalanced disc design for quick controlled manual resetting
• Proof load testing: up to 200% SWL (general); GSH-100 example tested at 150% SWL
• Testing equipment capacity: calibrated hydraulic test rig up to 3,500 kN
• Options: spring-loaded shock absorber, customised designs, hydraulic/pneumatic or remote release, load monitoring integration, foundations/brackets/towing posts