American Standard 20SB331100 Portsmouth 33 Single Sink Cutout
Description
The American Standard Portsmouth 20SB331100 combines generous single bowl capacity with a space-efficient 33-inch by 18-inch overall footprint. Engineered for professional undermount installation in natural stone, quartz, and engineered surfaces, this stainless steel sink template delivers precision DXF cutting patterns for countertop fabricators demanding accuracy and reliability. The Portsmouth collection emphasizes clean, functional design with ADA-compliant specifications making it suitable for accessible residential and commercial kitchens. This template package provides four distinct installation variants calculated to support different reveal requirements and countertop material properties. The single bowl configuration maximizes usable sink capacity within the compact 33-inch width, accommodating large pots, baking sheets, and oversized cookware while fitting comfortably in standard 36-inch base cabinets. Each variant has been engineered to maintain structural integrity and proper support distribution, ensuring long-term installation success across diverse project types and material specifications commonly encountered in modern countertop fabrication.
Dimensions
- Overall Width
- 33"
- Overall Depth
- 18"
- Bowl Width
- 31"
- Bowl Depth
- 16"
- Corner Radius
- 0.375"
Specifications
- Manufacturer
- American Standard
- Model Number
- 20SB331100
- Installation Type
- Undermount
- Bowl Configuration
- Single
- Material
- Stainless-Steel
- Min. Cabinet Width
- 36"
- Downloads
- 0
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The American Standard Portsmouth 20SB331100 combines generous single bowl capacity with a space-efficient 33-inch by 18-inch overall footprint. Engineered for professional undermount installation in natural stone, quartz, and engineered surfaces, this stainless steel sink template delivers precision DXF cutting patterns for countertop fabricators demanding accuracy and reliability. The Portsmouth collection emphasizes clean, functional design with ADA-compliant specifications making it suitable for accessible residential and commercial kitchens. This template package provides four distinct installation variants calculated to support different reveal requirements and countertop material properties. The single bowl configuration maximizes usable sink capacity within the compact 33-inch width, accommodating large pots, baking sheets, and oversized cookware while fitting comfortably in standard 36-inch base cabinets. Each variant has been engineered to maintain structural integrity and proper support distribution, ensuring long-term installation success across diverse project types and material specifications commonly encountered in modern countertop fabrication.
Installation Overview
Successful installation of the American Standard Portsmouth 20SB331100 requires understanding single bowl support dynamics and proper weight distribution. The 33-inch by 18-inch overall dimension provides generous bowl capacity while fitting standard 36-inch sink base cabinets with adequate clearance for plumbing and mounting hardware. This template offers four installation configurations: no-reveal for contemporary flush-mount aesthetics, 1/8-inch reveal for traditional undermount specifications, 1/2-inch overhang for maximum material support in natural stone applications, and drop-in variant for alternative mounting methods. When selecting your variant, consider material density, slab thickness, and expected sink usage patterns. The single bowl design concentrates weight in one location, making proper support critical for long-term stability. For 3cm granite and quartzite installations, the 1/2-inch overhang variant maximizes material contact around the sink perimeter, distributing weight effectively and preventing sagging over time. Quartz countertops typically perform well with the 1/8-inch reveal, which balances clean aesthetics with adequate structural support. The 18-inch front-to-back depth suits installations where counter space is at a premium while still providing adequate bowl depth for kitchen tasks. Install undermount clips every 6-8 inches around the entire perimeter, with additional support at front corners where cantilever stress is highest. The Portsmouth's ADA-compliant bowl depth facilitates access for users with mobility limitations while maintaining capacity for standard residential use.
CNC Cutting Notes
CNC programming for the Portsmouth 20SB331100 demands precision corner radius execution and clean edge finishing for optimal installation results. Utilize a 3/8-inch or 1/2-inch upcut spiral bit with carbide or diamond coating appropriate for your countertop material. The 0.375-inch corner radius requires smooth toolpath transitions with gradual arc programming to eliminate stress concentration points that could cause cracking during installation or thermal cycling. Set feed rates between 80-120 inches per minute for standard granite and quartz materials, reducing to 60-80 IPM for dense quartzite or exotic stones with high silica content. Execute plunge operations in multiple passes rather than single-pass full-depth cuts: rough at 0.25-inch depth increments to remove bulk material quickly, then finish with a 0.125-inch pass to achieve smooth, precise edges suitable for undermount installations. The 1/8-inch reveal variant requires exceptional dimensional accuracy as small variations accumulate around the perimeter and affect sink fit; ensure your CNC is properly calibrated and compensate for bit deflection by running test cuts on scrap material. Water cooling is essential when cutting engineered quartz to prevent resin matrix damage from heat buildup and reduce airborne crystalline silica dust that poses respiratory hazards. After CNC cutting completes, finish all exposed edges with progressive diamond polishing: begin with 50-grit pads for initial smoothing and scratch removal, progress through 120-grit for edge refinement, and complete with 220-grit or finer for polished finish quality that matches your countertop surface standards and provides professional installation aesthetics.
Material Compatibility
This Portsmouth single bowl template supports all standard countertop materials used in residential and commercial fabrication projects. Natural granite provides excellent inherent strength for single bowl installations, with the material's density and compression resistance easily supporting the concentrated weight of a filled sink. The 1/8-inch reveal works well for 3cm granite slabs, while 2cm granite should use the 1/2-inch overhang variant combined with additional undermount clips and possible plywood substrate for long-term stability. Quartzite installations demand careful planning due to material brittleness and tendency toward micro-fracturing under sustained stress; always specify the 1/2-inch overhang variant for quartzite and educate clients about proper sink usage to prevent impact damage. Engineered quartz including brands like Cambria, Caesarstone, Silestone, and Hanstone performs excellently with this template, as the materials' consistent composition and polyester resin binder create strong, stable edges that support undermount sinks effectively with minimal deflection over time. The 1/8-inch reveal is most common for quartz installations, providing optimal balance between aesthetic appeal and structural support requirements. Marble requires the 1/2-inch overhang variant due to its softer composition and vulnerability to stress cracking; additionally, educate clients about marble's maintenance requirements around sink areas including susceptibility to etching from acidic foods and cleaning products. Solid surface materials including Corian, Hi-Macs, and Staron can accommodate any template variant, though fabricators typically prefer the 1/8-inch reveal due to these materials' flexibility and excellent adhesion properties with silicone and epoxy bonding systems. For ultra-compact surfaces like Dekton, Neolith, or Lapitec, consult material manufacturer specifications for undermount sink support requirements, as these materials have unique thermal and structural properties that may require specialized installation hardware or substrate reinforcement beyond standard practices.
Where to Buy
The American Standard Portsmouth 20SB331100 is available through professional plumbing supply distributors and select retail channels serving trade and consumer markets. Ferguson showrooms maintain American Standard Portsmouth inventory for trade account holders, offering contractor pricing typically in the $500-$700 range depending on regional market conditions and volume purchasing agreements. F.W. Webb Company provides similar trade access for established plumbing professionals with active accounts. Online availability for this specific model number may be limited; verify exact specifications including bowl configuration and overall dimensions before ordering, as American Standard's Portsmouth product line includes numerous similar models with slight dimensional variations. For fabricators maintaining sink inventory for spec homes, production builders, or quick-turn residential remodels, contact American Standard's commercial sales division to establish direct ordering relationships with volume pricing and job-site delivery options. When ordering, specify the complete model number including all suffix codes (20SB.331100.075) and verify bowl configuration, dimensions, and included accessories match your project requirements. Request manufacturer specification sheets and installation documentation to verify dimensions align precisely with your DXF template before cutting expensive countertop materials. American Standard provides limited lifetime warranty coverage on Portsmouth series sinks when purchased through authorized dealers; maintain purchase documentation for warranty registration and future client service needs. Most suppliers can fulfill standard model orders within 5-7 business days, though confirm availability for this specific 33x18 single bowl configuration as it may not be maintained as stocked inventory at all distribution locations.