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Niagara Cutter A337 High Speed Steel (HSS) Square Nose End Mills, Inch, Weldon Shank, TiCN Finish, Finishing Cut, 37 Degree Helix, For Use With Aluminum

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Product Specifications
Manufacturer Series Number
Cutting Direction
Right Hand
Compatible Material
Finish Types
End Cut Type
Center Cutting
Shank Type
Material Type
High Speed Steel (HSS)
Cut Type
Cutting Angle
37  Degrees
Brand Name
Niagara Cutter
System of Measurement

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Cutting Diameter Shank Width Cutting Length Overall Length Number of Flutes Mfr Part # ASIN

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3/16 " 3/8" 0.500" 2.375" 3 33802 B00075NKQO 1 $21.62 Buy Options
1/4" 3/8" 1.25" 3.0625" 3 33811 B00075NKS2 1 $24.85 Buy Options
1/4" 3/8" 0.375" 2.1875" 3 33805 B00075NKQY 1 $24.10 Buy Options
1/4" 3/8" 0.625" 2.4375" 3 33808 B00075NKR8 1 $21.62 Buy Options
1/4" 3/8" 1.75" 3.5625" 3 33814 B00075NKSC 1 $25.80 Buy Options
5/16" 3/8" 2" 3.75" 3 33826 B00075NKTQ 1 $25.80 Buy Options
5/16" 3/8" 1.375" 3.125" 3 33823 B00075NKTG 1 $23.37 Buy Options
5/16" 3/8" 0.75" 2.5" 3 33820 B00075NKSW 1 $21.46 Buy Options
5/16" 3/8" 0.375" 2.125" 3 33817 B00075NKSM 1 $22.11 Buy Options
3/8 " 3/8" 0.375" 2.125" 3 33829 B00075NLFY 1 $24.88 Buy Options
3/8 " 3/8" 0.75" 2.5" 3 33832 B00075NLGI 1 $20.99 Buy Options
3/8 " 3/8" 1.5" 3.25" 3 33835 B00075NLHM 2 $24.54 Buy Options
3/8 " 3/8" 2.500" 4.25" 3 33838 B00075NLHW Usually ships in 1 to 4 months $27.86 Buy Options
7/16" 1/2" 2.750" 4.75" 3 33850 B00075NKX2 1 $33.10 Buy Options
7/16" 1/2" 1.250" 3.25" 3 33844 B00075NKW8 2 $26.91 Buy Options
7/16" 1/2" 1.750" 3.75" 3 33847 B00075NKWI 1 $33.33 Buy Options
7/16" 1/2" 0.500" 2.5" 3 33841 B00075NLIG 1 $23.18 Buy Options
1/2 " 1/2" 0.5" 2.5" 3 33853 B00075NKXC 1 $24.34 Buy Options
1/2 " 1/2" 1.25" 3.25" 3 33856 B00075NKXM 2 $26.17 Buy Options
1/2 " 1/2" 2" 4" 3 33859 B00075G3D6 1 $25.28 Buy Options

Key Features

  • 37-degree helix provides efficient chip evacuation required to machine aluminum and other nonferrous materials
  • Three flutes provide a finer finish than two flutes, reducing the need for a second finishing cut in some applications
  • Rounded area behind the cutting edge (cylindrical land) stabilizes the tool in the cut and leaves a smooth finish on the workpiece
  • Low surface-roughness on the cutting edge reduces friction and prevents chips from sticking to the tool
  • Titanium carbon nitride (TiCN) coating lubricates the end mill for high-temperature stability and offers the abrasion resistance required to machine aluminum and other nonferrous materials

Product Description

The Niagara Cutter A337 TiCN-coated high-speed steel square nose end mill has three flutes and a 37-degree helix for milling aluminum and other non-ferrous materials. The 37-degree helix angle gives more support behind the cutting edge than higher angles and offers increased cutting action and chip evacuation compared to the conventional 30-degree helix. It efficiently cuts aluminum and other non-ferrous material, moving material up the spiral and away from the workpiece. The end mill’s three flutes 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. The rounded area behind the cutting edge, called the cylindrical land, stabilizes the tool and smoothes the surface of the workpiece, minimizing tool vibration (chatter) when machining non-ferrous materials. The cutting edge is treated with extra grinding passes, minimizing surface roughness and creating a low-friction surface on the cutting edge to help prevent chips from sticking to the tool.

The TiCN coating offers the increased hardness and abrasion resistance required to machine aluminum and other nonferrous materials, providing more abrasion resistance than TiN coating. High-speed steel (HSS) is a common, general-purpose steel for cutting tools and is compatible with a variety of materials. The tool’s square end creates sharp, unrounded cuts. The center-cutting design has cutting teeth at the end of the tool, so it can be fed into the workpiece like a drill bit. The tool has an eccentric primary relief feature that provides better support behind the cutting edge than a flat relief, reducing tooth breakage in deep cuts. Cutting diameter tolerance is +0.001" to -0.000". The tool has a Weldon shank.

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.

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