Hammar Hydrostatic Release Unit Green Model HRU for Small Liferafts


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Hammar Hydrostatic Release Unit
Green Model Small Raft


The Hammar Hydrostatic Release Unit Green Model Small Raft is designed for liferafts from 4 up to 12 persons and outside SOLAS regulations.

For liferafts smaller than 4 persons, please contact the liferaft manufacturer or CM Hammar AB.


The Hammar H20 for small rafts consists of a double looped white rope line, a release mechanism and a Red Weak Link with a green lower thimble (breaking strength 1,2 +/- 0,4 kN).

The white strong rope of Hammar H20 is secured to the deck or liferaft cradle and attached to the liferaft lashing with a slip hook.

If the ship sinks, the water pressure will, within approx. 4 metres, activate a sharp knife, that cuts the white strong rope and the liferaft will float free. As the ship sinks, the liferaft painter line will be stretched and the liferaft starts to inflate.

The Red Weak Link breaks and survivors can board the floating liferaft.

2 Year Life


Servicing Intervals

The Hammar H20 needs no annual service, maintenance or spare parts, but MUST BE REPLACED EVERY TWO YEARS.



The Hammar H20 Hydrostatic release units are approved all over the world, fulfil the requirements of the SOLAS 74/96 Convention, Reg. III/4 LSA Code, MO Res. MSC. 48/(66), IMO Res. MSC. 81(70), approved to EU Directive 96/98 EC on Marine Equipment and has a NATO stock number.

Release depth 1,5 – 4,0 metres according to IMO/SOLAS regulations. The required certificates can be downloaded under Approvals.


Please Note: Due to MCA regulations, all HRUs are now date marked and therefore, cannot be refunded after purchase


Watch the HAMMAR HRU in action



Delivery Information

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