American Standard Portsmouth 3...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$630.81
American Standard Portsmouth 30 x 18-Inch Stainless Steel Undermount Single-Bowl ADA Kitchen Sink - AMS-18SB6301800S

American Standard Portsmouth 30 x 18-Inch Stainless Steel Undermount Single-Bowl ADA Kitchen Sink - AMS-18SB6301800S

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Model: 18SB6301800S.075
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$630.81
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Portsmouth 30 x 18-Inch Stainless Steel Undermount Single-Bowl ADA Kitchen Sink
  • Single-bowl stainless steel kitchen sink
  • 18-gauge stainless steel
  • 6" depth with offset drain
  • Undermount installation
  • 33" (838 mm) cabinet required
  • Includes: - 9028000.075 Waste Fitting - 791676-100.0070A Undermount Sink Clips
  • Features SoundSecure+ sound pads
  • Features StoneLock undercoating
  • Cutout template and instructions included
  • Nominal Dimensions: 29-3/4" x 18" x 6" (756 x 457 x 152 mm);Bowl Size: 27-3/4" (705 mm) wide 16-1/8" (410 mm) front to back 6" (152 mm) deep

Manufacturer Resources

Product Specs

Product Type:
Undermount Sink
Product Group:
Kitchen
Product Subgroup:
Sinks
Family:
PORTSMOUTH
Luxury/Non Luxury:
Luxury
Residential Commercial:
Residential
Product Length:
34.875
Product Height:
12.375
Product Weight:
19.218
Product Width:
20.563
Department:
Plumbing

American Standard 18SB6301800S.075 – Frequently Asked Questions

1) What size cabinet do I need for the American Standard Portsmouth 30 x 18 undermount kitchen sink?
Plan on a 33 inch (838 mm) sink base. The bowl itself is 29-3/4 x 18 x 6 inches (756 x 457 x 152 mm) nominal, so a 30 inch cabinet will not leave room for the rim and the undermount clips. If your run is built around 30 inch bases, this is the wrong sink for that opening.
2) Is the Portsmouth undermount single-bowl sink shallow enough for an ADA-compliant counter?
Yes. The bowl is 6 inches (152 mm) deep with an offset drain, which is the shallow-bowl configuration used for accessible sink installs so knee clearance under the counter isn't lost to the bowl and the trap can be pushed toward the back wall. American Standard lists it as an ADA kitchen sink.
3) Does the Portsmouth undermount sink come with mounting clips and a drain, or do I have to order those separately?
Both are in the box. It ships with waste fitting 9028000.075 and undermount sink clips 791676-100.0070A, plus a cutout template and instructions. You'll still need to supply the countertop adhesive/silicone, the tailpiece and P-trap, and the faucet, since an undermount sink has no deck holes and the faucet mounts through the countertop.
4) Is 18-gauge stainless heavy enough, and will this sink be noisy?
The bowl is 18-gauge stainless, the common step up from the 20- and 22-gauge bowls found in builder-grade sinks. Noise is handled two ways: SoundSecure+ sound pads on the underside of the bowl and StoneLock undercoating, which together cut the drum effect from the disposal and running water.
5) Will an undermount sink like this work with a laminate countertop?
Undermount is meant for stone, quartz, or solid-surface tops with a finished, sealed cutout edge, because the clips pull the sink up against the underside of the slab and the exposed edge of the cutout stays wet. Standard particleboard laminate has no sealed edge for that. If your tops are laminate, look for a drop-in or top-mount sink instead.
6) Is this American Standard Portsmouth sink suitable for a commercial kitchen?
American Standard classes the Portsmouth 30 x 18 undermount as a residential sink. It's a good fit for apartment turns, multi-family units, and accessible residential kitchens. A commercial food-service kitchen needs a sink built to the plumbing code for that occupancy, not a residential single bowl.
7) Does the offset drain change how I plumb the trap under this sink?
Yes, and that's the point of it. The drain sits off center rather than in the middle of the bowl, so the tailpiece and trap can be run to the back of the cabinet instead of straight down the center. On an accessible install that's what keeps the knee space under the counter clear.
8) What is the model number to order the stainless Portsmouth ADA undermount sink?
The manufacturer part number is 18SB6301800S.075, in the single stainless steel finish. It belongs to American Standard's Portsmouth family, so it matches other Portsmouth kitchen fittings if you're standardizing a unit or a whole building.
How fast can I get the American Standard 18SB6301800S.075 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the American Standard 18SB6301800S.075 come with a warranty?
Absolutely. The American Standard 18SB6301800S.075 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the American Standard 18SB6301800S.075?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
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