M35 grade HSS cobalt drill bits, fully ground from solid steel for precision and heat resistance. Ideal for stainless steel, alloys and hard metals. Manufactured to DIN 338. Available in a wide range of sizes from 1.0mm to 13.0mm.
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Available options and pricing for HSS-G COBALT Premium Ground Jobber Drill Bits, with quantity selectors and a running total
Size
QTY
SKU
Price
QTY
Total
1.0mm
10
HSSCO1
£10.07£12.08
—
1.5mm
10
HSSCO15
£9.64£11.57
—
2.0mm
10
HSSCO2
£8.51£10.21
—
2.5mm
10
HSSCO25
£8.62£10.34
—
3.0mm
10
HSSCO3
£9.41£11.29
—
3.2mm
10
HSSCO32
£10.07£12.08
—
3.3mm
10
HSSCO33
£10.15£12.18
—
3.5mm
10
HSSCO35
£10.63£12.76
—
4.0mm
10
HSSCO4
£11.53£13.84
—
4.2mm
10
HSSCO42
£12.81£15.37
—
4.5mm
10
HSSCO45
£13.40£16.08
—
4.8mm
10
HSSCO48
£14.66£17.59
—
5.0mm
10
HSSCO5
£14.02£16.82
—
5.5mm
10
HSSCO55
£18.43£22.12
—
6.0mm
10
HSSCO6
£17.83£21.40
—
6.5mm
10
HSSCO65
£20.72£24.86
—
6.8mm
10
HSSCO68
£21.92£26.30
—
7.0mm
10
HSSCO7
£21.92£26.30
—
7.5mm
5
HSSCO75
£12.05£14.46
—
8.0mm
5
HSSCO8
£13.69£16.43
—
8.5mm
5
HSSCO85
£15.23£18.28
—
9.0mm
5
HSSCO9
£15.97£19.16
—
9.5mm
5
HSSCO95
£18.19£21.83
—
10.0mm
5
HSSCO100
£19.65£23.58
—
10.2mm
5
HSSCO102
£24.57£29.48
—
10.5mm
5
HSSCO105
£26.06£31.27
—
11.0mm
5
HSSCO110
£26.67£32.00
—
11.5mm
5
HSSCO115
£29.72£35.66
—
12.0mm
5
HSSCO120
£31.69£38.03
—
12.5mm
5
HSSCO125
£35.34£42.41
—
13.0mm
5
HSSCO130
£38.30£45.96
—
1.0mm
1
HSSCOR1
£1.01£1.21
—
1.5mm
1
HSSCOR15
£1.04£1.25
—
2.0mm
1
HSSCOR2
£1.06£1.27
—
2.5mm
1
HSSCOR25
£1.10£1.32
—
3.0mm
1
HSSCOR3
£1.13£1.36
—
3.2mm
1
HSSCOR32
£1.21£1.45
—
3.3mm
1
HSSCOR33
£1.25£1.50
—
3.5mm
1
HSSCOR35
£1.34£1.61
—
4.0mm
1
HSSCOR4
£1.34£1.61
—
4.2mm
1
HSSCOR42
£1.43£1.72
—
4.5mm
1
HSSCOR45
£1.49£1.79
—
4.8mm
1
HSSCOR48
£1.59£1.91
—
5.0mm
1
HSSCOR5
£1.62£1.94
—
5.5mm
1
HSSCOR55
£1.96£2.35
—
6.0mm
1
HSSCOR6
£1.96£2.35
—
6.5mm
1
HSSCOR65
£2.22£2.66
—
7.0mm
1
HSSCOR7
£2.47£2.96
—
7.5mm
1
HSSCOR75
£2.72£3.26
—
8.0mm
1
HSSCOR8
£3.13£3.76
—
8.5mm
1
HSSCOR85
£3.63£4.36
—
9.0mm
1
HSSCOR9
£3.92£4.70
—
9.5mm
1
HSSCOR95
£3.52£4.22
—
10.0mm
1
HSSCOR100
£4.25£5.10
—
10.5mm
1
HSSCOR105
£4.98£5.98
—
11.0mm
1
HSSCOR110
£5.49£6.59
—
11.5mm
1
HSSCOR115
£6.66£7.99
—
12.0mm
1
HSSCOR120
£6.98£8.38
—
12.5mm
1
HSSCOR125
£8.19£9.83
—
13.0mm
1
HSSCOR130
£8.84£10.61
—
These cobalt HSS ground jobber drill bits are built for the jobs where a standard HSS bit gives up. Made from M35 alloyed high speed steel with 5% cobalt content, they handle stainless steel, hardened alloys and other tough metals that would blunt a cheaper bit before you’ve broken through. If you’ve ever watched an ordinary drill bit turn blue and skate across a piece of 316 stainless, you’ll understand exactly why cobalt matters.
The key difference here is in the manufacturing process. These bits are fully ground from solid bar stock, rather than being rolled or milled. That gives a cleaner cutting edge, tighter dimensional accuracy, and a finish that holds up under sustained pressure. Manufactured to DIN 338, they meet the dimensional standard that most professional metalworking applications expect, so they’ll seat correctly in chucks and jigs without any wobble or runout issues.
Where Cobalt HSS Ground Jobber Drill Bits Earn Their Keep
The 5% cobalt content isn’t just a marketing number. Cobalt raises the heat tolerance of the steel significantly, which is the real reason these bits outperform standard HSS on hard materials. When you’re drilling stainless or alloy steels, friction builds up fast. A standard bit softens at the tip, loses its edge, and suddenly you’re generating more heat than you’re cutting. The cobalt in M35 keeps the cutting geometry intact at much higher temperatures, so the bit stays sharp for longer and cuts cleanly rather than just work-hardening the material.
Available in sizes from 1.0mm right up to 13.0mm, including some of the less common increments like 3.2mm, 4.2mm, 4.8mm and 6.8mm that come up more often than you’d think on fabrication and engineering work. That kind of range means you can keep the sizes you actually need on the van rather than improvising with whatever’s closest.
Single bits, packs of five, or packs of ten depending on what your workflow calls for. Good bits used properly will last, but having spares when you’re deep into a stainless steel job is never a bad idea.
Pro Tip: When drilling stainless steel with cobalt bits, use a slow speed, firm consistent pressure, and a decent cutting fluid — stainless work-hardens quickly if you let the bit rub instead of cut, and no cobalt bit in the world recovers from that.
These cobalt HSS ground jobber drill bits are used wherever standard HSS drill bits struggle. That means stainless steel fabrication, marine engineering, structural steelwork involving alloy grades, and precision metalwork where dimensional accuracy matters. They're regularly used by metal fabricators, pipefitters, mechanical engineers, and maintenance teams working on plant and equipment where harder steel grades are common.
They're also well suited to general engineering workshops that need a reliable bit for mixed-metal drilling across stainless, mild steel and harder alloys in the same working day.
Best For
Stainless steel drilling
Hardened alloy steels
Precision metalwork
Fabrication and pipefitting
Engineering and maintenance work
Works With
Standard keyed and keyless drill chucks
Pillar drills and bench drills
Cordless and corded power drills
Magnetic drilling machines
Key Specifications
M35 alloyed high speed steel
5% cobalt content
Fully ground from solid bar
Manufactured to DIN 338
Sizes: 1.0mm to 13.0mm
Cylindrical shank
Not suitable for: Not intended for use on masonry, concrete, or wood — these are metalworking bits and need a suitable material and cutting fluid to perform correctly. Not recommended as a replacement for specialist carbide-tipped bits on the very hardest materials such as hardened tool steel.
Apply a cutting fluid or lubricant to the drill point and work surface before starting. Use a centre punch to mark your drill position — this stops the bit walking on smooth metal and saves the tip from unnecessary stress. Set your drill to a low to medium speed; cobalt bits cut best at steady, controlled feeds rather than high RPM.
Apply consistent downward pressure and keep the feed rate steady. If the bit starts squealing or the material begins to discolour, ease the pressure slightly and add more cutting fluid. On stainless steel especially, a continuous cut beats a stop-start approach — lifting the bit mid-hole allows the material to work-harden, which makes re-entry much harder. Clear swarf regularly on deeper holes to prevent binding.
Mark the drill position with a centre punch to prevent the bit wandering on entry
Select the correct bit size for your application and check it is seated securely in the chuck
Apply cutting fluid or oil to the drill point and the work surface
Set the drill to a low to medium speed appropriate for the material thickness and hardness
Begin drilling with firm, consistent pressure — avoid letting the bit rub without cutting
Add cutting fluid throughout the operation, particularly on stainless steel
Clear swarf regularly when drilling deeper holes to prevent the bit binding
Allow the bit to cool naturally between holes on prolonged use — do not quench in water
What is the difference between M35 cobalt HSS and standard HSS drill bits?
Standard HSS bits are fine for mild steel and general metalwork, but they lose their edge quickly on harder materials like stainless steel because they cannot handle the heat generated. M35 cobalt HSS contains 5% cobalt, which significantly increases heat resistance and keeps the cutting edge intact at higher temperatures. The result is a bit that stays sharper for longer on tough alloys and stainless grades.
Do I need cutting fluid when using these bits?
On stainless steel and harder alloys, yes — cutting fluid is strongly recommended. It reduces heat at the tip, extends bit life, and helps prevent the material from work-hardening during drilling. On mild steel you can often get away without it, but good habits with cutting fluid will always give better results and longer bit life regardless of the material.
Are these bits suitable for use in a standard cordless drill?
Yes, they have a standard cylindrical shank and will fit any keyed or keyless chuck. For best results on hard metals, use a drill with variable speed control so you can run at lower RPM. A pillar drill or bench drill gives the most control, but a corded or cordless hand drill works fine for most applications as long as you manage speed and feed pressure carefully.
Manufactured from M35 alloyed high speed steel, these bits contain 5% cobalt which raises the material's red hardness and resistance to thermal softening compared to standard M2 HSS. The bits are fully ground from solid bar stock rather than formed, which produces tighter tolerances and a more consistent cutting geometry. Manufactured to DIN 338, specifying jobber length proportions, cylindrical shank form, and point geometry.
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