Your Professional Drill Bit Supplier
Danyang GM Tools Co., Ltd., located in Danyang City, Jiangsu Province, China, is a professional manufacturer of precision cutting tools. Our modern 8,000 m² factory is equipped with advanced CNC machines, precision grinders, and heat-treatment equipment. Our experienced team of engineers, production staff, and quality inspectors ensures high-quality manufacturing and strict quality control. We specialize in standard and customized twist drills, power tools, saws, and hand tools for industrial applications such as metalworking, machinery, automotive, and mold making. With an overseas plant in Malaysia, we support global customers by reducing import costs and ensuring timely delivery. We are committed to reliable, long-term partnerships.
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![13PCS HSS Fully Ground Twist Drill Bit Set]()
13PCS HSS Fully Ground Twist Drill Bit SetName: 13PCS HSS fully ground twist drill bit setview more
Material: this is 13PCS HSS fully ground twist drill bit set made by HSS-M2 material (6542), we also have other material for you choose, such as 4241, 4341 and M35.... -
![5PCS HSS Cobalt Twist Drill Bit Set]()
5PCS HSS Cobalt Twist Drill Bit SetName: 5PCS HSS Turbo max Point cobalt twist drill bit setview more
Material: HSS-M35 material, other HSS 4241, 4341 and M2 can be choose.
Production technology: this 5PCS HSS cobalt twist drill bit set made by fully ground... -
![19PCS HSS Titanium Coated Twist Drill Bit Set]()
19PCS HSS Titanium Coated Twist Drill Bit SetName: 19PCS HSS titanium coated twist drill bit setview more
Material: HSS-4241 material, we also have other material for you choose, such as 4341, M2 and M35.
Production technology: half ground, edge ground
Tip degree: 118°... -
![19PCS HSS M35 Twist Drill Bit Set]()
19PCS HSS M35 Twist Drill Bit SetName: 19PCS HSS M35 Cobalt 5% twist drill bit setview more
Material: 19PCS HSS M35 twist drill bit set made by HSS-M35 material which included cobalt about 5%, so we also called cobalt drill, we also have other material for you choose,... -
![25PCS Tin-coated Metric Twist Drill Bit Set]()
25PCS Tin-coated Metric Twist Drill Bit SetName: 25PCS Tin-coated metric twist drill bit set packed by metal box with windowview more
Material: HSS-4241 material, we also have other material for you choose, such as 4341, M2 and M35.
Production technology: 25PCS Tin-coated... -
![25PCS HSS CO Twist Drill Bit Set]()
25PCS HSS CO Twist Drill Bit SetName: 25PCS HSS M35 Cobalt 5% twist drill bit set with red plastic box with windowview more
Material: HSS-M35 material, we also have other material for you choose, such as HSS 4241, HSS 4341 and HSS M2(6542).
Production technology:... -
![99PCS HSS Tin Coated Half Ground Twist Drill Bit Set]()
99PCS HSS Tin Coated Half Ground Twist Drill Bit SetName: 99PCS HSS tin coated edge ground half ground twist drill bit set packed into plastic boxview more
Material: 99PCS HSS tin coated half ground twist drill bit set made by HSS-4241 material, we also have other material for you choose,... -
![115PCS Cobalt Amber Finish Twist Drill Bit Set]()
115PCS Cobalt Amber Finish Twist Drill Bit SetName: 115PCS HSS M35 Cobalt 5% twist drill bit set with metal boxview more
Material: 115PCS cobalt amber finish twist drill bit set made of HSS-M35 material, we also have other material for you choose, such as HSS 4241,HSS 4341 and HSS... -
![DIN338 HSS Twist Drill Bit]()
DIN338 HSS Twist Drill BitName: DIN338 HSS twist drill bitview more
Material: HSS 4241, HSS 4341, HSS M2(6542) and M35.
Production technology: roll forged, or half ground(edge ground), or fully ground
Tip degree: 118 degree without split point or 135... -
![3PCS HSS Black and White Finish Step Drill Bit Set]()
3PCS HSS Black and White Finish Step Drill Bit SetName: 3PCS HSS black and white finish step drill bit setview more
Material: HSS 4241, HSS 4341, HSS M2(6542) and M35 for choose.
Flute: double straight flute.
Tip degree: 135 degree with split point
Surface treatment:... -
![3PCS HSS Nitriding Sprial Flute Step Drill Bit Set]()
3PCS HSS Nitriding Sprial Flute Step Drill Bit SetName: 3PCS HSS nitriding sprial flute step drill bit setview more
Material: HSS 4241, HSS 4341, HSS M2(6542) and M35 for choose. This is M35 material.
Flute: double spiral flute.
Tip degree: 135 degree with split point... -
![5PCS HSS 4241 Material Step Drill Bit Set]()
5PCS HSS 4241 Material Step Drill Bit SetName: 5PCS HSS 4241 material step drill bit setview more
Material: HSS 4241, HSS 4341, HSS M2(6542) and M35 for choose. This is HSS 4241 material.
Flute: double straight flute. You also can choose spiral flute
Tip degree:...
Why Choose Us
Sales Market
Our products are exported to numerous regions—including the Americas, Europe, the Middle East, and Asia—where they have garnered widespread acclaim.
Our Certificate
ISO 9001, CE, and RoHS certified, with 100% quality guarantee and strict quality control processes.
OEM/ODM Capability
Customized solutions provided quickly by our dedicated engineering team according to client specifications.
Quality Assurance
We provide a 100% quality guarantee to our customers. Any quality issues are fully our responsibility, ensuring reliable and worry-free products.
DIN338 HSS Twist Drill Bit
DIN338 HSS Twist Drill Bit is a tool for drilling round holes in workpiece by means of rotary cutting with relative fixed axis. It is named for its flute like spiral shape. Spiral grooves have 2 grooves, 3 grooves or more, but 2 grooves are the most common. Twist drill can be used in manual and electric hand held drilling tools or drilling machines, milling machines, lathes and even machining centers. The drill bit material is generally high-speed tool steel or cemented carbide.
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Name |
DIN338 HSS twist drill bit |
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Material |
HSS 4241, HSS 4341, HSS M2(6542) and M35. |
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Production technology |
Roll forged, or half ground(edge ground), or fully ground |
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Tip degree |
118 degree without split point or 135 degree with split point |
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Surface treatment |
Black finish, titanium coating, white finish, black and gold and amber finish etc for choose; |
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DIN338 HSS twist drill bit Size |
Inches size from 1/64 to 3/4 by increment 1/64 inches; Metric size from 1.0 to 20mm by increment 0.1mm; |
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Mark |
Mark material, size and brand by stamping method or lasering. |
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Package |
5-10PCS per PVC bag or plastic tube or plastic box; or combination set packed in big box such as plastic box or metal box, without or with window. |
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Brand |
GMTOOL, We also accept custom customers' brand (OEM). |
Benefits of DIN338 HSS Twist Drill Bit
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Enhanced Durability
The titanium coating increases the drill bits’ lifespan by reducing wear and tear, allowing them to maintain sharpness for longer periods.
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Improved Heat Resistance
The heat generated during drilling can affect the performance of standard drill bits. HSS Titanium Twist Drill Bits can withstand higher temperatures, reducing the risk of deformation or failure.
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Versatile Applications
These drill bits are suitable for various materials, making them a versatile addition to any toolbox. They can be used in woodworking, metalworking, and plastic fabrication.
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Efficient Cutting
The twist design of the drill bits allows for efficient chip removal, which helps prevent clogging and improves overall drilling performance.
Types of DIN338 HSS Twist Drill Bit
Straight Shank HSS Twist Drill Bits: These are the most common type of twist drill bits, featuring a straight shank that fits into a standard chuck. They are typically used for drilling standard holes in a wide variety of materials.
Reduced Shank HSS Twist Drill Bits: These bits have a reduced shank diameter compared to the cutting portion, allowing them to be used in a wider range of chuck sizes. This feature makes them suitable for drilling larger holes using smaller chucks.
Cobalt HSS Twist Drill Bits: A variant of HSS, cobalt HSS drill bits are made with a higher percentage of cobalt, making them even more durable and heat-resistant. These bits are ideal for drilling through harder metals like stainless steel.
Black Oxide Coated HSS Twist Drill Bits: These drill bits are coated with a layer of black oxide, which provides additional protection against corrosion. The coating also reduces friction, improving the bit's overall longevity and cutting performance.
Step Drill Bits: These are specialty HSS bits designed to drill holes of varying diameters without the need for multiple bits. Step drill bits are often used in thin sheet metals and materials where multiple hole sizes are required.
Applications of DIN338 HSS Twist Drill Bit
Metalworking
HSS twist drill bits are commonly used for drilling through various metals, including mild steel, aluminum, and stainless steel. Their high heat resistance makes them particularly effective for drilling through tough materials.
Woodworking
While they are primarily used in metalworking, HSS twist drill bits are also suitable for drilling through softer materials like wood. Their sharp cutting edges allow for clean and precise holes, making them ideal for woodworking projects.
Plastic Drilling
HSS twist drill bits can also be used for drilling through plastics, offering smooth and clean cuts without cracking or damaging the material. Their versatility in this regard makes them a go-to tool for many manufacturing and prototyping tasks.
Automotive and Aerospace
In industries where precision and high durability are required, such as automotive and aerospace, HSS twist drill bits are used for drilling holes in metal parts and assemblies. The ability to withstand high speeds and temperatures makes them indispensable in these high-performance sectors.
General DIY and Home Improvement
HSS twist drill bits are a popular choice for DIY enthusiasts, as they can be used for various home improvement tasks such as installing screws, drilling holes for anchors, and working with different materials like wood, plastic, and metal.
Construction
In construction projects, these drill bits are used for drilling holes in concrete, steel beams, and other heavy-duty materials. Their robust construction allows them to stand up to the stress and friction associated with drilling in demanding conditions.
Detailed Steps in the DIN338 HSS Twist Drill Bit Manufacturing Process
Steel rods are cut to length to form the bit blank. Size depends on the intended diameter and shank type.
Three primary methods dominate:
Milling: Most common for diameters 2.5–70mm. Specialized form cutters carve spiral grooves, shaping flutes prior to heat treatment.
Rolling: Uses heated blanks and mechanical deformation. Reduces material consumption, increases production rate (up to 20x versus milling), but sacrifices geometric accuracy after heat treatment.
Grinding: State-of-the-art, used for diameters <15mm, delivers superior finish and tolerance. Post-heat treatment grinding minimizes distortion and provides sharp, accurate flutes.
Point angle and chisel edge geometry are set via CNC grinding, individualized for specific materials (118° for general, 135° for steel).
Drills are heated to 1200°C for austenitization, then rapidly quenched (oil, air, or salt bath). Tempering relieves internal stress, improves toughness, and refines the martensite microstructure.
Any warpage is corrected. Secondary grinding delivers final edge sharpness and precise size.
Drill bits may be coated with TiN, TiAlN, TiCN, or oxide to increase wear resistance, lower friction, and extend service life by up to 3x.
Bits are laser-marked with size, standard, and lot codes. Automated vision, profile inspection, and hardness testing ensure ISO or DIN compliance.
Customization Options
Diameter & Length
Any diameter from 0.2–25.0 mm with custom flute lengths, overall lengths, or reduced shanks available on request.
Surface Coating
Black oxide, TiN, TiAlN, tin, amber, rainbow, or bright polish — choose the finish that fits your material and brand.
Point & Helix
Custom point angles (90°–140°), split-point, helix types (N/H/W), and left-hand spiral options for any material.
Packaging & Branding
OEM labels, metal tins, blister cards, plastic tubes, or any custom packaging to match your retail or industrial needs.
Maintenance and Care
Cleaning
Proper maintenance of your HSS titanium twist drill bits DIN 338 can significantly extend their lifespan. After use, clean the bits to remove any debris or residue. A simple brush or cloth can suffice for this task.
Storage
Storing your drill bits correctly is essential for maintaining their sharpness and integrity. Use a dedicated storage case or rack to prevent them from getting damaged or dulled by contact with other tools.
Regular Inspection
Periodically inspect your drill bits for signs of wear or damage. If you notice any chipping or dullness, it may be time to sharpen or replace them. Keeping your tools in top condition ensures optimal performance when you need them.
FAQ
We're well-known as one of the leading drill bit manufacturers and suppliers in China, also support customized service. Please feel free to buy high quality drill bit made in China here from our factory. Contact us for free sample.
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