Deep Hole Drills Twist Drill Bits-Changzhou Maiteng Tools Co.,Ltd.

• Suitable for efficient drilling of various materials such as steel, cast iron, stainless steel, etc.
• Straight shank twist drill with internal/external cooling.

NNSK Series Deep Hole Fried Dough Twists Drill (Internal Cooling Type)(12D)

Processed Materials	Mild Steel HB≤180		Carbon Steel, Alloy Steel ~30HRC		Prehardened Steel ~40HRC		Stainless Steel		Cast Iron		Nodular Cast Iron		Aluminum Alloy		Heat-Resisting Alloy
Cutting Speed	60~120m/min		60~120m/min		50~80m/min		40~60m/min		80~150m/min		60~120m/min		100~180m/min		10~20m/min
Diameter (mm)	Rotational Speed (min^-1)	Feed Rate (mm/r)	Rotational Speed (min^-1)	Feed Rate (mm/r)	Rotational Speed (min^-1)	Feed Rate (mm/r)	Rotational Speed (min^-1)	Feed Rate (mm/r)	Rotational Speed (min^-1)	Feed Rate (mm/r)	Rotational Speed (min^-1)	Feed Rate (mm/r)	Rotational Speed (min^-1)	Feed Rate (mm/r)	Rotational Speed (min^-1)	Feed Rate (mm/r)
3	10600	0.06~0.1	10600	0.06~0.1	7400	0.06~0.1	5300	0.03~0.07	12700	0.06~0.1	9500	0.06~0.1	15000	0.09~0.12	2100	0.03~0.06
4	8000	0.08~0.12	8000	0.08~0.12	5600	0.08~0.12	4000	0.04~0.08	96000	0.08~0.12	7000	0.08~0.12	11000	0.10~0.15	1600	0.04~0.07
5	6400	0.10~0.14	6400	0.10~0.14	4500	0.10~0.14	3200	0.05~0.10	7600	0.10~0.14	5700	0.10~0.14	9000	0.10~0.15	1250	0.05~0.9
6	5300	0.11~0.16	5300	0.11~0.16	3700	0.11~0.16	2700	0.06~0.12	6400	0.11~0.16	4700	0.11~0.16	7400	0.11~0.16	1050	0.06~0.11
8	4000	0.13~0.19	4000	0.13~0.19	2800	0.13~0.19	2000	0.08~0.16	4800	0.13~0.19	3600	0.13~0.19	5600	0.13~0.19	800	0.08~0.14
10	3200	0.14~0.22	3200	0.14~0.22	2200	0.14~0.22	1600	0.10~0.18	3800	0.14~0.22	2800	0.14~0.22	4500	0.14~0.22	600	0.10~0.16
12	2700	0.16~0.24	2700	0.16~0.24	1900	0.16~0.24	1300	0.12~0.20	3200	0.16~0.24	2400	0.16~0.24	3700	0.16~0.24	500	0.12~0.18
14	2300	0.18~0.28	2300	0.18~0.28	1600	0.18~0.28	1100	0.13~0.22	2700	0.18~0.28	2100	0.18~0.28	3200	0.18~0.28	450	0.13~0.20
16	2100	0.20~0.30	2100	0.20~0.30	1400	0.20~0.30	1050	0.14~0.25	2100	0.20~0.30	1800	0.20~0.30	2800	0.25~0.36	400	0.14~0.23
18	1800	0.22~0.32	1800	0.22~0.32	1200	0.22~0.32	950	0.15~0.28	1800	0.22~0.32	1600	0.22~0.32	2500	0.28~0.38	350	0.15~0.25
20	1600	0.25~0.35	1600	0.25~0.35	1100	0.25~0.35	800	0.16~0.30	1600	0.25~0.35	1400	0.25~0.35	2300	0.30~0.40	320	0.16~0.28

NNSK Series Deep Hole Fried Dough Twists Drill (Internal Cooling Type)(20D/30D)

Processed Materials	Mild Steel HB≤180		Carbon Steel, Alloy Steel ~30HRC		Prehardened Steel ~40HRC		Stainless Steel		Cast Iron		Nodular Cast Iron		Aluminum Alloy		Heat-Resisting Alloy
Cutting Speed	70~90m/min		50~80m/min		40~60m/min		40~60m/min		50~80m/min		60~80m/min		100~180m/min		8~15m/min
Diameter (mm)	Rotational Speed (min^-1)	Feed Rate (mm/r)	Rotational Speed (min^-1)	Feed Rate (mm/r)	Rotational Speed (min^-1)	Feed Rate (mm/r)	Rotational Speed (min^-1)	Feed Rate (mm/r)	Rotational Speed (min^-1)	Feed Rate (mm/r)	Rotational Speed (min^-1)	Feed Rate (mm/r)	Rotational Speed (min^-1)	Feed Rate (mm/r)	Rotational Speed (min^-1)	Feed Rate (mm/r)
3	8250	0.06~0.1	7650	0.06~0.1	5200	0.06~0.1	4750	0.03~0.07	7100	0.06~0.1	7600	0.06~0.1	12750	0.09~0.12	1350	0.03~0.06
4	6250	0.08~0.12	5750	0.08~0.12	3900	0.08~0.12	3600	0.04~0.08	5400	0.08~0.12	5600	0.08~0.12	9350	0.10~0.15	1050	0.04~0.07
5	5000	0.10~0.14	4600	0.10~0.14	3150	0.10~0.14	2900	0.05~0.10	4250	0.10~0.14	4550	0.10~0.14	7650	0.10~0.15	800	0.05~0.09
6	4150	0.11~0.16	3800	0.11~0.16	2600	0.11~0.16	2450	0.06~0.12	3600	0.11~0.16	3750	0.11~0.16	6300	0.11~0.16	700	0.06~0.11
8	3100	0.13~0.19	2900	0.13~0.19	1950	0.13~0.19	1800	0.08~0.16	2700	0.13~0.19	2900	0.13~0.19	4750	0.13~0.19	500	0.08~0.14
10	2500	0.14~0.22	2300	0.14~0.22	1550	0.14~0.22	1450	0.10~0.18	2150	0.14~0.22	2250	0.14~0.22	3850	0.14~0.22	400	0.10~0.16
12	2100	0.16~0.24	1950	0.16~0.24	1350	0.16~0.24	1150	0.12~0.20	1800	0.16~0.24	1900	0.16~0.24	3150	0.16~0.24	350	0.12~0.18
14	1800	0.18~0.28	1650	0.18~0.28	1100	0.18~0.28	1000	0.13~0.22	1500	0.18~0.28	1700	0.18~0.28	2700	0.18~0.28	300	0.13~0.20

1. When using this tool for the first time, test cutting at 90% of the cutting speed or 85% of the feed rate according to the above data. When the cutting condition is stable, increase the cutting speed and feed rate one by one.
2. This standard cutting condition table is applicable to water-soluble cutting fluids.
3. When installing the cutting tool, please use a defect free and clean chuck, and control the radial runout of the drill bit within 0.02mm.

The NNSK deep hole drills twist drill bits feature an internal cooling design that significantly enhances chip evacuation, ensuring stable long-term machining. The optimized drill bit structure offers multiple depth-to-diameter ratios, including 12D, 20D, and 30D, to meet various deep hole drilling requirements. The precisely engineered tip angles improve drilling efficiency, reduce cutting resistance, and enhance overall machining accuracy.

Manufactured with high-performance materials and advanced coating technology, these drill bits exhibit superior wear resistance and heat resistance, extending tool life. Precision grinding ensures a sharp cutting edge, reducing cutting force and improving surface finish quality. Additionally, the reinforced drill body enhances rigidity, ensuring stability even under high-intensity machining conditions, thereby minimizing tool breakage risks.

A wide range of diameter and length combinations are available, catering to various deep hole drilling scenarios. From standard sizes to custom models, users can flexibly select options to match specific workpiece requirements. Whether for mass production or specialized machining applications, the NNSK deep hole drills provide professional-grade solutions.

These drill bits are well-suited for machining materials such as soft steel (HB<180), stainless steel, cast iron, ductile iron, and heat-resistant alloys. Notably, they perform exceptionally well in cast iron and ductile iron applications, ensuring high-efficiency, high-precision drilling operations.

Changzhou Maiteng Tools Co.,Ltd.is located in the economically developed Yangtze River Delta region.The factory is located in XixiashuHigh-tech Development Zone,a well-known tool town in China.It is adjacent to S239 and Jiangyi Expressway in the east,25kilometers away from Changzhou North Station of the high-speed railway, and G42 Shanghai-Nanjing in the south.High-speed,8 kilometers away from Changzhou Benniu International Airport,the transportation is very convenient.
Magotantools take the ISO9001 quality system as the standard,under the guidanceof the business philosophy of"zero defect in products"and"zero distance in service",based on the spirit of"integrity","unity"and"exploita- tion",and follow a fair and just company style for management.Product production adopts five-axisand six-axis CNC grinding and machining centers from Germany,Switzerland,Japan,etc.,and is equipped with high-preci- sion testing equipment such as Germany,Japan,and China,so as to meet the needs of production with high quality and quantity.
The company's team consists of 2 professor-level senior engineers in China,and has more than ten experienced tool technology and R&D personnel.It has formed a long-term cooperation model with East China University of Science and Technology,and continuously develops various high-performance CNC tools,and has won various national awards.More than 10 patents,the company's products are mainly used in the defense industry, aerospace industry,automotive industry,electronic products and molds and other fields.
The company's various products are recognized and favored by well-known domestic companies.With infinite technology,infinite creation,and pursuit of excellence,Magotan tools will write future prosperity and dreams with more extraordinary confidence and high-quality quality.

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