Exterior Interior
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C650 Ultra™ Series Windows
Radius Windows

Material
Fiberglass
Price point
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Project type
Replacement, New Construction

C650 Ultra Series radius windows come in operable or inoperable styles. What sets them apart is the curved feature, which can be a simple arched top or even a circular window shape. A beautiful and elegant option, radius windows can also have grids added. 

Design Options

FRAME COLOR

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Interior
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Interior
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Interior
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Exterior
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Exterior

Interior frame color

White
Harmony
Harmony
Bark
Black Bean

Exterior frame color

Frost
Harmony
Harmony
Bark
Black Bean

Finish options may vary by location. 
Colors shown are approximate. Visit your local Milgard Dealer for more information and to see accurate finish samples. 

GLASS OPTIONS

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Solar Bronze Tinted Glass
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Solar Gray Tinted Glass
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Aquatex Obscure Glass Option
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Glue Chip Obscure Glass Option
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Standard
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Milgard SunCoat® Low-E2 Glass comes standard on all dual-pane windows and patio doors.

Tinted glass options

Cardinal Low-E
Solar Bronze Tinted Glass
Solar Bronze
Solar Gray Tinted Glass
Solar Gray

Obscure glass options

#42 Clear
Aquatex Obscure Glass Option
Aquatex
Delta Frost
Frosted Glue Chip
Glue Chip
Satin Etch
Narrow Reed
P516
Rain

GRIDS

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Flat Grid

Grid is located between the glass.

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Sculptured Grid (inside Glass)
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3/4" Vintage Simulated Divided Lite (SDL)

Grid is overlayed on the glass to simulate a divided lite.

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1-1/8" Craftsman Simulated Divided Lite (SDL)

Grid is overlayed on the glass to simulate a divided lite.

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1-1/8" Vintage Simulated Divided Lite (SDL)

Grid is overlayed on the glass to simulate a divided lite.

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1-1/8" Legacy Simulated Divided Lite (SDL)

Grid is overlayed on the glass to simulate a divided lite.

Grid style

Express your creativity and increase your home's curb appeal with a variety of grid options.

Grid style

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Flat Grid
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Sculptured Grid (inside Glass)
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3/4" Vintage Simulated Divided Lite (SDL)
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1-1/8" Craftsman Simulated Divided Lite (SDL)
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1-1/8" Vintage Simulated Divided Lite (SDL)
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1-1/8" Legacy Simulated Divided Lite (SDL)

Grid pattern

The grid patterns shown below are common configurations, however we can accommodate nearly any desired grid pattern.

Grid pattern

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Standard
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Standard Half
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Valance
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Perimeter Pane
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Perimeter Corner

Our Experts are Here to Help! 

Durable & Energy Efficient

C650 Ultra Series fiberglass windows are heat and cold resistant, durable and low-maintenance. The frame expands and contracts at approximately the same rate as the insulated glass it holds, putting less stress on the seals for a clear view. 

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Technical Resources

All Resources

MITER Brands Field Testing Policy
Fastener Schedule
Ultra Series Performance Ratings
Ultra Series Windows 3-Part Specification
C650 Ultra Series Thermal Ratings
Ultra™ Series | C650 STC Ratings
Ultra Series Min/Max Sizes
Ultra Series Radius, 2 Lites Wide: Block frame, 3 1/4" Wall
Ultra Series Radius: Block frame, 3 1/4" Wall
Ultra Series Radius: Block frame, 4 1/4" Wall
Reviews
Radius Windows