American Standard 20DB331100 Portsmouth 33 Double Sink Cutout
Description
The American Standard Portsmouth 20DB331100 delivers professional-grade double bowl functionality in a compact 33-inch by 18-inch footprint. Designed for undermount installation in granite, quartz, and solid surface countertops, this stainless steel sink template provides precision DXF patterns for countertop fabricators seeking reliable, production-ready cutting files. The Portsmouth series emphasizes clean lines, functional design, and ADA-compliant bowl depth specifications suitable for accessible kitchen installations. This template package includes four installation variants engineered to accommodate different reveal requirements and material support needs. The double bowl configuration offers versatility for kitchen workflows, allowing simultaneous food prep and cleanup operations while maintaining a relatively compact overall size that fits standard 36-inch sink base cabinets. Each template variant has been calculated to maintain proper structural support while providing the installation flexibility required for diverse project specifications and countertop material properties.
Dimensions
- Overall Width
- 33"
- Overall Depth
- 18"
- Bowl Width
- 31"
- Bowl Depth
- 16"
- Corner Radius
- 0.375"
Specifications
- Manufacturer
- American Standard
- Model Number
- 20DB331100
- Installation Type
- Undermount
- Bowl Configuration
- Double
- Material
- Stainless-Steel
- Min. Cabinet Width
- 36"
- Downloads
- 0
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The American Standard Portsmouth 20DB331100 delivers professional-grade double bowl functionality in a compact 33-inch by 18-inch footprint. Designed for undermount installation in granite, quartz, and solid surface countertops, this stainless steel sink template provides precision DXF patterns for countertop fabricators seeking reliable, production-ready cutting files. The Portsmouth series emphasizes clean lines, functional design, and ADA-compliant bowl depth specifications suitable for accessible kitchen installations. This template package includes four installation variants engineered to accommodate different reveal requirements and material support needs. The double bowl configuration offers versatility for kitchen workflows, allowing simultaneous food prep and cleanup operations while maintaining a relatively compact overall size that fits standard 36-inch sink base cabinets. Each template variant has been calculated to maintain proper structural support while providing the installation flexibility required for diverse project specifications and countertop material properties.
Installation Overview
Installing the American Standard Portsmouth 20DB331100 requires careful planning for double bowl weight distribution and support. With an overall dimension of 33 inches wide by 18 inches deep, this sink fits comfortably in standard 36-inch base cabinets while providing two functional bowls for kitchen tasks. The template offers four variants: no-reveal for flush-mount modern aesthetics, 1/8-inch reveal for standard undermount practice, 1/2-inch overhang for maximum material support in natural stone, and drop-in configuration for alternative mounting. When working with the double bowl design, pay special attention to the center divider area, which requires adequate material thickness to prevent stress fractures between the bowls. For 3cm granite and quartzite, the 1/2-inch overhang variant provides optimal long-term support by maximizing material contact around both bowl perimeters and the center divider. The 18-inch depth makes this sink ideal for installations where front-to-back counter space is limited, though ensure adequate clearance from the backsplash for faucet installation and daily use. Undermount clips should be installed every 6-8 inches around the entire perimeter, with additional clips at the front corners where cantilever stress is highest. The Portsmouth's ADA-compliant bowl depth simplifies access for users with mobility restrictions while maintaining adequate capacity for standard kitchen tasks.
CNC Cutting Notes
CNC programming for the Portsmouth 20DB331100 requires special attention to the double bowl configuration and center divider integrity. Use a 3/8-inch or 1/2-inch upcut spiral bit with carbide or diamond coating appropriate for your material type. The 0.375-inch corner radius at all four corners and around each bowl requires smooth arc transitions in your toolpath to prevent stress concentration points. For double bowl templates, program your CNC to cut both bowls in a single continuous operation when possible, rather than cutting each bowl separately, to maintain consistent dimensional accuracy across the template. Set feed rates between 80-120 IPM for granite and quartz, reducing to 60-80 IPM for quartzite and other dense materials. The center divider between bowls is a critical structural element that requires careful handling; ensure this area has sufficient width (typically 1.5-2 inches minimum) to prevent cracking during cutting or subsequent sink installation. Execute plunge cuts in multiple passes: rough at 0.25-inch increments, then finish with a 0.125-inch pass for smooth edges. Pay particular attention to the center divider when using the 1/8-inch and 1/2-inch reveal variants, as these reduce the overall cutout size and increase material support. Apply continuous water cooling when cutting quartz to prevent resin burn and extend bit life. After CNC cutting, finish all edges with progressive diamond polishing pads: 50-grit, 120-grit, and 220-grit minimum for professional results.
Material Compatibility
This Portsmouth double bowl template is compatible with all standard countertop materials, though material selection significantly impacts the recommended variant choice. Natural granite provides excellent structural support for double bowl installations, with the material's inherent strength easily supporting the divided cutout configuration. The 1/8-inch reveal works well for 3cm granite, while 2cm granite should use the 1/2-inch overhang for additional support. Quartzite installations demand careful consideration due to the material's brittleness; always use the 1/2-inch overhang variant and ensure the center divider between bowls is at least 2 inches wide to prevent micro-fractures. Engineered quartz like Cambria, Caesarstone, and Silestone performs excellently with this template, as the material's consistent composition and resin binder create strong, stable edges. The 1/8-inch reveal is most common for quartz installations, balancing aesthetic appeal with structural requirements. Marble requires the 1/2-inch overhang variant due to its softer composition and susceptibility to stress cracking, particularly in the center divider area between bowls. Solid surface materials including Corian work well with any variant, though fabricators typically prefer the 1/8-inch reveal for these installations. For thin porcelain slabs or ultra-compact surfaces, consult material manufacturer specifications for undermount support requirements, as these materials may need specialized mounting hardware or substrate reinforcement. Always reinforce the center divider area with epoxy or fiberglass backing regardless of material type, as this is the highest-stress zone in double bowl configurations.
Where to Buy
The American Standard Portsmouth 20DB331100 is available through professional plumbing supply distributors and select retail channels. Ferguson locations stock American Standard Portsmouth series sinks for trade accounts, offering contractor pricing typically in the $600-$800 range depending on market and volume. F.W. Webb Company provides similar trade access for established plumbing professionals. Online retailers may have limited availability for this specific model number; verify exact specifications before ordering as Portsmouth model numbers can be confusing with similar size variants in the product line. For fabricators requiring multiple units or maintaining inventory for production builders, contact American Standard's commercial sales division to establish direct ordering relationships and volume pricing. When ordering, verify the complete model number (20DB.331100.075) and confirm bowl configuration, overall dimensions, and included accessories. Request manufacturer specification sheets to verify dimensions match your template before cutting, as model number variations within the Portsmouth line can indicate different bowl configurations or sizes. American Standard provides limited lifetime warranty coverage on Portsmouth series sinks when purchased through authorized dealers. Most suppliers can provide standard models within 5-7 business days, though confirm availability for this specific 33x18 double bowl configuration as it may not be stocked inventory at all locations.