4241 regular HSS
A cost-sensitive choice for casual drilling in softer materials, wood, plastic, thin iron and aluminium.
Guide 02 · Customer Buying Guide
How to Choose HSS Twist Drills
A practical guide to help customers choose the right type, material and finish of HSS twist drill for each drilling application.
Application + material + drill typeStart with the job to be done, then compare the HSS material, manufacturing method and finish.
Buying Guide Video
Choose a drill programme with confidence
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Read the buying guide transcript
How do you choose HSS twist drill bits? Many broken or overheated drill tips are caused by choosing the wrong material. This guide compares 4241, M2 and M35, and explains when titanium coating is useful.
Grade 4241 regular HSS is budget-friendly. It is suitable for wood, plastic, thin iron and aluminium, but it can lose hardness quickly on stainless steel. It is often selected for DIY work, occasional drilling and large, cost-sensitive bulk purchases.
M2 fully ground HSS is a standard industrial grade. It performs well on carbon steel, cast iron, copper and aluminium. Short, intermittent drilling in thin stainless steel may be suitable, but continuous heavy cutting can create excessive heat. M2 is a practical choice for factories and repair shops seeking a balance between cost and durability.
M35 cobalt drill bits contain 5% cobalt throughout the steel body. They are designed to remain stable at high temperatures, resist heat and reduce tip chipping during demanding drilling. M35 is commonly considered for stainless steel, tempered carbon steel, die steel, alloy steel and thick cast iron, with the final choice confirmed by the application and sample testing.
Do not confuse titanium coating with cobalt. Titanium coating is a golden surface layer, often applied to M2 drills, that can reduce chip adhesion and improve surface wear resistance. M35 contains cobalt throughout the steel body and does not depend on a coating for its heat resistance.
The quick guide is: choose 4241 for casual soft-material work, Ti-coated M2 for regular steel processing where the finish is specified, and solid M35 cobalt for stainless steel and harder alloys. Send the material, sizes, finish, packaging and expected quantity when requesting a quotation.
Customer Selection Guide
Choose the right HSS twist drill for the job
M2 industrial HSS
A balanced option for regular work on carbon steel, cast iron, copper and aluminium.
M35 cobalt HSS
A heat-resistant choice for stainless steel and other demanding or continuous drilling applications.
Ground, forged or coated
Compare fully ground, roll forged and coated options according to accuracy, cutting conditions, finish and target use.
Customer Guide
How should customers choose among different HSS twist drills?
Start with the workpiece and drilling conditions. Then compare the material grade, manufacturing method and surface finish that best match the job.
- Choose 4241 for casual soft-material work and cost-sensitive bulk purchases.
- Choose M2 for regular industrial drilling where balanced cost and durability are required.
- Choose M35 cobalt for stainless steel, hard alloys and continuous high-heat drilling.
- Compare fully ground and roll forged options according to accuracy, cutting conditions and target use.
- Consider a titanium-coated option when the surface treatment matches the base material and application.
Confirm the remaining details after choosing the drill type
After choosing the suitable type, confirm the applicable standard, size range, point angle, finish, packaging and sample requirements with the supplier.
Use samples to validate the recommendation
Before a repeat order, approve the actual drill, finish, marking and package. This creates a common reference for purchasing, quality control and future production.
Frequently Asked Questions
HSS twist drill selection questions
Which HSS grade should I choose?
The correct grade depends on the workpiece, cutting conditions, expected service life and target price. Include the application in your RFQ so the specification can be reviewed instead of choosing by grade name alone.
What is the difference between roll forged and fully ground drills?
They are different manufacturing routes that can affect geometry, accuracy, surface and cost. The best choice depends on the application and the buyer's performance target.
What information is needed for OEM packaging?
Provide the brand name, logo, package type, language, barcode requirements, set configuration, carton information and estimated quantity.
Need help building your HSS drill range?
Share your target market and specifications. We can organize a practical product and packaging discussion.