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55 Degree Coated Tungsten Carbide End Mill 4 Flute Flat Bottom CNC End Milling Cutter, Flat End Mill for Machining 45# Steel and Mold Steel

55 Degree Coated Tungsten Carbide End Mill 4 Flute Flat Bottom CNC End Milling Cutter, Flat End Mill for Machining 45# Steel and Mold Steel

55° 4-Flute Carbide Flat End Mill for 45# Steel & Mold Steel

This 55° coated tungsten carbide flat end mill comes with 4 cutting flutes for stable metal cutting. It is mainly developed for machining 45# carbon steel and various mold steel, widely adopted on CNC machining centers for flat surface and side wall milling.

Adopted premium tungsten carbide blank and high-performance coating, this end mill offers high hardness, excellent wear resistance and good anti-chipping property. It maintains sharp cutting edges and reduces friction to extend tool service life during continuous milling.

Ideal for roughing and semi-finishing of steel mold, mechanical fixture and structural steel parts. Suitable for slotting, side milling and plane machining, a universal CNC flat milling tool widely used in mold making and machinery processing workshops.

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Recommended Cutting Parameters for Carbide End Mills

Units: S = Spindle Speed (r/min); F = Feed Rate (mm/min); Ap = Axial Depth of Cut; Ae = Radial Width of Cut

Working Conditions: Adequate flood coolant; Rigid 3-axis / 4-axis machining center; Standard 3D cutting length, 4-flute flat end mill

Roughing: Stock removal; Finishing: Surface finish, corner cleaning, dimensional tolerance & surface roughness

Fine-tuning Rule: Poor machine rigidity / Longer tool overhang → Reduce speed by 20% & feed rate by 30%

Carbon Steel / Alloy Steel (45#, Q235, 40Cr, Cr12, HRC≤42)

Tool Diameter D (mm)	Roughing S/F/Ap/Ae	Finishing S/F/Ap/Ae
φ3	6800/1100/1.5/2.0	9200/750/0.15/0.8
φ4	5600/1300/2.0/2.8	7600/850/0.15/1.0
φ6	3800/1500/3.0/4.0	5200/950/0.20/1.5
φ8	2900/1700/4.0/5.5	3900/1100/0.20/2.0
φ10	2300/1900/5.0/7.0	3100/1200/0.25/2.5
φ12	1900/2100/6.0/8.5	2600/1350/0.25/3.0
φ16	1450/2300/7.0/11.0	1950/1500/0.30/4.0
φ20	1150/2500/8.0/14.0	1550/1650/0.30/5.0

Pre-hardened Mold Steel HRC45–55

Tool Diameter D (mm)	Roughing S/F/Ap/Ae	Finishing S/F/Ap/Ae
φ3	3200/420/0.8/1.2	4300/300/0.10/0.6
φ4	2600/480/1.0/1.6	3500/340/0.10/0.8
φ6	1750/550/1.5/2.4	2400/380/0.12/1.2
φ8	1350/620/2.0/3.2	1850/420/0.12/1.6
φ10	1080/680/2.5/4.0	1480/460/0.15/2.0
φ12	890/740/3.0/4.8	1220/500/0.15/2.4
φ16	680/800/3.5/6.4	920/540/0.18/3.2
φ20	540/860/4.0/8.0	730/580/0.18/4.0

General Machining Notes

If tool overhang > 3×cutting length, reduce all parameters by 30% to avoid chatter and chipping.

Reduce feed rate by half for thin-wall finishing to minimize workpiece deformation.

For older 2-axis milling machines / engraving machines with limited max spindle speed, reduce feed rate synchronously.

When machining HRC45–55 pre-hardened mold steel, use the lower limit of parameters for stainless steel.

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Boiling cutters, milling cutters, CNC inserts, grooving inserts, reamers, tool holders, tool sleeves, and other industrial machinery and equipment.

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Wenqiao Sanqiang CNC Tools Co., Ltd., established in 2011, is located in Wenling, Taizhou, China, covering an area of 10 mu (approximately 6,667 square meters). We specialize in high-quality CNC cutting tools, including CNC carbide inserts, carbide end mills, and turning tool fixtures. Our quality speaks for itself, resulting in a high customer repurchase rate and numerous positive reviews.

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