HRC65 Mold Steel End Mill【4 Flutes Φ1-20】

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Home » Square End Mill » HRC65 Flat End Mill【4 Flutes Φ1-20】

End mill application: high-quality carbide material, with high wear resistance and heat resistance, suitable for processing heat-treated steel, pre-hardened steel, etc.

End mill performance: with high efficiency and high load processing, to meet the medium and large mold finishing and roughing.

End mill customization: can customize non-standard end mills, such as 6 flutes end mills.

Engineered for Hardened Steels up to 65HRC – Exceptional Wear Resistance and Toughness
Crafted from premium carbide and coated with advanced high-performance layers, this end mill offers superior wear resistance and edge durability in hardened tool steels. Designed for long uninterrupted runs in demanding applications like mold making and high-precision part machining.
4-Flute Design for Higher Metal Removal Rates and Smoother Finishes
Compared to 2-flute tools, the 4-flute geometry provides more cutting edges, improving chip load distribution and reducing tool deflection. This results in higher productivity, better surface quality, and enhanced performance in finishing and medium-depth cuts on hard materials.
High Red Hardness Coating – Reliable in High-Speed and Low-Lubrication Machining
The tool features a heat-resistant coating that maintains cutting edge integrity at elevated temperatures, making it ideal for dry or minimal-lubrication machining. It meets the needs of modern, eco-friendly, and high-efficiency CNC operations.
Application-Specific Cutting Data Included – Maximize Performance and Stability
Each tool comes with optimized cutting parameters for 65HRC steel, including speed, feed rate, and depth of cut. This allows users to quickly set up efficient machining strategies, reduce trial-and-error, and improve overall productivity.
Versatile for Mold Making, Aerospace, and Medical Part Machining
Well-suited for finishing hardened steels and machining tight-tolerance features, this tool is a reliable choice across industries requiring precision and durability—including aerospace components, aluminum molds, and medical device parts.

Highly Recommend for Machining

Specialty

Total 32 Models-Unit(Mm)

Model Number	Outside Diameter	Length Of Cut	Effective Length	Bta Shank Taper Angle	Overall Length	Number Of Flutes	Shank Diameter	In Stock
SHGS4-0100300	1.0	3	–	12°	50	4	4	○
SHGS4-0150450	1.5	4.5	–	12°	50	4	4	○
SHGS4-0200600	2.0	6	–	12°	50	4	4	○
SHGS4-0250600	2.5	6	–	12°	50	4	4	○
SHGS4-0300800-3	3	8	–	–	50	4	3	○
SHGS4-0300800-4	3	8	–	12°	50	4	4	○
SHGS4-0300800-6	3	8	–	12°	50	4	6	○
SHGS4-0401000-4	4	10	–	–	50	4	4	○
SHGS4-0401000-6	4	10	–	12°	60	4	6	○
SHGS4-0401000-75	4	10	–	–	75	4	4	○
SHGS4-0501300	5	13	–	12°	60	4	6	○
SHGS4-0601500	6	15	–	–	60	4	6	○
SHGS4-0601500-75	6	15	–	–	75	4	6	○
SHGS4-0601500-100	6	15	–	–	100	4	6	○
SHGS4-0802000	8	20	–	–	60	4	8	○
SHGS4-0802000-75	8	20	–	–	75	4	8	○
SHGS4-0802000-100	8	20	–	–	100	4	8	○
SHGS4-0802000-150	8	20	–	–	150	4	8	○
SHGS4-1002500	10	25	–	–	75	4	10	○
SHGS4-1002500-100	10	25	–	–	100	4	10	○
SHGS4-1002500-150	10	25	–	–	150	4	10	○
SHGS4-1203000	12	30	–	–	75	4	12	○
SHGS4-1203000-100	12	30	–	–	100	4	12	○
SHGS4-1203000-150	12	30	–	–	150	4	12	○
SHGS4-1403500-100	14	35	–	–	100	4	14	○
SHGS4-1403500-150	14	35	–	–	150	4	14	○
SHGS4-1604000-100	16	40	–	–	100	4	16	○
SHGS4-1604000-150	16	40	–	–	150	4	16	○
SHGS4-1804500-100	18	45	–	–	100	4	18	○
SHGS4-1804500-150	18	45	–	–	150	4	18	○
SHGS4-2005000-100	20	50	–	–	100	4	20	○
SHGS4-2005000-150	20	50	–	–	150	4	20	○

SHGS4 Milling Parameters

Side Milling

Work Material	HRC30-45 Prehardened Steels	HRC30-45 Prehardened Steels	HRC45-55 Hardened Steels	HRC45-55 Hardened Steels	HRC55-65 Hardened Steels	HRC55-65 Hardened Steels
(mm) Diameter	(min-1) Speed	(mm/min) Feed	(min-1) Speed	(mm/min) Feed	(min-1) Speed	(mm/min) Feed
D1.0	10000	100	8000	60	7000	40
D1.5	8000	120	6000	60	5000	50
D2.0	6000	150	4500	80	4000	55
D2.5	5000	150	4000	80	3500	55
D3	5000	150	4000	80	3000	60
D4	4000	200	3000	150	3000	120
D5	3500	300	3000	200	2500	150
D6	3500	300	3000	200	2500	150
D8	3000	300	2500	200	2000	200
D10	2500	300	2500	200	2000	200
D12	2000	250	2000	200	2000	200
D14	2000	350	2000	300	1800	200
D16	1800	350	1800	300	1600	200
D18	1600	350	1600	300	1400	200
D20	1200	350	1200	300	1200	150

Milling Amountfor Side Milling(mm)

Work Material	2.5D (Length of Cut = Diameter * 2.5)	4D (Length of Cut = Diameter * 4)
Below 45HRC	ae = 0.07D ap = 2D	ae = 0.07D ap = 2D
Above 45HRC	ae = 0.03D ap = 1.5D	ae = 0.03D ap = 1.5D

D：Diameter (mm)
ap：Axial Depth (mm)
ae：Radial Depth (mm)

Contour Milling Parameters

Work Material	HRC30-45 Prehardened Steels	HRC30-45 Prehardened Steels	HRC45-55 Hardened Steels	HRC45-55 Hardened Steels	HRC55-65 Hardened Steels	HRC55-65 Hardened Steels
(mm) Diameter	(min-1) Speed	(mm/min) Feed	(min-1) Speed	(mm/min) Feed	(min-1) Speed	(mm/min) Feed
D1.0	13000	1000	13000	1000	8000	300
D1.5	13000	1200	13000	1200	8000	300
D2.0	12000	1500	12000	1500	8000	500
D2.5	12000	1500	12000	1500	8000	800
D3	11000	1800	11000	1800	8000	1000
D4	10000	2200	10000	2200	7500	1200
D5	9000	2500	9000	2500	7000	1500
D6	9000	2500	9000	2500	7000	1500
D8	8000	2500	8000	2500	6000	1800
D10	7000	2500	7000	2500	5500	1800
D12	6000	2500	6000	2500	5000	2000
D14	4000	2200	4000	2200	4000	2200
D16	3500	2200	3500	2200	3500	2200
D18	3000	2000	3000	2000	3000	2000
D20	2500	2000	2500	2000	2500	2000

Note:

*Decrease both spindle speed and feed rate proportionally when the milling parameters exceed the machine’s maximum

spindle speed;

*Recommend oil coolant for Stainless Steels and Heat Resistance Alloys;

*Recommend using a non-contact measuring device to avoid damaging the precision tip point;

*Decrease both spindle speed and feed rate proportionally in case of chattering.

Why Global Buyers Choose SAMHO 4 Flute Flat End Mills

High-Rigidity Design for High-Hardness Steel (HRC48–62 Stable Machining)

The SAMHO 4 flute flat end mill is engineered for stable machining of high-hardness steels. It performs consistently in HRC48–62 mold steels such as SKD11, H13, and D2.

This tool is widely recognized as a high rigidity end mill for HRC60 steel, especially in finishing and semi-finishing operations.

Key structural advantages include:

A 4-flute geometry that increases overall tool rigidity
Reduced tool deflection during side milling and contouring
Stable cutting performance in deep or complex mold cavities
Lower vibration under high cutting loads

In high-hardness machining above HRC60, weak rigidity often leads to edge chipping or sudden tool failure. The SAMHO 4-flute structure reduces this risk and maintains a more controlled cutting path.

Improved Wear Resistance for Continuous Mold Steel Machining

Tool wear is a critical issue in hardened steel machining. Common failure modes include flank wear, edge chipping, and thermal fatigue.

The SAMHO 4 flute carbide design addresses these challenges through:

Balanced cutting load distribution across four flutes
High-performance coatings for heat and oxidation resistance
Reduced micro-vibration during long machining cycles

As a result, this tool delivers:

Longer and more stable tool life in continuous production
Reduced tool change frequency
Higher machine utilization and lower downtime

This makes it a reliable 4 flute carbide end mill for steel in demanding industrial environments.

Optimized for Mold Finishing and Precision Machining Applications

In real production environments, this tool is widely used as a flat end mill for mold steel machining, especially in precision mold manufacturing.

Typical applications include:

Semi-finishing and finishing of mold cavities
Side milling of vertical walls and stepped surfaces
High-speed contour finishing on CNC machining centers
Stable material removal with controlled depth of cut

Compared with lower flute-count tools, the 4-flute design provides better surface consistency and improved dimensional stability.

It is also commonly used as a CNC mold finishing carbide end mill in high-precision toolpaths where surface quality is critical.

Manufacturing Consistency and Engineering Support from SAMHO

From a global B2B procurement perspective, SAMHO is recognized as a stable precision square end mill supplier China, supporting both standard and customized tooling solutions.

Key manufacturing and supply advantages include: