Alpha International U311 K Series Stainless Steel Single Bowl Undermount Cutout
Description
The Alpha International U311 K Series combines generous bowl capacity with contemporary sharp-corner aesthetics, making it ideal for modern kitchen installations that demand both form and function. This 31.25-inch single bowl undermount sink features 18-gauge T-304 stainless steel construction with a brushed finish that resists fingerprints and water spots. The sharp corner design creates clean, architectural lines that complement minimalist cabinetry and contemporary kitchen design trends. Our professional DXF template package provides four cutout variants optimized for CNC fabrication in engineered stone and solid surface materials. Fabricators value the K Series for its precise specifications, reliable offset drain configuration, and compatibility with 34-inch minimum cabinet bases.
Dimensions
- Overall Width
- 31.25"
- Overall Depth
- 18"
- Bowl Width
- 14.125"
- Bowl Depth
- 16"
Specifications
- Manufacturer
- Alpha International
- Model Number
- U311 K Series
- Installation Type
- Undermount
- Bowl Configuration
- Single
- Material
- Stainless-Steel
- Min. Cabinet Width
- 34"
- Downloads
- 0
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The Alpha International U311 K Series combines generous bowl capacity with contemporary sharp-corner aesthetics, making it ideal for modern kitchen installations that demand both form and function. This 31.25-inch single bowl undermount sink features 18-gauge T-304 stainless steel construction with a brushed finish that resists fingerprints and water spots. The sharp corner design creates clean, architectural lines that complement minimalist cabinetry and contemporary kitchen design trends. Our professional DXF template package provides four cutout variants optimized for CNC fabrication in engineered stone and solid surface materials. Fabricators value the K Series for its precise specifications, reliable offset drain configuration, and compatibility with 34-inch minimum cabinet bases.
Installation Overview
Installing the U311 K Series requires careful planning and material selection due to its sharp-corner geometry and substantial bowl dimensions. The sink measures 31.25 inches overall width with a large bowl opening, requiring a minimum 34-inch cabinet base for adequate structural support and plumbing access. Sharp corners concentrate stress at corner points, making this sink best suited for engineered quartz or solid surface materials rather than natural stones prone to fracturing. For standard 3cm quartz installations, use the 1/8-inch reveal variant which provides optimal edge support while showcasing the contemporary corner geometry. Apply a continuous bead of high-quality silicone adhesive around the entire cutout perimeter, paying special attention to corner areas where stress concentration is highest. Install manufacturer-supplied mounting clips at 6-inch intervals with additional clips positioned within 2 inches of each corner for maximum support. The offset drain location provides flexibility for plumbing configurations while the 3.5-inch drain opening accommodates standard disposal units.
CNC Cutting Notes
CNC fabrication of the U311 K Series demands precision programming and appropriate tool selection to achieve sharp corners without compromising edge quality. Use a 1/2-inch diameter spiral upcut bit for roughing passes at 100-120 IPM, removing bulk material while leaving 0.025-0.030 inches for finishing. Switch to a 1/8-inch diameter bit for final corner passes - this smaller diameter is essential for achieving tight corners that match the K Series aesthetic. Program corner dwell times of 0.5-1.0 seconds at corners to ensure complete material removal without excessive tool deflection. Set spindle speeds to 18,000-22,000 RPM for carbide tooling in quartz or engineered stone materials. The larger bowl dimensions require verification of CNC workspace capacity and secure material clamping to prevent movement during cutting. Monitor tool wear carefully during corner cutting operations and replace bits showing edge damage to maintain corner precision across multiple jobs.
Material Compatibility
The U311 K Series sharp-corner design performs optimally in engineered materials that resist stress concentration fracturing. Quartz fabricators working with Cambria, Caesarstone, Silestone, Viatera, or similar premium brands will achieve excellent results in both 2cm and 3cm thicknesses. The contemporary corner geometry integrates beautifully with modern quartz aesthetics and complements waterfall edges, mitered corners, and other high-end details. For solid surface installations (Corian, Staron, Hi-Macs, Avonite), the sharp corners align perfectly with the material's thermoforming capabilities and modern design potential. While granite installations are technically possible, exercise extreme caution - avoid materials with prominent veining, natural fissures, or grain patterns that intersect corner areas. The large bowl width requires minimum 3-inch edge support from cutout to slab edge. For 2cm applications, consider the 1/2-inch overhang variant to maximize edge support and reduce stress on thinner material.
Where to Buy
The Alpha International U311 K Series is available through professional plumbing supply distributors and authorized kitchen specialty dealers across North America. Typical retail pricing ranges from $275-450 depending on gauge selection (18-gauge standard) and finish options. For dealer locations in your area or contractor pricing program information, contact Alpha International at 888-255-2574 or info@alpha-int.com. The sink weighs approximately 20 lbs and ships complete with mounting clips, installation template, and comprehensive installation instructions. Many distributors offer next-day shipping for in-stock items. Free DXF templates are available from the manufacturer's website for registered fabrication professionals and countertop shops.