Mte Hss Drill Bit DIN 338 Cylindrical Shank Short Fluted Type 4 mm

Mte HSS DIN 338 Drill Bit Cylindrical Shank Short Rolled Type 4 mm

Short Series, Rolled Type, Economical Solution for General Purpose Drilling and M5 Pre-tapping Use

Mte HSS DIN 338 Drill Bit (4.0 mm) Short Series, Rolled Type is an economical and versatile cutting tool designed for everyday drilling operations. This drill bit is commonly used in particular for soft steels, aluminum, brass, plastics, and other standard machinable materials. Its 4.0 mm diameter is critical because it is the pilot hole diameter that reduces the tap load for M5 metric standard threads, or it can be used as a general-purpose bolt clearance hole.

The product's main strength comes from its HSS (High-Speed Steel) material and specifically its Rolled Forged manufacturing method. Rolled bits are tougher, more economical, and more resistant to breakage, especially in handheld drills, compared to ground bits.

Technical Specifications and Material Details

The Mte Drill Bit has optimized features for general-purpose and economical drilling applications.

Feature Name	Detailed Description
Diameter (Nominal)	4.0 mm
Standard	DIN 338: German standard for twist drill bits with cylindrical shanks and standard short length.
Manufacturing Method	Rolled Forged: The bit is shaped by heating, forging, and rolling. This method imparts greater toughness and flexibility to the material while reducing production costs.
Material Type	HSS (High-Speed Steel): Offers high wear resistance and toughness. Does not contain cobalt (HSS-E).
Surface Treatment	Bright Black Oxide or bright finish (Rolled bits usually have a black oxide finish).
Shank Type	Cylindrical Shank: Compatible with standard drill chucks.
Point Angle (Estimated)	Typically 118° point angle. (Rolled bits usually have a more basic geometry compared to ground bits).
Cutting Direction	Right Hand Cutting

Areas of Use and Industries Used

This drill bit is particularly used in applications requiring M5 thread preparation and general assembly holes:

General Metal Fabrication: Drilling assembly holes in soft steel, aluminum, brass, and copper profiles.

Machine Manufacturing and Assembly: Pre-drilling for M5 threads (for standard 0.8 mm thread pitch). (While 4.2 mm is ideal, 4.0 mm can be preferred to reduce tap load).

Automotive and Sub-Industry: Drilling in bodywork, chassis, and light alloy parts.

Plumbing and Pipelines: Drilling small diameter connection holes in thin-walled pipes and profiles.

Hobby and DIY Projects: General-purpose drilling in home and hobby workshops.

User Information and Benefits

This product appeals to users looking for a budget-friendly, general-purpose, and reliable 4.0 mm diameter drill bit:

Safety in M5 Thread Applications: Although 4.2 mm is the ideal pilot hole for M5 (0.8 mm pitch) threads, when a 4.0 mm diameter is used, the thread fullness remains high (around 80-85%), and the tapping process requires less torque (especially reducing the risk of breakage during hand tapping).

High Toughness and Flexibility: Thanks to the rolled manufacturing method, these bits have high toughness. They are more resistant to breakage, especially when working with handheld drills (in applications with vibrations).

Cost-Effectiveness: Rolled bits are more affordable than higher-performance ground bits. This makes them an economical choice for high-volume drilling in standard materials.

Versatility: Can be used on a wide range of materials, including soft and medium-hard metals, plastics, and wood.

DIN 338 Standard Short Series: This is the most commonly used standard length, ensuring high rigidity (resistance to bending) and vibration-free operation.