10 Best Cobalt Drill Bits For Hardened Steel for 2025

Rennie Tool Company

• HSS Cobalt 5% Jobber Drill Bit Drills Bits For stainless Hard Steels

Silverline

• M35 high speed steel with 5% cobalt for strength and wear resistance
• 135 degree split point prevents walkaround
• Fully ground with amber finish
• Manufactured to DIN338
• Always use cooling agent

Wrighteu

• Extremely Heat Resistant : twist drill bits Must be used and operated at 1500 RPM or greater for maximum efficiency. Straight shank allows for firmly holding and accurate centering, fit for standard drill chucks and regular round collet chucks
• No Center Punch Is Needed:The 135° Quick-Cut points are self-centering and penetrate quickly with less pressure. Twist drill bit kit Will not "walk" or "wander"
• Faster Cutting and Longer Life:Our Twist Drill Bit HSS are Manufactured from M35 cobalt steel, with molybdenum and cobalt added to creates a hardened alloy, measuring Rockwell hardness up to 67, for much faster cutting and extra longer life span, with up to 12 times when compared with an average HSS drill bit.
• Metal Cutting : Drilling Steel, Stainless Steel, Hard Metal and Iron.Particularly successful in cutting through hard metals such as hard metal ,stainless steel and cast iron, although they can be used for softer materials, too.
• Easy Usage And Store :The set includes 13pcs of M35 cobalt steel twist drill bits: 1.5mm, 2mm, 2.5mm, 3mm, 3.2mm, 3.5mm, 4mm, 4.5mm, 4.8mm, 5mm, 5.5mm, 6mm, 6.5mm,13Pcs Packed in a Plastic Bag For Easy Usage And Store

Milwaukee

• Thunderweb
• Metal
• Red Case

Bosch Professional

• HSS-Co Metal Drill Bit Cassettes
• Content: 19-piece ProBox metal drill bit set HSS-Co (cobalt alloy), DIN 338
• EAN: 3165140689786

Sealey

• Fully ground HSS with 5% cobalt mAKes these ideal for drilling extra hard materials
• 135 degrees split point tip enables bits to bite work piece quickly, reducing the need for centre mark
• Drills can be re-sharpened without affecting their performance
• Supplied in metal storage case
• Sizes: 1-10 mm in 0.5 mm increments

S&R

• High performance drill S&R Metal Drill set 13 pcs in a set of professional quality.KM-serie
• Use: Hard alloys and cast metals, steel, cast steel, especially hard materials,
• HSS COBALT, High-Speed-Steel alloyed with 5% cobalt,C-cut according to DIN 1412 135° increased lifespan
• Equipment: Hand and Stand drills.Set:1,5x2,0x2,5x3,0x3,2x3,5x4,0x4,5x4,8x5,0x5,5x6,0x6,5
• Special construction: polished, precision class h8, average length according to DIN 338

heller

• Includes: 2mm, 3mm, 4mm, 5mm, 6mm, 8mm Drills
• For a large number of drill holes in high-alloy steel and stainless steel
• Use of a special HSS steel with 5% cobalt
• High true-running accuracy to DIN 1414
• Split point and 135° point angle for optimum, extremely accurate starting

Heller Tools

• Unbeatable in high-alloy steel and stainless steel - the perfect solution for the most challenging drilling
• Made of special HSS steel with 5% cobalt for extremely long life
• Pinpoint centring thanks to split point grinding and 135° point angle

metabo

• Roll-forged version
• In metal case
• O 1 - 10 x 0. 5 mm; Suitable for drilling in steel