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Product details

Insoul DIN340 HSS Twist Drill Bits – Precision Engineered for Reliable Metal Drilling

Superior Material Composition for Extended Tool Life

Insoul DIN340 twist drill bits are precision-crafted from premium high-speed steel, available in HSS4341, M2, and M35 grades to suit various machining requirements and budgets. All models undergo rigorous hardening to achieve a consistent Rockwell hardness rating of HRC 62-65, ensuring the cutting edge maintains its integrity throughout demanding operations.

The M35 grade variants incorporate a precise 5% cobalt addition into the steel matrix, which substantially elevates the material's red hardness and wear resistance. This cobalt-enriched composition allows the drill bits to withstand higher cutting temperatures without softening, making them particularly effective for challenging applications. For general-purpose drilling where cost efficiency is paramount, the M2 grade delivers reliable basic cutting performance with excellent value. Every drill bit, regardless of grade, undergoes an integrated heat treatment process involving quenching followed by multiple tempering cycles. This meticulous thermal processing ensures uniform hardness distribution throughout the drill body, striking an optimal balance between a keen, penetrating edge and the toughness required to resist chipping under load.

Optimized Geometry for Clean, Accurate Holes

The cutting geometry of Insoul DIN340 drill bits is engineered for precision and efficiency. Featuring a standard 118° point angle suitable for a wide range of materials, the bits are also available with a 135° split-point configuration specifically designed for hard metals to prevent walking and ensure immediate engagement. A carefully calculated 30° helix angle works in conjunction with an 8° clearance angle to facilitate smooth chip flow and reduce friction during penetration.

Each cutting edge is precision-ground and subsequently honed to achieve exceptional sharpness. This meticulous edge preparation minimizes cutting resistance, allowing the drill to start cleanly without slipping or skidding across the workpiece surface. The result is burr-free holes from the very first revolution. Additionally, the chisel edge is strategically thinned to lower axial thrust requirements. This refinement enhances centering accuracy, enabling the drill to follow its intended path precisely and produce straight, well-positioned holes without wandering.

Consistent Cutting Performance Across Diverse Materials

Insoul DIN340 HSS twist drill bits are designed for sustained productivity. In continuous-use applications on common workpieces such as mild steel, aluminum alloys, copper, plastics, and wood, these bits maintain stable cutting performance for over 100 hours of operation. The cobalt-infused M35 models demonstrate particularly impressive sharpness retention, performing effectively even when drilling low-carbon stainless steel sheets up to 2mm in thickness. In such applications, their wear resistance measures approximately 1.5 to 2 times greater than that of ordinary carbon steel drills, translating to fewer tool changes and consistent hole quality over extended production runs.

Technical Specifications

Specification	Detail
Material / Grade	High-Speed Steel (HSS)
Point Angle	135° Split Point (Standard). Optimized for immediate bite and reduced walking on hard metals.
Flute Type	Spiral Flute Design for efficient chip evacuation.
Surface Treatment	Bright Finish (Standard) or Optional TiN/TiAlN Coating for enhanced lubricity and life.
Shank Type	Straight Round Shank (3mm - 20mm). Also available in Hex Shank for specific models.
Tolerance	Fully Ground to h8/h9 standards for high dimensional accuracy.
Size Range	Extensive range from 0.5mm to 20.0mm (1/64" to 1/2") diameter.

Product Features & Advantages

Core Material Science: The Cobalt Advantage

Unlike standard HSS drills (like M2), our bits are formulated with a significant cobalt infusion. This alloying element fundamentally increases the steel's hot hardness (red hardness), allowing the cutting edge to retain its temper and sharpness under intense frictional heat generated when drilling tough materials.

Engineered for Peak Performance

Exceptional Heat & Wear Resistance: Performs reliably in continuous high-temperature drilling scenarios, outlasting ordinary HSS drills by 2-5 times.
Superior Edge Strength: The cobalt-enhanced matrix provides high resistance to chipping and deformation, even under heavy feed pressure.
Reduced Material Adhesion: The material's property minimizes "built-up edge" (BUE) when machining gummy materials like stainless steel or certain alloys, ensuring cleaner holes and smoother operation.
Precision Ground Flutes & Point: Each bit undergoes full (full grinding process) for optimal dimensional accuracy (h8/h9), superior surface finish on the hole, and consistent point geometry for immediate penetration.

Product Images

Application Scenarios

Insoul Cobalt Drill Bits are the go-to choice for professionals working with demanding materials across various industries.

Primary Material Applications:

Stainless Steel: Ideal for grades 304, 316, 410, etc. Commonly used in food processing equipment, architectural fabrication, and marine applications.
High-Temperature Alloys & Titanium: Essential in aerospace, automotive (turbo components), and energy sectors.
High-Strength/Alloy Steel: Perfect for machining hardened steel, forgings, and high-tensile structural components.
Cast Iron & Non-Ferrous Metals: Provides excellent life and finish in cast iron, bronze, and brass.

Industry-Specific Use Cases:

Metal Fabrication Shops: For drilling clean, precise holes in stainless steel sheets and frames.

Machine Shops & Toolrooms: For maintenance, repair, and prototyping on a wide range of hard metals.

Automotive & Motorsport: Drilling into suspension components, engine parts, or exhaust fittings.

HVAC & Plumbing: Installing systems that require drilling into various metal ducts and pipes.

Why Choose Insoul Tools?

Our 22+ years of expertise and investment in over 100 advanced CNC machines translate into unparalleled consistency. Every batch undergoes strict quality control, ensuring each Insoul cobalt drill bit meets the high standards that differentiate our own brand from generic alternatives. This commitment is also evident in our hammer drill bits designed for impact drilling.

Frequently Asked Questions (FAQ)

Q1: Are you a factory or trading company?
A: We are 22 years+ professional manufacturer in drill bit tools industry.Welcome to visit our company.We guarantee our products are factory price, very cheap and competitive.
Q2: Do you provides sample?ls it free or extra?
A: Yes.We could offer the samples for free charge but do not pay the cost of freight.
Q3: why your price is higher than other company?
A: Because we are doing our own brand:the quality of the products is absolutely guaranteed.