Key Features

• Corner radius end mills have cutting edges with rounded corners to reduce chipping and provide longer tool life
• 35-degree helix angle provides increased cutting action and chip evacuation compared to lower helix angles for machining stainless steel and titanium
• Three flutes provide better chip-carrying capacity than four flutes and a finer finish than two, reducing the need for a second finishing cut in some applications
• Carbide can run at higher speeds than high-speed or cobalt steel, resisting wear and high cutting temperatures
• Center-cutting design allows the end mill to plunge into material like a drill bit while also performing conventional surface milling

Product Description

The Niagara Cutter S335M uncoated (bright) carbide corner radius metric end mill has three flutes, a 35-degree helix angle, and cutting edges with rounded corners for high-performance cuts on stainless steel, titanium, and high-temperature alloys. Corner radius on cutting edges reduces chipping and extends tool life. The 35-degree helix angle provides more support behind the cutting edge than higher angles, and increases cutting action and chip evacuation compared to lower helix angles. It efficiently cuts difficult-to-machine material such as stainless steel and titanium, moving it up the spiral and away from the workpiece. The end mill’s three flutes provide better chip-carrying capacity than four flutes and a finer finish than two. They remove excess material from the cutting area and provide a third cutting edge to create an improved finish that may eliminate the need for a second finishing cut in some applications. This tool is best suited for slotting.

The carbide substrate is harder than high-speed or cobalt steel, making it more wear resistant at high speeds and providing longer tool life; this tool has no coating or surface treatment. The center-cutting design has cutting teeth at the end of the tool, so it can be fed straight into the workpiece like a drill bit. Cutting diameter tolerance is +0.00 mm to -0.05 mm. The round shank accommodates a range of tool holders.

End mills are designed to remove material and create multi-dimensional shapes and profiles. They have cutting edges along the outside diameter and flutes that remove chips from the cutting area and allow cooling fluids to enter. If heat is not reduced effectively, the tool’s cutting edges will dull and additional material buildup can occur. The number of flutes can range from two to eight. Two-flute designs offer the most efficient chip removal, but more flutes provide a smoother finish. The shank is the end of the tool held in place by a tool holder or machine. Center-cutting end mills can create three-dimensional shapes and profiles, and make plunge cuts similar to a drill bit. Non-center-cutting end mills are for applications such as peripheral milling and finishing, but cannot make plunge cuts.

Niagara Cutter has been designing and manufacturing precision cutting tools since 1954. Specializing in end mills, cutting mills, and saws, the company is based in New York and manufactures its tools at facilities in Pennsylvania and Massachusetts. This allows the company control over production, from substrate to coating, which is essential for customers in a variety of industries, especially aerospace and automotive.