Alpha International U311-25 Stainless Steel Single Bowl Undermount Cutout
Description
The Alpha International U311-25 represents a professional-grade solution for larger kitchen installations requiring maximum bowl capacity. This 31.25-inch single bowl undermount sink features commercial-grade 304 stainless steel with an elegant satin finish and thoughtfully designed rounded corners. The generous 29.25-inch bowl width accommodates oversized cookware while the 9-inch depth provides ample workspace for commercial-style food preparation. Our comprehensive DXF template package includes four precision-engineered cutout variants suitable for various installation methods and material thicknesses. Stone fabricators appreciate the U311-25 for its compatibility with standard 35-inch cabinet bases and its versatile design that works across granite, quartz, and solid surface applications.
Dimensions
- Overall Width
- 31.25"
- Overall Depth
- 18"
- Bowl Width
- 29.25"
- Bowl Depth
- 16"
Specifications
- Manufacturer
- Alpha International
- Model Number
- U311-25
- Installation Type
- Undermount
- Bowl Configuration
- Single
- Material
- Stainless-Steel
- Min. Cabinet Width
- 35"
- Downloads
- 0
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The Alpha International U311-25 represents a professional-grade solution for larger kitchen installations requiring maximum bowl capacity. This 31.25-inch single bowl undermount sink features commercial-grade 304 stainless steel with an elegant satin finish and thoughtfully designed rounded corners. The generous 29.25-inch bowl width accommodates oversized cookware while the 9-inch depth provides ample workspace for commercial-style food preparation. Our comprehensive DXF template package includes four precision-engineered cutout variants suitable for various installation methods and material thicknesses. Stone fabricators appreciate the U311-25 for its compatibility with standard 35-inch cabinet bases and its versatile design that works across granite, quartz, and solid surface applications.
Installation Overview
Successful installation of the U311-25 requires attention to both structural support and cutout precision. The sink's overall dimensions of 31.25 x 18 inches demand a minimum 35-inch cabinet base to ensure adequate mounting surface and plumbing clearance. The 29.25-inch bowl opening represents a significant cutout in most countertop materials, making proper support critical. For standard 3cm material installations, we recommend the 1/8-inch reveal variant (29 x 15.75 cutout), which provides optimal edge support while maximizing bowl exposure. The rounded corner design with its gentle radius distributes stress evenly, reducing fracture risk in natural stone materials. Apply a continuous bead of high-quality silicone adhesive around the entire cutout perimeter before positioning the sink. Install mounting clips at 6-inch intervals, ensuring even pressure distribution and additional clips near corners. The center drain configuration at 3.5 inches accommodates standard disposal units and provides reliable drainage performance.
CNC Cutting Notes
CNC programming for the U311-25 requires careful attention to the larger bowl dimensions and corner radius specifications. Use a 1/4-inch or 3/8-inch ball nose bit to achieve smooth corner transitions that match the rounded design. The larger cutout dimensions mean more material removal, so plan for adequate roughing passes at 100-120 IPM with a 1/2-inch diameter spiral bit, leaving 0.020-0.030 inches for finishing. Set finishing passes at 60-80 IPM to ensure clean edges and accurate dimensions. The 29.25-inch bowl width requires verification of CNC table clearances and proper material clamping to prevent movement during cutting. For the no-reveal variant, ensure precise positioning as the large cutout leaves minimal edge material for error correction. Spindle speeds of 18,000-22,000 RPM work well with carbide tooling across granite and engineered stone. Always run simulation programs to verify corner radii and edge positions before cutting expensive materials.
Material Compatibility
The U311-25 template delivers excellent performance across all common countertop materials, with its larger dimensions requiring careful material selection and support planning. Granite fabricators should evaluate slab integrity carefully, as the 29.25-inch cutout approaches maximum safe dimensions for materials with prominent veining or natural fissures. The rounded corner design helps distribute stress, but adequate edge width (minimum 3 inches from cutout to slab edge) remains essential. For quartz installations using Cambria, Caesarstone, Silestone, or similar brands, the template works beautifully in both 2cm and 3cm thicknesses - consider the 1/2-inch overhang variant (28.25 x 15 cutout) for 2cm applications to maximize edge support. Quartzite installations benefit from the rounded corners which reduce stress concentration compared to sharp-corner designs. Solid surface materials integrate seamlessly, with the large bowl size showcasing the material's ability to create uninterrupted surfaces.
Where to Buy
Alpha International U311-25 sinks are available through professional plumbing distributors and authorized kitchen specialty retailers across North America. Typical retail pricing ranges from $250-425 depending on gauge options (18-gauge standard, 16-gauge premium) and finish selections. For dealer locations and contractor pricing information, contact Alpha International directly at 888-255-2574 or info@alpha-int.com. Many distributors maintain stock of popular sizes and can provide next-day delivery for rush installations. The sink includes mounting clips and installation instructions. Free DXF templates are available from the manufacturer's website for verified fabrication professionals.