Square End Mill for Carbon Steel Machining up to HRC55 | PEX Series

The Dohre PEX Series square end mill is a solid carbide end mill designed for carbon steel, alloy steel, cast iron, and general steel machining under HRC55.

As a square end mill, it is mainly used for flat surface finishing, bottom surface machining, side milling, shoulder milling, slotting, and step machining. It is a suitable choice when the workpiece requires a clean flat surface, accurate step profile, straight side wall, and stable dimensional control.

With ultra-fine carbide, AlTiN nano composite coating, a 6° positive rake angle, and a 35° helix angle, the PEX square end mill helps reduce cutting resistance, improve chip evacuation, and maintain stable finishing performance in general steel machining.

For stainless steel machining, a dedicated stainless steel end mill series such as TEX is usually more suitable. For HRC60+ hardened steel, HEX or CBN tools should be considered instead.

Ultra-Fine Carbide for HRC55 and Below Materials

The PEX square end mill is made from ultra-fine carbide with 10% cobalt content. This carbide substrate provides a balance of hardness, toughness, and wear resistance for carbon steel, alloy steel, cast iron, and general steel machining.

For finishing and semi-finishing applications, stable carbide quality helps reduce edge wear, maintain dimensional consistency, and support longer tool life.

AlTiN Nano Composite Coating
The tool uses AlTiN nano composite coating to improve wear resistance and heat resistance during steel machining. This coating helps the cutting edge maintain better stability under high cutting temperature and continuous machining conditions.

It is suitable for general steel machining, semi-dry machining, and finishing operations where tool wear control is important.

Square End Geometry for Flat and Step Machining
The square end design is suitable for flat surface finishing, bottom machining, step face machining, shoulder milling, side milling, and slotting.

This geometry is especially useful when the workpiece requires:

•Flat bottom surface

•Clear step profile

•Straight side wall

•Sharp corner definition

•Stable finishing surface

•Accurate part dimension

Compared with a ball nose end mill, the square end mill is more suitable for flat and straight surfaces. Compared with a corner radius end mill, it provides a sharper corner when clear edge definition is required.

6° Positive Rake Angle and 35° Helix Angle
The 6° positive rake angle helps reduce cutting resistance and supports smoother cutting in steel machining. The 35° helix angle helps improve chip evacuation, reduce vibration, and maintain stable cutting performance.

This design makes the tool suitable for finishing and semi-finishing operations where surface quality, cutting stability, and tool life are important.

Stable Performance for General Steel Machining
The combination of ultra-fine carbide, AlTiN nano coating, positive rake angle, and 35° helix angle helps the PEX square end mill perform reliably in HRC55 and below materials.

Suitable materials include carbon steel, mild steel, alloy steel, cast iron, ordinary mold steel, and general steel parts.

Dohre PEX solid carbide square end mills are suitable for general CNC machining, steel finishing, semi-finishing, and stable production machining under HRC55.

Suitable workpiece materials include:

•Carbon steel

•Mild steel

•Alloy steel

•Tool steel under HRC55

•Cast iron

•Ordinary mold steel

•General steel components

Typical industries include mold and die machining, automotive parts machining, general machinery manufacturing, fixture machining, CNC job shops, and batch production of steel parts.

Dohre focuses on stable carbide tool manufacturing, precision grinding, edge consistency, and inspection control. For square end mills, cutting edge quality and dimensional stability directly affect flat surface finish, side-wall accuracy, and tool life.

German Walter 5-Axis Grinding Machines
PEX square end mills are produced using German Walter 5-axis high-precision grinding machines. This helps maintain stable flute geometry, accurate dimensions, and consistent cutting edge quality.

Surface Optimization
Fluid abrasive drag finishing helps reduce burrs and improves smoothness on the cutting edge and flute area. This supports smoother cutting and more stable chip evacuation.

Walter HELICHECK PLUS Inspection
Tool profile, diameter, runout, and key geometry are inspected with Walter HELICHECK PLUS measuring equipment to support consistent batch quality.

High-Magnification Inspection
Each tool can be inspected under high magnification to check cutting edge appearance, chipping, serration, and visible edge defects before shipment.

Q1: What is the PEX square end mill used for?
The PEX square end mill is mainly used for carbon steel, alloy steel, cast iron, and general steel machining under HRC55. It is suitable for flat surface finishing, side milling, shoulder milling, slotting, and step machining.

Q2: Is this a square end mill or a flat end mill?
It can be described as both. “Square end mill” is more common for the tool shape, while “flat end mill” is often used when emphasizing flat-bottom machining.

Q3: What is the difference between a square end mill and a ball nose end mill?
A square end mill is better for flat surfaces, bottom machining, side milling, and step faces. A ball nose end mill is better for curved surfaces, 3D contours, and mold profile machining.

Q4: What is the difference between a square end mill and a corner radius end mill?
A square end mill provides a sharper cutting corner for flat-bottom and step machining. A corner radius end mill provides better corner protection and is more suitable when edge chipping risk is higher.

Q5: Can this end mill machine stainless steel?
It can be used in some general stainless steel conditions, but for dedicated stainless steel machining, a TEX stainless steel end mill is usually more suitable.

Q6: Can this tool machine hardened steel?
This PEX square end mill is mainly recommended for HRC55 and below materials. For HRC60+ hardened steel, HEX or CBN tools are more suitable.

Q7: Is this tool suitable for roughing?
It can be used for light roughing, semi-finishing, and finishing, depending on cutting parameters and machine stability. For heavy roughing, a dedicated roughing end mill is recommended.

Q8: Can Dohre customize PEX square end mills?
Yes. Dohre supports custom carbide end mills, including diameter, flute length, overall length, shank size, flute number, coating, and application-specific geometry.

Q9: Are you a carbide end mill manufacturer?
Yes. Dohre manufactures carbide end mills for carbon steel, stainless steel, aluminum, mold steel, hardened steel, titanium alloy, and custom machining applications.

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