
Boating Technology By CRAFTSMAN MARINE 5
Take the required safety measures when fitting this
equipment, especially while cutting into the deck: smoke,
dust and glass fiber particles should be kept away by
wearing goggles, a dust mask and gloves.
The hatch is designed for outward opening only.
Make sure that the part of the boat (deck) into which the
hatch is fitted will be absolutely flush and not curved or
dented, so as to ensure proper watertightness. The
maximum tolerance is +/- 1mm.
Before cutting out the hole, verify the cut-out size of the
hatch. The hatch is hand-made and the dimensions may
show a tolerance on the cut-out size of +/- 2mm.
Sand the cut-out section to be flush (g.r.p.), or make it
free from burrs (steel).
Position the hatch into the cut-out and mark the places of
the bolt holes on deck.
Take the hatch away, drill the fixation holes and remove
the burrs.
Use marine grade sealant and apply it liberally onto the
side of the cut-out hole.(drawing 2)
Reposition the hatch, seal the bottom frame as well and
tighten the hatch onto the deck by using stainless steel
screws or bolts. Tightening by hand with a fitting screw
driver is preferred over an electric tool, as stainless steel
screws tend to break somewhat easily.(drawing 3)
Use stainless steel self tapping screws 4,2 mm in
diameter for polyester or stainless steel M5 bolts for a
steel deck.
Do not use alkaline or acidic cleaning agents for removing
any excess sealant from the deck.
5 Safety precautions Practical installation tips 6
Drawing 2
Drawing 3