Mte Hss DIN 338 Drill Bit Cylindrical Shank Short Ground Type 16.5 mm

Mte HSS DIN 338 Drill Bit Cylindrical Shank Short Ground Type 16.5 mm

Short Series, Ground Type, Solution for High Precision and Pre-M18 Threading

The Mte HSS DIN 338 Drill Bit (16.5 mm) Short Series, Ground Type, is a high-quality cutting tool designed for precise hole drilling operations. This drill bit is ideal for applications requiring high tolerance and excellent surface finish, especially in larger diameters. It features a sharper geometry and a more accurate diameter compared to roll-forged types. Its 16.5 mm diameter is critically important in heavy manufacturing and assembly as it is the pre-drill diameter that minimizes tap load for M18 metric standard threads (2.5 mm pitch).

The product's core strength comes from its HSS (High-Speed Steel) material and, specifically, its Ground manufacturing method. Ground drill bits offer higher precision, sharper cutting edges, and better chip evacuation compared to roll-forged bits.

Technical Specifications and Material Details

The Mte Drill Bit has optimized features for M18 threading pre-preparation and general-purpose drilling applications.

Feature Name	Detailed Description
Diameter (Nominal)	16.5 mm
Standard	DIN 338: German standard for twist drill bits with cylindrical shanks and standard short length.
Manufacturing Method	Ground: The drill bit is fully ground from solid steel. This ensures high precision, tighter tolerances, and an excellent surface finish.
Material Type	HSS (High-Speed Steel): Offers high wear resistance and toughness. Does not contain cobalt (Standard HSS).
Surface Treatment	Bright finish (typically).
Shank Type	Cylindrical Shank: The shank diameter for large-diameter drill bits is often reduced to 13 mm (Reduced Shank) or is fully 16.5 mm (May vary depending on machine capacity).
Point Angle (Estimated)	Generally 118° point angle. (Offers better centering and cutting performance due to its precise geometry).
Cutting Direction	Right-hand cutting

Usage Areas and Industries

This drill bit is used particularly in large-diameter applications requiring M18 threading pre-preparation and general assembly holes:

Machine Manufacturing and Assembly: Pre-drilling for M18 metric standard threads (for standard 2.5 mm thread pitch). While 15.5 mm is ideal, 16.5 mm minimizes the load on the tap, reducing the risk of tap breakage.

General Metal Fabrication: Drilling assembly holes in medium to thick section steel, stainless steel (low alloy), cast iron, and aluminum profiles.

Plumbing and Construction: Drilling in steel structures, pipelines, and flanges.

Mold and Tool Manufacturing: Pre-preparation for precise and large-diameter tapping operations, especially in situations where tap breakage is costly or manual tapping is performed.

M16 Bolt Clearance Hole: Can also be used as a loose clearance hole for M16 bolts.

User Information and Benefits

This product caters to users seeking high precision and reliable performance for M18 tapping operations:

Minimizing Tap Breakage Risk: While 15.5 mm is the ideal pre-drill for M18 (2.5 mm pitch) threads, using a 16.5 mm diameter significantly reduces thread engagement. This minimizes the risk of tap breakage, especially in hard materials or with machines without torque control (requires sacrificing some thread strength).

High Precision and Surface Finish: Thanks to the ground manufacturing method, the hole diameter and position are extremely precise. It provides a smoother surface finish for large-diameter holes.

Sharper Cutting Edges: Sharper cutting edges compared to roll-forged types require less cutting force and create cleaner holes.

Improved Chip Evacuation: Precisely ground flutes ensure efficient evacuation even with large chip volumes.

DIN 338 Short Series: The short design minimizes vibration and deflection, allowing for more stable drilling.