The Lewmar Ocean Series Hatch Flat Bases offer durable mounting solutions for deck hatches, designed to fit flat surfaces with a maximum tolerance of +/- 1mm using M6/1/4" hinge fasteners and 5mm CSK No.10 UNC/2 BA lower frame screws. Featuring Smoke Grey acrylic in 3/8" or 1/2" thickness, these flat bases provide rugged protection with anodised aluminium frames for corrosion resistance and friction levers that hold lids open up to 95°. Note that flat base hatches are incompatible with trim kits or roller shades, making them ideal for straightforward installations on decks, coachroofs, cockpits, and transoms in CE Area 2 applications.
Key Features
Fits flat surfaces with +/- 1mm tolerance for secure mounting
Friction levers hold hatch open in any position up to 95°
Anodised aluminium frame resists marine corrosion
Smoke Grey acrylic color with 3/8" or 1/2" window thickness
Hinge fastening: M6 / 1/4" screws; lower frame: 5mm CSK No.10 UNC / 2 BA
Suitable for CE Area 2 (deck, coachroof, cockpit, transom); no trim kits or roller shades
Comparison Table
Feature
Size 10
Size 20
Size 30
Size 60
Hatch Weight (lb)
5.77
-
-
17.6
Acrylic Thickness (in)
3/8
3/8
3/8
1/2
Length X (in)
12 3/4
-
15 3/8
22 5/8
Width Y (in)
12 3/4
-
20 1/2
22 5/8
Height Z (in)
1 9/16
-
1 9/16
1 11/16
Radii R (in)
2 15/16
-
-
3
Hinge Length HX (in)
5 7/16
-
13 3/16
14 7/16
Hinge Width HY (in)
10 1/16
-
-
19 3/4
Cut-Out Length X1 (in)
10 1/16
-
12 11/16
19 3/4
Cut-Out Width Y1 (in)
10 1/16
-
17 13/16
19 3/4
Cut-Out Radii R1 (in)
1 9/16
-
1 9/16
1 9/16
What’s in the Box
One Lewmar Ocean Series Hatch Flat Base (size/model as ordered)