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Lewmar Low Profile Hatch Specifications

Low Profile Hatch

Best mid range hatch in the business.

The Low Profile Hatch has soft styling and sleek looks, ideal for use on a powerboat. Smaller ventilation hatches are suitable for any deck location on sailboats, while the larger sizes can be used as a foredeck hatches on smaller to midsize yachts.

  • Outside handles allow the hatch to be opened from on deck if it is not locked
  • Low profile hatches open up to 180 degrees (round hatches open to 170 degrees)
  • Friction levers hold the lid open in any position up to 95 degrees
  • Anodized aluminum frame for corrosion resistance
  • Curved upper frame profile for strength as well as modern styling
  • Available in Round and D-Hatch configuration

Sizing Chart:

Note: click on your preferred part number to be redirected to the product.

Part No. Friction Lever Lid Part No. Hatch with Stay Size Overall Dimensions Cut-out Dimensions Weight Acrylic Window Thickness
LOWER FRAME FLANGE X LENGTH Y WIDTH Z HEIGHT R RADII X1 WIDTH Y1 LENGTH R1 RADII
mm in mm in mm in mm in mm in mm in mm in mm in kg lb mm in
39900030 0 15 9/16 281 11 1/16 281 1 11/16 25 1 72.5 2 7/8 211 8 5/16 211 8 15/16 42.5 1 11/16 1.6 3.5 8 5/16
39903030 3 15 9/16 246 9 11/16 301 11 7/8 25 1 72.5 2 7/8 176 6 15/16 231 9 1/8 42.5 1 11/16 1.6 3.5 8 5/16
39910030 399100303 10 15 9/16 330 13 330 13 25 1 72.5 2 7/8 260 10 1/4 260 10 1/4 42.5 1 11/16 2.2 4.9 8 5/16
39920030 20 15 9/16 272 10 11/16 417 16 7/16 25 1 72.5 2 7/8 202 7 15/16 347 13 11/16 42.5 1 11/16 2.3 5.1 8 5/16
39930030 399300303 30 15 9/16 397 15 5/8 527 20 3/4 25 1 72.5 2 7/8 327 12 7/8 457 18 42.5 1 11/16 4.2 9.3 8 5/16
39940030 399400303 40 15 9/16 491 19 5/16 491 19 5/16 25 1 72.5 2 7/8 421 16 9/16 421 16 9/16 42.5 1 11/16 4.6 10.1 8 5/16
39941030 41 15 9/16 246 9 11/16 491 20 3/16 25 1 72.5 2 7/8 176 6 15/16 421 16 9/16 42.5 1 11/16 2.5 5.5 8 5/16
39944030 399440303 44 15 9/16 512 20 3/16 512 22 11/16 25 1 72.5 2 7/8 442 17 3/8 442 17 3/8 42.5 1 11/16 4.8 10.6 8 5/16
39950030 399500303 50 15 9/16 447 17 5/8 577 22 11/16 25 1 72.5 2 7/8 377 14 13/16 507 19 15/16 42.5 1 11/16 4.8 10.6 8 5/16
39954030 399540303 54 15 9/16 462 18 3/16 577 22 11/16 25 1 72.5 2 7/8 392 15 7/16 507 19 15/16 42.5 1 11/16 4.9 10.6 8 5/16
39960030 399600303 60 15 9/16 577 22 11/16 577 22 11/16 25 1 72.5 2 7/8 507 19 15/16 507 19 15/16 42.5 1 11/16 6.4 14.1 10 3/8
39965030 65 15 9/16 560 22 11/16 560 min 22 11/16 25 1 72.5 2 7/8 See Drawing Above 42.5 1 11/16 6.5 14.3 10 3/8
9/16 675 max 26 9/16


Low Profile Round Hatch

Sizing Chart:

Note: click on your preferred part number to be redirected to the product.

Part No. Friction Lever Lid Size Overall Dimensions Cut-out Dimensions Weight Acrylic Window Thickness
LOWER FRAME FLANGE DIAMETER Z HEIGHT HX HINGE LENGTH HY HINGE WIDTH DIAMETER 1
mm in mm in mm in mm in mm in mm in kg lb mm in
39918030 18 15 9/16 490 19 15/16 25 1 493 19 7/16 141 5 9/16 420 16 9/16 3.8 8.4 8 5/16
39903030 22 15 9/16 588 23 1/8 25 1 591 23 1/4 173 6 13/16 518 20 3/8 5.8 12.8 10 3/8




Low Profile D-Hatch

Sizing Chart:

Note: click on your preferred part number to be redirected to the product.

Part No. Self Supporting Lid Size LOWER FRAME FLANGE Overall Dimensions Cut-out Dimensions Weight Acrylic Window Thickness
X LENGTH Y WIDTH Z HEIGHT R RADII X1 WIDTH Y1 LENGTH R1 RADII
mm in mm in mm in mm in mm in mm in mm in mm in kg lb mm in
39951030 51 15 9/16 448 17 5/8 588 23 1/8 25 1 72.5 2 7/8 378 14 7/8 518 20 3/8 42.5 1 11/16 5.5 12.1 8 5/16
30067300 64 15 9/16 500 19 11/16 600 23 5/8 25 1 72.5 2 7/8 430 16 15/16 530 20 7/8 42.5 1 11/16 6.4 14.1 8 5/16

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