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Hatches can be made from the following materials:
• A36 mild (carbon) steel with these finishes:

Shop cleaned (SP3) and red-oxide primed. This is our standard finish.
Sandblasted to white metal (SP10) and primed with an inorganic zinc primer. Cathacoat 302 (also known as Devoe 302) is the primary inorganic zinc primer we use. This is a premium finish available at an additional cost.
Specialized paint / primer finishes are available at an additional cost. Custom paints may significantly increase the product price, since the paint systems cannot be re-used on other jobs.
Galvanizing is another premium finish available at an additional cost. This finish option also adds at least two weeks to the lead time.

• Grade 5000 series Aluminum

• 304 Stainless Steel

• 316 Stainless Steel

Hatch cover features: (any material)
• 5/16” thick (for ABS Grade) or thicker if needed

• OPTIONAL: Hatch cover can be insulated with a 2” thick layer of ceramic fiber or mineral wool, or fiberglass insulation behind a 10ga panel of sheet metal

• Ceramic fiber or mineral wool are great for insulating for heat

• Fiberglass insulation is great for insulating for heat or cold

Coaming dimensions:
• 1/2” thick = Steel, Aluminum, or Stainless Steel

• Minimum coaming height: 6”

Oval radius:

• Width of hatch divided by 2

• Example of measurements for 20” wide by 36” long hatch:

Take 20” / 2 = 10” radius for oval ends of hatch
Remaining straight section of hatch between curved ends of hatch cover = 36” - 10” - 10” = 16” long straight section (typically where hinges are located)

Drop Bolts:

• 7/8” diameter x 5 1/2” long; Manganese Bronze; 6” wide wing nuts

• Drop bolts also made from 304 Stainless Steel, with 316 Stainless wing nuts

• Eye of drop bolt protrudes 2 1/2” from outside face of coaming

• Minimum clearance required between bulkhead and outside face of coaming is 5” to allow wing nut to rotate fully.

Gaskets:
• 30 +/- 5 Durometer extruded neoprene, 3/4” x 1-1/4”

• Computing gasket length

Spacing for Hatch Cover Swing:

• To allow the hatch cover to open to 90 degrees, the coaming must be a minimum of 5” away from the nearest bulkhead

ABS Type Approval / Classing Agency Approval:
• All doors are built to standards generally accepted by ABS, USCG, and other classing agencies.

• Doors do NOT carry ABS “Type” approval. For further explanation, click here.

• Drawings and release letters are available for submission for classing agency review.

• It is the responsibility of the customer to verify which certification requirements (i.e. ABS, USCG, DNV, SOLAS) apply to their vessel, and to check with their local governing agency as to the requirements for certifications for all of the items quoted, based on the use for each item on the vessel, and the location of each item as installed on the vessel. Depending on the requirements of the governing agency, additional testing at the manufacturing plant may be required. A separate fee will be charged for any testing.

• Doors conform to C-class fire rating - they are made of non-combustible materials, however, they are NOT designed or certified to resist the passage of fire from one space to another.

Hatch #208

Raised Water-Tight with Drop Bolts, Oval

For additional information download our pdfs and watch our videos

CEN-TEX spare parts