Black Quartz Undermount Sink for Bar and Prep Stations
The Karran QU-690 is a square single-bowl quartz composite sink built for bar counters, islands, and dedicated prep stations where a compact footprint and a sharp, dark finish need to coexist. Its 16-5/8 by 16-5/8 inch bowl mounts beneath the countertop, keeping the work surface clean and uninterrupted.
Key Features
• Quartz composite construction — 80% natural quartz crystals and 20% acrylic resin deliver a sink that resists scratches, stains, chips, and heat through demanding daily use.
• Black finish — a deep, uniform Black color that holds its tone across the quartz composite and coordinates with matte and dark hardware palettes.
• Square single-bowl layout — a 16-5/8 by 16-5/8 inch bowl in a symmetrical format that fits tight island and bar cabinet runs equally well in either orientation.
• Undermount installation — the flat mounting rim seats beneath the countertop with no exposed lip, making cleanup a straight wipe from counter edge to bowl.
• 8-1/4 inch bowl depth — enough depth to contain splashing and handle full-size bottle rinsing or deep mixing bowls without crowding the cabinet below.
• No faucet deck — faucet and accessories mount through the countertop, keeping the design clean and giving the fabricator full control over hole placement.
Where This Sink Earns Its Place
A square black quartz sink is a deliberate choice — one that tends to appear in kitchens and wet bars where the hardware, fixtures, and surfaces are already working in a dark or high-contrast palette. The QU-690 handles the workhorse tasks of a bar station: bottle rinsing, ice dumping, drink prep, and the occasional produce wash when the main sink is occupied. Its compact square bowl also performs at a dedicated prep station on an island, where a full-size sink would crowd the counter run but a shallow bowl would fall short on capacity. Woodworking shops and fabrication studios that build laminate or solid surface counters frequently stock this model for customer installs where the designer has called for a black undermount at the secondary station.
Quartz Composite in Black
Quartz composite performs differently from stainless in a dark finish — it does not show water spots the same way, and the matte texture of the Black color absorbs ambient light rather than reflecting it. Karran's 80% quartz and 20% acrylic resin formula makes the bowl highly scratch, stain, chip, and heat resistant, and the color runs through the material rather than sitting on top as a surface coating. That means chips and abrasions that would expose bare metal on a coated sink do not produce a contrasting mark here. The sink is designed for indoor installation; for outdoor bar or prep stations, a stainless option rated for exposure is the right call.
Who Specifies the QU-690
Interior designers and kitchen designers who work in dark material palettes — matte black fixtures, charcoal quartz counters, black cabinet hardware — reach for this sink as the undermount that finishes the scheme at the secondary station. Cabinet shops building bar cabinets and island runs in quartz or solid surface countertops install it for clients who want the functionality of a dedicated prep bowl without a second large cutout. Contractors sourcing a compact undermount for a wet bar renovation find the square format easier to center in a narrow run than a rectangular bowl. The 16-5/8 inch square footprint also makes it one of the more space-efficient quartz undermounts available at this depth.
Does the faucet mount through the sink or through the countertop?
Through the countertop. The QU-690 has no faucet deck, so all faucet holes are drilled into the counter material by the fabricator. This gives you full control over faucet placement and spacing.
Is this sink compatible with quartz and granite countertops?
Yes. As a QU Series undermount, it mounts beneath quartz, granite, and solid surface countertops using standard undermount clip and adhesive methods. It is not a seamless-series sink and does not use the seamless laminate installation method.
Are clips or a template included with the sink?
Karran QU Series spec sheets state that neither mounting clips nor a paper template are included with this line. Your fabricator will supply the appropriate clips for your countertop material, and Karran offers downloadable DXF files for CNC cutouts.
Will the Black color show water deposits or mineral buildup?
Quartz composite in a dark color can make hard water deposits more visible than a lighter sink. Regular wiping after use and a periodic cleaning with a non-abrasive cleanser keeps the finish looking consistent. The color is carried through the material, so it does not fade or chip away.
What size base cabinet does this sink require?
At 16-5/8 inches square overall, this sink fits a compact base cabinet. Verify the actual sink dimensions against your cutout before cutting, as published dimensions for this series are accurate to 1/4 inch.
A Bar Station That Stays Sharp
The QU-690 in Black brings a secondary sink into a dark-palette design without compromise on depth, durability, or the clean line of an undermount install — a compact square bowl that works as hard as the kitchen it serves.
