Mte Hss DIN 338 Drill Bit Cylindrical Shank Short Forged Type 7 mm

Mte Hss DIN 338 Drill Bit Cylindrical Shank Short Rolled Type 7 mm

Short Series, Rolled Type, Economical Solution for General Purpose Drilling and Pre-M8 Tapping

Mte HSS DIN 338 Drill Bit (7.0 mm) Short Series, Rolled Type is an economical and versatile cutting tool designed for everyday drilling tasks. This drill bit is commonly used, especially in mild steels, aluminum, brass, plastics, and other standard machinable materials. Its 7.0 mm diameter is critically important as it is the pre-tap hole diameter that significantly reduces the tap load for M8 metric standard threads or can be used as an ideal clearance hole for M6 bolts.

The product's fundamental strength comes from its HSS (High-Speed Steel) material and specifically from 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

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

Feature Name	Detailed Description
Diameter (Nominal)	7.0 mm
Standard	DIN 338: German standard for twist drills 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 cost.
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 generally have a more basic geometry compared to ground bits).
Direction of Cut	Right Hand Cut

Usage Areas and Industries Served

This drill bit is particularly used in applications requiring M8 thread preparation and general assembly holes:

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

Machine Manufacturing and Assembly: Pre-drilling for M8 metric threads (for standard 1.25 mm pitch). Although 6.8 mm is ideal, 7.0 mm reduces the load on the tap, minimizing the risk of tap breakage.

Plumbing and Pipelines: Drilling medium-diameter connection and clearance holes (comfortable clearance hole for M6 or M7 bolts).

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

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

User Information and Benefits

This product appeals to users looking for a budget-friendly, general-purpose, and reliable 7.0 mm drill bit:

Reduces Tap Breakage Risk: While 6.8 mm is the ideal pre-drill hole for M8 (1.25 mm pitch) threads, using a 7.0 mm diameter reduces thread engagement to around 70-75%. This minimizes the risk of tap breakage, especially when tapping is difficult or done by hand (requires lower torque).

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 vibration).

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

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

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