DIN338 amber M35 cobalt high speed steel twist drill bits produced by Jiangsu WRD Tools Co., Ltd.

Automated CNC flute grinding facility for cobalt twist drill bits at WRD Tools

Comprehensive industrial cutting tool assortment manufactured by Jiangsu WRD Tools Co., Ltd.

Industrial core cutters and metal drilling solutions engineered for severe alloy machining

2007Founded

12,000 m²Factory Area

150+Employees

90MBits / Year

20+Export Countries

4.7/5Buyer Rating

<< Engineering Authority & Sourcing Guide >>

M35 Cobalt Twist Drill Bit: Why Engineering Teams & Global B2B Buyers Prioritize 5% Cobalt HSS-Co for Severe Work-Hardening Alloys

Industrial drilling in 304, 316 austenitic stainless steels, titanium alloys, and high-tensile structural metals presents a persistent operational challenge: rapid thermal degradation and edge blunting on conventional M2 tools. With 5% metallurgical cobalt and precise vacuum triple-tempering to HRC 65-67, the M35 Cobalt Twist Drill Bit preserves cutting-edge geometry at operating temperatures up to 600°C. Jiangsu WRD Tools Co., Ltd. delivers direct factory engineering, rigorous chemical compliance, and precision DIN-standard manufacturing for global distributors, hardware brands, and tier-one machining vendors.

<< Information Gain & Metallurgy >>

Metallurgical Deep-Dive & Physics of Red Hardness

Understanding why standard HSS M2 fails where HSS-Co M35 thrives: high cobalt dissolution prevents carbide agglomeration under intense friction and cyclic shear loads.

Chemical Composition Matrix

Cobalt (Co)	4.80% – 5.20% (Red hardness stabilizer)
Tungsten (W)	6.00% – 6.70% (Wear-resistant carbide former)
Molybdenum (Mo)	4.70% – 5.20% (Toughness & tempering retention)
Vanadium (V)	1.70% – 2.00% (Fine-grain primary carbide)
Chromium (Cr)	3.80% – 4.50% (Hardenability & oxidation defense)
Carbon (C)	0.88% – 0.96% (Martensitic hardness baseline)

Mechanical & Thermal Properties

Core Hardness	HRC 65.0 – 67.0 (Rockwell C scale)
Thermal Threshold	Maintains edge retention up to 600°C – 620°C
Point Geometry	135° Split Point (DIN 1412 Form C)
Flute Design	Type N parabolic web with mirror-finish grind
Surface Options	Amber/Bronze Oxide, TiN, TiAlN, AlTiN PVD
Manufacturing	Fully ground from solid bar (HSS-G)

Workpiece Application Guidance

Stainless Steel	AISI 304, 316, 316L, 321, Duplex 2205
Tool & Die Steels	H13, D2, P20, 4140, 4340 quenched & tempered
Superalloys	Inconel 625/718, Monel 400, Hastelloy C276
Titanium	Ti-6Al-4V Grade 5, Grade 2 Commercial Pure
Cast Iron	Nodular cast iron, chilled Meehanite castings
High-Tensile	Structural plate exceeding 900 N/mm² UTS

<< Product Portfolio >>

M35 Cobalt Twist Drill Bit Recommendations

Precision-manufactured configurations engineered for production plants, CNC machining centers, job shops, and high-turnover industrial distribution.

FLAGSHIP

DIN 338 M35 cobalt twist drill bit amber finish

DIN 338 M35 5% Co Straight Shank Jobber Bit

0.5mm – 13.0mm · 135° Split Point · Amber Oxide

US$0.09–0.15 / piece

MOQ: 500 pieces

HEX SHANK

1/4" Quick-Change Hex Shank M35 Drill Bit Set

12-Piece Impact Ready · Stainless & Alloy Plate

US$8.90–9.90 / set

MOQ: 1,200 sets

HEAVY DUTY

Industrial grade M35 cobalt drill bits boxed set

Industrial 19/25/29 PCS M35 Cobalt Index Box Set

1.0–13.0mm by 0.5mm · Metal Case · Laser Marked

US$0.90–1.90 / piece

MOQ: 500 pieces

SPECIALTY

Split point cobalt twist drill bits for thin sheet metal

Stub DIN 1897 M35 Cobalt Bit for Sheet Metal

Short Flute · Maximum Rigidity · Zero Walking

US$0.19–0.50 / piece

MOQ: 500 pieces

<< Market Intelligence >>

Future Procurement & Technology Trends

Emerging industrial shifts impacting supply chain strategy, alloy raw-material indexing, and precision drill bit procurement through 2030.

Global Procurement Dynamics: From Standard M2 to Premium Cobalt

Industrial procurement data indicates a steady 8.4% compound annual growth rate in demand for cobalt-bearing twist drill bits. As EV battery frames, hydrogen fuel valves, and offshore renewable structural weldments transition from standard mild steels to grade 316L, 1.4404 stainless, and duplex alloys, conventional HSS tooling causes frequent line stoppages. Modern supply chain managers are shifting their OEM stock assortments toward standardizing on M35 cobalt bits. This consolidation reduces SKU fragmentation while providing end users with a true dual-purpose bit suitable for carbon steel and refractory alloys alike.

Furthermore, ESG auditing and verifiable traceability are fundamentally restructuring supplier qualification. Buyers increasingly require raw-material spectroscopic certs to prevent the substitution of recycled scrap or substandard chemical compositions.

Technological Evolutions: Coatings, Geometries & Cold Forming

The M35 cobalt twist drill is no longer just a traditional amber-finished tool. At Jiangsu WRD Tools Co., Ltd., technology development focuses on three primary vectors:

Multi-layer PVD Nano-Coatings: AlTiN and TiSiN coatings increase surface micro-hardness up to 3300 HV, enabling high-speed dry and near-dry MQL (Minimum Quantity Lubrication) drilling.
Parabolic Chip Flute Profiles: Modified wide-valley web designs accelerate the evacuation of stringy stainless steel swarf, cutting frictional heat spikes by over 30%.
Robotic CNC 5-Axis Flute Grinding: Elimination of manual point variation guarantees drill runout within 0.02mm, ensuring predictable tool life on automated CNC gantries.

<< Manufacturing Excellence >>

Full-Spectrum Factory Infrastructure

How Jiangsu WRD Tools Co., Ltd. controls metallurgical fidelity, geometric concentricity, and high-volume delivery across our 12,000 m² Danyang facility.

Dedicated HSS and M35 cobalt drill bits grinding workshop — HSS & M35 Flute Grinding Workshop

High speed CNC drill bit production facility — CNC Precision 5-Axis Line

Automated drill bit packaging and private labeling line — Automated OEM Packaging Line

Jiangsu WRD Tools Co., Ltd. headquarters and plant in Danbei Town, Danyang

CNC fully ground drill bit manufacturing

Quality inspection laboratory at Jiangsu WRD Tools

<< Enterprise Advantages >>

Why Global Brands Source From Jiangsu WRD Tools Co., Ltd.

19Years of Dedicated Tool
Manufacturing & Engineering

Founded in March 2007 with a registered capital of RMB 10 million, Jiangsu WRD Tools Co., Ltd. operates a high-capacity 12,000 m² manufacturing plant located in Danbei Town, Danyang, Jiangsu. Operating 100% as a direct factory rather than a trading intermediary, we maintain dedicated workshops for HSS twist drills, annular cutters, and specialized wood tooling, powered by an expert workforce of over 150 toolmakers and quality engineers.

Our complete vertically-integrated process spans in-house bar stock shearing, computer-monitored salt-bath and vacuum heat treatment, continuous CNC fully-ground flute machining, surface treatment, optical runout testing, and automated packaging. In 2019, WRD was officially recognized as a High-Tech Enterprise of Jiangsu Province. With an annual output reaching 25 million twist drill bits, 15 million hex shank drills, and 50 million wood bits, our factory achieved over RMB 80 million in sales, exporting to premium markets including Germany, the United States, Switzerland, Sweden, and over 20 other countries.

25MTwist Drill Bits / Year

15MHex Shank Bits / Year

50MWood Boring Bits / Year

Our strict metallurgical consistency has made us a trusted OEM/ODM production source for international brands including BOSCH, Milwaukee, DeWalt, Irwin, Makita, Dexter, KWB, Wolfcraft, Truper, and Heller.

<< Procurement FAQ >>

M35 Sourcing & Engineering FAQ

Answers to common queries raised by tool distributors, OEM buyers, and supply chain managers.

How can procurement teams distinguish real M35 Cobalt from surface-treated M2 or 4241?

Authentic M35 contains 4.8% to 5.2% metallurgical Cobalt evenly distributed throughout the substrate alloy, not just on the exterior. Verified suppliers provide X-ray Fluorescence (XRF) spectrometry reports and Rockwell hardness test certificates confirming HRC 65-67 after triple tempering. Surface-colored carbon or lower HSS bits show hardness drops below HRC 63 and fail rapidly when subjected to work-hardening alloys like AISI 304.

What makes 135-degree split point geometry critical for M35 twist drill bits?

A standard 118-degree chisel edge tends to walk across work-hardened surfaces such as stainless steel and nickel alloys. The 135-degree self-centering split point geometry eliminates wandering, reduces required axial thrust pressure by up to 40%, and breaks chips into manageable segments to optimize chip extraction and thermal dissipation.

What are the recommended cutting speeds (SFM/RPM) and feeds for M35 drill bits in 304/316 stainless steel?

M35 requires a rigid setup with high feed and moderate cutting speed. For annealed austenitic stainless steel, surface speed should be maintained between 10 to 15 m/min (35-50 SFM). Inadequate feed leads to friction-induced work hardening; maintaining a constant chip load with active sulfurized cutting fluid or emulsion is critical to maximize bit longevity.

What is the standard OEM private label packaging process and MOQ for M35 Cobalt twist drill bits?

Jiangsu WRD Tools Co., Ltd. provides comprehensive OEM services including high-precision laser etching of brand logos and fractional/metric sizing on drill shanks. Packaging options include industrial plastic bulk tubes (MOQ 500 pcs per individual diameter), dual-blister retail display hanging cards, heavy-duty ABS indexing cassettes, and powder-coated steel cases (MOQ 1,200 sets for fully customized private label artwork).

How does heat treatment affect the red hardness of M35 drill bits during continuous drilling cycles?

During vacuum hardening at 1210-1230 degrees Celsius followed by three successive tempering cycles at 550-570 degrees Celsius, Cobalt solidifies the martensitic matrix. This prevents thermal softening at cutting zone temperatures exceeding 600 degrees Celsius, preserving edge sharpness up to 4 to 5 times longer than conventional M2 tool steel.