316 Stainless Steel Round Boat Porthole
Upgrade or replace a round marine window with a mirror-polished 316 stainless steel porthole, tinted acrylic glazing and a six-hole mounting flange. Choose from nominal 5, 6 and 7 inch variants.
In stock: Select the required nominal size before adding to cart. Confirm the technical dimensions rather than relying on the nominal size alone.
Key Features
- 316 stainless steel exterior: Selected for marine applications and finished with a mirror-polished surface.
- Tinted acrylic glazing: Provides a darker window appearance while allowing light into the interior.
- Six-hole mounting flange: Allows the frame to be fastened around the perimeter of a suitable installation surface.
- Three nominal sizes: 5, 6 and 7 inch options are available.
Fit and Measurement
- Check the technical diagram for the selected variant.
- Measure the cut-out, outer flange, mounting depth and fastener positions.
- Confirm clearance for the inner frame and opening/locking hardware.
- Do not treat the nominal 5, 6 or 7 inch name as the installation measurement.
Product Details
| Product type | Round boat porthole / marine portlight |
|---|---|
| Exterior frame | 316 stainless steel |
| Finish | Mirror polished |
| Glazing | Tinted acrylic |
| Nominal sizes | 5, 6 and 7 inches; see technical drawing |
Installation and Care
Professional installation is recommended. Water resistance depends on the cut-out, gasket condition, sealant, fastener pattern and installation quality. Rinse stainless steel after saltwater exposure and inspect for contamination, tea staining or seal deterioration.
Ordering and Delivery
Shipping options and charges are calculated during checkout. Contact sales@airowmarine.com with dimensions and installation photos if fit is uncertain.
Frequently Asked Questions
Will 316 stainless steel never corrode?
316 stainless steel is commonly selected for marine service, but no stainless alloy is maintenance-free in every environment. Cleaning, installation materials and exposure conditions affect long-term appearance.
Is the listed size the cut-out diameter?
Do not assume that it is. Use the technical drawing for the selected variant and verify every installation dimension.
Is this porthole rated for wave impact or pressure?
No specific pressure, impact or IP rating is claimed unless it is supported by a supplied test certificate.