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Alpha Ultracut GPM Series Multi-Material Diamond Blades
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At a Glance
Quick Decision Guide
Blade Diameter
4"
Blade Thickness
1.5 mm
Maximum RPM
14,500 RPM
Arbors
20 mm & 5/8"
Primary Use
Metal & Multi-Material Cutting
Tool Compatibility
Hand-Held Electric Power Tools
Metal Cutting
Steel, Rebar, Pipe, Conduit & More
Other Materials
Stone, Masonry, Wood, Plastics & Composites
Why Choose This Product
Key Benefits
Multi-Material Cutting
Cuts metal, stone, masonry, wood, plastics and composite materials
Long-Lasting Performance
Maintains cutting performance at maximum depth throughout blade life
Broad Tool Compatibility
Works with compatible grinders, stone cutters, circular saws and worm-drive saws
Metal Cutting Capability
Cuts structural metal, stainless steel, rebar, pipe, conduit and sheet metal
Roofing Applications
Cuts galvanized steel sheets and coated metal roofing materials
Fewer Blade Changes
Broad material capability reduces the need to switch blades between applications
Product Information
Product Details
Specifications
Brand
Alpha®
Part Number
GPM0420
UPC
749173610066
Product Type
Multi-Material Diamond Blade
Series
Ultracut GPM
Blade Diameter
4"
Blade Thickness
1.5 mm
Maximum RPM
14,500 RPM
Arbors
20 mm & 5/8"
Primary Application
Metal & Multi-Material Cutting
Tool Compatibility
Angle Grinders, Stone Cutters, Circular Saws & Worm-Drive Saws
Metal Materials
Angle Iron, Pipe, Electrical Conduit, Rebar, Metal Studs, Structural Metal, Sheet Metal, Grid & Stainless Steel
Roofing Materials
Galvanized Steel Roofing Sheets & Corrugated Granite-Granule-Coated Metal Roof Tile
Stone Materials
Marble, Limestone & Engineered Stone/Quartz Surfaces
Additional Materials
Wood, Plastics, Composite Materials, Masonry & Concrete
Cutting Performance
Maintains Cutting Performance at Maximum Cutting Depth Throughout Blade Life
About This Product
Diamond Blades for Metal and Composite Materials
The Alpha® Ultracut GPM Series is a high-performance diamond blade designed for building contractors and fabricators cutting metal, composite materials, and other demanding materials. The blade maintains excellent cutting performance at maximum cutting depth throughout its service life, reducing blade changes across varied cutting applications.
Metal, Masonry, Stone and Composite Cutting
The Ultracut GPM Series cuts angle iron, pipe, electrical conduit, rebar, metal studs, structural metal, sheet metal, grid, stainless steel, wood, plastics, composite materials, masonry, and concrete. It can also cut marble, limestone, and engineered stone and quartz surfaces, providing one blade for a broad range of jobsite and fabrication materials.
Galvanized Steel and Metal Roofing Applications
For roofing applications, the GPM Series can cut galvanized steel roofing sheets and corrugated granite-granule-coated metal roof tile. It provides an alternative to carbide blades where carbide tip loss, compression marks, and burning of painted surfaces can create problems during demanding metal cuts.
Compatibility with Hand-Held Power Tools
The GPM Series is designed for use with popular hand-held electric power tools, including angle grinders, stone cutters, circular saws, and worm-drive saws. Available 4" and 4-1/2" blade configurations provide arbor options and maximum RPM ratings suited to compatible tools.
Product Resources
Documentation & Downloads
Common Questions
Frequently Asked Questions
What materials can the Alpha Ultracut GPM Series cut?
The GPM Series can cut angle iron, pipe, electrical conduit, rebar, metal studs, structural metal, sheet metal, grid, stainless steel, galvanized steel roofing, wood, plastics, composite materials, marble, limestone, engineered stone and quartz surfaces, masonry, and concrete.
What power tools can be used with Ultracut GPM blades?
The blades are designed for compatible hand-held electric power tools including angle grinders, stone cutters, circular saws, and worm-drive saws. Always verify blade diameter, arbor, and maximum RPM compatibility with the tool before use.
Can the Ultracut GPM Series cut metal roofing?
Yes. The GPM Series can cut galvanized steel roofing sheets and corrugated granite-granule-coated metal roof tile.
Can the Ultracut GPM Series cut stainless steel and structural metal?
Yes. The listed applications include stainless steel, structural metal, angle iron, pipe, rebar, electrical conduit, metal studs, sheet metal, and grid.
Can these blades cut stone and concrete?
Yes. The GPM Series is suitable for marble, limestone, engineered stone and quartz surfaces, masonry, and concrete in addition to its metal-cutting applications.
What is the difference between GPM0420 and GPM4578?
GPM0420 is a 4" blade rated for up to 14,500 RPM with 20 mm and 5/8" arbor options. GPM4578 is a 4-1/2" blade rated for up to 13,200 RPM with 7/8" and 20 mm arbor options. Both blades are 1.5 mm thick.