A 31-1/2 Inch Stainless Steel Sink Built for the Primary Kitchen Workstation

The Karran U-6040R is an 18-gauge stainless steel undermount kitchen sink with two unequal bowls, a larger left bowl for washing and a smaller right bowl for rinsing or prep, designed to mount beneath granite, quartz, or solid surface countertops in a 36-inch or wider cabinet.

Key Features

• 60/40 double-bowl split gives a deep primary wash basin on the left and a shorter rinsing or prep basin on the right.
• 18-gauge stainless steel construction with a stainless steel finish throughout.
• Undermount installation into granite, quartz, or solid surface countertops, keeping the counter surface uninterrupted to the bowl edge.
• IAPMO certified for compliance with North American plumbing standards.
• Requires a minimum 36-inch cabinet for proper fit and installation clearance.
• 3-1/2 inch drain opening in each bowl, accepting standard drain hardware.

Two Bowls, Two Jobs

A 60/40 split puts the larger bowl where most of the work happens: soaking a stockpot, washing oversized cutting boards, or handling the main cleanup flow. The smaller right bowl stays available for rinsing produce, draining pasta, or keeping a soap dispenser and sponge out of the primary basin. That division of labor is harder to replicate in a single-bowl or equal-split sink, especially in a busy kitchen where more than one person is working at the counter at once. The left bowl measures 14-3/4 inches long by 18-1/2 inches wide by 8-3/4 inches deep; the right bowl measures 13-5/8 inches long by 16 inches wide by 6-3/4 inches deep.

Material and Build

The sink is 18-gauge stainless steel, a thickness that balances rigidity with manageable weight and is the standard for quality kitchen undermount sinks. Stainless steel holds up to daily temperature changes from hot water and cold rinsing, and the finish does not chip or flake. The undermount rim is machined to bond cleanly beneath the countertop, leaving no raised lip above the counter surface to catch water or debris. IAPMO certification confirms the drain and fixture dimensions meet recognized North American plumbing standards, which matters when a plumber or inspector is on the job.

Where This Sink Belongs

This is a primary kitchen sink, sized and configured for the main kitchen workspace rather than a bar, island prep station, or secondary bowl. It fits a 36-inch base cabinet and mounts under granite, quartz, or solid surface. It is the right choice for a kitchen remodel or new build where the countertop is being fabricated to accept an undermount, and where the cook wants a large primary bowl without giving up a secondary basin entirely. Homeowners planning a full kitchen renovation, designers specifying the main sink for a kitchen package, and cabinet shops staging a complete kitchen installation all work with a sink in this configuration regularly. This SKU is not ADA compliant, so for accessible installations a different sink configuration is needed.

Common Questions

A Working Sink Built Around How Kitchens Actually Function

Choose the Karran U-6040R when the job calls for a stainless undermount sink that keeps a full-depth wash basin and a separate rinsing bowl side by side, certified, calibrated for a 36-inch cabinet, and ready to mount under a hard countertop.