B4056 ISS B
Ocean Hatch Fitting & Adjustment Instructions
(To be retained in owners manual for future reference)
Ocean hatches are for use on all craft types in accordance with ISO/DIS 12216.2(E), DESIGN CAT "A", AREAS II, III and IV. Modification of the hatch by the fitting of vents etc. will invalidate the compliance with the standard.
Fitting Instructions
Ocean hatches should be fitted to a flat surface with a maximum tolerance of +/- 1mm and a deck / hull thickness of
Do not open and close the hatch more than necessary until the lower frame is securely mounted.
Mark the deck with a pencil around the inside edge of the lower frame. For hatches with a lower frame flange, increase the aperture size by 3mm all around.
It is essential that the lower frame is placed square on the deck opening.
When fitting a number of hatches it is advisable to prepare a template.
Cut out deck along pencil line using a suitable saw.
Where the deck is of composite construction, it is recommended that the exposed laminate be sealed with the appropriate material prior to fitting the hatch. Openings cut in metal decks should have all burrs and sharp edges removed.
Hatches should not be considered as stiffening members and it is recommended that the deck be adequately stiffened to prevent distortion during heavy weather.
Position lower frame over hole and drill two fixing screw holes in opposite corners. Insert appropriate stainless steel fasteners.(see below).
Deck type
Wood | M5 through bolts or marine grade wood screws. |
GRP/Steel/Al Alloy | M5 through bolts or machine screws into suitable tapped plates. |
Fixing Sizes | M5, 10UNC, 2BA, 3/16", Wood screws (min. length 40mm). |
Hinge Fixings | M6 or 1/4" through bolts only. |
Drill remainder of holes and fasten down from the centre working out to the edges. Clean off surplus sealant.
Through bolts should be used where fixings pass through lower hinges (M6 or 1/4" only).
Once installed check for correct operation of the hatch lid, ie. closing/locking, even pressure of seal etc.
