Alpha International U322r K Series Stainless Steel Single Bowl Undermount Cutout
Description
The Alpha International U322R K Series is a reversed-configuration double bowl undermount sink designed for professional countertop installations where mirror-image bowl orientation is required. This 31.75" x 20.5" stainless steel sink is constructed from commercial-grade T-304 material in 18 gauge thickness with a premium satin finish that resists water spotting and maintains professional appearance. The R designation indicates a reversed bowl arrangement compared to the standard U322 model, providing design flexibility for specific kitchen layouts where plumbing locations or user preferences dictate alternative bowl positioning. Our production-ready DXF template includes four installation variants: no reveal for flush mounting, 1/8" reveal for standard undermount installations with edge tolerance, 1/2" overhang for traditional aesthetics with maximum support, and drop-in configuration for alternative mounting scenarios. The sink features round corners and dual 3.5" drain openings compatible with standard garbage disposals and basket strainers. Minimum cabinet width is 20", though 24-27" cabinets provide optimal installation clearance and support. The K Series designation indicates this model is part of Alpha International's professional line with DXF files optimized for CNC cutting accuracy. This reversed configuration is particularly valuable when fabricating matching kitchen setups or when existing plumbing rough-in requires specific bowl orientation.
Dimensions
- Overall Width
- 31.75"
- Overall Depth
- 20.5"
- Bowl Width
- 17.75"
- Bowl Depth
- 18.5"
Specifications
- Manufacturer
- Alpha International
- Model Number
- U322r K Series
- Installation Type
- Undermount
- Bowl Configuration
- Single
- Material
- Stainless-Steel
- Min. Cabinet Width
- 20"
- Downloads
- 0
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The Alpha International U322R K Series is a reversed-configuration double bowl undermount sink designed for professional countertop installations where mirror-image bowl orientation is required. This 31.75" x 20.5" stainless steel sink is constructed from commercial-grade T-304 material in 18 gauge thickness with a premium satin finish that resists water spotting and maintains professional appearance. The R designation indicates a reversed bowl arrangement compared to the standard U322 model, providing design flexibility for specific kitchen layouts where plumbing locations or user preferences dictate alternative bowl positioning. Our production-ready DXF template includes four installation variants: no reveal for flush mounting, 1/8" reveal for standard undermount installations with edge tolerance, 1/2" overhang for traditional aesthetics with maximum support, and drop-in configuration for alternative mounting scenarios. The sink features round corners and dual 3.5" drain openings compatible with standard garbage disposals and basket strainers. Minimum cabinet width is 20", though 24-27" cabinets provide optimal installation clearance and support. The K Series designation indicates this model is part of Alpha International's professional line with DXF files optimized for CNC cutting accuracy. This reversed configuration is particularly valuable when fabricating matching kitchen setups or when existing plumbing rough-in requires specific bowl orientation.
Installation Overview
Installing the Alpha U322R requires careful attention to bowl orientation since the reversed configuration affects plumbing and user workflow. Before cutting, verify with your client which bowl should align with disposal location and which will serve as the primary washing basin. Position the template on the countertop underside with minimum 3" clearance from all edges to prevent structural weakness. For standard undermount installations, the 1/8" reveal variant provides optimal balance between aesthetics and installation tolerance. The cutout dimensions for this variant are 29.5" x 18.25", which is 0.25" smaller than the bowl interior on each axis. This creates a uniform lip that conceals minor cutting variations while providing clean visual lines. Mark the front edge orientation clearly on your template before transferring to the stone, as reversing the sink 180 degrees will misalign the bowl configuration. The sink ships with mounting clips and a paper template, but our DXF files provide CNC-level precision for professional fabrication workflows. After cutting, test-fit the sink and verify that drain openings align with your plumbing rough-in. Apply a continuous bead of 100% silicone sealant around the cutout perimeter, keeping the bead approximately 1/4" from the cut edge. Position the sink carefully, ensuring proper front-to-back orientation, then secure with mounting clips at 6-8" intervals. Tighten clips gradually in a cross-pattern to distribute stress evenly. Allow silicone to cure 24-48 hours before connecting plumbing and testing with water.
CNC Cutting Notes
The U322R DXF template is provided in decimal inch units with the origin point at the front-left corner of the cutout boundary. The template contains 56 discrete entities including lines, arcs, and annotation text distributed across layers 0, DEFPOINTS, LABEL, and a Chinese character layer for manufacturer reference. When importing to your CAM software, verify that all layers are recognized and that arc interpolation correctly renders the round corner profiles. For granite cutting, use a 1/2" diamond router bit with continuous water cooling to manage heat buildup and prevent thermal micro-fractures. Recommended feed rates are 60-80 IPM for natural granite, 80-100 IPM for engineered quartz, adjusted based on material hardness and density. The no-reveal variant cuts to exact bowl dimensions (29.75" x 18.5" for the interior), leaving zero tolerance for measurement error. For production environments, we recommend the 1/8" reveal variant as it accommodates normal CNC calibration variance and makes installation more forgiving. When programming the toolpath, pay special attention to the orientation of the reversed bowl configuration to ensure the cutout matches your layout drawings. Corner radii are minimal on this model, so inside corners may require relief cuts or a smaller diameter finishing bit to prevent stress concentration points. Ensure vacuum hold-down or clamp positioning doesn't interfere with the cutout path, particularly along the narrow bridge between bowls where support is critical.
Material Compatibility
This template is compatible with granite, engineered quartz, quartzite, marble, solid surface, and ultra-compact surfaces. The large cutout opening (approximately 30" x 18.5" for 1/8" reveal) requires adequate material thickness and reinforcement regardless of material type. For granite installations, we recommend 3cm thickness with steel mesh or plywood support bars bonded beneath the cutout using structural epoxy rated for stone applications. Position support bars perpendicular to the front edge, extending from cabinet frame to 2-3" beyond the rear cutout edge. Engineered quartz offers superior tensile strength compared to natural stone, but reinforcement is still recommended for openings this size. Install undermount clips at 6-8" spacing, bonded to both sink rim and countertop underside with epoxy. For 2cm materials, reinforcement becomes mandatory rather than recommended. Marble is not ideal for kitchen sinks due to acid etching from common foods (citrus, vinegar, wine), but if design requirements dictate marble use, seal all exposed edges with penetrating sealer before and after installation, and educate clients on maintenance requirements. Solid surface materials like Corian can be cut with carbide router bits and bonded directly to the stainless steel rim using manufacturer-approved acrylic adhesives, which create a waterproof seal. For ultra-compact surfaces like Dekton or Neolith, follow manufacturer guidelines for minimum corner radii and edge finishing requirements. The stainless steel construction ensures chemical compatibility with all countertop materials.
Where to Buy
The Alpha International U322R K Series is available through professional kitchen and bath distributors, specialty plumbing supply houses, and online retailers serving the trade market. Fabrication shops can order directly from Alpha International by calling 888-255-2574 or visiting alpha-int.com to locate authorized distributors in your area. The sink typically retails in the $250-$400 range depending on finish options and gauge specifications, offering excellent value for commercial-grade stainless steel construction. When ordering, clearly specify the U322R model (with R designation) to ensure you receive the reversed bowl configuration rather than the standard U322. This is critical as the models appear similar but have mirror-image bowl arrangements. The sink ships with mounting hardware, installation clips, and a paper template, though professional fabricators should use our precision DXF files for CNC accuracy. Lead times vary by supplier but generally range from in-stock to 2-3 weeks for special orders. Alpha International also provides free DXF file downloads from their website technical resources section at alpha-int.com/dxf-files, allowing fabricators to verify dimensions before ordering the physical sink. For clients specifying this model, confirm the exact bowl orientation they prefer and verify that it matches the U322R configuration. The premium satin finish is standard on K Series models.