Twist Drills for Mild Steel and Stainless Steel-Changzhou Maiteng Tools Co.,Ltd.

• First choice for drilling soft steel and stainless steel.
• Sharp cutting edge, avoids the formation of built-up edge, suitable for high-performance drilling.
• Straight shank/bevel shank type, internal/external cooling type optional.

NNZB Series Fried Dough Twists Drill (Internal Cooling Type)(3D/5D)

Processed Materials	Mild Steel HB≤180		Carbon Steel, Alloy Steel ~30HRC		Stainless Steel
Processed Materials	Mild Steel HB≤180		Carbon Steel, Alloy Steel ~30HRC		Austenitic Series		Martensitic Series		Ferrite Series
Cutting Speed	80~150m/min		80~150m/min		40-80 m/min		50-100 m/min		60~120 m/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)
3	12700	0.09~0.12	12700	0.09~0.12	6300	0.03~0.07	7400	0.03~0.07	9000	0.03~0.07
4	9600	0.10~0.15	9600	0.10~0.15	4700	0.04~0.08	5600	0.04~0.08	6700	0.04~0.08
5	7600	0.12~0.18	7600	0.12~0.18	3800	0.05~0.10	4500	0.05~0.10	5400	0.05~0.10
6	6400	0.14~0.20	6400	0.14~0.20	3200	0.06~0.12	3700	0.06~0.12	4500	0.06~0.12
8	4800	0.16~0.24	4800	0.16~0.24	2400	0.08~0.16	2800	0.08~0.16	3400	0.08~0.16
10	3800	0.18~0.27	3800	0.18~0.27	1900	0.10~0.18	2200	0.10~0.18	2700	0.10~0.18
12	3200	0.20~0.30	3200	0.20~0.30	1600	0.12~0.20	1900	0.12~0.20	2300	0.12~0.20
14	2700	022~0.35	2700	0.22~0.35	1350	0.13~0.22	1600	0.13~0.22	1900	0.13~0.22
16	2400	0.25~0.36	2400	0.25~0.36	1200	0.14~0.25	1400	0.14~0.25	1700	0.14~0.25
18	2100	0.28~0.38	2100	0.28~0.38	1050	0.15~0.28	1200	0.15~0.28	1500	0.15~0.28
20	1900	0.30~0.40	1900	0.30~0.40	950	0.16~0.30	1100	0.16~0.30	1350	0.16~0.30

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.
4. The cutting conditions in this table are applicable to situations where the hole depth is below 5D.

The NNZB Twist Drills features both internal and external cooling options, along with straight and tapered shanks to accommodate different clamping requirements. The specially designed cutting edge is sharp yet stable, reducing cutting resistance and minimizing built-up edge formation, making it ideal for high-performance drilling. The optimized 140° point angle ensures smooth penetration for efficient drilling.

Manufactured with high-precision processes, NNZB offers excellent wear resistance and long service life. The improved flute structure enhances chip evacuation, reducing heat buildup and ensuring stable machining. The surface treatment further improves corrosion resistance, ensuring consistent performance even under demanding working conditions.

A wide range of size combinations is available, covering various diameters and lengths to meet diverse drilling needs. Whether standard dimensions or custom requirements, NNZB offers flexible options for seamless integration with different machines and workpiece materials.

NNZB is highly suitable for efficient machining of mild steel (HB<180) and stainless steel, while also being compatible with carbon steel, alloy steel, and heat-resistant alloys, making it an adaptable solution for various industrial applications.

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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