Mte Hss DIN 338 Drill Bit Cylindrical Shank Short Rolled Type 7.5 mm

Mte Hss DIN 338 Drill Bit Cylindrical Shank Short Roll Forged Type 7.5 mm

Short Series, Roll Forged Type, Economical Solution for General Purpose Drilling and Pre-Drilling for M8 Thread

Mte HSS DIN 338 Drill Bit (7.5 mm) Short Series, Roll Forged Type is an economical and versatile cutting tool designed for everyday drilling tasks. This drill bit is commonly used in soft steels, aluminum, brass, plastics, and other standard machinable materials. The 7.5 mm diameter is critically important as it is the pre-drilling diameter that minimizes tap load for M8 metric standard threads or can be used as a clearance hole for M7/M8 bolts.

The product's main strength comes from its HSS (High-Speed Steel) material and especially its Roll Forged manufacturing method. Roll forged bits are tougher and more economical than ground bits, making them ideal for general-purpose and high-volume drilling jobs.

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)	7.5 mm
Standard	DIN 338: German standard for twist drill bits with cylindrical shanks and standard short length.
Production Method	Roll 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 (Roll forged bits typically have a black oxide finish).
Shank Type	Cylindrical Shank: Compatible with standard drill chucks.
Point Angle (Approximate)	Generally 118° point angle. (Roll forged bits typically have a more basic geometry compared to ground bits).
Cutting Direction	Right Hand Cutting

Application Areas and Industries Used

This drill bit is particularly used in applications requiring M8 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 M8 metric threads (for standard 1.25 mm thread pitch). While 6.8 mm is ideal, 7.5 mm minimizes the load on the tap, reducing the risk of tap breakage.

Plumbing and Pipelines: Drilling medium-sized connection and clearance holes (comfortable clearance hole for M7 or M8 bolts).

Automotive and Sub-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 7.5 mm diameter drill bit:

Tap Safety for M8 Threads: Although 6.8 mm is the ideal pre-drill size for M8 (1.25 mm pitch) threads, using a 7.5 mm diameter further reduces thread engagement. This almost eliminates the risk of tap breakage, especially in hard materials or when tapping by hand (requires sacrificing thread strength).

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

Cost-Effectiveness: Roll forged 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 and medium-hard metals, plastics, and wood.

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